login.java:
复制代码代码如下:
package com.ncu;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class login extends HttpServlet{
public void doGet(HttpServletRequest req,HttpServletResponse res){
try{
//res.setCharacterEncoding("utf-8");
res.setContentType("text/html;charset=gbk");
PrintWriter pw=res.getWriter();
//返回登录界面
pw.print("< html >");
pw.print("< head >");
pw.print("< title >登录界面< /title >< /head >");
pw.print("< body >");
pw.print("< h1 >用户登录界面< /h1 >");
pw.print("< form action='loginpro' method=post >");
pw.print("用户名：< input type=text name=userName >< br >");
pw.print("密码：< input type=password name=Pwd >< br >");
pw.print("< input type=submit value=submit >");
pw.print("< /body >< /html >");
}catch(Exception e)
{
e.printStackTrace();
}
}
}
LoginPro.java:
复制代码代码如下:
package com.ncu;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginPro extends HttpServlet{
public void doPost(HttpServletRequest req,HttpServletResponse res){
try{
String user=req.getParameter("userName");
String pwd=req.getParameter("Pwd");
if(user==null){
user="";
}
if(pwd==null)
{
pwd="";
}
if(user.equals("nicolas")&&pwd.equals("nicolas")){
//用户和密码合法
//res.sendRedirect("wel");
//res.setCharacterEncoding("gbk");
//PrintWriter pw=res.getWriter();
//pw.print("恭喜你，登录成功！！");
res.sendRedirect("welcome");
}
else{
//不合法进行跳转
res.sendRedirect("login");//跳转到登录界面
}
}catch(Exception e)
{
e.printStackTrace();
}
}
}
Welcome.java:
复制代码代码如下:
package com.ncu;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Welcome extends HttpServlet{
public void doGet(HttpServletRequest req,HttpServletResponse res){
try{
res.setCharacterEncoding("gbk");
PrintWriter pw=res.getWriter();
pw.print("welcome，您好");
}catch(Exception e)
{
e.printStackTrace();
}
}
}
web.xml
复制代码代码如下:
< ?xml version="1.0" encoding="UTF-8"? >
< web-app version="3.0"
xmlns="http://java.s***un.com/xml/ns/javaee"
xmlns:xsi="http://www.**w*3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.s***un.com/xml/ns/javaee
http://java.s***un.com/xml/ns/javaee/web-app_3_0.xsd" >
< display-name >< /display-name >
< welcome-file-list >
< welcome-file >index.jsp< /welcome-file >
< /welcome-file-list >
< servlet >
< !-- 给你的servlet取名，任意的 -- >
< servlet-name >hello< /servlet-name >
< !-- 指明servlet的路径（包名+类名 -- >
< servlet-class >com.ncu.Hello< /servlet-class >
< /servlet >
< servlet-mapping >
< !-- 这个servlet名必须和映射的一致 -- >
< servlet-name >hello< /servlet-name >
< !-- 这是在浏览器中输入的访问该servlet的url -- >
< url-pattern >/nicolas< /url-pattern >
< /servlet-mapping >
< servlet >
< servlet-name >helloservlet< /servlet-name >
< servlet-class >com.ncu.HelloServlet< /servlet-class >
< /servlet >
< servlet-mapping >
< servlet-name >helloservlet< /servlet-name >
< url-pattern >/helloservlet< /url-pattern >
< /servlet-mapping >
< servlet >
< servlet-name >helloHttpServlet< /servlet-name >
< servlet-class >com.ncu.helloHttpServlet< /servlet-class >
< /servlet >
< servlet-mapping >
< servlet-name >helloHttpServlet< /servlet-name >
< url-pattern >/helloHttpServlet< /url-pattern >
< /servlet-mapping >
< servlet >
< servlet-name >login< /servlet-name >
< servlet-class >com.ncu.login< /servlet-class >
< /servlet >
< servlet-mapping >
< servlet-name >login< /servlet-name >
< url-pattern >/login< /url-pattern >
< /servlet-mapping >
< servlet >
< servlet-name >loginpro< /servlet-name >
< servlet-class >com.ncu.LoginPro< /servlet-class >
< /servlet >
< servlet-mapping >
< servlet-name >loginpro< /servlet-name >
< url-pattern >/loginpro< /url-pattern >
< /servlet-mapping >
< servlet >
< servlet-name >welcome< /servlet-name >
< servlet-class >com.ncu.Welcome< /servlet-class >
< /servlet >
< servlet-mapping >
< servlet-name >welcome< /servlet-name >
< url-pattern >/welcome< /url-pattern >
< /servlet-mapping >
< /web-app >