JSON对象转换泛型问题

public class AppResult<T> {
 ??private int code;
 ??private Map<String,Object> data = new HashMap<String,Object>();
 ??private int success;
 ??private int ret;
 ??private String msg;
 ??public enum status {
 ?????
 ?????SUCESS(1),
 ?????
 ?????FAIL(0),
 ?????
 ?????EXCEPTION(-1);
 ?????
 ?????status(int value) {
 ????????this.value = value;
 ?????}
 ?????
 ?????private int value;
 ?????
 ?????public int getValue() {
 ????????return value;
 ?????}
 ?????
 ?????public void setValue(int value) {
 ????????this.value = value;
 ?????}
 ??}
 ??
 ??public AppResult<T> setResult(String name,T data){
 ?????this.data.put(name,data);
 ?????return this;
 ??}
 ??public AppResult<T> success(String dataName,T data){
 ?????this.setSuccess(status.SUCESS.getValue());
 ?????this.data.put(dataName,data);
 ?????this.setRet(200);
 ?????this.setCode(0);
 ?????return this;
 ??}
 ??public AppResult<T> fail(String msg) {
 ?????this.setSuccess(status.FAIL.getValue());
 ?????this.setMsg(msg);
 ?????this.setRet(200);
 ?????this.setCode(-1);
 ?????return this;
 ??}
 ??
 ??public AppResult<T> exception(Throwable e) {
 ?????this.setSuccess(status.EXCEPTION.getValue());
 ?????this.setMsg(e.getMessage());
 ?????this.setRet(200);
 ?????this.setCode(-1);
 ?????return this;
 ??}
 ??
 ??public int getCode() {
 ?????return code;
 ??}
 ??
 ??public void setCode(int code) {
 ?????this.code = code;
 ??}
 ??
 ??public int getSuccess() {
 ?????return success;
 ??}
 ??
 ??public void setSuccess(int success) {
 ?????this.success = success;
 ??}
 ??
 ??public int getRet() {
 ?????return ret;
 ??}
 ??
 ??public void setRet(int ret) {
 ?????this.ret = ret;
 ??}
 ??
 ??public String getMsg() {
 ?????return msg;
 ??}
 ??
 ??public void setMsg(String msg) {
 ?????this.msg = msg;
 ??}
 ??
 ??public Map<String, Object> getData() {
 ?????return data;
 ??}
 ??
 ??public void setData(Map<String, Object> data) {
 ?????this.data = data;
 ??}
}

//如下将一个json字符串转成AppResult对象后，转成CrmShopCustVO会报错
AppResult<CrmShopCustVO> appResult = JsonUtil.jsonToObject((String) result, new TypeReference<AppResult<CrmShopCustVO>>() {});
Map<String, Object> dataMap = ?appResult.getData();
//下面这句话会报错： LikedHashMap can not convert to CrmShopCustVO
CrmShopCustVO crmShopCustomerVo = (CrmShopCustVO)dataMap.get("result");

因为private Map<String,Object> data是Object类型，默认转成了LinkedhashMap,应该讲data改为 private Map<String,T> data,如下显示：

public class AppResult<T> {
 ??private int code;
 ??private Map<String,T> data = new HashMap();
 ??private int success;
 ??private int ret;
 ??private String msg;

JSON对象转换泛型问题

原文地址：https://www.cnblogs.com/chenge-0401/p/9844239.html