SpringBoot 2.x 开发案例之优雅的处理异常

/**
 *  异常处理器
 */
@RestControllerAdvice
public class RrExceptionHandler {
    
    private Logger logger = LoggerFactory.getLogger(getClass());

    @ExceptionHandler(Exception.class)
    public Result handleException(Exception e){
        logger.error(e.getMessage(), e);
        return Result.error();
    }
    
    /**
     * 自定义异常
     */
    @ExceptionHandler(RrException.class)
    public Result handleRRException(RrException e){
        Result r = new Result();
        r.put("code", e.getCode());
        r.put("msg", e.getMessage());
        return r;
    }
    @ExceptionHandler(DuplicateKeyException.class)
    public Result handleDuplicateKeyException(DuplicateKeyException e){
        logger.error(e.getMessage(), e);
        return Result.error("数据库中已存在该记录");
    }
}

/**
 *  自定义异常
 *  创建者  爪洼笔记
 *  博客 https://blog.52itstyle.vip
 *  创建时间    2019年8月15日
 */
public class RrException extends RuntimeException {
    
    private static final long serialVersionUID = 1L;
    
    private String msg;
    
    private int code = 500;
    
    public RrException(String msg) {
        super(msg);
        this.msg = msg;
    }
    
    public RrException(String msg, Throwable e) {
        super(msg, e);
        this.msg = msg;
    }
    
    public RrException(String msg, int code) {
        super(msg);
        this.msg = msg;
        this.code = code;
    }
    
    public RrException(String msg, int code, Throwable e) {
        super(msg, e);
        this.msg = msg;
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }
}

/**
 *  页面响应
 *  @Author  小柒2012
 *  @Date     2019年1月21日
 */
public class Result extends HashMap<String, Object> {

    private static final long serialVersionUID = 1L;

    public Result() {
        put("code", 0);
    }

    public static Result error() {
        return error(500, "未知异常，请联系管理员");
    }

    public static Result error(String msg) {
        return error(500, msg);
    }

    public static Result error(int code, String msg) {
        Result r = new Result();
        r.put("code", code);
        r.put("msg", msg);
        return r;
    }

    public static Result ok(Object msg) {
        Result r = new Result();
        r.put("msg", msg);
        return r;
    }

    public static Result ok(Map<String, Object> map) {
        Result r = new Result();
        r.putAll(map);
        return r;
    }

    public static Result ok() {
        return new Result();
    }

    @Override
    public Result put(String key, Object value) {
        super.put(key, value);
        return this;
    }
}

@RequestMapping("eatChicken")
public Result eatChicken() {
     String 马化腾 = null;
     if(马化腾.equals("码云")){
         System.out.println("一起搞基");
     }
     return Result.ok();
}

{"msg":"未知异常，请联系管理员","code":500}

java.lang.NullPointerException: null
    at com.itstyle.chicken.module.tools.web.ArticleController.get(ArticleController.java:35)