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package cn.servlet;

import java.io.IOException;
import java.sql.SQLException;

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

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;

import cn.Utils.JDBCUtils;
import cn.Utils.User;

public class llogin extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username=request.getParameter("username");
String password=request.getParameter("password");
User lo = login(username,password);
if(lo!=null){
response.sendRedirect("http://www.baidu.com");//重定向
}
else{
request.getRequestDispatcher("Login.jsp").forward(request, response);//转发当前web跳转
}
}
public User login(String username,String password){
QueryRunner qu = new QueryRunner(JDBCUtils.getDataSource());
String sql="select * from user where username=? and password=?";
User query=null;
try {
query = qu.query(sql, new BeanHandler<User>(User.class),username,password);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return query;
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doGet(request, response);
}

}

注册

package cn.servlet;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.sql.SQLException;
import java.util.Map;
import java.util.UUID;

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

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.dbutils.QueryRunner;

import cn.Utils.JDBCUtils;
import cn.Utils.User;

public class zhuce extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
Map<String, String[]> pro = request.getParameterMap();
User u=new User();
try {
BeanUtils.populate(u, pro);
} catch (IllegalAccessException | InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
u.setDis(UUID.randomUUID().toString());
regg(u);
response.sendRedirect(request.getContextPath()+"/login.html");
}
public void regg(User u){
QueryRunner qu=new QueryRunner(JDBCUtils.getDataSource());
String sql="insert into user(dis,username,password,phone) values(?,?,?,?)";
try {
int s = qu.update(sql,u.getDis(),u.getUsername(),u.getPassword(),u.getPhone());
System.out.println(s);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doGet(request, response);
}

}