restTemplate发送post请求时报错

这个是我发送请求的代码部分逻辑

  public String  getPortInfo(String hostName){
        PortInfo portInfo =new PortInfo();
        MultiValueMap<String, String> paramMap = new LinkedMultiValueMap<>();
        portInfo.setHostName(hostName);
        portInfo.setIp("8762");
        paramMap.add("reqData", JSONObject.toJSONString(portInfo));
        String url = "http://ribbon-provider/reqportinfo";
        String  res  = restTemplate.postForObject(url, paramMap, String.class);
        System.out.println("responsepost json : " + JSONObject.toJSONString(res));
        return res;
    };

这个是接收post请求的代码部分逻辑

    @RequestMapping(value = "/reqportinfo", method = RequestMethod.POST)
    public String getPortInfo(@RequestBody reqData req){
        return helloService.getPortInfo(req) ;
    }

public class reqData {
    private String hostName;
    private String ip;
        //省略get set
}

提示的错误
org.springframework.web.client.HttpClientErrorException$UnsupportedMediaType: 415 null
at org.springframework.web.client.HttpClientErrorException.create(HttpClientErrorException.java:95) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:122) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:102) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.client.ResponseErrorHandler.handleError(ResponseErrorHandler.java:63) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:778) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:736) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:670) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:414) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at com.fangsir.ribbonnconsumer.Service.HelloService.getPortInfo(HelloService.java:26) ~[classes/:na]
at com.fangsir.ribbonnconsumer.controller.HelloController.getPortInfo(HelloController.java:24) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_201]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_201]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

org.springframework.web.client.HttpClientErrorException$UnsupportedMediaType: 415 Unsupported MediaType
这个报错是因为消息头没有设置MediaType，只需要在HttpHeaders 中进行如下操作即可

requestHeaders.setContentType(MediaType.APPLICATION_JSON_UTF8);
https://www.jianshu.com/p/c2663ba6826e