03点睛Spring MVC 4.1-REST

转发：https://www.iteye.com/blog/wiselyman-2214290

3.1 REST

REST:Representational State Transfer;
REST是一种数据导向web service,相对于SOAP是一种操作操作和处理导向的web service;
Spring为对REST的支持提供了@RestController;
- 在没有@RestController可以通过@Controller,@ResponseBody组合实现REST控制器;
- 但是我们经常会使用@ResponseBody这样很麻烦,且易忘记;
- 使用@RestController替代@Controller,我们就不用使用@ResponseBody;
REST支持的http method(通过@RequestMapping的method属性控制)
- POST:新增
- GET:读取
- PUT/PATCH:更新
- DELETE:删除
produces的内容是指定返回的媒体类型让浏览器识别
- 如返回text/plain的话,浏览器上的js回掉拿到的是字符串,需要自己转换对象;
- 如返回application/json的话,浏览器上的js拿到的就是js对象而不是字符串,就不需要进行转换;
本例演示向控制器提交json数据,返回结果分别为json和xml格式;

3.2 示例

3.2.1 @RestController源码

从@RestController看出,@RestController是一个元注解,组合了@Controller,@ResponseBody,相当于同时使用了@Controller @ResponseBody

@Target(ElementType.TYPE)

@Retention(RetentionPolicy.RUNTIME)

@Documented

@Controller

@ResponseBody

public @interface RestController {

    /**

     * The value may indicate a suggestion for a logical component name,

     * to be turned into a Spring bean in case of an autodetected component.

     * @return the suggested component name, if any

     * @since 4.0.1

     */

    String value() default "";

}

3.2.2 代码

添加jackson依赖

jackson-dataformat-xml依赖jackson-bind,这样我们能同时返回xml和json

<dependency>

    <groupId>com.fasterxml.jackson.dataformat</groupId>

    <artifactId>jackson-dataformat-xml</artifactId>

    <version>2.5.3</version>

</dependency>

若只需返回json数据(大多数项目都是这样),将上面依赖更换为

 <dependency>

    <groupId>com.fasterxml.jackson.core</groupId>

    <artifactId>jackson-databind</artifactId>

    <version>2.5.3</version>

</dependency>

传值对象

package com.wisely.web;

public class DemoObj {

    private Long id;

    private String name;

    //此处一定要有空构造,不然会有400 bad request,主要是jackson将json参数转换为对象需要

    public DemoObj() {

        super();

    }

    public DemoObj(Long id, String name) {

        super();

        this.id = id;

        this.name = name;

    }

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

}

DemoMVCConfig注册静态资源

    // 静态资源映射

    @Override

    public void addResourceHandlers(ResourceHandlerRegistry registry) {

        registry.addResourceHandler("/js/**").addResourceLocations("/js/");

    }

控制器

package com.wisely.web;

import org.springframework.web.bind.annotation.RequestBody;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

@RequestMapping("/api")

public class RESTController {

    @RequestMapping(value = "/getjson",produces={"application/json;charset=UTF-8"})

    public DemoObj getjson(@RequestBody DemoObj obj){

        return new DemoObj(obj.getId()+1, obj.getName()+"yy");

    }

    @RequestMapping(value = "/getxml",produces={"application/xml;charset=UTF-8"})

    public DemoObj getxml(@RequestBody DemoObj obj){

        return new DemoObj(obj.getId()+1, obj.getName()+"yy");

    }

}

页面代码

<script type="text/javascript" src="<c:url value="/js/jquery.js" />"></script>

<script type="text/javascript">

var json = {"id":456,"name":"phy"};

$.ajax({

      url: "api/getjson",

      data: JSON.stringify(json),

      type:"POST",

      contentType:"application/json",

      success: function(data){

          console.log(data);

      }

    });

$.ajax({

      url: "api/getxml",

      data: JSON.stringify(json),

      type:"POST",

      contentType:"application/json",

      success: function(data){

          console.log(data);

      }

    });

</script>

结果

巴特西

03点睛Spring MVC 4.1-REST

3.1 REST

3.2 示例

3.2.1 @RestController源码

3.2.2 代码

最新文章

热门文章