解决@RequestBody接收json对象报错415的问题

$.ajax({
            url: basePath() + "/index/login.do",
            type : "post",
            data: JSON.stringify(form),
            dataType : "json",
            contentType : "application/json;charset=utf8",
            success: function (data) {
                console.log(data);
            },
            error: function () {
 
            }
        });

@ResponseBody
 @RequestMapping(value = "/login",method = RequestMethod.POST,produces = "application/json;charset=utf8")
 public JSONObject login(@RequestBody LoginVo loginVo){
 
  JSONObject result = new JSONObject();
  UsernamePasswordToken token = new UsernamePasswordToken(loginVo.getUsername(),loginVo.getPassword());
  System.out.println(loginVo.isRememberMe());
  Subject subject = SecurityUtils.getSubject();
  subject.login(token);
  if (subject.isAuthenticated()){
   result.put("result",true);
  }else{
   result.put("result",false);
  }
  return result;
 }

<dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.6</version>
        </dependency>
 
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.6</version>
        </dependency>
 
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.6</version>
        </dependency>

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <!-- 设置返回字符串编码 -->
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                    <property name = "supportedMediaTypes">
                        <list>
                            <value>text/html;charset=UTF-8</value>
                            <value>application/json;charset=UTF-8</value>
                        </list>
                    </property>
                </bean>
                <!-- json转换器 -->
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                    <property name="supportedMediaTypes">
                        <list>
                            <value>text/html;charset=UTF-8</value>
                            <value>application/json;charset=UTF-8</value>
                        </list>
                    </property>
                </bean>
            </list>
        </property>
    </bean>

type: “post”,
url: ctx + url,
data: JSON.stringify(allData),
dataType: “json”,
contentType:“application/json;charset=utf-8”,