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数据库连接操作(一)

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Jun 07, 2016 pm 04:06 PM

jsp具体操作数据库连接

用纯JSP写的连接数据库操，具体包括数据查询、删除、修改，数据的添加在数据库里操作，数据库为MySQL 文件包括login.jsp,do_login.jsp(处理登录信息),index.jsp(显示登录用户名、密码和编辑删除操作),edit.jsp,do_edit.jsp,delete.jsp 登录页面 login.jsp vc

用纯JSP写的连接数据库操，具体包括数据查询、删除、修改，数据的添加在数据库里操作，数据库为MySQL

文件包括login.jsp,do_login.jsp(处理登录信息),index.jsp(显示登录用户名、密码和编辑删除操作),edit.jsp,do_edit.jsp,delete.jsp

登录页面

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do_login.jsp

<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
  <head>  
    <title>登录处理页面</title>
  </head> 
  <body>
    <%
     request.setCharacterEncoding("gb2312");
     response.setContentType("text/html;charset=gb2312");
     String user=request.getParameter("username");
     String pwd=request.getParameter("password");
     
     final String DBDriver="com.mysql.jdbc.Driver";
     final String DBUrl="jdbc:mysql://localhost:3306/mqsqltest";
     final String DBUser="root";
     final String DBPassword="686175";
     Connection conn=null;
     Statement stmt=null;
     ResultSet rs=null;
     Class.forName(DBDriver);
     conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
     String sql="select * from user where username=&#39;"+user+"&#39;&&password=&#39;"+pwd+"&#39;";
     stmt=conn.createStatement();
     rs=stmt.executeQuery(sql);
     if(rs.next()){
        out.print("登录成功!");
        response.setHeader("refresh","2;url=index.jsp");
     }
     else{
        out.println("您登录的账号或密码错误!");
        response.setHeader("refresh","2;url=login.jsp");
     }
     stmt.close();
     conn.close();
  %> 
  </body>
</html>

index.jsp

<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
  <head>
    <title>数据列表</title>
  </head>
  <body>
  <%
     request.setCharacterEncoding("gb2312");
     response.setContentType("text/html;charset=gb2312");
     
     final String DBDriver="com.mysql.jdbc.Driver";
     final String DBUrl="jdbc:mysql://localhost:3306/mqsqltest";
     final String DBUser="root";
     final String DBPassword="686175";
     Connection conn=null;
     Statement stmt=null;
     ResultSet rs=null;
     Class.forName(DBDriver);
     conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
     String sql="select * from user";
     stmt=conn.createStatement();
     rs=stmt.executeQuery(sql);
  %> 
     <table border="1">
     <tr>
       <td>编号</td>
       <td>帐号</td>
       <td>密码</td>
       <td>编辑</td>
       <td>删除</td>
     </tr>
     <% 
     while(rs.next()){
     %>
     <tr>
     <td><%=rs.getInt(1) %></td>
     <td><%=rs.getString(2) %></td>
     <td><%=rs.getString(3) %></td>
     <td><a href="edit.jsp?id=<%=rs.getInt(1)%>">更新</a></td>
     <td><a href="delete.jsp?id=<%=rs.getInt(1)%>">删除</a></td>
     </tr>
     <% 
     } 
     stmt.close();
     conn.close(); 
     %>  
     </table>
  </body>
</html>

编辑页面

编辑后

edit.jsp

<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
  <head>
    <title>编辑页面</title>
  </head>  
  <body>
   <%
     request.setCharacterEncoding("gb2312");
     response.setContentType("text/html;charset=gb2312");
     int id=Integer.parseInt(request.getParameter("id"));
     session.setAttribute("id", id);
     
     final String DBDriver="com.mysql.jdbc.Driver";
     final String DBUrl="jdbc:mysql://localhost:3306/mqsqltest";
     final String DBUser="root";
     final String DBPassword="686175";
     Connection conn=null;
     Statement stmt=null;
     ResultSet rs=null;
     Class.forName(DBDriver);
     conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
     String sql="select * from user where id=&#39;"+id+"&#39;";
     stmt=conn.createStatement();
     rs=stmt.executeQuery(sql);
     rs.next();
    %>
   <center>
  <h3 id="编辑页面">编辑页面</h3>
  <form action="do_edit.jsp" method="post">
  <table>
  <tr>
      <td>帐号</td>
      <td><input type="text" name="username" value=<%=rs.getString(2)%>></td>
  </tr>
  <tr>
      <td>密码</td>
      <td><input type="password" name="password" value=<%=rs.getString(3)%>></td>
  </tr>
  <tr>
      <td></td>
      <td>
          <input type="submit" value="保存">
          <input type="reset" value="取消">
      </td>   
  </tr>
  </table>
  </form>
  </center>
  </body>
</html>

处理编辑页面

do_edit.jsp

<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<%@ page import="java.util.*" %>
<html>
  <head>  
    <title>编辑保存页面</title>
  </head> 
  <body>
   <%
     request.setCharacterEncoding("gb2312");
     response.setContentType("text/html;charset=gb2312");
     int id=Integer.parseInt(session.getAttribute("id").toString());
     String user=request.getParameter("username");
     String pwd=request.getParameter("password");
     
     final String DBDriver="com.mysql.jdbc.Driver";
     final String DBUrl="jdbc:mysql://localhost:3306/mqsqltest";
     final String DBUser="root";
     final String DBPassword="686175";
     Connection conn=null;
     Statement stmt=null;
     ResultSet rs=null;
     Class.forName(DBDriver);
     conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
     stmt=conn.createStatement();
     if(user!=null&&pwd!=null){
      String sql="update user set username=&#39;"+user+"&#39;,password=&#39;"+pwd+"&#39; where id=&#39;"+id+"&#39;";
      stmt.executeUpdate(sql);
      out.print("修改成功!");
      response.setHeader("refresh","2;url=index.jsp");
     }else{
      out.print("帐号或密码不能为空!");
      response.setHeader("refresh","2;url=edit.jsp");
     }
   %>
  </body>
</html>

删除页面

delete.jsp

<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
  <head> 
    <title>删除页面</title>
  </head> 
  <body>
   <%
     request.setCharacterEncoding("gb2312");
     response.setContentType("text/html;charset=gb2312");
     int id=Integer.parseInt(request.getParameter("id"));
     
     final String DBDriver="com.mysql.jdbc.Driver";
     final String DBUrl="jdbc:mysql://localhost:3306/mqsqltest";
     final String DBUser="root";
     final String DBPassword="686175";
     Connection conn=null;
     Statement stmt=null;
     Class.forName(DBDriver);
     conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
     String sql="delete from user where id=&#39;"+id+"&#39;";
     stmt=conn.createStatement();
     stmt.executeUpdate(sql);
     stmt.close();
     conn.close();
     out.print("删除成功!");
     response.setHeader("refresh","2;url=index.jsp");
   %> 
  </body>
</html>

在编译运行前还的将MySQL的驱动包导入WebRoot/WEB-INF/lib下

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