SpringMVC ajax json 415

415 JSON 解析错误。

可能的原因：没有解析的jar包；JSON 数据格式错误。

pom.xml  json jar包

<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-annotations</artifactId>
  <version>2.9.2</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-core</artifactId>
  <version>2.9.2</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.9.2</version>
</dependency>

方法一：

$.ajax({
    url:"/testJson1",
    type:"POST",
    data:{
        id:1,
        name:"name",
        sn:"sn"
    },
    success:function (result) {
        $("#dataContainer").html(JSON.stringify(result));
    }
});

@RequestMapping("/testJson1")
@ResponseBody
public Book testJson1(Book book){
    System.out.println(JSON.toJSONString(book));
    return book;
}

方法二： 

指定contentType:"application/json;charset=UTF-8" 

Controller短需指定@RequestBody     json数据格式去解析

var data = '{"id":"1", "name": "Brett", "sn":"12" }';
$.ajax({
    url:"/testJson3",
    type:"post",
    data:data,
    contentType:"application/json;charset=UTF-8",
    dataType:"json",
    success:function (result) {
        $("#dataContainer").html(JSON.stringify(result));
    }
});

@RequestMapping("/testJson3")
@ResponseBody
public String testJson3(@RequestBody Book book){
    System.out.println(JSON.toJSONString(book));
    return JSON.toJSONString(book);
}