实现HandlerExceptionResolver全局异常

import org.springframework.core.annotation.Order;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;

@Slf4j
@Order(Integer.MIN_VALUE)
@Component
public class ExceptionHandler implements HandlerExceptionResolver {

@Override<br />    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {<br />        ModelAndView mv = new ModelAndView();<br />        ResultVO result;<br />        try {<br />            response.setContentType(MediaType._APPLICATION_JSON_UTF8_VALUE_);<br />            PrintWriter writer = response.getWriter();<br />            if (ex instanceof BusinessException) {<br />                log.error("BusinessException:{},requestId:{}", ex.getMessage(), LocalContext.getArgument(CommonConstant.REQUEST_ID,String.class),ex);<br />                result = ((BusinessException) ex).getResult();<br />                writer.write(JSON.toJSONString(result));<br />            } else if (ex instanceof ParameterErrorException) {<br />                log.error("ParameterErrorException:{},requestId:{}", ex.getMessage(), LocalContext.getArgument(CommonConstant.REQUEST_ID,String.class),ex);<br />                result = ((ParameterErrorException) ex).getResult();<br />                writer.write(JSON.toJSONString(result));<br />            } else {<br />                log.error("System error,requestId:{}",LocalContext.getArgument(CommonConstant.REQUEST_ID,String.class), ex);<br />                writer.write(JSON.toJSONString(ResultVO.error(CodeEnum.SYSTEM_EXCEPTION)));<br />            }<br />            writer.flush();<br />            writer.close();<br />        } catch (Exception e) {<br />            log.error("error", e);<br />        }<br />        return mv;<br />    }<br />}