背景：
跨模块通过post请求调用指定接口，返回415
415状态码解释：
Unsupported Media Type
对于当前请求的方法和所请求的资源，请求中提交的实体并不是服务器中所支持的格式，因此请求被拒绝
错误日志：
org.springframework.web.client.HttpClientErrorException: 415 null
atorg.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:86)
at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:708)
功能错误代码和正常代码比对
异常请求返回415:
RestTemplate restTemplate = new RestTemplate();String url = "http://172.16.17.82/portal/zcm-cmdb/remote/exec";String cmd = "mkdir -p /tmp/lushuan/test5";// 1、异常请求返回 415HttpHeaders headers = new HttpHeaders();MultiValueMap<String, String> map= new LinkedMultiValueMap<String, String>();map.add("host", "172.16.24.220");map.add("user", "root");map.add("cmd", cmd);HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<MultiValueMap<String, String>>(map, headers);Object data = restTemplate.postForObject(url,request,Object.class);LOGGER.info("TestRestTemplate testInstallCollectdByRemote data = {}", data);
正常代码演示1:
RestTemplate restTemplate = new RestTemplate();String url = "http://172.16.17.82/portal/zcm-cmdb/remote/exec";String cmd = "mkdir -p /tmp/lushuan/test6";Map<String, String> map = new HashMap<>();map.put("host","172.16.24.220");map.put("user","root");map.put("cmd",cmd);HttpHeaders headers = new HttpHeaders();headers.setContentType(MediaType.APPLICATION_JSON);HttpEntity<Map<String, String>> request = new HttpEntity<>(map, headers);JSONObject data = restTemplate.postForObject(url,request, JSONObject.class);LOGGER.info("TestRestTemplate testInstallCollectdByRemote data = {}", data);
正常代码演示2:
RestTemplate restTemplate = new RestTemplate();String url = "http://172.16.17.82/portal/zcm-cmdb/remote/exec";String cmd = "mkdir -p /tmp/lushuan/test7";Map<String, String> map = new HashMap<>();map.put("host","172.16.24.220");map.put("user","root");map.put("cmd",cmd);// ParameterizedTypeReference 该类的目的是启用捕获和传递泛型ParameterizedTypeReference<String> typeRef = new ParameterizedTypeReference<String>() {};JSONObject createDbJsonObject = JSONObject.fromObject(map);HttpEntity<JSONObject> entityPost = new HttpEntity<JSONObject>(createDbJsonObject);ResponseEntity<String> createDbResponse = restTemplate.exchange(url, HttpMethod.POST, entityPost,typeRef);HttpStatus statusCode = createDbResponse.getStatusCode();LOGGER.info("TestRestTemplate testInstallCollectdByRemote createDbResponse = {}", createDbResponse);LOGGER.info("TestRestTemplate testInstallCollectdByRemote statusCode = {}", statusCode);
两段代码的实现方式都可以，推荐第二种，可以获取返回的状态码，是否跨域等信息。
