controller :

package com.bude.ww.controller;

import com.bude.ww.model.BaseResponse;
import com.bude.ww.model.User;
import com.bude.ww.services.UserService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * Created by andy on 2016/6/1.
 */
@RestController
@RequestMapping("users")
public class UserController {
    Logger logger= LoggerFactory.getLogger(UserController.class);
    private BaseResponse resp;
    @Autowired
    private UserService userService;
    @RequestMapping(method = RequestMethod.POST)
    public Object add(User user){
        logger.info("add");
        userService.addUser(user);
        return user;
    }

    @RequestMapping(method = RequestMethod.PUT)
    public Object update(User user){
        user = userService.updateUser(user);
        return resp;
    }
    @RequestMapping(value = "{id}",method = RequestMethod.DELETE)
    public Object delete(@PathVariable("id") Integer id){
        Boolean ret = userService.deleteUser(id);
        return ret;
    }
    @RequestMapping(value = "{id}",method = RequestMethod.GET)
    public Object get(@PathVariable("id") Integer id){
        logger.info("get "+id);
        User user = userService.getUser(id);
        return user;
    }
    @RequestMapping(method = RequestMethod.GET)
    public Object getAll(){

        return resp;
    }
}

public interface UserService {

    User addUser(User user);
    User updateUser(User user);
    Boolean deleteUser(Integer id);
    User getUser(Integer id);
    List<User> getUserAll();
}

package com.bude.ww.services;

import com.bude.ww.DAO.UseDao;
import com.bude.ww.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * Created by andy on 2016/6/1.
 */
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UseDao userDao;
    @Override
    public User addUser(User user) {
        return userDao.add(user);
    }

    @Override
    public User updateUser(User user) {
        return userDao.update(user);
    }

    @Override
    public Boolean deleteUser(Integer id) {
        int ret = userDao.delete(id);
        return ret>0?Boolean.TRUE:Boolean.FALSE;
    }

    @Override
    public User getUser(Integer id) {

        return userDao.get(id);
    }

    @Override
    public List<User> getUserAll() {
        return null;
    }
}

package com.bude.ww.DAO;

import com.bude.ww.UserMapper;
import com.bude.ww.model.User;
import org.apache.ibatis.session.SqlSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

/**
 * Created by andy on 2016/6/5.
 */
@Repository
public class UserDao {
    @Autowired
    private SqlSession sqlSession;

    public UserMapper getMapper(){
        return sqlSession.getMapper(UserMapper.class);
    }
    public User add(User user){
        int ret = getMapper().insert(user);
        if(ret > 0){

        }
        return user;
    }

    public User update(User user){
        int ret = getMapper().updateByPrimaryKey(user);
        if(ret > 0){

        }
        return user;
    }
    public User get(Integer userId){
        User ret = getMapper().selectByPrimaryKey(userId);

        return ret;
    }
    public int delete(Integer  userId){
        int ret = getMapper().deleteByPrimaryKey(userId);
        if(ret > 0){

        }
        return ret;
    }
}

sevlet 配置：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <context:annotation-config/>
    <mvc:annotation-driven>
    </mvc:annotation-driven>
    <context:component-scan base-package="com.bude.ww"/>

    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
    <bean class = "org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <array>
                <bean class = "org.springframework.http.converter.StringHttpMessageConverter">
                    <property name="supportedMediaTypes" value = "text/plain;charset=UTF-8" />
                </bean>
            </array>
        </property>
    </bean>
    <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">

        <property name="contentNegotiationManager" ref="cnManager"/>

    </bean>
    <bean id="cnManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
        <property name="ignoreAcceptHeader" value="true"/>
        <property name="defaultContentType" value="text/json" />
    </bean>
</beans>