目录
1、创建【UpdateByIdServlet.java】
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package com.item.servlet;
import com.item.dao.UserInfoDAO;
import com.item.daoimpl.UserInfoDAOImpl;
import com.item.pojo.UserInfo;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/UpdateByIdServlet")
public class UpdateByIdServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/html;charset=utf-8");
req.setCharacterEncoding("utf-8");
String id=req.getParameter("id");
int i = Integer.parseInt(id);
UserInfoDAO db=new UserInfoDAOImpl();
UserInfo userInfo = db.SelectById(i);
req.setAttribute("userInfo",userInfo);
req.getRequestDispatcher("UpdateServlet.jsp").forward(req,resp);
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req,resp);
}
}
2、创建【UpdateServlet.jsp】
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<%@ page import="com.item.pojo.UserInfo" %><%--
Created by IntelliJ IDEA.
User: 红目香薰
Date: 2022/2/26
Time: 13:30
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>修改页面</title>
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<form action="/UpdateServlet" method="post">
<%
UserInfo userInfo=(UserInfo)request.getAttribute("userInfo");
%>
<p>
<input type="text" name="id" value="<%= userInfo.getId()%>" class="form-control" readonly required/>
</p>
<p>
创建时间:<%= userInfo.getCreateDate()%>
</p>
<p>
<input type="text" placeholder="请输入用户名" value="<%= userInfo.getUserName()%>" name="userName" class="form-control" required/>
</p>
<p>
<input type="text" placeholder="请输入爱好" value="<%= userInfo.getIntroduce()%>" name="introduce" class="form-control" required/>
</p>
<p>
<input type="submit" value="修改" class="btn btn-primary"/>
</p>
</form>
</body>
</html>
3、创建【UpdateServlet.jsp】
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package com.item.servlet;
import com.item.dao.UserInfoDAO;
import com.item.daoimpl.UserInfoDAOImpl;
import com.item.pojo.UserInfo;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet("/UpdateServlet")
public class UpdateServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/html;charset=utf-8");
req.setCharacterEncoding("utf-8");
String id = req.getParameter("id");
String userName = req.getParameter("userName");
String introduce = req.getParameter("introduce");
PrintWriter out = resp.getWriter();
if (id == null || userName == null || introduce == null) {
out.println("<script>alert('参数不允许为空。')</script>");
}
UserInfoDAO db = new UserInfoDAOImpl();
UserInfo userInfo = db.SelectById(Integer.parseInt(id));
userInfo.setUserName(userName);
userInfo.setIntroduce(introduce);
boolean isf = db.UpdateById(userInfo);
if(isf){
out.println("<script>alert('修改成功');window.location.href='/index.jsp';</script>");
}else{
out.println("<script>alert('修改失败');window.location.href='/index.jsp';</script>");
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
}
4、执行测试
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测试成功。?
整个Servlet完成，希望能给大家带来一定的帮助。