springboot 如何优雅的抛出异常

之前项目的异常是一层一层抛出去及其麻烦，并且每个层都要try catch 然后把错误信息包装返回到最顶层 ，从service一层一层抛出去。人都写傻了，后面发现了springboot项目有全局拦截器。还是看的太浅了，先随便创建一个

全局拦截MyControllerAdvice.java

/**
 * controller 增强器
 */
@ControllerAdvice
public class MyControllerAdvice {
    /**
     * 全局异常捕捉处理
     * @param ex
     * @return
     */
    @ResponseBody
    @ExceptionHandler(value = RrException.class)
    public Result errorHandler(RrException ex) {
        return Result.error(ex.getMessage());
    }

}

其中的RrException 是我自定义的异常 因为我自己要抛出  但是Exception又需要捕捉  ，而自定义的错误就不用

异常类RrException .class

/**
 * 自定义异常
 * @author zyc
 */
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;
	}
	
	
}

这样在

这样后端报的错误就会被拦截然后返回一个Result对象到前端

结果类Result.class

public class Result extends HashMap {
	private static final long serialVersionUID = 1L;
	
	public Result() {
		put("code", 0);
		put("msg", "success");
	}
	
	public static Result error() {
		return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, "未知异常，请联系管理员");
	}
	
	public static Result error(String msg) {
		return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, 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(String msg) {
		Result r = new Result();
		r.put("msg", msg);
		return r;
	}
	
	public static Result ok(Map 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;
	}
}

参考自https://www.jianshu.com/p/383725700b7b