电商网站项目（一）用户模块---门户

/**
* 服务端的返回响应对象
*/
//当程序返回结果失败的时候，此时data是null，这个时候我们不需要返回data的null，利用这个NON_NULL，我们就不返回空的data
@JsonSerialize(include =  JsonSerialize.Inclusion.NON_NULL)
public class ServerResponse<T> implements Serializable {
private int status;
private String msg;
private T data;

private ServerResponse(int status) {
this.status = status;
}

private ServerResponse(int status, T data) {
this.status = status;
this.data = data;
}
//这里需要注意的是，如果将private改为public时，是传递给T data呢还是传递给String msg呢，这是需要注意的
private ServerResponse(int status, String msg) {
this.status = status;
this.msg = msg;
}

private ServerResponse(int status, String msg, T data) {
this.status = status;
this.msg = msg;
this.data = data;
}
@JsonIgnore
public boolean isSuccess(){
return this.status==ResponseCode.SUCCESS.getCode();
}

public int getStatus() {
return status;
}

public String getMsg() {
return msg;
}

public T getData() {
return data;
}

public static <T> ServerResponse<T> createBySuccess(){
return new ServerResponse<T>(ResponseCode.SUCCESS.getCode());
}

public static <T> ServerResponse<T> createBySuccessMessage(String msg){
return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),msg);
}

public static <T> ServerResponse<T> createBySuccess(T data){
return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),data);
}

public static <T> ServerResponse<T> createBySuccess(String msg,T data){
return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),msg,data);
}

public static <T> ServerResponse<T> createByError(){
return new ServerResponse<T>(ResponseCode.ERROR.getCode(),ResponseCode.ERROR.getDesc());
}

public static <T> ServerResponse<T> createByErrorMessage(String errorMessage){
return new ServerResponse<T>(ResponseCode.ERROR.getCode(),errorMessage);
}

public static <T> ServerResponse<T> createByErrorCodeMessage(int errorCode,String errorMessage){
return new ServerResponse<T>(errorCode,errorMessage);
}
}

/**
* 定义返回类型的code数据表示
*/
public enum ResponseCode {
//枚举类：系统为这两个对象默认的加上了public static final
SUCCESS(0,"SUCCESS"),
ERROR(1,"ERROR"),
NEED_LOGIN(10,"NEED_LOGIN"),
ILLEGAL_ARGUMENT(2,"ILLEGAL_ARGUMENT");
// 1.枚举类对象的属性不应允许被改动，所以应该使用private final 修饰
private final int code;
private final String desc;
// 2.枚举类的使用private final 修饰的属性因该在构造器中为其赋值
ResponseCode(int code, String desc) {
this.code = code;
this.desc = desc;
}
//供外界调用开放入口
public int getCode() {
return code;
}

public String getDesc() {
return desc;
}

}