JAVA高级面试进阶训练营视频教程

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1.spring设置全局异常,它的原理是向上捕获

spring.xml配置

   <!--自定义全局异常处理器-->
    <bean id="globalExceptionResolver" class="com.data.controller.exception.GlobalExceptionResolver"/>

import com.data.service.email.EmailMessage;
import com.data.utils.constant.AliasConstant;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;


@Controller
public class GlobalExceptionResolver implements HandlerExceptionResolver {

    @Resource
    EmailMessage emailMessage;

    /**
     * 进行全局异常过滤并处理
     *
     * @param request  action 请求
     * @param response 服务器响应
     * @param handler  发生错误的事件句柄
     * @param ex       异常情况
     * @return 视图&对象
     */

    @Override
    public ModelAndView resolveException(HttpServletRequest request,
                                         HttpServletResponse response,
                                         Object handler, Exception ex) {
        //使用StringBuilder提搞GC回收效率，降低垃圾回收开销
        StringBuilder content = new StringBuilder("<++>AllInOne-busWeb抓捕到异常具体内容信息:<++> \t\n");
        String userId = (String) request.getSession().getAttribute(AliasConstant.UserId);
        content.append("造成该异常的用户userID为：   " + userId + "  \t\n");
        content.append("爆出异常的类型为：  " + ex.getClass() + "   \t\n");
        content.append("异常发生的位置为：     " + handler + "   \t\n");
        content.append("造成的原因:      " + ex.getMessage() + "     \t\n");
        content.append("造成的详细原因为：\t\n\n");
        StackTraceElement[] trace = ex.getStackTrace();
        for (StackTraceElement traceElement : trace)
            content.append("at\t  " + traceElement + "\t\n");
        return null;
    }
}