java - Spring 3.0 MVC Ajax 示例

Question

我正在尝试将 Ajax 请求发送到 Spring MVC Controller 并将其相应地映射到 Java 类:

public class Person  implements Serializable {
    private MutableLong Id = new MutableLong();
    @NotEmpty
    @Size(min = 1, max = 50)
        String FirstName=null;
        @NotEmpty
        @Size(min = 1, max = 50)
        String LastName=null;
        public Person(){}
        public long getId(){
            return this.Id.longValue();
        }
   //getters and setters
} 

然后我有发送 AJAX 请求的 JavaScript:

function loadXMLDoc(){
    if(window.ActiveXObject)
    {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    else if(window.XMLHttpRequest)
    {
      xmlHttp=new XMLHttpRequest();
    }
    xmlHttp.onreadystatechange=handleStateChange;
    xmlHttp.open("POST","/authenticate.dlp", true);
    xmlHttp.setRequestHeader('Content-Type', 'application/json');
    param = '{\"FirstName\"=\"test\",\"LastName\"=\"test2\"}';
    xmlHttp.send(param);
}

然后是 Controller 本身:

@RequestMapping(value="/authenticate.dlp",method = RequestMethod.POST)
         @ResponseBody
          public String getAjax(@RequestBody Person person){
          Set<ConstraintViolation<Person>> failures = validator.validate(person);
          if(!failures.isEmpty())
    //......     
      }

看起来服务器没有响应。如果我使用的是 Fiddler，我会看到来自服务器的以下响应:

The server refused this request because the request entity is in a format not supported by the requested resource for the requested method ().

我做错了什么？

Answer 1

有两个可能的原因:

• 你忘了<mvc:annotation-driven /> .它自动配置 HTTP 消息转换器以用于 @RequestBody/@ResponseBody
• 你没有 Jackson JSON Processor在类路径中。 Spring 要求它绑定(bind) application/json至 @RequestBody