高复用的面向接口编程接口设计（以用户开发过程为例）

在用户模块开发过程中经常要想前台传递数据信息，假设这个json格式是这样的

{

       state:0,

       msg:"success",

       data:{一堆不同类型的数据}

}

每次弄不同的东西的话，很烦。为了实现这个功能就设计了一个高复用的接口类ServiceResponse，并将其json序列化：

package com.mmal.common;import org.codehaus.jackson.annotate.JsonIgnore;import org.codehaus.jackson.map.annotate.JsonSerialize;import org.omg.CORBA.Object;import java.io.Serializable;/** * Created by Administrator on 2017/9/4. */@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)//保证序列化json的时候，如果是null，key也会消失public class ServiceResponse <T> implements Serializable {    private int status;    private String msg;    private T data;    private  ServiceResponse(int status){        this.status=status;    }    private  ServiceResponse(int status,T data){        this.status =status;        this.data=data;    }    private  ServiceResponse(int status,String msg,T data){        this.status =status;        this.msg =msg;        this.data = data;    }    private ServiceResponse(int status,String msg){        this.status =status;        this.msg=msg;    }    @JsonIgnore    //使之不在序列化结果之中    public boolean isSucess(){        return  this.status==ResponseCode.SUCCESS.getCode();    }    public int getStatus(){        return status;    }    public String getMsg(){        return msg;    }    public T getData(){        return data;    }    public  static <T> ServiceResponse<T> CreateBySuccess(){        return  new ServiceResponse<T>(ResponseCode.SUCCESS.getCode());    }    public  static <T> ServiceResponse<T> CreateBySuccessMessage(String msg){        return  new ServiceResponse<T>(ResponseCode.SUCCESS.getCode(),msg);    }    public  static <T> ServiceResponse<T> CreateBySuccess(T data){        return  new ServiceResponse<T>(ResponseCode.SUCCESS.getCode(),data);    }    public  static <T> ServiceResponse<T> CreateBySuccess(String msg,T data){        return  new ServiceResponse<T>(ResponseCode.SUCCESS.getCode(),msg,data);    }    public static  <T> ServiceResponse<T> CreateByError(){        return  new ServiceResponse<T>(ResponseCode.ERROR.getCode(),ResponseCode.ERROR.getDesc());    }    public static  <T> ServiceResponse<T> CreateByErrorMessage(String errormsg){        return  new ServiceResponse<T>(ResponseCode.ERROR.getCode(),errormsg);    }    //报一个变量的错误    public static  <T> ServiceResponse<T> CreateByErrorCodeMessage(int errorCode,String errorMessage){        return  new ServiceResponse<T>(errorCode,errorMessage);    }}

同时还需要一个枚举类ResponseCode：

package com.mmal.common;/** * Created by Administrator on 2017/9/4. */public enum ResponseCode {    SUCCESS(0,"SUCCESS"),    ERROR(1,"ERROR"),    NEED_LOGIN(10,"NEED_LOGIN"),    ILLEAGAL_ARGUMENT(2,"ILLEAGAL_ARGUMENT");    private final  int code;    private final String desc;    private ResponseCode(int code,String desc){        this.code = code;        this.desc=desc;    }    public int getCode(){        return code;    }    public String getDesc(){        return desc;    }}