Java中响应结果工具类,可自定义响应码，内容，响应消息

创建响应状态码和说明枚举类

/**
 * 响应状态码和说明
 */
public enum CodeEnum {
    SUCCESS(0, "成功！"),
    FAIL(1, "失败，未知错误！"),;
​
    /**
     * 响应状态码
     */
    private final int code;
​
    /**
     * 响应提示
     */
    private final String msg;
​
    CodeEnum(int code, String msg) {
        this.code = code;
        this.msg = msg;
    }
​
    public int getCode() {
        return code;
    }
​
    public String getMsg() {
        return msg;
    }
}

基本响应封装

/**
 * 基本响应封装
 */
public class BaseResponse {
​
    /**
     * 响应码
     */
    private int code;
​
    /**
     * 响应消息
     */
    private String msg;
​
    protected BaseResponse() {}
​
    protected BaseResponse(CodeEnum code) {
        this.code = code.getCode();
        this.msg = code.getMsg();
    }
​
    public static BaseResponse out(CodeEnum code) {
        return new BaseResponse(code);
    }
​
    public int getCode() {
        return code;
    }
​
    public void setCode(int code) {
        this.code = code;
    }
​
    public String getMsg() {
        return msg;
    }
​
    public void setMsg(String msg) {
        this.msg = msg;
    }
}

响应数据结构封装

/**
 * 响应数据结构封装
 */
public class ResponseData<T> extends BaseResponse {
​
    private T data;
​
    private ResponseData() {}
​
    private ResponseData(CodeEnum code, T data) {
        super(code);
        this.data = data;
    }
    
    public static <T> ResponseData<T> out(CodeEnum code, T data) {
        return new ResponseData<T>(code, data);
    }
​
    public T getData() {
        return data;
    }
​
    public void setData(T data) {
        this.data = data;
    }
​
}
​

测试

public static void main(String[] args) {
    BaseResponse out = BaseResponse.out(CodeEnum.SUCCESS);
    System.out.println("基本响应封装:\n" + JSON.toJSONString(out));
    List<String> list = new LinkedList<>();
    list.add(UUID.randomUUID().toString());
    ResponseData<List<String>> data = ResponseData.out(CodeEnum.FAIL, list);
    System.out.println("响应数据结构封装:\n" + JSON.toJSONString(data));
}

打印结果： 基本响应封装: {"code":0,"msg":"成功！"} 响应数据结构封装: {"code":1,"data":["aac1d70a-1eaf-4d6a-8383-102ced0bdf29"],"msg":"失败，未知错误！"}