Spring MVC和jQuery的产生415错误

Question

我有以下的jQuery

<script> 
var response = ''; 
$.ajax({ type: "POST", 
    url: "http://localhost:8080/hsv06/checkUserExists", 
    async: false, 
    data: "title=foo", 
    success : function(text) 
    { 
     response = text; 
    } 
}); 

console.log(response); 
</script> 

这里是休息控制器：

@RequestMapping(value="/checkUserExists", method=RequestMethod.POST, consumes="application/json") 
public @ResponseBody boolean checkUser(@RequestBody Object title){ 
    System.out.println(title); 
    return true;   
} 

然而，这产生以下错误：

POST http://localhost:8080/hsv06/checkUserExists 415 (Unsupported Media Type) 
send @ jquery.min.js:2 
ajax @ jquery.min.js:2 
(anonymous) @ (index):57 

什么问题是什么？我发送数据的方式有什么问题？

Answer 1

415表示不支持的媒体类型。你的服务器使用application/json，所以你的客户端必须提供application/json数据。要修复它，只需将类型添加到您的jQuery中，如下所示。

$.ajax({ type: "POST", 
    url: "http://localhost:8080/hsv06/checkUserExists", 
    async: false, 
    data: JSON.stringify({title: "food"}), 
    // specifying data type 
    contentType: "application/json; charset=utf-8", 
    success : function(text) 
    { 
     response = text; 
    } 
}); 

contentType (default: 'application/x-www-form-urlencoded; charset=UTF-8')

When sending data to the server, use this content type. Default is "application/x-www-form-urlencoded; charset=UTF-8"

你的弹簧安置后端应该像下面这样。由于发布的数据是{title：“food”}，Spring会将其解析为Map。

@RequestMapping(value="/checkUserExists", method=RequestMethod.POST, consumes="application/json") 
public @ResponseBody boolean checkUser(@RequestBody Map<String, String> param){ 
    System.out.println(param); 
    return true;   
}