JSON对象转换泛型问题

Posted 2021-01-14 教主陈

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;