Spring MVC @RequestBody 不能与 jquery ajax 一起使用？

Question

这是我的ajax请求

var dataModel = {name1:"value1", name2:"value2"};

$.ajax({
              url: "/testURL",
              type: "POST",
              async: false,
              contentType: "application/json",
              data: dataModel,
              success: function(response) {

              }

    })

这是我来自 spring xml 的相关 sn-p

<annotation-driven>
        <!-- Message converters are added to use custom object mapper in  MappingJackson2HttpMessageConverter.
            StringHttpMessageConverter is required to avoid MappingJackson2HttpMessageConverter from converting a string into json.
        -->
        <message-converters>
            <beans:bean
                class="org.springframework.http.converter.StringHttpMessageConverter">
            </beans:bean>
            <beans:bean
                class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <beans:property name="objectMapper" ref="jacksonObjectMapper"/>
            </beans:bean>
        </message-converters>
    </annotation-driven>

这是我的控制器映射

    @RequestMapping(value = "/testURL", method = { RequestMethod.POST })
    public String add(HttpServletRequest request, @RequestBody CustomObject customObject) throws Exception {}

但我的请求甚至没有到达控制器。只要我删除@RequestBody CustomObject customObject，它就会起作用。但我想将 json 请求映射到 @RequestBody 的 CustomObject 没有发生。 不确定我在这里缺少什么？

事实上，当我检查 request.getParameterMap() 时，它显示为空，但一旦我删除 contentType: "application/json"，我看到参数映射被填充但仍然 然后得到以下错误

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

这是我的 CustomObject 定义

public class CustomObject implements Serializable {

private static final long serialVersionUID = 1L;
private String name1;
private String name2;

//getters and setters
}

已经通过JQuery, Spring MVC @RequestBody and JSON - making it work together但没有帮助

Answer 1

事实上，当我检查 request.getParameterMap() 它显示为空但 一旦我删除 contentType: "application/json"

没错。原因是contentType: "application/json" jquery 在内部将数据转换为字符串。所以没有请求参数。没有contentType: "application/json"，默认contentType' is form data . So data sent is converted to request parameters based on delimiters&and=`

也可以试试data: JSON.stringify(dataModel)，它应该可以工作