SpringBoot @RequestBody 中文乱码

今天突然想学习一下Restful风，详细的我就不赘述了，我的理解是同一个请求路径根据请求方式不同进行不同的处理

如四种提交方式

GET（SELECT）：从服务器查询，可以在服务器通过请求的参数区分查询的方式。  
POST（CREATE）：在服务器新建一个资源，调用insert操作。  
PUT（UPDATE）：在服务器更新资源，调用update操作。  
DELETE（DELETE）：从服务器删除资源，调用delete语句

下面进行实践

前端简易代码

<a href="#" onclick="add()">添加</a>
<a href="#" onclick="del()">删除</a>
<a href="#" onclick="select()">查询</a>
<a href="#" onclick="update()">修改</a>

<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
    function add(){
    var id = "111111111";
        $.ajax({
            type:"POST",
            url:"test.do",
            data:{id:"添加11111111111"}});
    }


    function del(){
   var id = "2222222";
        $.ajax({
            type:"DELETE",
            url:"test.do",
            data:{id:"删除22222222222"},
             contentType : "text/html;charset=UTF-8",
            dataType:"json"});
    }

     function select(){
    var id = "33333";
        $.ajax({
            type:"GET",
            url:"test.do",
            data:{id:"查询3333333333"}});
    }

     function update(){
    var id = "111111111";
        $.ajax({
            type:"PUT",
            url:"test.do",
            data:{id:"修改4444444"}});
    }
</script>

后台简易代码

@RequestMapping(value = "/test.do", method = RequestMethod.DELETE)
    public void test(String id){
        System.out.println("删除");
        System.out.println(id);
    }

    @RequestMapping(value = "/test.do", method = RequestMethod.POST)
    public void test1(String id){
        System.out.println("添加");
        System.out.println(id);
    }

    @RequestMapping(value = "/test.do", method = RequestMethod.PUT)
    public void test2(String id){
        System.out.println("修改");
        System.out.println(id);
    }

    @RequestMapping(value = "/test.do", method = RequestMethod.GET)
    public void test3(String id){
        System.out.println("查询");
        System.out.println(id);
    }

前台ajax的提交方式对应于后台@RequestMapping(value = "/test.do", method = RequestMethod.方式)

控制台：

添加
添加11111111111
2018-10-26 09:28:45.325 DEBUG 8500 --- [nio-8080-exec-4] o.s.b.w.f.OrderedRequestContextFilter    : Cleared thread-bound request context: org.apache.catalina.connector.RequestFacade@718e55d2
2018-10-26 09:28:45.977 DEBUG 8500 --- [nio-8080-exec-8] o.s.b.w.f.OrderedRequestContextFilter    : Bound request context to thread: org.apache.catalina.connector.RequestFacade@718e55d2
删除
null
2018-10-26 09:28:45.984 DEBUG 8500 --- [nio-8080-exec-8] o.s.b.w.f.OrderedRequestContextFilter    : Cleared thread-bound request context: org.apache.catalina.connector.RequestFacade@718e55d2
2018-10-26 09:28:46.731 DEBUG 8500 --- [nio-8080-exec-9] o.s.b.w.f.OrderedRequestContextFilter    : Bound request context to thread: org.apache.catalina.connector.RequestFacade@718e55d2
查询
查询3333333333
2018-10-26 09:28:46.734 DEBUG 8500 --- [nio-8080-exec-9] o.s.b.w.f.OrderedRequestContextFilter    : Cleared thread-bound request context: org.apache.catalina.connector.RequestFacade@718e55d2
2018-10-26 09:28:47.585 DEBUG 8500 --- [nio-8080-exec-5] o.s.b.w.f.OrderedRequestContextFilter    : Bound request context to thread: org.springframework.web.filter.HttpPutFormContentFilter$HttpPutFormContentRequestWrapper@535448c
修改
修改4444444
2018-10-26 09:28:47.590 DEBUG 8500 --- [nio-8080-exec-5] o.s.b.w.f.OrderedRequestContextFilter    : Cleared thread-bound request context: org.springframework.web.filter.HttpPutFormContentFilter$HttpPutFormContentRequestWrapper@535448c

可见Restful已经根据不同的提交方式进入不同的方法了，后面大家就可以自行处理了，但是还有一个问题，当提交方式为DELETE时，接收的id值为null

在参数列表中加入@RequestBody注解，这里的作用是通过@requestBody可以将请求体中的JSON字符串绑定到相应的bean上，也可以将其分别绑定到对应的字符串上。

 @RequestMapping(value = "/lll.do", method = RequestMethod.DELETE)
    public void test(@RequestBody String id){
        System.out.println("删除");
        System.out.println(id);
    }

控制台：

2018-10-26 10:31:09.661 DEBUG 2720 --- [nio-8080-exec-1] o.s.b.w.f.OrderedRequestContextFilter    : Bound request context to thread: org.apache.catalina.connector.RequestFacade@4bafd197
删除
id=%E5%88%A0%E9%99%A422222222222
2018-10-26 10:31:09.667 DEBUG 2720 --- [nio-8080-exec-1] o.s.b.w.f.OrderedRequestContextFilter    : Cleared thread-bound request context: org.apache.catalina.connector.RequestFacade@4bafd197

可以看到，是可以获取到数据了，但是会出现中文乱码，这个中文乱码超级顽固，设置了很多都没用，最后在前台这样设置就可以了

 function del(){
   var id = "删除sssss22222222222";
        $.ajax({
            type:"DELETE",
            url:"lll.do",
            data:JSON.stringify(id),
            contentType :"application/json",
            dataType:"json"});
    }

这样控制台的输出就变成了：

2018-10-26 13:42:59.585 DEBUG 8364 --- [nio-8080-exec-7] o.s.b.w.f.OrderedRequestContextFilter    : Bound request context to thread: org.apache.catalina.connector.RequestFacade@343dbcb6
删除
"删除sssss22222222222"
2018-10-26 13:42:59.587 DEBUG 8364 --- [nio-8080-exec-7] o.s.b.w.f.OrderedRequestContextFilter    : Cleared thread-bound request context: org.apache.catalina.connector.RequestFacade@343dbcb6

SpringBoot @RequestBody 中文乱码

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