- _nosay
JDBC实践-添加功能的实现
2017-12-06 22:32:33
- 重写list.jsp文件,内容如下
<%--
Created by IntelliJ IDEA.
User: nosay
Date: 17-12-5
Time: 下午3:31
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>Title</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row clearfix">
<div class="col-md-12 column">
<form role="form" method="get" action="">
<div class="form-group">
<label for="username">用户名</label><input class="form-control" name="username" value="${requestScope.username}" id="username" type="username" />
</div>
<button type="submit" class="btn btn-default">查询</button>
<a class="btn btn-primary" href="/addUser">添加</a>
</form>
<table class="table">
<thead>
<tr>
<th>编号</th>
<th>用户名</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<c:forEach items="${userList}" var="user" varStatus="status">
<tr>
<td>${status.index +1}</td>
<td>${user.username}</td>
<td><a href="/editUser?id=${user.id}">编辑</a> | <a href="/delUser?id=${user.id}">删除</a></td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
</div>
</div>
</body>
</html>
- 建立AddUserServlet.java文件,内容如下
package com.ungly.servlet;
import com.ungly.service.ListService;
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(name = "AddUserServlet",urlPatterns = "/addUser")
public class AddUserServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8"); //设置编码
String username = request.getParameter("username");
ListService listService = new ListService();
boolean status = listService.addUser(username);
if(status)
{
response.sendRedirect("/List");
}else{
response.setContentType("text/html;charset=utf-8;");
PrintWriter writer = response.getWriter();
writer.write("添加失败");
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.getRequestDispatcher("/WEB-INF/jsp/front/addUser.jsp").forward(request,response);
}
}
- 在UserDao.java文件中,加入addUser方法,内容如下
public boolean addUser(String username)
{
try {
String sql = "INSERT INTO user SET username=?";
this.preparedStatement = this.conn.prepareStatement(sql);
this.preparedStatement.setString(1,username);
int i = this.preparedStatement.executeUpdate();
if(i>0)
{
this.status = true;
}else{
this.status = false;
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
this.conn.close();
this.preparedStatement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return this.status;
}
- 在ListServict.java文件中添加addUser方法,内容为
public boolean addUser(String username)
{
return this.userDao.addUser(username);
}
测试通过,jdbc练习小项目完成
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