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JavaWeb项目—BBS论坛
项目步骤：
1)将静态html文件转换为JSP文件(涉及到了编码的问题)
2)封装DB
1 package com.bjsxt.bbs; 2 3 import java.sql.Connection; 4 import java.sql.DriverManager; 5 import java.sql.ResultSet; 6 import java.sql.SQLException; 7 import java.sql.Statement; 8 9 //封装DB，方便操作10 public class DB {11 public static Connection getConn() {12 Connection conn = null;13 try {14 Class.forName("com.mysql.jdbc.Driver");15 conn = DriverManager.getConnection(16 "jdbc:mysql://localhost:3306/bbs", "root", "123456");17 } catch (ClassNotFoundException e) {18 e.printStackTrace();19 } catch (SQLException e) {20 e.printStackTrace();21 }22 return conn;23 }24 25 public static Statement createStmt(Connection conn) {26 Statement stmt = null;27 try {28 stmt = conn.createStatement();29 } catch (SQLException e) {30 e.printStackTrace();31 }32 return stmt;33 }34 35 public static ResultSet executeQuery(Statement stmt, String sql) {36 ResultSet rs = null;37 try {38 rs = stmt.executeQuery(sql);39 } catch (SQLException e) {40 e.printStackTrace();41 }42 return rs;43 }44 45 public static void close(Connection conn) {46 if (conn != null) {47 try {48 conn.close();49 } catch (SQLException e) {50 e.printStackTrace();51 }52 conn = null;53 }54 }55 56 public static void close(Statement stmt) {57 if (stmt != null) {58 try {59 stmt.close();60 } catch (SQLException e) {61 e.printStackTrace();62 }63 stmt = null;64 }65 }66 67 public static void close(ResultSet rs) {68 if (rs != null) {69 try {70 rs.close();71 } catch (SQLException e) {72 e.printStackTrace();73 }74 rs = null;75 }76 }77 }
3)树状结构展现(一)
主要代码：
Article.java
1 package com.bjsxt.bbs; 2 3 import java.util.Date; 4 5 public class Article { 6 private int id; 7 private int pid; 8 private int rootId; 9 private String title;10 private String cont;11 private Date pDate;12 private boolean isLeaf;13 private int grade;14 15 public int getGrade() {16 return grade;17 }18 19 public void setGrade(int grade) {20 this.grade = grade;21 }22 23 public int getId() {24 return id;25 }26 27 public void setId(int id) {28 this.id = id;29 }30 31 public int getPid() {32 return pid;33 }34 35 public void setPid(int pid) {36 this.pid = pid;37 }38 39 public int getRootId() {40 return rootId;41 }42 43 public void setRootId(int rootId) {44 this.rootId = rootId;45 }46 47 public String getTitle() {48 return title;49 }50 51 public void setTitle(String title) {52 this.title = title;53 }54 55 public String getCont() {56 return cont;57 }58 59 public void setCont(String cont) {60 this.cont = cont;61 }62 63 public Date getpDate() {64 return pDate;65 }66 67 public void setpDate(Date pDate) {68 this.pDate = pDate;69 }70 71 public boolean isLeaf() {72 return isLeaf;73 }74 75 public void setLeaf(boolean isLeaf) {76 this.isLeaf = isLeaf;77 }78 }
article.jsp文件
<%!private void tree(Set<Article> articles,Connection conn,int id,int grade){ String sql="select * from article where pid="+id; Statement stmt=DB.createStmt(conn); ResultSet rs=DB.executeQuery(stmt, sql); try{ while(rs.next()){ Article a=new Article(); a.setId(rs.getInt("id")); a.setPid(rs.getInt("pid")); a.setRootId(rs.getInt("rootid")); a.setTitle(rs.getString("titel")); a.setLeaf(rs.getInt("isleaf")==0?true:false); a.setpDate(rs.getTimestamp("pdate")); a.setGrade(grade+1); articles.add(a); if(!a.isLeaf()){ tree(articles, conn, id, grade+1); } }catch (SQLException e){ e.printStackTrace(); } } %> <% Set<Article> articles=new HashSet<Article>(); Connection conn=DB.getConn(); tree(articles,conn,0,0); DB.close(conn); %>
未完
JavaWeb项目—BBS论坛
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