spring+springmvc中的异常处理

一、使用HandlerExceptionResolver实现全局异常捕获

 

 

1、封装一个自己的业务异常类

 

 

public final class BizException extends RuntimeException {

	private static final long serialVersionUID = 8342451586322744222L;
	/**
	 * 业务异常码
	 */
	private Code codes;
	/**
	 * 异常信息
	 */
	private String bizMsg;

	/**
	 * 私有构造函数
	 *
	 * @param codes
	 * @param bizMessage
	 */
	private BizException(Code codes, String bizMessage) {

		super(codes.getMessage() + "：" + bizMessage);
		this.codes = codes;
		this.bizMsg = bizMessage;
	}

	/**
	 * 静态工厂方法
	 *
	 * @return
	 */
	public static BizException create(Code code) {
		return new BizException(code, null);
	}

	public static BizException create(Code code, String msg) {
		return new BizException(code, msg);
	}

	public Code getCodes() {
		return codes;
	}

	public void setCodes(Code codes) {
		this.codes = codes;
	}

	public String getBizMsg() {
		return bizMsg;
	}

	public void setBizMsg(String bizMsg) {
		this.bizMsg = bizMsg;
	}
}

 

 

 

2、定义自己的异常处理类MyExceptionHandler需要实现org.springframework.web.servlet.HandlerExceptionResolver接口。

 

public class MyExceptionHandler implements HandlerExceptionResolver {
	private static final Logger LOG = LoggerFactory.getLogger(MyExceptionHandler.class);

	@Override
	public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
			Object o, Exception e) {
		httpServletResponse.setCharacterEncoding("UTF-8");
		httpServletResponse.setHeader("Content-type", "application/json;charset=UTF-8");
		try {
			if (e instanceof BizException) {
				LOG.error("业务异常：" + e.getMessage());
				BizException ex = (BizException) e;
				HttpResponse httpResponse = HttpResponse.create(ex.getCodes(),
						StringUtils.isBlank(ex.getBizMsg()) ? "" : ex.getBizMsg());
				httpServletResponse.getWriter().write(new Gson().toJson(httpResponse));
			} else {
				LOG.error("系统异常：" + e.getMessage());
				e.printStackTrace();
				HttpResponse httpResponse = HttpResponse.create(Code.SystemError, e.getMessage());
				httpServletResponse.getWriter().write(new Gson().toJson(httpResponse));
			}
		} catch (IOException e1) {

		}
		return new ModelAndView();
	}
}

 

 

3、在spring配置文件中定义bean

 

 

 

 

4、在代码中抛出自己的异常在resolveException方法中进行处理。

 

 

if (task == null) {
			throw BizException.create(Code.NoProcess, "未执行通过上一步流程");
		}

 

 

Code为自己定义的错误码枚举

 

二、使用@ControllerAdvice 、@ExceptionHandler两个注解来实现全局的异常捕获

 

 

// @ControllerAdvice
public class DefaultExceptionHandler {

	// @ResponseStatus(HttpStatus.UNAUTHORIZED)
	// @ExceptionHandler({ BizException.class, SizeLimitExceededException.class,
	// MaxUploadSizeExceededException.class })
	// @ResponseBody
	public HttpResponse processUnauthorizedException(NativeWebRequest request, Exception e) {
		if (e instanceof BizException) {
			((BizException) e).getCodes();
		} else if (e instanceof MaxUploadSizeExceededException || e instanceof SizeLimitExceededException) {
			return HttpResponse.create(Code.SizeOver, "文件大小超过了10M");
		}
		return HttpResponse.create(Code.SystemError, e.getMessage());
		// 判断异常类型，返回相应内容
	}

}

 

@ControllerAdvice注解类似@Controller，后面加Advice可以理解为在Controller的方法上加的通知（后置）。在Controller的方法执行后，如果有异常抛出，会被该类的对应方法拦截。@ExceptionHandler注解表示拦截指定的异常，在@ExceptionHandler注解的方法中处理捕获的异常。返回同Controller。