异样解决
当servlet出现异常时，servlet容器应用exception-type元素来找到与抛出的异样类型相匹配的配置
public class ExceptionHandler extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { Throwable throwable = (Throwable) req.getAttribute("javax.servlet.error.exception"); Integer code = (Integer) req.getAttribute("javax.servlet.error.status_code"); String message = (String) req.getAttribute("javax.servlet.error.message"); System.out.println("========="); System.out.println(throwable); System.out.println("========="); System.out.println(code); System.out.println("========="); System.out.println(message); }}<!-- more -->
<!-- 配置异样解决的servlet --><servlet> <servlet-name>ExceptionHandler</servlet-name> <servlet-class>com.zhanghe.study.servlet.ExceptionHandler</servlet-class></servlet><servlet-mapping> <servlet-name>ExceptionHandler</servlet-name> <url-pattern>/ExceptionHandler</url-pattern></servlet-mapping><!-- 配置哪些错误码会调用该异样解决类 --><error-page> <error-code>404</error-code> <location>/ExceptionHandler</location></error-page><!-- 配置哪些异样类型会调用该异样解决类 --><error-page> <exception-type>java.lang.ArithmeticException</exception-type> <location>/ExceptionHandler</location></error-page>如果出现异常，会在申请域中设置相应的属性
能够应用request.getAttribute("")取出
javax.servlet.error.status_code //错误码，Integer类型javax.servlet.error.exception_type // 异样类型，Class类型javax.servlet.error.message //异样信息,String类型javax.servlet.error.request_uri //出现异常的uri地址，String类型javax.servlet.error.exception //异样，Throwable类型javax.servlet.error.servlet_name //servlet名称，String类型https://zhhll.icu/2021/javaweb/根底/9.异样解决/
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