本人初学web组件，很多基础不会，望各位大神不要鄙视~~~~
-----login.java----
package com.tsinghua;
import javax.servlet.http.*;
import java.io.*;
public class Login extends HttpServlet{
public void doGet(HttpServletRequest req,HttpServletResponse res){
//业务逻辑
try{
//接受用户名和密码
String u=req.getParameter("usrename");
String p=req.getParameter("passwd");
//中文乱码
res.setContentType("text/html;charset=gbk");
PrintWriter pw=res.getWriter();
pw.println("<html>");
pw.println("<body>");
pw.println("<form action=logincl method=post>");
pw.println("用户名：<input type=text name=username><br>");
pw.println("密码：<input type=password name=passwd><br>");
pw.println("<input type=submit value=Login><br>");
pw.println("</form>");
pw.println("</body>");
pw.println("</html>");
}
catch(Exception ex){
ex.printStackTrace();
}
}
public void doPost(HttpServletRequest req,HttpServletResponse res){
this.doGet(req,res);
}
}
----loginCl.java----------
package com.tsinghua;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
public class LoginCl extends HttpServlet{
public void doGet(HttpServletRequest req,HttpServletResponse res){
Connection ct=null;
Statement sm=null;
ResultSet rs=null;
String host="127.0.0.1:3306";
try{
String u=req.getParameter("username");
String p=req.getParameter("passwd");
PrintWriter pw=res.getWriter();
Class.forName("com.mysql.jdbc.Driver");
ct=DriverManager.getConnection("jdbc:mysql://"+host+"/login","root","2535663");
sm=ct.createStatement();
rs=sm.executeQuery("select top 1 * from users where username='"+u+"'and passwd='"+p+"'");
pw.println("连接成功！");
if(rs.next()){
//合法
res.sendRedirect("welcome");
}else{
//不合法
res.sendRedirect("login");
}
HttpSession hs=req.getSession(true);
hs.setMaxInactiveInterval(30);
hs.setAttribute("uname",u);
}
catch(SQLException e)
{
e.printStackTrace();
}
catch(ClassNotFoundException e)
{
e.printStackTrace();
}
catch(Exception ex){
ex.printStackTrace();
}
finally{
try {
if(rs!=null){
rs.close();
}
if(sm!=null){
sm.close();
}
if(ct!=null){
ct.close();
}
}catch (Exception ex) {
ex.printStackTrace();
}
}
}
public void doPost(HttpServletRequest req,HttpServletResponse res){
this.doGet(req,res);
}
}
------wel.java-------
package com.tsinghua;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
public class wel extends HttpServlet{
public void doGet(HttpServletRequest req,HttpServletResponse res){
Connection ct=null;
Statement sm=null;
ResultSet rs=null;
String host="127.0.0.1:3306";
try{
String u=req.getParameter("username");
String p=req.getParameter("passwd");
//从session中得到用户名
HttpSession hs=req.getSession(true);
String myName=(String)hs.getAttribute("uname");
String name="";
String passwd="";
if(myName==null){
res.sendRedirect("login");
return ;
}
//解决中文乱码
res.setCharacterEncoding("gbk");
PrintWriter pw=res.getWriter();
pw.println("<body bgcolor=#CED3FF>");
pw.println("<img src=imgs/1.GIF> 欢迎您:"+myName+"<img src=imgs/me.gif><hr><center>");
pw.println("<h1>管理用户</h1>");
//做个超链接
pw.println("<br><a href=login>返回重新登录</a>");
}catch(Exception ex){
ex.printStackTrace();
}
}
public void doPost(HttpServletRequest req,HttpServletResponse res){
this.doGet(req,res);
}
}
----------------------------sql文件------------------------------------
drop database if exists login;
create database login;
use login;
drop table if exists users;
create table users (
username varchar(20),
passwd varchar(20),
email varchar(30),
grade int);
insert into users values
('admin','admin','admin@sohu.com',1);
insert into users values
('shunping','shunping','shunping@sohu.com', 1);
insert into users values
('tester1','tester1','tester1@sohu.com',5);
insert into users values
('tester2','tester2','tester2@sohu.com',5);
insert into users values
('tester3','tester3','tester3@sohu.com',5);
insert into users values
('tester4','tester4','tester4@sohu.com',5);
insert into users values
('tester5','tester5','tester5@sohu.com',5);
insert into users values
('tester6','tester6','tester6@sohu.com',5);
insert into users values
('tester7','tester7','tester7@sohu.com',5);
insert into users values
('tester8','tester8','tester8@sohu.com',5);
insert into users values
('tester9','tester9','tester9@sohu.com',5);
insert into users values('tester10','tester10','tester10@sohu.com',5);
insert into users values('tester11','tester11','tester11@sohu.com',5);
insert into users values('tester12','tester12','tester12@sohu.com',5);
insert into users values('tester13','tester13','tester13@sohu.com',5);
insert into users values('tester14','tester14','tester14@sohu.com',5);
select * from users;
------------------------------web.xml--------------------------------
<?xml version="1.0" encoding="UTF-8"?>
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1"
metadata-complete="true">
Welcome to Tomcat
Welcome to Tomcat
<servlet>
<servlet-name>HelloGen</servlet-name>
<servlet-class>com.tsinghua.HelloGen</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloGen</servlet-name>
<url-pattern>/sp</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>helloHttp</servlet-name>
<servlet-class>com.tsinghua.helloHttp</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>helloHttp</servlet-name>
<url-pattern>/sh</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>Login</servlet-name>
<servlet-class>com.tsinghua.Login</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>LoginCl</servlet-name>
<servlet-class>com.tsinghua.LoginCl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginCl</servlet-name>
<url-pattern>/logincl</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>wel</servlet-name>
<servlet-class>com.tsinghua.wel</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>wel</servlet-name>
<url-pattern>/welcome</url-pattern>
</servlet-mapping>
-----------------------------------文件位置-------------------------------------
mysql的jar包我也引了，然后这是sql文件位置。mysql运行没有问题。
然后文件我调试了，发现就是输入帐户名和密码后，离开登陆页面，进入登陆验证界面，进不去欢迎界面，调试后发现就是数据库连接不上。
各位大神帮帮忙，这个问题困扰很久了。。。
