SpringMVC 构建Restful风格 及问题处理

基本的请求URL：

/person/{id}  GET 　　　　得到id的person

/person　　 POST　　      新增person

/person/{id}  PUT 　　　　 更新id的person

/person/{id}  DELETE 　　 删除id的person

源码地址：https://github.com/loveincode/ssm

1. 查询 GET

@RequestMapping(value = "/{id}", method = RequestMethod.GET)

 @RequestMapping(value = "/{id}", method = RequestMethod.GET)
     public @ResponseBody String show(@PathVariable Integer id, HttpServletRequest request,
             HttpServletResponse response) {
         log.info("ENTER " + ToolsUtil.getMethodName());
         ResultVO resultVO = new ResultVO();
         Person person = new Person();
         person = personService.findById(id);
         if (person != null) {
             resultVO.setSuccess(true);
             resultVO.setData(person);
             resultVO.setMessage("查询成功");
         } else {
             resultVO.setMessage("查询失败，没找到id=" + id + "的Person");
         }
         return resultVO.toString();
     }

测试：

2. 新增 POST

@RequestMapping(method = RequestMethod.POST)

 @RequestMapping(method = RequestMethod.POST)
     public @ResponseBody String add(@ModelAttribute("person") Person person, HttpServletRequest request,
             HttpServletResponse response) {
         ResultVO resultVO = new ResultVO();
         System.out.println(person.toString());
         if (person.getName() != null) {
             personService.add(person);
             resultVO.setSuccess(true);
             resultVO.setMessage("插入成功");
         } else {
             resultVO.setMessage("name为空，插入失败");
         }
         return resultVO.toString();
     }

测试：

3. 更新 PUT

@RequestMapping(value = "/{id}", method = RequestMethod.PUT)

@RequestMapping(value = "/{id}", method = RequestMethod.PUT)
    @ResponseBody
    public String update(@PathVariable Integer id, @ModelAttribute("person") Person person, HttpServletRequest request,
            HttpServletResponse response) {
        ResultVO resultVO = new ResultVO();
        Person oldperson = personService.findById(id);
        if (oldperson != null) {
            if (person.getName() != null) {
                person.setId(oldperson.getId());
                personService.update(person);
                resultVO.setMessage("更新成功");
            } else {
                resultVO.setMessage("更新失败，name为空");
            }
        } else {
            resultVO.setMessage("更新失败，不存在 id = " + id + "的Person");
        }
        return resultVO.toString();
    }

测试：

4. 删除 DELETE

@RequestMapping(value = "/{id}", method = RequestMethod.DELETE)

 @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
     @ResponseBody
     public String delete(@PathVariable Integer id, HttpServletRequest request, HttpServletResponse response) {
         ResultVO resultVO = new ResultVO();
         Person person = new Person();
         person = personService.findById(id);
         if (person != null) {
             resultVO.setSuccess(true);
             personService.delete(id);
             resultVO.setMessage("删除成功");
         } else {
             resultVO.setMessage("删除失败，不存在id = " + id + "的Person");
         }
         return resultVO.toString();
     }

测试：

5. 问题

5.1 SpringMVC接收不了PUT、DELETE  bodydata 解决方法

需要在web.xml中加上：

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

然后在请求PUT、DELETE的时候，使用POST请求，在body中加入_method 参数，参数为PUT或DELETE，即可完成对PUT、DELETE的处理。

例如：

strtus2 构建restful风格 https://www.ibm.com/developerworks/cn/java/j-lo-struts2rest/