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servlet简单用法

2024-08-19 11:53:01   222人阅读

一、创建java web项目

　　参考

二、创建LoginServlet类

　　LoginServlet需要继承HttpServlet，并重写四个方法：

  1. init()
  2. doGet()
  3. doPost()
  4. destroy()
package com.httpshttp.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public void init(ServletConfig config) throws ServletException {

    }

    public void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws IOException, ServletException {
        String certName = req.getHeader("client-cert-dn");
        String scheme = req.getHeader("X-Forwarded-Proto");
        if (scheme == null) scheme = "http";
        String username = req.getParameter("username");
        String context = req.getContextPath();
        
        PrintWriter out = resp.getWriter();
        out.println("<html><head><title>test</title></head><body>");
        
        if (username == null || "".equals(username)) {
            resp.sendRedirect(context);
        }
        
        if ("https.user".equals(username) && "http".equals(scheme)) {
            out.println("user " + username + " need authentication, wait 8 seconds for redirecting, or click ");
            out.println("<a href="http://www.mamicode.com/+"https://demo.belle.net.cn/httpshttp" + ">" + "ssl portal" + "</a>");
            out.println("<script language=‘javascript‘>");
            out.println("window.setTimeout(\"window.location=\‘https://demo.belle.net.cn/httpshttp\‘\",8000); ");
            out.println("</script>");
            out.println("</body></html>");
            out.close();
            return;
        }
        
        if (certName != null && !("/CN=" + username).equals(certName)) {
            out.println("user " + username + " login success");
            out.println(" ,but does not match certificate name " + certName);
        } else {
            out.println("user " + username + " login success");
        }
        out.println("</body></html>");
        out.close();
    }

    public void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws IOException, ServletException {
        doGet(req, resp);
    }

    public void destroy() {

    }
}

三、配置web.xml

<?xml version="1.0" encoding="UTF-8"?>  
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
    version="2.5">  
    <display-name>demo</display-name>  
  
    <servlet>  
        <servlet-name>login</servlet-name>  
        <servlet-class>com.httpshttp.servlet.LoginServlet</servlet-class>  
    </servlet>  
    <servlet-mapping>  
        <servlet-name>login</servlet-name>  
        <url-pattern>/login</url-pattern>  
    </servlet-mapping>  
</web-app>

四、浏览器访问

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servlet简单用法


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