Servlet------(声明式)异常处理

时间：2021-06-26 02:45:29

Test.java

其他方法不变，重写

protected void service()方法
public void init(ServletConfig config) throws ServletException {

        // Put your code here

        super.init(config);

    }

    @Override

    protected void service(HttpServletRequest req, HttpServletResponse res)

            throws ServletException, IOException {

        // TODO Auto-generated method stub

        //super.service(arg0, arg1);

        String method=req.getMethod();

        if(method.equals("POST")){

            doPost(req,res);

        }

        else if(method.equals("GET")){

            doGet(req,res);

        }

        res.setContentType("text/html;charset=gb2312");

        PrintWriter out=res.getWriter();

        Integer status_code=(Integer) req.getAttribute("javax.servlet.error.status_code");

        out.print("<html><head><title>错误处理页面</title></head>");

        out.print("<body>");

        switch(status_code){

        case 401:

            break;

        case 404:

            out.print("<h2>HTTP转态代码: "+status_code+"</h2><br>");

            out.print("您正在搜索的页面已删除<>br");

            break;

            default:

                break;

        }

        out.print("</body>");

        out.print("</html>");

        out.close();

    }

web.xml

其他代码不变，加入下面代码

<web-app>

........

<error-page>

      <error-code>401</error-code>

      <location>/errorPage.jsp</location>

  </error-page>

  <error-page>

      <error-code>404</error-code>

      <location>/errorPage.jsp</location>

  </error-page>

</web-app>

errorPage.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

    String path = request.getContextPath();

    String basePath = request.getScheme() + "://"

            + request.getServerName() + ":" + request.getServerPort()

            + path + "/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<base href="<%=basePath%>">

<title>My JSP 'welcome.jsp' starting page</title>

</head>

<body>

    401,405错误处理页面

</body>

</html>

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