版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
代码
还是承接那个select.jsp
update.jsp
<%--
Created by IntelliJ IDEA.
User: 长风
Date: 2019/9/21
Time: 20:03
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" import="java.sql.*" %>
<html>
<head>
<title>数据更新</title>
</head>
<body>
<%!
public static final String DBDRIVER = "com.mysql.cj.jdbc.Driver";
public static final String DBURL = "jdbc:mysql://localhost:3306/webstore?&useSSL=false&serverTimezone=UTC";
public static final String DBUSER = "root";
public static final String DBPASS = "123456";
%>
<%
Connection conn = null;
PreparedStatement pst = null;
ResultSet rs = null;
String id = null;
%>
<%
try {
Class.forName(DBDRIVER);
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
request.setCharacterEncoding("utf-8");
id = request.getParameter("id");
String sql_update = "select * from user_table where id='" + id + "'";
//获取你要更新数据的id的数据库信息
pst = conn.prepareStatement(sql_update);
rs = pst.executeQuery();
if (rs.next()) {
%>
<form action="doupdate.jsp?id=<%=rs.getString("id")%>" method="post">
<%--切换到doupdate,显示要更新的数据信息--%>
用户名：<input type="text" value="<%=rs.getString("用户名")%>" name="user">
密码： <input type="text" value="<%=rs.getString("密码") %>" name="psw">
用户类型：<select name="ty">
<option value="管理员">管理员</option>
<option value="普通用户">普通用户</option>
</select>
<input type="submit" value="修改">
<input type="reset" value="取消">
</form>
<%
}
} catch (Exception e) {
out.println(e);
}
%>
</body>
</html>
doupdate.jsp:
<%--
Created by IntelliJ IDEA.
User: 长风
Date: 2019/9/21
Time: 20:03
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" import="java.sql.*" %>
<html>
<head>
<title>数据更新</title>
</head>
<body>
<%!
public static final String DBDRIVER="com.mysql.cj.jdbc.Driver";
public static final String DBURL="jdbc:mysql://localhost:3306/webstore?&useSSL=false&serverTimezone=UTC";
public static final String DBUSER="root";
public static final String DBPASS="123456";
%>
<%
Connection conn=null;
PreparedStatement pst=null;
int rs=0;
String ids=null;
String user=null;
String psw=null;
String ty=null;
%>
<%
try{
Class.forName(DBDRIVER);
conn=DriverManager.getConnection(DBURL,DBUSER,DBPASS);
request.setCharacterEncoding("utf-8");
ids=request.getParameter("id");
user=request.getParameter("user");
psw=request.getParameter("psw");
ty=request.getParameter("ty");
String sql_update="update user_table set 用户名='"+user+"',密码='"+psw+"',用户类型='"+ty+"'where id='"+ids+"'";
pst=conn.prepareStatement(sql_update);
rs=pst.executeUpdate();
if(rs!=0){
out.println("更新成功");
%>
<jsp:forward page="select.jsp"></jsp:forward>
<%--修改之后转到展示页面--%>
<%
}
}
catch(Exception e){
out.println(e);
}
%>
</body>
</html>
运行结果
更新前
更新中：
更新后：
