Spring方法的增删改查例子

步骤
新建project,然后新建所需要的包
在web下新建lib文件夹，将需要的jar包导入lib里
源代码
User.java
private int id;
private String username;
private String password;

UserDao.java
package com.zhongruan.dao.impl;

import com.zhongruan.bean.User;
import com.zhongruan.dao.IuserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;

import java.util.List;

@Component
public class UserDao implements IuserDao {
@Autowired
private JdbcTemplate jdbcTemplate;

@Override
public List<User> findAll() {
    String sql="select * from tb_user";
    BeanPropertyRowMapper<User> rowMapper=new BeanPropertyRowMapper<>(User.class);
    List<User> users=jdbcTemplate.query(sql,rowMapper);
    return users;
}

@Override
public void delete(int id) {
    String sql="delete from tb_user where id=?";
    jdbcTemplate.update(sql,id);
}

@Override
public void update(int id, String username, String password) {
    String sql="update tb_user set username=?,password=? where id=?";
    jdbcTemplate.update(sql,id,username,password);
}

@Override
public void add(String username, String password) {
    String sql="insert into tb_user(username,password) values (?,?)";
    jdbcTemplate.update(username,password);
}

}

UserService.java
@Service
public class UserService implements IUserService {
@Autowired
private UserDao userDao;
@Override
public List findAll() {
List users=userDao.findAll();
return users;
}
@Override
public void delete(int id) {
userDao.delete(id);
}
@Override
public void update(int id, String username, String password) {
userDao.update(id,username,password);
}
@Override
public void add(String username, String password) {
userDao.add(username,password);
}
}

IUserDao \ IUserService
package com.zhongruan.dao;
import com.zhongruan.bean.User;
import java.util.List;

public interface IuserDao {
List findAll();
void delete(int id);
void update(int id,String username,String password);
void add(String username, String password);
}

spring.xml

<bean id="user" class="com.zhongruan.bean.User">
    <property name="id" value="1"></property>
    <property name="username" value="hualili"></property>
    <property name="password" value="123"></property>
</bean>

<context:component-scan base-package="com.zhongruan"></context:component-scan>

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
    <property name="url" value="jdbc:mysql://127.0.0.1:3306/zjgm?characterEncoding=utf-8"></property>
    <property name="username" value="root"></property>
    <property name="password" value="123456"></property>
</bean>

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource"></property>
</bean>

Test.java
public class Test {
public static void main(String[] args){
// User user=new User();
// user.setUsername(“hualili”);
// user.setPassword(“123”);

// IUserService userService=new UserService();
// userService.findAll();
ApplicationContext context=new ClassPathXmlApplicationContext(“spring.xml”);
// IUserService userService=(IUserService)context.getBean(“userService”);
// userService.findAll();

// User user=(User) context.getBean(“user”);
// user.setUsername(“hualili”);
// user.setPassword(“123”);
// System.out.println(user);

// UserDao userDao= (UserDao) context.getBean(“userDao”);
// List users=userDao.findAll();
// userDao.delete(11);
// System.out.println(users);

    IUserService userService= (IUserService) context.getBean("userService");
    userService.delete(5);
    System.out.println(userService.findAll());
}

}