SpringMVC实现RESTful服务

原贴地址：http://blog.csdn.net/zbw18297786698/article/details/53946201

1、SpringMVC实现RESTful服务

1. SpringMVC原生态的支持了REST风格的架构设计。
2. 所涉及到的注解和类

• @RequestMapping
• @PathVariable
• @ResponseBody
• ResponseEntity
  
• HttpStatus
  
• ……

2、查询资源

     2.1 查询资源的代码实现

@RequestMapping(value = "{id}", method = RequestMethod.GET)
    public ResponseEntity queryUserById(@PathVariable("id") Long id) {
        try {
            User user = this.userService.queryUserById(id);
            if (null == user) {
                // 资源不存在 404
                return ResponseEntity.status(HttpStatus.NOT_FOUND).body(null);
            }
            // 资源存在 200
            return ResponseEntity.status(HttpStatus.OK).body(user);
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 出现异常，服务器内部错误
        // 500
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(null);
    }

     2.2 查询资源的测试

           要查询的资源存在

           

           要查询的资源不存在

         

     2.3 使用忽略@JsonIgnore,在返回User时，忽略密码属性的信息

           

3、新增资源

3.1新增资源的代码实现

/**
     * 新增资源
     *
     * @param user
     * @return
     */
    @RequestMapping(method = RequestMethod.POST)
    public ResponseEntity saveUser(User user) {
        try {
            this.userService.saveUser(user);
            return ResponseEntity.status(HttpStatus.CREATED).build();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 出现异常，服务器内部错误
        // 500
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(
                null);
    }

3.2新增资源的测试

                 

4、更新资源

       4.0 默认情况下，PUT请求是无法提交表单数据的，需要在web.xml中添加过滤器解决

<filter>
    <filter-name>HttpMethodFilterfilter-name>
    <filter-class>org.springframework.web.filter.HttpPutFormContentFilterfilter-class>
filter>
<filter-mapping>
    <filter-name>HttpMethodFilterfilter-name>
    <url-pattern>/*url-pattern>
filter-mapping>

4.1 更新资源的代码实现

/**
     * 修改资源
     *
     * @param user
     * @return
     */
    @RequestMapping(method = RequestMethod.PUT)
    public ResponseEntity updateUser(User user) {
        try {
            this.userService.updateUser(user);
            // 204
            return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 出现异常，服务器内部错误
        // 500
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(
                null);
    }

4.2 更新资源的测试

   

5、删除资源

       5.0 默认情况下，Delete请求是无法提交表单数据的，需要在web.xml中添加过滤器解决

    <filter>
        <filter-name>HiddenHttpMethodFilterfilter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilterfilter-class>
    filter>
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilterfilter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>

5.1删除资源的代码实现

/**
     * 删除资源
     *
     * @param user
     * @return
     */
    @RequestMapping(method = RequestMethod.DELETE)
    public ResponseEntity deleteUser(
            @RequestParam(value = "id", defaultValue = "0") Long id) {
        try {
            this.userService.deleteById(id);
            // 204
            return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 出现异常，服务器内部错误
        // 500
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(
                null);
    }

5.2 删除资源的测试

       

6、完整的实现代码

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
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.RequestParam;
import cn.itcast.user.pojo.User;
import cn.itcast.user.service.UserService;

@RequestMapping("new/user")
@Controller
public class RestUserController {

    @Autowired
    private UserService userService;

    @RequestMapping(value = "{id}", method = RequestMethod.GET)
    public ResponseEntity queryUserById(@PathVariable("id") Long id) {
        try {
            User user = this.userService.queryUserById(id);
            if (null == user) {
                // 资源不存在 404
                return ResponseEntity.status(HttpStatus.NOT_FOUND).body(null);
            }
            // 资源存在 200
            return ResponseEntity.status(HttpStatus.OK).body(user);
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 出现异常，服务器内部错误
        // 500
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(
                null);
    }

    /**
     * 新增资源
     *
     * @param user
     * @return
     */
    @RequestMapping(method = RequestMethod.POST)
    public ResponseEntity saveUser(User user) {
        try {
            this.userService.saveUser(user);
            // 201
            return ResponseEntity.status(HttpStatus.CREATED).build();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 出现异常，服务器内部错误
        // 500
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(
                null);
    }

    /**
     * 修改资源
     *
     * @param user
     * @return
     */
    @RequestMapping(method = RequestMethod.PUT)
    public ResponseEntity updateUser(User user) {
        try {
            this.userService.updateUser(user);
            // 204
            return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 出现异常，服务器内部错误
        // 500
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(
                null);
    }

    /**
     * 删除资源
     *
     * @param user
     * @return
     */
    @RequestMapping(method = RequestMethod.DELETE)
    public ResponseEntity deleteUser(
            @RequestParam(value = "id", defaultValue = "0") Long id) {
        try {
            this.userService.deleteById(id);
            // 204
            return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 出现异常，服务器内部错误
        // 500
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(
                null);
    }
}

7、源码下载