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mybatis 分页
一.首先配置下基础类
1.Dialect.java
package com.labway.portal.page;
/**
* 类似hibernate的Dialect,但只精简出分页部分
*
* @author badqiu
*/
public class Dialect {
public boolean supportsLimit() {
return false;
}
public boolean supportsLimitOffset() {
return supportsLimit();
}
/**
* 将sql变成分页sql语句,直接使用offset,limit的值作为占位符.</br> 源代码为:
* getLimitString(sql,offset
* ,String.valueOf(offset),limit,String.valueOf(limit))
*/
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset), limit,
Integer.toString(limit));
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符(placeholder)替换.
*
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @return 包含占位符的分页sql
*/
public String getLimitString(String sql, int offset,
String offsetPlaceholder, int limit, String limitPlaceholder) {
throw new UnsupportedOperationException("paged queries not supported");
}
}
2.MySql5Dialect.java
package com.labway.portal.page;
public class MySql5Dialect extends Dialect {
protected static final String SQL_END_DELIMITER = ";";
public String getLimitString(String sql, boolean hasOffset) {
return MySql5PageHepler.getLimitString(sql, -1, -1);
}
@Override
public String getLimitString(String sql, int offset, int limit) {
return MySql5PageHepler.getLimitString(sql, offset, limit);
}
@Override
public boolean supportsLimit() {
return true;
}
}
3.MySql5PageHepler.java
package com.labway.portal.page;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MySql5PageHepler {
/**
* 得到查询总数的sql
*/
public static String getCountString(String querySelect) {
querySelect = getLineSql(querySelect);
int orderIndex = getLastOrderInsertPoint(querySelect);
int formIndex = getAfterFormInsertPoint(querySelect);
String select = querySelect.substring(0, formIndex);
// 如果SELECT 中包含 DISTINCT 只能在外层包含COUNT
if (select.toLowerCase().indexOf("select distinct") != -1
|| querySelect.toLowerCase().indexOf("group by") != -1) {
return new StringBuffer(querySelect.length())
.append("select count(1) count from (")
.append(querySelect.substring(0, orderIndex))
.append(" ) t").toString();
} else {
return new StringBuffer(querySelect.length())
.append("select count(1) count ")
.append(querySelect.substring(formIndex, orderIndex))
.toString();
}
}
/**
* 得到最后一个Order By的插入点位置
*
* @return 返回最后一个Order By插入点的位置
*/
private static int getLastOrderInsertPoint(String querySelect) {
int orderIndex = querySelect.toLowerCase().lastIndexOf("order by");
if (orderIndex == -1
|| !isBracketCanPartnership(querySelect.substring(orderIndex,
querySelect.length()))) {
throw new RuntimeException("My SQL 分页必须要有Order by 语句!");
}
return orderIndex;
}
/**
* 得到分页的SQL
*
* @param offset
* 偏移量
* @param limit
* 位置
* @return 分页SQL
*/
public static String getLimitString(String querySelect, int offset,
int limit) {
querySelect = getLineSql(querySelect);
String sql = querySelect.replaceAll("[^\\s,]+\\.", "") + " limit "
+ offset + " ," + limit;
return sql;
}
/**
* 将SQL语句变成一条语句，并且每个单词的间隔都是1个空格
*
* @param sql
* SQL语句
* @return 如果sql是NULL返回空，否则返回转化后的SQL
*/
private static String getLineSql(String sql) {
return sql.replaceAll("[\r\n]", " ").replaceAll("\\s{2,}", " ");
}
/**
* 得到SQL第一个正确的FROM的的插入点
*/
private static int getAfterFormInsertPoint(String querySelect) {
String regex = "\\s+FROM\\s+";
Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(querySelect);
while (matcher.find()) {
int fromStartIndex = matcher.start(0);
String text = querySelect.substring(0, fromStartIndex);
if (isBracketCanPartnership(text)) {
return fromStartIndex;
}
}
return 0;
}
/**
* 判断括号"()"是否匹配,并不会判断排列顺序是否正确
*
* @param text
* 要判断的文本
* @return 如果匹配返回TRUE,否则返回FALSE
*/
private static boolean isBracketCanPartnership(String text) {
if (text == null
|| (getIndexOfCount(text, ‘(‘) != getIndexOfCount(text, ‘)‘))) {
return false;
}
return true;
}
/**
* 得到一个字符在另一个字符串中出现的次数
*
* @param text
* 文本
* @param ch
* 字符
*/
private static int getIndexOfCount(String text, char ch) {
int count = 0;
for (int i = 0; i < text.length(); i++) {
count = (text.charAt(i) == ch) ? count + 1 : count;
}
return count;
}
}
4.OracleDialect.java
package com.labway.portal.page;
/**
* @author badqiu
*/
public class OracleDialect extends Dialect {
@Override
public String getLimitString(String sql, int offset, int limit) {
sql = sql.trim();
boolean isForUpdate = false;
if (sql.toLowerCase().endsWith(" for update")) {
sql = sql.substring(0, sql.length() - 11);
isForUpdate = true;
}
StringBuffer pagingSelect = new StringBuffer(sql.length() + 100);
pagingSelect
.append("select * from ( select row_.*, rownum rownum_ from ( ");
pagingSelect.append(sql);
pagingSelect.append(" ) row_ ) where rownum_ > " + offset
+ " and rownum_ <= " + (offset + limit));
if (isForUpdate) {
pagingSelect.append(" for update");
}
return pagingSelect.toString();
}
}
5.Page.java
package com.labway.portal.page;
public class Page implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
protected int pageSize = 10; // 每页默认10条数据
protected int currentPage = 1; // 当前页
protected int totalPages = 0; // 总页数
protected int totalRows = 0; // 总数据数
protected int pageStartRow = 0; // 每页的起始行数
protected int pageEndRow = 0; // 每页显示数据的终止行数
protected boolean pagination = false; // 是否分页
boolean hasNextPage = false; // 是否有下一页
boolean hasPreviousPage = false; // 是否有前一页
protected String pagedView; // 用于页面显示
Object obj; // 参数对象与返回对象
// List<Object> resultList; // 返回的结果
// Map<String,Object> param; //查询入参
public Page(int rows, int pageSize) {
this.init(rows, pageSize);
}
public Page() {
}
/**
* 初始化分页参数:需要先设置totalRows
*
*/
public void init(int rows, int pageSize) {
this.pageSize = pageSize;
this.totalRows = rows;
if ((totalRows % pageSize) == 0) {
totalPages = totalRows / pageSize;
} else {
totalPages = totalRows / pageSize + 1;
}
}
public void init(int rows, int pageSize, int currentPage) {
this.pageSize = pageSize;
this.totalRows = rows;
if ((totalRows % pageSize) == 0) {
totalPages = totalRows / pageSize;
} else {
totalPages = totalRows / pageSize + 1;
}
if (currentPage != 0)
gotoPage(currentPage);
setPagedView(null);
}
/**
* 计算当前页的取值范围：pageStartRow和pageEndRow
*
*/
private void calculatePage() {
if ((currentPage - 1) > 0) {
hasPreviousPage = true;
} else {
hasPreviousPage = false;
}
if (currentPage >= totalPages) {
hasNextPage = false;
} else {
hasNextPage = true;
}
if (currentPage * pageSize < totalRows) { // 判断是否为最后一页
pageEndRow = currentPage * pageSize;
pageStartRow = pageEndRow - pageSize;
} else {
pageEndRow = totalRows;
pageStartRow = pageSize * (totalPages - 1);
}
}
/**
* 直接跳转到指定页数的页面
*
* @param page
*/
public void gotoPage(int page) {
currentPage = page;
calculatePage();
// debug1();
}
public void debug1() {
System.out.println("要显示的页面数据已经封装,具体信息如下：");
String debug = "共有数据数:" + totalRows + "共有页数:" + totalPages + "当前页数为:"
+ currentPage + "是否有前一页:" + hasPreviousPage + "是否有下一页:"
+ hasNextPage + "开始行数:" + pageStartRow + "终止行数:" + pageEndRow;
System.out.println(debug);
}
// public void setPagedView(String path) {
//
// StringBuffer sb = new StringBuffer();
// sb.append("<TABLE width=‘100%‘ class=‘content9‘>");
// sb.append("<TBODY>");
// sb.append("<TR>");
// sb.append("<TD align=left width=‘50%‘>");
// sb.append(" ");
//
// if (hasPreviousPage) {
// sb.append("<a href=http://www.mamicode.com/‘"
// + path
// + "page=1‘><IMG title=‘第一页‘ src=http://www.mamicode.com/images/0.gif‘ border=0>");
// sb.append(" ");
// sb.append("<a href=http://www.mamicode.com/‘"
// + path
// + "page="
// + (currentPage - 1)
// + "‘><IMG title=‘上一页‘ src=http://www.mamicode.com/images/1.gif‘ border=0>");
// } else {
// sb.append("<IMG title=‘第一页‘ src=http://www.mamicode.com/images/0.gif‘ border=0>");
// sb.append(" ");
// sb.append("<IMG title=‘上一页‘ src=http://www.mamicode.com/images/1.gif‘ border=0>");
// }
// sb.append(" ");
//
// if (hasNextPage) {
// sb.append("<a href=http://www.mamicode.com/‘"
// + path
// + "page="
// + (currentPage + 1)
// + "‘><IMG title=‘下一页‘ src=http://www.mamicode.com/images/2.gif‘ border=0>");
// sb.append(" ");
// sb.append("<a href=http://www.mamicode.com/‘"
// + path
// + "page="
// + totalPages
// + "‘><IMG title=‘最末页‘ src=http://www.mamicode.com/images/3.gif‘ border=0>");
// } else {
// sb.append("<IMG title=‘下一页‘ src=http://www.mamicode.com/images/2.gif‘ border=0>");
// sb.append(" ");
// sb.append("<IMG title=‘最末页‘ src=http://www.mamicode.com/images/3.gif‘ border=0>");
// }
// sb.append("</TD>");
// sb.append("<TD align=right width=‘50%‘>");
// sb.append(" 每页<INPUT type=text size=5 name=pageSize value="http:// + pageSize + " class=‘form‘ style=‘width:30px;‘>");
// sb.append("文档总数: " + totalRows + ", 共" + totalPages + "页, 第"
// + currentPage + "页, 转到 ");
// sb.append("<INPUT type=text size=5 name=page value="http://www.mamicode.com/ + currentPage">");
// sb.append(" ");
// sb.append("<INPUT onclick=‘submit_pagedForm()‘ type=button class=‘button2‘ value=http://www.mamicode.com/‘ GO ‘>");
// sb.append(" ");
// sb.append("<INPUT name=totalPages type=hidden value=http://www.mamicode.com/‘" + totalPages
// + "‘>");
// sb.append(" ");
// sb.append("<INPUT name=totalRows type=hidden value=http://www.mamicode.com/‘" + totalRows
// + "‘>");
// sb.append(" ");
//
// sb.append("</TD>");
// sb.append("</TR>");
// sb.append("</TBODY>");
// sb.append("</TABLE>");
//
// sb.append("<script type=\"text/javascript\">\n");
// sb.append("function submit_pagedForm(){\n");
// sb.append(" var page = document.forms[0].page.value;\n");
// sb.append("var reg=eval(‘/^[0-9]+$/‘);\n");
// sb.append("var flag = reg.test(page);\n");
// sb.append("if(!flag){\n" + "alert(‘跳转页必须是数字‘);\n" + "return false;}\n");
// sb.append("var pageSize = document.forms[0].pageSize.value;\n");
// sb.append("var reg=eval(‘/^[0-9]+$/‘);\n");
// sb.append("var flag = reg.test(pageSize);\n");
// sb.append("if(!flag){alert(‘每页显示数必须是数字‘);\n" + "return false;}\n");
// sb.append("var totalPages = 0;\n");
// sb.append("totalPages = document.forms[0].totalPages.value;\n");
// sb.append("if (parseInt(page) > parseInt(totalPages) || parseInt(page) <1) {page =1;}\n");
// sb.append("document.forms[0].submit();\n");
// sb.append("}\n");
// sb.append("function search_pagedForm(page) {\n");
// sb.append("document.forms[0].page.value = page;\n");
// sb.append("document.forms[0].target=‘_self‘;\n");
// sb.append("document.forms[0].submit();\n");
// sb.append("}\n");
// sb.append("</script>\n");
// pagedView = sb.toString();
//
// }
public void setPagedView(String form) {
String formName = "forms[0]";
if (form != null) {
formName = form;
}
StringBuffer sb = new StringBuffer();
sb.append("<INPUT type=hidden name=fromPage id=fromPage value=http://www.mamicode.com/‘‘/>");
sb.append("<TABLE width=‘100%‘ class=‘content9‘ cellpadding=‘0‘ cellspacing=‘0‘>");
sb.append("<TBODY>");
sb.append("<TR>");
sb.append("<TD align=left width=‘40%‘>");
sb.append(" ");
if (hasPreviousPage) {
// sb.append("<a href=http://www.mamicode.com/‘#‘ onclick=‘search_pagedForm(1);return false;‘>![](/‘#/‘" "‘第一页‘")
");
sb.append(" ");
sb.append("<input type=‘button‘ value=http://www.mamicode.com/‘上一页‘ class=‘button‘ onclick=‘search_pagedForm("
+ (currentPage - 1) + ");return false;‘>");
// sb.append("<a href=http://www.mamicode.com/‘#‘ onclick=‘search_pagedForm("
// + (currentPage - 1)
// +
// ");return false;‘><IMG title=‘上一页‘ src=http://www.mamicode.com/images/1.gif‘ border=0>");
} else {
sb.append("<input type=‘button‘ value=http://www.mamicode.com/‘首页‘ class=‘button‘ onclick=‘search_pagedForm(1);return false;‘ disabled=‘disabled‘>");
sb.append(" ");
sb.append("<input type=‘button‘ value=http://www.mamicode.com/‘上一页‘ class=‘button‘ onclick=‘search_pagedForm("
+ (currentPage - 1)
+ ");return false;‘ disabled=‘disabled‘>");
// sb.append("<IMG title=‘第一页‘ src=http://www.mamicode.com/images/0.gif‘ border=0>");
// sb.append(" ");
// sb.append("<IMG title=‘上一页‘ src=http://www.mamicode.com/images/1.gif‘ border=0>");
}
sb.append(" ");
if (hasNextPage) {
sb.append("<input type=‘button‘ value=http://www.mamicode.com/‘下一页‘ class=‘button‘ onclick=‘search_pagedForm("
+ (currentPage + 1) + ");return false;‘>");
// sb.append("<a href=http://www.mamicode.com/‘#‘ onclick=‘search_pagedForm("
// + (currentPage + 1)
// +
// ");return false;‘><IMG title=‘下一页‘ src=http://www.mamicode.com/images/2.gif‘ border=0>");
sb.append(" ");
sb.append("<input type=‘button‘ value=http://www.mamicode.com/‘末页‘ class=‘button‘ onclick=‘search_pagedForm("
+ totalPages + ");return false;‘>");
// sb.append("<a href=http://www.mamicode.com/‘#‘ onclick=‘search_pagedForm("
// + totalPages
// +
// ");return false;‘><IMG title=‘最末页‘ src=http://www.mamicode.com/images/3.gif‘ border=0>");
} else {
sb.append("<input type=‘button‘ value=http://www.mamicode.com/‘下一页‘ class=‘button‘ onclick=‘search_pagedForm("
+ (currentPage + 1)
+ ");return false;‘ disabled=‘disabled‘>");
sb.append(" ");
sb.append("<input type=‘button‘ value=http://www.mamicode.com/‘末页‘ class=‘button‘ onclick=‘search_pagedForm("
+ totalPages + ");return false;‘ disabled=‘disabled‘>");
// sb.append("<IMG title=‘下一页‘ src=http://www.mamicode.com/images/2.gif‘ border=0>");
// sb.append(" ");
// sb.append("<IMG title=‘最末页‘ src=http://www.mamicode.com/images/3.gif‘ border=0>");
}
sb.append("</TD>");
sb.append("<TD align=right width=‘60%‘>");
sb.append("总数: " + totalRows + ", 共" + totalPages + "页, 第"
+ currentPage + "页, 转到 ");
sb.append("<INPUT type=text size=5 name=page value="http://www.mamicode.com/ + currentPage" class=‘form‘ style=‘width:30px;‘>");
sb.append(" ");
sb.append(" 每页<INPUT type=text size=5 name=pageSize value="http://www.mamicode.com/+ pageSize + " class=‘form‘ style=‘width:30px;‘>");
sb.append("<INPUT name=totalPages type=hidden value=http://www.mamicode.com/‘" + totalPages
+ "‘>");
sb.append(" ");
sb.append("<INPUT name=totalRows type=hidden value=http://www.mamicode.com/‘" + totalRows
+ "‘>");
sb.append(" ");
sb.append("<INPUT onclick=‘submit_pagedForm()‘ type=button value=http://www.mamicode.com/‘GO‘ class=‘button2‘>");
sb.append(" ");
sb.append("</TD>");
sb.append("</TR>");
sb.append("</TBODY>");
sb.append("</TABLE>");
sb.append("<script type=\"text/javascript\">\n");
sb.append("function submit_pagedForm(){\n");
sb.append(" var page = document." + formName + ".page.value;\n");
sb.append("var reg=eval(‘/^[0-9]+$/‘);\n");
sb.append("var flag = reg.test(page);\n");
sb.append("if(!flag){\n" + "alert(‘跳转页必须是数字‘);\n" + "return false;}\n");
sb.append("var pageSize = document." + formName + ".pageSize.value;\n");
sb.append("var reg=eval(‘/^[0-9]+$/‘);\n");
sb.append("var flag = reg.test(pageSize);\n");
sb.append("if(!flag){alert(‘每页显示数必须是数字‘);\n" + "return false;}\n");
sb.append("var totalPages = 0;\n");
sb.append("totalPages = document." + formName + ".totalPages.value;\n");
sb.append("if (parseInt(page) > parseInt(totalPages) ) {document."
+ formName + ".page.value =totalPages;}\n");
sb.append("if(parseInt(page) <1) {document." + formName
+ ".page.value =1;}\n");
sb.append("document." + formName + ".fromPage.value=http://www.mamicode.com/‘true‘;/n");
sb.append("document." + formName + ".submit();\n");
sb.append("}\n");
sb.append("function search_pagedForm(page) {\n");
sb.append("document." + formName + ".page.value = page;\n");
sb.append("document." + formName + ".target=‘_self‘;\n");
sb.append("document." + formName + ".fromPage.value=http://www.mamicode.com/‘true‘;/n");
sb.append("document." + formName + ".submit();\n");
sb.append("}\n");
sb.append("</script>\n");
pagedView = sb.toString();
}
public void setPagedView1() {
StringBuffer sb = new StringBuffer();
sb.append("<TABLE width=‘100%‘ class=‘content9‘>");
sb.append("<TBODY>");
sb.append("<TR>");
sb.append("<TD align=left width=‘20%‘>");
sb.append(" ");
if (hasPreviousPage) {
sb.append("<a href=http://www.mamicode.com/‘#‘ onclick=‘search_pagedForm(1);return false;‘>
");
sb.append(" ");
sb.append("<a href=http://www.mamicode.com/‘#‘ onclick=‘search_pagedForm("
+ (currentPage - 1)
+ ");return false;‘><IMG title=‘上一页‘ src=http://www.mamicode.com/‘../images/1.gif‘ border=0>");
} else {
sb.append("<IMG title=‘第一页‘ src=http://www.mamicode.com/‘../images/0.gif‘ border=0>");
sb.append(" ");
sb.append("<IMG title=‘上一页‘ src=http://www.mamicode.com/‘../images/1.gif‘ border=0>");
}
sb.append(" ");
if (hasNextPage) {
sb.append("<a href=http://www.mamicode.com/‘#‘ onclick=‘search_pagedForm("
+ (currentPage + 1)
+ ");return false;‘><IMG title=‘下一页‘ src=http://www.mamicode.com/‘../images/2.gif‘ border=0>");
sb.append(" ");
sb.append("<a href=http://www.mamicode.com/‘#‘ onclick=‘search_pagedForm("
+ totalPages
+ ");return false;‘><IMG title=‘最末页‘ src=http://www.mamicode.com/‘../images/3.gif‘ border=0>");
} else {
sb.append("<IMG title=‘下一页‘ src=http://www.mamicode.com/‘../images/2.gif‘ border=0>");
sb.append(" ");
sb.append("<IMG title=‘最末页‘ src=http://www.mamicode.com/‘../images/3.gif‘ border=0>");
}
sb.append("</TD>");
sb.append("<TD align=right width=‘80%‘>");
sb.append("文档总数: " + totalRows + ", 共" + totalPages + "页, 第"
+ currentPage + "页, 转到 ");
sb.append("<INPUT type=text size=5 name=page value="http://www.mamicode.com/ + currentPage" class=‘form‘ style=‘width:30px;‘>");
sb.append(" ");
sb.append(" 每页<INPUT type=text size=5 name=pageSize value="http://www.mamicode.com/+ pageSize + " class=‘form‘ style=‘width:30px;‘>");
sb.append("<INPUT name=totalPages type=hidden value=http://www.mamicode.com/‘" + totalPages
+ "‘>");
sb.append(" ");
sb.append("<INPUT name=totalRows type=hidden value=http://www.mamicode.com/‘" + totalRows
+ "‘>");
sb.append(" ");
sb.append("<INPUT onclick=‘submit_pagedForm()‘ type=button value=http://www.mamicode.com/‘ GO ‘ class=‘button2‘>");
sb.append(" ");
sb.append("</TD>");
sb.append("</TR>");
sb.append("</TBODY>");
sb.append("</TABLE>");
sb.append("<script type=\"text/javascript\">\n");
sb.append("function submit_pagedForm(){\n");
sb.append(" var page = document.forms[0].page.value;\n");
sb.append("var reg=eval(‘/^[0-9]+$/‘);\n");
sb.append("var flag = reg.test(page);\n");
sb.append("if(!flag){\n" + "alert(‘跳转页必须是数字‘);\n" + "return false;}\n");
sb.append("var pageSize = document.forms[0].pageSize.value;\n");
sb.append("var reg=eval(‘/^[0-9]+$/‘);\n");
sb.append("var flag = reg.test(pageSize);\n");
sb.append("if(!flag){alert(‘每页显示数必须是数字‘);\n" + "return false;}\n");
sb.append("var totalPages = 0;\n");
sb.append("totalPages = document.forms[0].totalPages.value;\n");
sb.append("if (parseInt(page) > parseInt(totalPages) || parseInt(page) <1) {page =1;}\n");
sb.append("document.forms[0].submit();\n");
sb.append("}\n");
sb.append("function search_pagedForm(page) {\n");
sb.append("document.forms[0].page.value = page;\n");
sb.append("document.forms[0].target=‘_self‘;\n");
sb.append("document.forms[0].submit();\n");
sb.append("}\n");
sb.append("</script>\n");
pagedView = sb.toString();
}
/**
* 前台分页页面导航的显示
*
* @return String
*/
public void setPagedView1(String path) {
StringBuffer sb = new StringBuffer();
sb.append(" ");
if (hasPreviousPage)
sb.append("<a href=http://www.mamicode.com/""
+ path
+ "page=1\"><img src=http://www.mamicode.com/"../images/houtui.gif\" border=0></a> <a href=http://www.mamicode.com/""
+ path + "page=" + (currentPage - 1)
+ "\"><img src=http://www.mamicode.com/"../images/houtui2.gif\" border=0></a>");
else
sb.append("<img src=http://www.mamicode.com/"../images/houtui.gif\" border=0> <img src=http://www.mamicode.com/"../images/houtui2.gif\" border=0>");
sb.append(" ");
if (hasNextPage)
sb.append("<a href=http://www.mamicode.com/""
+ path
+ "page="
+ (currentPage + 1)
+ "\"><img src=http://www.mamicode.com/"../images/qianjin.gif\" border=0></a> <a href=http://www.mamicode.com/""
+ path + "page=" + totalPages
+ "\"><img src=http://www.mamicode.com/"../images/qianjin2.gif\" border=0></a>");
else
sb.append("<img src=http://www.mamicode.com/"../images/qianjin.gif\" border=0> <img src=http://www.mamicode.com/"../images/qianjin2.gif\" border=0>");
sb.append(" ");
sb.append("当前页/总页数:");
sb.append(currentPage);
sb.append("/");
sb.append(totalPages);
sb.append(" ");
sb.append("<script type=\"text/javascript\">\n");
sb.append("function submit_pagedForm(){\n");
sb.append(" var page = document.forms[0].page.value;\n");
sb.append("var reg=eval(‘/^[0-9]+$/‘);\n");
sb.append("var flag = reg.test(page);\n");
sb.append("if(!flag){\n" + "alert(‘跳转页必须是数字‘);\n" + "return false;}\n");
sb.append("var pageSize = document.forms[0].pageSize.value;\n");
sb.append("var reg=eval(‘/^[0-9]+$/‘);\n");
sb.append("var flag = reg.test(pageSize);\n");
sb.append("if(!flag){alert(‘每页显示数必须是数字‘);\n" + "return false;}\n");
sb.append("var totalPages = 0;\n");
sb.append("totalPages = document.forms[0].totalPages.value;\n");
sb.append("if (parseInt(page) > parseInt(totalPages) || parseInt(page) <1) {page =1;}\n");
sb.append("document.forms[0].submit();\n");
sb.append("}\n");
sb.append("function search_pagedForm(page) {\n");
sb.append("document.forms[0].page.value = page;\n");
sb.append("document.forms[0].target=‘_self‘;\n");
sb.append("document.forms[0].submit();\n");
sb.append("}\n");
sb.append("</script>\n");
pagedView = sb.toString();
}
// public void setPagedView(String path) {
//
// StringBuffer sb = new StringBuffer();
//
// sb.append("当前页/总页数:");
// sb.append(currentPage);
// sb.append("/");
// sb.append(totalPages);
// sb.append(" ");
//
// if (hasPreviousPage)
// sb.append(
// "<a href=http://www.mamicode.com/""
// + path
// + "page=1\">首页</a> <a href=http://www.mamicode.com/""
// + path
// + "page="
// + (currentPage - 1)
// + "\">上一页</a>");
// else
// sb.append("首页 上一页");
// sb.append("/");
//
// if (hasNextPage)
// sb.append(
// "<a href=http://www.mamicode.com/""
// + path
// + "page="
// + (currentPage + 1)
// + "\">下一页</a> <a href=http://www.mamicode.com/""
// + path
// + "page="
// + totalPages
// + "\">尾页</a>");
// else
// sb.append("下一页 尾页");
//
// pagedView = sb.toString();
// }
public String getPagedView() {
return pagedView;
}
/**
* @return
*/
public int getCurrentPage() {
return currentPage;
}
/**
* @return
*/
public boolean isHasNextPage() {
return hasNextPage;
}
/**
* @return
*/
public boolean isHasPreviousPage() {
return hasPreviousPage;
}
/**
* @return
*/
public int getPageEndRow() {
return pageEndRow;
}
/**
* @return
*/
public int getPageSize() {
return pageSize;
}
/**
* @return
*/
public int getPageStartRow() {
return pageStartRow;
}
/**
* @return
*/
public int getTotalPages() {
return totalPages;
}
/**
* @return
*/
public int getTotalRows() {
return totalRows;
}
/**
* @param i
*/
public void setTotalPages(int i) {
totalPages = i;
}
/**
* @param i
*/
public void setCurrentPage(int i) {
currentPage = i;
}
/**
* @param b
*/
public void setHasNextPage(boolean b) {
hasNextPage = b;
}
/**
* @param b
*/
public void setHasPreviousPage(boolean b) {
hasPreviousPage = b;
}
/**
* @param i
*/
public void setPageEndRow(int i) {
pageEndRow = i;
}
/**
* @param i
*/
public void setPageSize(int i) {
pageSize = i;
}
/**
* @param i
*/
public void setPageStartRow(int i) {
pageStartRow = i;
}
/**
* @param i
*/
public void setTotalRows(int i) {
totalRows = i;
}
public boolean isPagination() {
return pagination;
}
public void setPagination(boolean pagination) {
this.pagination = pagination;
}
}6.PageContext.java
package com.labway.portal.page;
public class PageContext extends Page {
private static ThreadLocal<PageContext> context = new ThreadLocal<PageContext>();
public static PageContext getContext() {
PageContext ci = context.get();
if (ci == null) {
ci = new PageContext();
context.set(ci);
}
return ci;
}
public static void removeContext() {
context.remove();
}
protected void initialize() {
}
}
7.ReflectHelper.java
package com.labway.portal.page;
import java.lang.reflect.Field;
/**
* @author Administrator 反射工具
*/
public class ReflectHelper {
/**
* 获取obj对象fieldName的Field
*
* @param obj
* @param fieldName
* @return
*/
public static Field getFieldByFieldName(Object obj, String fieldName) {
for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass
.getSuperclass()) {
try {
return superClass.getDeclaredField(fieldName);
} catch (NoSuchFieldException e) {
}
}
return null;
}
/**
* 检查是否含有分页或本来就是分页类
*
* @param obj
* @param fieldName
* @return
*/
public static Object isPage(Object obj, String fieldName) {
if (obj instanceof java.util.Map) {
java.util.Map map = (java.util.Map) obj;
return map.get(fieldName);
} else {
for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass
.getSuperclass()) {
try {
return superClass.getDeclaredField(fieldName);
} catch (NoSuchFieldException e) {
}
}
return null;
}
}
/**
* 获取obj对象fieldName的属性值
*
* @param obj
* @param fieldName
* @return
* @throws SecurityException
* @throws NoSuchFieldException
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/
public static Object getValueByFieldName(Object obj, String fieldName)
throws SecurityException, NoSuchFieldException,
IllegalArgumentException, IllegalAccessException {
Field field = getFieldByFieldName(obj, fieldName);
Object value = null;
if (field != null) {
if (field.isAccessible()) {
value = field.get(obj);
} else {
field.setAccessible(true);
value = field.get(obj);
field.setAccessible(false);
}
}
return value;
}
/**
* 设置obj对象fieldName的属性值
*
* @param obj
* @param fieldName
* @param value
* @throws SecurityException
* @throws NoSuchFieldException
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/
public static void setValueByFieldName(Object obj, String fieldName,
Object value) throws SecurityException, NoSuchFieldException,
IllegalArgumentException, IllegalAccessException {
if (obj instanceof java.util.Map) {
java.util.Map map = (java.util.Map) obj;
map.put(fieldName, value);
} else {
Field field = obj.getClass().getDeclaredField(fieldName);
if (field.isAccessible()) {
field.set(obj, value);
} else {
field.setAccessible(true);
field.set(obj, value);
field.setAccessible(false);
}
}
}
}8.PaginationInterceptor.java
package com.labway.portal.page.interceptor;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import java.util.Properties;
import org.apache.ibatis.builder.xml.dynamic.ForEachSqlNode;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.executor.ExecutorException;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.MappedStatement.Builder;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.mapping.ParameterMode;
import org.apache.ibatis.mapping.SqlSource;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.property.PropertyTokenizer;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandler;
import org.apache.ibatis.type.TypeHandlerRegistry;
import com.labway.portal.page.Dialect;
import com.labway.portal.page.OracleDialect;
import com.labway.portal.page.Page;
import com.labway.portal.page.PageContext;
import com.labway.portal.page.ReflectHelper;
//只拦截select部分
@Intercepts({ @Signature(type = Executor.class, method = "query", args = {
MappedStatement.class, Object.class, RowBounds.class,
ResultHandler.class }) })
public class PaginationInterceptor implements Interceptor {
private final static Log log = LogFactory
.getLog(PaginationInterceptor.class);
Dialect dialect = new OracleDialect();
public Object intercept(Invocation invocation) throws Throwable {
MappedStatement mappedStatement = (MappedStatement) invocation
.getArgs()[0];
Object parameter = invocation.getArgs()[1];
BoundSql boundSql = mappedStatement.getBoundSql(parameter);
String originalSql = boundSql.getSql().trim();
RowBounds rowBounds = (RowBounds) invocation.getArgs()[2];
Object parameterObject = boundSql.getParameterObject();
if (boundSql == null || boundSql.getSql() == null
|| "".equals(boundSql.getSql())) {
return null;
}
// 分页参数--上下文传参
Page page = null;
PageContext context = PageContext.getContext();
// map传参每次都将currentPage重置,先判读map再判断context
if (parameterObject != null) {
page = (Page) ReflectHelper.isPage(parameterObject, "page");
}
// 分页参数--context参数里的Page传参
if (page == null && context.isPagination() == true) {
page = context;
}
// 后面用到了context的东东
if (page != null && page.isPagination() == true) {
int totalRows = page.getTotalRows();
// 得到总记录数
if (true) {// totalRows == 0
StringBuffer countSql = new StringBuffer(
originalSql.length() + 100);
countSql.append("select count(1) from (").append(originalSql)
.append(") t");
Connection connection = mappedStatement.getConfiguration()
.getEnvironment().getDataSource().getConnection();
PreparedStatement countStmt = connection
.prepareStatement(countSql.toString());
BoundSql countBS = new BoundSql(
mappedStatement.getConfiguration(),
countSql.toString(), boundSql.getParameterMappings(),
parameterObject);
setParameters(countStmt, mappedStatement, countBS,
parameterObject);
ResultSet rs = countStmt.executeQuery();
if (rs.next()) {
totalRows = rs.getInt(1);
}
rs.close();
countStmt.close();
connection.close();
}
// 分页计算
page.init(totalRows, page.getPageSize(), page.getCurrentPage());
if (rowBounds == null || rowBounds == RowBounds.DEFAULT) {
rowBounds = new RowBounds(page.getPageSize()
* (page.getCurrentPage() - 1), page.getPageSize());
}
// 分页查询 本地化对象 修改数据库注意修改实现
String pagesql = dialect.getLimitString(originalSql,
rowBounds.getOffset(), rowBounds.getLimit());
invocation.getArgs()[2] = new RowBounds(RowBounds.NO_ROW_OFFSET,
RowBounds.NO_ROW_LIMIT);
BoundSql newBoundSql = new BoundSql(
mappedStatement.getConfiguration(), pagesql,
boundSql.getParameterMappings(),
boundSql.getParameterObject());
MappedStatement newMs = copyFromMappedStatement(mappedStatement,
new BoundSqlSqlSource(newBoundSql));
invocation.getArgs()[0] = newMs;
page.setPagination(false);
}
return invocation.proceed();
}
public static class BoundSqlSqlSource implements SqlSource {
BoundSql boundSql;
public BoundSqlSqlSource(BoundSql boundSql) {
this.boundSql = boundSql;
}
public BoundSql getBoundSql(Object parameterObject) {
return boundSql;
}
}
public Object plugin(Object arg0) {
return Plugin.wrap(arg0, this);
}
public void setProperties(Properties arg0) {
}
/**
* 对SQL参数(?)设值,参考org.apache.ibatis.executor.parameter.
* DefaultParameterHandler
*
* @param ps
* @param mappedStatement
* @param boundSql
* @param parameterObject
* @throws SQLException
*/
private void setParameters(PreparedStatement ps,
MappedStatement mappedStatement, BoundSql boundSql,
Object parameterObject) throws SQLException {
ErrorContext.instance().activity("setting parameters")
.object(mappedStatement.getParameterMap().getId());
List<ParameterMapping> parameterMappings = boundSql
.getParameterMappings();
if (parameterMappings != null) {
Configuration configuration = mappedStatement.getConfiguration();
TypeHandlerRegistry typeHandlerRegistry = configuration
.getTypeHandlerRegistry();
MetaObject metaObject = parameterObject == null ? null
: configuration.newMetaObject(parameterObject);
for (int i = 0; i < parameterMappings.size(); i++) {
ParameterMapping parameterMapping = parameterMappings.get(i);
if (parameterMapping.getMode() != ParameterMode.OUT) {
Object value;
String propertyName = parameterMapping.getProperty();
PropertyTokenizer prop = new PropertyTokenizer(propertyName);
if (parameterObject == null) {
value = http://www.mamicode.com/null;
} else if (typeHandlerRegistry
.hasTypeHandler(parameterObject.getClass())) {
value = http://www.mamicode.com/parameterObject;
} else if (boundSql.hasAdditionalParameter(propertyName)) {
value = http://www.mamicode.com/boundSql.getAdditionalParameter(propertyName);
} else if (propertyName
.startsWith(ForEachSqlNode.ITEM_PREFIX)
&& boundSql.hasAdditionalParameter(prop.getName())) {
value = http://www.mamicode.com/boundSql.getAdditionalParameter(prop.getName());
if (value != null) {
value = http://www.mamicode.com/configuration.newMetaObject(value)
.getValue(
propertyName.substring(prop
.getName().length()));
}
} else {
value = http://www.mamicode.com/metaObject == null ? null : metaObject
.getValue(propertyName);
}
TypeHandler typeHandler = parameterMapping.getTypeHandler();
if (typeHandler == null) {
throw new ExecutorException(
"There was no TypeHandler found for parameter "
+ propertyName + " of statement "
+ mappedStatement.getId());
}
typeHandler.setParameter(ps, i + 1, value,
parameterMapping.getJdbcType());
}
}
}
}
private MappedStatement copyFromMappedStatement(MappedStatement ms,
SqlSource newSqlSource) {
Builder builder = new MappedStatement.Builder(ms.getConfiguration(),
ms.getId(), newSqlSource, ms.getSqlCommandType());
builder.resource(ms.getResource());
builder.fetchSize(ms.getFetchSize());
builder.statementType(ms.getStatementType());
builder.keyGenerator(ms.getKeyGenerator());
builder.keyProperty(ms.getKeyProperty());
builder.timeout(ms.getTimeout());
builder.parameterMap(ms.getParameterMap());
builder.resultMaps(ms.getResultMaps());
builder.cache(ms.getCache());
MappedStatement newMs = builder.build();
return newMs;
}
}
二.Action类
/**
* 标准物质出库
* @return
*/
public String selectBzwzchuku() {
String bzwzname = request.getParameter("ck.bzwzname");
Map<String, Object> params = new HashMap<String, Object>();
params.put("bzwzname", bzwzname);
String curpage = request.getParameter("page");
String pageSize = request.getParameter("pageSize");
String fromPage = request.getParameter("fromPage");
PageContext page = PageContext.getContext();
page.setPagedView("pageForm");
if (null == curpage) {
page.setCurrentPage(1);
page.setPageSize(20);
} else {
if (!"true".equals(fromPage)) {
curpage = "1";
}
page.setCurrentPage(Integer.parseInt(curpage));
page.setPageSize(Integer.parseInt(pageSize));
}
page.setPagination(true);// 设置是否分页
List<X_bzwz_chuku> bzwzchukulist = customerService.selectBzwzchuku(params);
request.setAttribute("bzwzchukulist", bzwzchukulist);
request.setAttribute("page", page.getPagedView());
return "selectbzwzchuku";
}三.页面
<body>
<div id="biaoti" class="tbtitle01">
<b>标准物质出库</b>
</div>
<div class="space_h_10"></div>
<s:form action="CustomerAction_selectBzwzchuku" name="pageForm" method="post">
标准物质名称：<s:textfield name="ck.bzwzname" ></s:textfield>
<s:submit value="http://www.mamicode.com/查询"></s:submit>
<table width="100%" border="0" cellpadding="6" cellspacing="0"
class="tb_form1">
<tr>
<th>序号</th>
<th>标准物质名称</th>
<th>发放岗位</th>
<th>发放数量</th>
<th>发放日期</th>
<th>发放人</th>
<th>领用人</th>
</tr>
<s:iterator value="http://www.mamicode.com/#request.bzwzchukulist" >
<tr>
<td><s:property value="http://www.mamicode.com/ckid" /></td>
<td><s:property value="http://www.mamicode.com/bzwzname" /></td>
<td><s:property value="http://www.mamicode.com/ffposition" /></td>
<td><s:property value="http://www.mamicode.com/ffnumber" /></td>
<td><s:property value="http://www.mamicode.com/ffdate.substring(0,10)" /></td>
<td><s:property value="http://www.mamicode.com/ffman" /></td>
<td><s:property value="http://www.mamicode.com/lingyongman" /></td>
</tr>
</s:iterator>
</table>
<!-- <input type="button" value="http://www.mamicode.com/出库" id="ck"/> -->
${page }
</s:form>
</body>本文出自 “大话程序” 博客，请务必保留此出处http://houqida.blog.51cto.com/8877896/1584698
mybatis 分页