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导出功能的实现
10.导出
a.在网页上新建一个导出按钮
<a onclick="toExport()" class="easyui-linkbutton" iconCls="icon-export">导出</a>
b.在JavaScript中写按钮的触发事件
//获取参数
function getJsonParams(){
var searchName = encodeURI($("#ss").textbox("getValue"));
var json={name:searchName,depid:depid};
return json2str(json)
}
//导出
function toExport() {
var paramJsonStr = getJsonParams();
window.location.href = "ProjectExcelExport?systemname=student&type=StuQuery?ms=" + paramJsonStr;
}
值得注意的是：该向后台发送的请求并不是hebe请求，而是servlet请求，因此在请求控制配置不在gatewaybeans.xml中，而是在web.xml中
c.在web.xml中配置请求控制
<!--excel导出-->
<servlet>
<servlet-name>ProjectExcelExport</servlet-name>
<servlet-class>cn.com.goldsea.hebedemo.entity.ProjectExcelExport</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ProjectExcelExport</servlet-name>
<url-pattern>/ProjectExcelExport</url-pattern>
</servlet-mapping>
值得注意的是：该配置文件路径点击能找到该类
d.选一个地方新建一个类ProjectExcelExport，
public class ProjectExcelExport extends HttpServlet{
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.reset();
String systemname = request.getParameter("systemname");
String type = request.getParameter("type");
String params = request.getParameter("params");
String fileName = "";
HSSFWorkbook workbook = new HSSFWorkbook();
//学生查询
if (systemname.equals("student")) {
StudentExcelBean bean = new StudentExcelBean();
Object[] obj = bean.landStudentExcel(type, params, workbook);
fileName = (String) obj[0];
workbook = (HSSFWorkbook) obj[1];
}
值得注意的是：所有导出其他地方都一样，需要改变的就是这里，根据发送的参数不同选择相应的判断条件
response.setContentType("application/vnd.ms-excel;charset=UTF-8");
if (request.getHeader("User-Agent").toLowerCase().indexOf("firefox") > 0) {
fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1"); //firefox浏览器
} else {
fileName = encode(fileName, "UTF-8"); //IE浏览器
}
response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + ".xls" + "\"");
ServletOutputStream sos = null;
try {
sos = response.getOutputStream();
workbook.write(sos);
sos.flush();
} finally {
try {
sos.close();
} catch (IOException e) {
}
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/**
* 替换字符串卷
*
* @param str 被替换的字符串
* @param charset 字符集
* @return 替换好的
* @throws java.io.UnsupportedEncodingException 不支持的字符集
*/
public static String encode(String str, String charset) throws UnsupportedEncodingException {
Pattern p = Pattern.compile("[\u4e00-\u9fa5]+"); //只替换中文汉字
Matcher m = p.matcher(str);
StringBuffer b = new StringBuffer();
while (m.find()) {
m.appendReplacement(b, URLEncoder.encode(m.group(0), charset));
}
m.appendTail(b);
return b.toString();
}
}
e.在需要导出相关的bean包下面新建一个Excel包，在该包下面新建一个StudentExcelBean
该类用于需要导出表的查询或表格名的设置，当然还是需要建一个工具类ExcelUtils。
public class StudentExcelBean extends BaseBean{
public Object[] landStudentExcel(String type, String params, HSSFWorkbook workbook) {
String xlsName = "";
if (type.equals("StuQuery")) {
xlsName = "学生信息一览表";
List<Map<String, Object>> maps = getStuQueryExcelData(params);
if (null != maps) {
StuQueryExcel excel = new StuQueryExcel();
workbook = excel.getStuQueryExcel(workbook, maps, xlsName);
}
}
return new Object[]{xlsName, workbook};
}
private List<Map<String, Object>> getStuQueryExcelData(String param) {
String name = JSON_UTIL.getJsonData(param, "name");
String depid=JSON_UTIL.getJsonData(param,"depid");
String sql= "select s.sno,s.name,s.birthday,s.createtime,s.sex,s.depid,s.loginname,d.depname "+
"from t_student s, t_department d where s.depid = d.id" ;
if(name!=null&&!name.equals("")){
sql += " and s.name like ‘%" + name + "%‘";
}
if(depid!=null&&!depid.equals("")){
sql += " and s.depid=" + depid;
}
sql += " order by d.id";
return DBL_CLIENT.invokeQuery(sql);
}
}
值得注意的是：该类基本上都是需要自己写的。其中这个sql语句拼接就是查询时后台bean中的sql语句。即可以根据条件查询后再导出自己需要的列表
f.在Excel包中再新建一个StuQueryExcel类，该类用于设置导出成Excel表的属性
public class StuQueryExcel {
public HSSFWorkbook getStuQueryExcel(HSSFWorkbook workbook, List<Map<String, Object>> maps, String xlsName) {
HSSFCellStyle cellStyleNormal = workbook.createCellStyle();
cellStyleNormal.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cellStyleNormal.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
cellStyleNormal.setWrapText(true);
HSSFSheet sheet = workbook.createSheet(xlsName);
//设置列宽
sheet.setColumnWidth(0, 3000);
sheet.setColumnWidth(1, 4000);
sheet.setColumnWidth(2, 4000);
sheet.setColumnWidth(3, 4000);
sheet.setColumnWidth(4, 3000);
sheet.setColumnWidth(5, 5000);
HSSFRow row = sheet.createRow(0);
sheet.addMergedRegion(new Region(0, (short) 0, 0, (short) 5));
HSSFCell cell = row.createCell((short) 0);
HSSFFont font = workbook.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font.setFontHeightInPoints((short) 18);
HSSFCellStyle cellStyle = workbook.createCellStyle();
cellStyle.setFont(font);
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cell.setCellStyle(cellStyle);
cell.setCellValue(new HSSFRichTextString(xlsName));
row = sheet.createRow(1);
row.setHeight((short) 400);
ExcelUtils.GenerateNormalCell(new CellRangeAddress(1, 1, 0, 0), 0, "学号", sheet, cellStyleNormal, row);
ExcelUtils.GenerateNormalCell(new CellRangeAddress(1, 1, 1, 1), 1, "姓名", sheet, cellStyleNormal, row);
ExcelUtils.GenerateNormalCell(new CellRangeAddress(1, 1, 2, 2), 2, "生日", sheet, cellStyleNormal, row);
ExcelUtils.GenerateNormalCell(new CellRangeAddress(1, 1, 3, 3), 3, "创建时间", sheet, cellStyleNormal, row);
ExcelUtils.GenerateNormalCell(new CellRangeAddress(1, 1, 4, 4), 4, "性别", sheet, cellStyleNormal, row);
ExcelUtils.GenerateNormalCell(new CellRangeAddress(1, 1, 5, 5), 5, "所属院系", sheet, cellStyleNormal, row);
int rowIndex = 2;
Object[] objects;
for (Map<String, Object> objectMap : maps) {
row = sheet.createRow(rowIndex);
row.setHeight((short) 400);
objects = new Object[6];
objects[0] = objectMap.get("sno") != null ? objectMap.get("sno").toString() : "";
objects[1] = objectMap.get("name") != null ? objectMap.get("name").toString() : "";
if (objectMap.get("birthday") != null) {
objects[2] = DateUtil.time2(Long.valueOf(String.valueOf(objectMap.get("birthday")).substring(0, 8)));
} else {
objects[2] = "";
}
if (objectMap.get("createtime") != null) {
objects[3] = DateUtil.time2(Long.valueOf(String.valueOf(objectMap.get("createtime")).substring(0, 8)));
} else {
objects[3] = "";
}
if (String.valueOf(objectMap.get("sex")).equals("1")) {
objects[4] = "男";
} else {
objects[4] = "女";
}
objects[5] = objectMap.get("depname") != null ? objectMap.get("depname").toString() : "";
loadContractRow(objects, rowIndex, sheet, cellStyleNormal, row);
rowIndex++;
}
return workbook;
}
private void loadContractRow(Object[] objects, int rowIndex, Sheet sheet, HSSFCellStyle cellStyleNormal, HSSFRow row) {
int count = 0;
if (null != objects && objects.length > 0) {
for (int i = 0; i < objects.length; i++) {
ExcelUtils.GenerateNormalCell(new CellRangeAddress(rowIndex, rowIndex, count, count), count, objects[i], sheet, cellStyleNormal, row);
count++;
}
}
}
}
值得注意的是：标蓝的地方都是需要自己写的，根据默认列表字段来写
导出功能的实现