post请求 restTemplate.postForObject restTemplate.postForEntity java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to xxx POSTpost请求

1.restTemplate调用的两种方式及获取字符串转换对象model的处理,统一按接收字符串，然后gson转换为对象的方式。

ResponseData对象包含的属性
private String resCode;
private String resMsg;
private T data;

import java.lang.reflect.Type;
import com.google.common.reflect.TypeToken;
import com.google.gson.Gson;

@Test
    public void testPost1() {
        String url = "http://IP:PORT/";
        String memNo = "111";
        ReqVO reqVo = new ReqVO();
        reqVo.setMemNo(memNo);
        String json = restTemplate.postForObject(url, reqVo, String.class);
        log.info("string = " + json);

        //java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to xxx
//        ResponseData<OpenInfoStatusVO> responseEntity =  new Gson().fromJson(json, ResponseData.class);

//这个是关键
        Type type = new TypeToken<ResponseData<MyResponseInfoStatusVO>>() {}.getType();

        ResponseData<MyResponseInfoStatusVO> responseEntity = new Gson().fromJson(json, type);

        if (responseEntity == null || responseEntity.getData() == null) {
            log.info("postForEntity null,params memNo=[{}]",memNo);
        }else {
            MyResponseInfoStatusVOstatusVo = (MyResponseInfoStatusVO) responseEntity.getData();
            log.info("postForEntity ok,result=[{}],params memNo=[{}]",GsonUtils.toJson(statusVo),memNo);

        }
    }

import java.lang.reflect.Type;
import com.google.common.reflect.TypeToken;
import com.google.gson.Gson;

@Test
    public void testPost2() {
        String url = "http://IP:PORT/";
        String memNo = "222";
        ReqVO reqVo = new ReqVO();
        reqVo.setMemNo(memNo);
//区别点
        ResponseEntity<String> response = restTemplate.postForEntity(url, reqVo, String.class);
        log.info("string = " + GsonUtils.toJson(response));

        //java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to xxx
//        ResponseData<MyResponseInfoStatusVO> responseEntity =  new Gson().fromJson(response.getBody(), ResponseData.class);

//这个是关键
        Type type = new TypeToken<ResponseData<MyResponseInfoStatusVO>>() {}.getType();

        ResponseData<MyResponseInfoStatusVO> responseEntity = new Gson().fromJson(response.getBody(), type);

        if (responseEntity == null || responseEntity.getData() == null) {
            log.info("postForEntity null,params memNo=[{}]",memNo);
        }else {
            MyResponseInfoStatusVOstatusVo = (MyResponseInfoStatusVO) responseEntity.getData();
            log.info("postForEntity ok,result=[{}],params memNo=[{}]",GsonUtils.toJson(statusVo),memNo);

        }
    }

2.

/**
     * post请求方式 postForObject
     * @return
     */
    public String getToken() {
        RestTemplate restTemplate = new RestTemplate();
        HttpHeaders headers = new HttpHeaders();
        MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
        headers.setContentType(type);
        headers.add("Accept", MediaType.APPLICATION_JSON.toString());

        AuthTokenReqVo reqVo = new AuthTokenReqVo();
        reqVo.setApp_id(id);

        HttpEntity<String> formEntity = new HttpEntity<>(JSON.toJSONString(reqVo), headers);

        String result = restTemplate.postForObject("http://ip:端口/toGetToken", formEntity, String.class);

        AuthTokenResVo resVo = JSON.parseObject(result, AuthTokenResVo.class);
        if(resVo != null){
            return resVo.getToken();
        }
        return "";
    }

/**
     * post请求方式 postForEntity
     * @return
     */
public String getToken() {
        ResponseEntity<String> response = null;

        RestTemplate restTemplate = new RestTemplate();

        AuthTokenReqVo reqVo = new AuthTokenReqVo();
        reqVo.setApp_id(id);

        String reqJson = JSON.toJSONString(reqVo);
        logger.info("AuthToken请求参数-response:[{}]", reqJson);
        response = restTemplate.postForEntity("http://ip:端口/toGetToken", reqVo, String.class);
        logger.info("AuthToken返回结果-response:[{}]", GsonUtils.toJson(response));
        if (HttpStatus.OK == response.getStatusCode()) {
            AuthTokenResVo resVo = JSON.parseObject(response.getBody(), AuthTokenResVo.class);
            if(resVo != null){
                return resVo.getToken();
            }
        }
        return "";
    }