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