異常及結果、枚舉封裝

異常的封裝

以全局異常處理
作爲錯誤的狀況下的返回值
必須帶有{code:"",msg:""}

同時結果集類必須包含：
{code:"",msg:""}

1、結果集封裝

public class Result<T> implements Serializable{

    private static final long serialVersionUID = -20552077545148552L;

    private String code;
    private String message;
    private T data;

    public Result() {}

    public Result(CodeMsgEnum codeMsgEnum) {
        this.code = codeMsgEnum.getCode();
        this.message = codeMsgEnum.getMessage();
    }

    public Result(CodeMsgEnum codeMsgEnum, T data) {
        this.code = codeMsgEnum.getCode();
        this.message = codeMsgEnum.getMessage();
        this.data = data;
    }

    public Result(String code, String message, T data) {
        this.code = code;
        this.message = message;
        this.data = data;
    }

    public static <T> Result<T> success(T data) {
        return new Result(CodeMsgEnum.SUCCESS, data);
    }

    public static <T> Result<T> success() {
        return new Result(CodeMsgEnum.SUCCESS,null);
    }


    public static  <T> Result<T> error(CodeMsgEnum codeMsgEnum) {
        return new Result(codeMsgEnum,null);
    }

    public static  <T> Result<T> error(String code, String msg) {
        return new Result(code, msg,null);
    }

    public static  <T> Result<T> error(String msg) {
        return new Result(CodeMsgEnum.SREVER_ERROR.getCode(), msg ,null);
    }  
}

2、異常類封裝

public class BusinessException extends RuntimeException {

    private static final long serialVersionUID = 5858874149529785542L;

    /**
     * code
     */
    private String code;
    /**
     * 異常信息
     */
    private String message;


    public BusinessException() {
    }

    /**
     * 服務端未知異常
     *
     * @param message
     */
    public BusinessException(String message) {
        super(message);
        this.code = CodeMsgEnum.SREVER_ERROR.getCode();
        this.message = message;
    }

    public BusinessException(String message, Throwable cause) {
        super(message, cause);
        this.code = CodeMsgEnum.SREVER_ERROR.getCode();
        this.message = message;
    }

    /**
     * 返回常用異常類型：
     *    CodeMsgEnum 通用異常
     * @param codeMsgEnum
     */
    public BusinessException(CodeMsgEnum codeMsgEnum) {
        super(codeMsgEnum.getMessage());
        this.code = codeMsgEnum.getCode();
        this.message = codeMsgEnum.getMessage();
    }

    /**
     * 異常信息傳入：
     *    方便每個業務系統定義各自內部異常
     * @param code
     * @param message
     */
    public BusinessException(String code, String message) {
        super(message);
        this.code = code;
        this.message = message;
    }

}

3、通用異常枚舉類

public enum  CodeMsgEnum {

    /**
     * 通用枚舉，各個系統模塊可
       單獨編寫異常類
     */
    SUCCESS("200", "成功"),
    SREVER_ERROR("500", "服務器內部錯誤"),
    UNKNOWN_ERROR("1000000", "未知錯誤"),
    NO_FIND_REQUEST("1001404","找不到資源"),
    NO_AUTHORIZE("1001401", "未授權"),
    AUTHENTICATION_FAIL("1001403", "認證失敗"),
    PARAMS_ERROR("1001400","請求參數不合法"),

   
    private final String code;
    private final String message;

    CodeMsgEnum(String code, String message) {
        this.code = code;
        this.message = message;
    }
    public static CodeMsgEnum getCodeMsgEnumByCode(String code) {
        for (CodeMsgEnum codeMsgEnum : CodeMsgEnum.values()) {
            if (codeMsgEnum.code.equals(code)) {
                return codeMsgEnum;
            }
        }
        return null;
    }
    public String getCode() {
        return code;
    }

    public String getMessage() {
        return message;
    }

}