Servlet+mybatis+jsp注解方式实现增删改查

1.需要导入相关包如下。

2.mybatis.xml里面的内容：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--    定义环境-->
<environments default="mysql">
<environment id="mysql">
<!--          定义事务-->
<transactionManager type="JDBC"></transactionManager>
<!--定义数据源            -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatisdb?characterEncoding=UTF-8"/>
<property name="username" value="root"/>
<property name="password" value="wu"/>
</dataSource>
</environment>
</environments>
<!--    映射接口中的sql语句-->
<mappers>
<mapper class="com.inter.AddressDao"></mapper>
</mappers>
</configuration>

3.DButil里面:

package util;

import java.io.Reader;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class DButil {
public static SqlSessionFactory factory;
static {
//通过字符流的读取将主配置文件读取到程序中；
try {
Reader reader= Resources.getResourceAsReader("mybatis.xml");

//创建会话工厂建造者对象
SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder();
//得到会话工厂对象
factory=builder.build(reader);
} catch (Exception e) {
e.printStackTrace();
}
}
//得到链接对象
public static SqlSession getSession(boolean auto){
return  factory.openSession(auto);
}

}

4.把对象进行封装（com.bean里面）：

package com.bean;

public class Address {
private int id;
private String Contactor;
private String Address;
private String Phone;
private String email;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getContactor() {
return Contactor;
}
public void setContactor(String contactor) {
Contactor = contactor;
}
public String getAddress() {
return Address;
}
public void setAddress(String address) {
Address = address;
}
public String getPhone() {
return Phone;
}
public void setPhone(String phone) {
Phone = phone;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "Address [id=" + id + ", Contactor=" + Contactor + ", Address=" + Address + ", Phone=" + Phone
+ ", email=" + email + "]";
}
public Address() {
// TODO Auto-generated constructor stub
}

public Address(int id,String contactor,String address,String phone,String email) {
super();
this.id=id;
this.Contactor=contactor;
this.Address=address;
this.Phone=phone;
this.email=email;
}

}

5.com.inter里面 接口：

package com.inter;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.bean.Address;

public interface AddressDao {
@Insert("insert into address(Contactor,Address,Phone,email) values(#{Contactor},#{Address},#{Phone},#{email})")//自动映射
int insert(Address address);

@Select("select * from address")
List<Address> select();

@Update("update address set Contactor=#{Contactor},Address=#{Address},Phone=#{Phone},email=#{email} where id=#{id}")
int update(Address address);

@Delete("delete from address where id=#{id}")
int delete(Address address);
}

6.servlet中增删改查

代码如下：
InsertServlet:

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String contactor = request.getParameter("contactor");
String address = request.getParameter("address");
String phone = request.getParameter("phone");
String email = request.getParameter("email");
Address a=new Address(0, contactor, address, phone, email);
SqlSession session= DButil.getSession(true);
AddressDao dao=session.getMapper(AddressDao.class);
dao.insert(a);
session.close();
response.sendRedirect("SelectServlet");
}

DeleteServlet:

protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
SqlSession session= DButil.getSession(true);
AddressDao dao=session.getMapper(AddressDao.class);
int id=Integer.parseInt(request.getParameter("id"));
Address a=new Address();
a.setId(id);
dao.delete(a);
request.setAttribute("a", a);
request.getRequestDispatcher("SelectServlet").forward(request, response);
}

UpdateServlet:

protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("aaaa");
int id=Integer.parseInt(request.getParameter("id"));
String contactor = request.getParameter("contactor");
String address = request.getParameter("address");
String phone = request.getParameter("phone");
String email = request.getParameter("email");
Address a=new Address(id, contactor, address, phone, email);
SqlSession session= DButil.getSession(true);
AddressDao dao=session.getMapper(AddressDao.class);
dao.update(a);
//List<Address> list=dao.select();
//request.setAttribute("list", list);
request.getRequestDispatcher("show.jsp").forward(request, response);

}

SelectServlet:

protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
SqlSession session=DButil.getSession(true);
AddressDao dao=(AddressDao)session.getMapper(AddressDao.class);
List<Address> list=dao.select();
session.close();
request.setAttribute("list", list);
request.getRequestDispatcher("index.jsp").forward(request, response);
}

6.相关jsp文件：
index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="SelectServlet" method="post">
<table align="center" border="1" width="70%" >
<caption><a href="xxlr.jsp">添加联系人</a></caption>
<tr>
<td>序号</td>
<td>联系人</td>
<td>联系人地址</td>
<td>联系电话</td>
<td>E-Mail</td>
<td>删除</td>
</tr>
<c:forEach items="${list}" var="a" varStatus="s">
<tr>
<td>${s.count}</td>
<td>${a.contactor}</td>
<td>${a.address}</td>
<td>${a.phone}</td>
<td>${a.email}</td>
<td><a href="DeleteServlet?id=${a.id}">删除</a></td>
</tr>
</c:forEach>
</table>
</form>
</body>
</html>

update.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>update</title>
</head>
<body>
<form action="UpdateServlet"  method="get">
<table align="center" border="1" width="70%" >
<caption>更新联系人</caption>
<tr>
<td>序号</td>
<td>联系人</td>
<td>联系人地址</td>
<td>联系电话</td>
<td>E-Mail</td>
</tr>
<tr>
<td><input type="text" name="id" value="${a.id }"></td>
<td><input type="text" name="contactor" value="${a.contactor }"></td>
<td><input type="text" name="address" value="${a.address }"></td>
<td><input type="text" name="phone" value="${a.phone }"></td>
<td><input type="text" name="email" value="${a.email }"></td>
</tr>
<tr><td colspan="5"><input type="submit" value="修改"></td></tr>
</table>
</form>
</body>
</html>

userwrite.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>添加用户</title>
<script type="text/javascript">
function check(){
var contactor=document.getElementById("contactor").value;
var address=document.getElementById("address").value;
var phone=document.getElementById("phone").value;
var email=document.getElementById("email").value;
if(contactor==""){
document.getElementById("spancontactor").innerHTML="联系人不能为空";
}else if(address==""){
document.getElementById("spanaddress").innerHTML="地址不能为空";
}else if(phone==""){
document.getElementById("spanphone").innerHTML="电话不能为空";
}else if(email==""){
document.getElementById("spanemail").innerHTML="邮箱不能为空";
}else if(email.indexOf("@")==-1){
document.getElementById("spanemail").innerHTML="邮箱必须有@";
}else{
document.form1.submit();
}
}
</script>
</head>
<body>
<form action="InsertServlet" method="post" name="form1">
<table align="center">
<tr>
<td>联系人:</td>
<td><input name="contactor" id="contactor"></td>
<td><span id="spancontactor" style="color:red"></span></td>
</tr>
<tr>
<td>联系人地址:</td>
<td><input name="address" id="address"></td>
<td><span id="spanaddress" style="color:red"></span></td>
</tr>
<tr>
<td>电话:</td>
<td><input name="phone" id="phone"></td>
<td><span id="spanphone" style="color:red"></span></td>
</tr>
<tr>
<td>E-Mail:</td>
<td><input name="email" id="email"></td>
<td><span id="spanemail" style="color:red"></span></td>
</tr>
<tr>
<td colspan="3"><input type="button" value="添加联系人" onclick="check()"></td>
</tr>
</table>
</form>
</body>
</html>

然后就是自己准备数据库。这就不过多展示了大家都会，以上就能实现简单的增删改查功能.

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