Java Web简单的注册登陆界面（mysql+servlet+jsp）
2017-05-12 20:18
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通过一段时间Java Web的学习，写一个简单的注册登陆界面来做个总结，也方便与大家分享交流。
首先我们先写一个UserBean，代码如下：
package com.szx.jnmc;
public class User {
private String username;
private String userpass;
private int role;
private int lognum;
private String regtime;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getUserpass() {
return userpass;
}
public void setUserpass(String userpass) {
this.userpass = userpass;
}
public int getRole() {
return role;
}
public void setRole(int role) {
this.role = role;
}
public int getLognum() {
return lognum;
}
public void setLognum(int lognum) {
this.lognum = lognum;
}
public String getRegtime() {
return regtime;
}
public void setRegtime(String regtime) {
this.regtime = regtime;
}
}这段代码用来对user进行数据的封装。
下面再写一个数据库连接类DBOper 这个类具有连接数据库以及增删改（executeUpdate）查（executeQuery）的功能，以便于AddUserServlet的调用
package com.szx.jnmc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DBOper {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
//打开连接
public Connection getConn(String server,String dbname,String dbuser,String dbpwd){
String DRIVER = "com.mysql.jdbc.Driver";
String URL = "jdbc:mysql://"+server+":3306/"+dbname+"?user="+dbuser+"&password="+dbpwd+"&useUnicode=true&characterEncoding=utf8";
try{
Class.forName(DRIVER);
conn = DriverManager.getConnection(URL);
}catch(Exception e){
e.printStackTrace();
}
return conn;
}
//关闭连接
public void closeAll(){
try{
if(rs != null){
rs.close();
}
}catch(SQLException e){
e.printStackTrace();
}finally{
try{
if(ps != null){
ps.close();
}
}catch(SQLException e){
e.printStackTrace();
}finally{
try{
if(conn != null){
conn.close();
}
}catch (SQLException e){
e.printStackTrace();
}
}
}
}
//执行sql语句，可以进行查询
public ResultSet executeQuery(String preparedSql,String []param){
try{
ps = conn.prepareStatement(preparedSql);
if(param != null){
for (int i = 0; i < param.length; i++) {
ps.setString(i + 1, param[i]);
}
}
rs = ps.executeQuery();
}catch(SQLException e){
e.printStackTrace();
}
return rs;
}
//执行sql语句，增加，修改，删除
public int executeUpdate(String preparedSql,String[]param){
int num = 0;
try{
ps = conn.prepareStatement(preparedSql);
if(ps != null){
for (int i = 0; i < param.length; i++) {
ps.setString(i + 1, param[i]);
}
}
num = ps.executeUpdate();
}catch(SQLException e){
e.printStackTrace();
}
return num;
}
}数据库连接类写完之后，继续写一个UserDao，这个类主要功能是对用户进行增删改查 ，虽然是一个简单的登录界面，但是考虑到后面的开发，所以就直接把删改查的功能也一并实现了，代码如下：
package com.szx.jnmc;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class UserDao extends DBOper{
//获取用户列表
public List<User> getUser(){
List<User>userList = new ArrayList<User>();
User user = new User();
String sql = "SELECT * FROM tb_user";
try{
ResultSet rs = this.executeQuery(sql,null);
while(rs.next()){
user.setUsername(rs.getString("username"));
user.setUserpass(rs.getString("userpass"));
user.setLognum(rs.getInt("lognum"));
user.setRegtime(rs.getString("regtime"));
user.setRole(rs.getInt("role"));
userList.add(user);
}
}catch(SQLException e){
e.printStackTrace();
}finally{
this.closeAll();
}
return userList;
}
//根据用户名获取用户
public User getUserByName(String name){
User user = null;
String sql = "SELECT * FROM tb_user WHERE username = ?";
try{
ResultSet rs = this.executeQuery(sql, new String[]{name});
if(rs.next()){
user = new User();
user.setUsername(rs.getString("username"));
user.setUserpass(rs.getString("userpass"));
user.setRole(rs.getInt("role"));
user.setLognum(rs.getInt("lognum"));
user.setRegtime(rs.getString("regtime"));
}
}catch(SQLException e){
e.printStackTrace();
}finally{
this.closeAll();
}
return user;
}
//修改用户信息
public boolean editUser(User user){
boolean r = false;
String sql = "UPDATE tb_user SET userpass = ?,role = ?,regtime = ?,lognum = ? WHERE username = ?";
try{
int num = this.executeUpdate(sql, new String[]{user.getUserpass(),""+user.getRole(),""+user.getLognum(),user.getRegtime(),user.getUsername()});
if(num > 0){
r = true;
}
}catch(Exception e){
e.printStackTrace();
}finally{
this.closeAll();
}
return r;
}
//添加用户
public boolean addUser(User user){
boolean r = false;
String sql = "INSERT INTO tb_user(username,userpass,role,regtime)VALUES(?,?,?,?) ";
try{
int num = this.executeUpdate(sql,new String[]{user.getUsername(),user.getUserpass(),""+user.getRole(),user.getRegtime()});
if(num > 0){
r = true;
}
}catch(Exception e){
e.printStackTrace();
}finally{
this.closeAll();
}
return r;
}
//删除指定用户
public boolean delUser(String name){
boolean r = false;
String sql = "DELETE FROM tb_user WHERE username = ?";
try{
int num = this.executeUpdate(sql,new String[]{name});
if(num > 0){
r = true;
}
}catch(Exception e){
e.printStackTrace();
}finally{
this.closeAll();
}
return r;
}
}我们先写注册部分，addUser.jsp用来接收用户的输入。抛开各种样式，直接用最原始的样式呈现吧，代码如下：
<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GBK"> <title>添加用户页面</title> </head> <body> <form action = "AddUserServlet" method = "POST"> 用户名:<input type = "text" name = "username"> 密码:<input type = "password" name = "userpass"> <input type = "submit" value = "注册"> <input type = "reset" value = "重置"> </form> </body> </html>
效果如下图，太丑了，仅作分享交流，不喜勿喷
这里有一个地方需要注意，就是页面的字符编码设置统一为GBK
下面写我们的AddUserServlet，不多说，直接贴代码：
package com.szx.jnmc;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class AddUserServlet
*/
@WebServlet("/AddUserServlet")
public class AddUserServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public AddUserServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("GBK");
response.setContentType("text/html;charset = GBK");
String username = request.getParameter("username");
String userpass = request.getParameter("userpass");
//String role = request.getParameter("role");
Date curTime = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
String regtime = sdf.format(curTime);
PrintWriter out = response.getWriter();
ServletContext ctx = this.getServletContext();
String server = ctx.getInitParameter("server");
String dbname = ctx.getInitParameter("dbname");
String dbuser = ctx.getInitParameter("dbuser");
String dbpwd = ctx.getInitParameter("dbpwd");
User user = new User();
user.setUsername(username);
user.setUserpass(userpass);
user.setRegtime(regtime);
//user.setRole(Integer.parseInt(role));
UserDao dao = new UserDao();
dao.getConn(server, dbname, dbuser, dbpwd);
if(dao.addUser(user)){
out.print("注册成功！");
}
else{
out.print("注册失败！");
}
}
}接下来我们写登陆部分，login.jsp代码如下：
<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GBK"> <title>登陆页面</title> </head> <body> <form method = "POST" action = "LoginServlet"> 用户名：<input type = "text" name = "username"> 密码：<input type = "password" name = "userpass"> <input type = "submit" value = "登陆"> <input type = "reset" value = "重置"> </form> </body> </html>
登录页面如下：
LoginServlet代码如下：
package com.szx.jnmc;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
* Servlet implementation class LoginServlet
*/
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LoginServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("GBK");
response.setContentType("text/html;charset = GBK");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
String userpass = request.getParameter("userpass");
ServletContext ctx = request.getServletContext();
String server = ctx.getInitParameter("server");
String dbname = ctx.getInitParameter("dbname");
String dbuser = ctx.getInitParameter("dbuser");
String dbpwd = ctx.getInitParameter("dbpwd");
DBOper db = new DBOper();
db.getConn(server, dbname, dbuser, dbpwd);
String sql = "SELECT username,userpass,role FROM tb_user WHERE username = ? AND userpass = ?";
ResultSet rs = db.executeQuery(sql,new String[]{username,userpass});
try {
if(rs != null && rs.next()){
HttpSession session = request.getSession();
session.setAttribute("username",username);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
String logtime = sdf.format(new Date());
session.setAttribute("logtime",logtime);
Cookie cookie = new Cookie("username",username);
cookie.setMaxAge(60*60*24*30);
response.addCookie(cookie);
RequestDispatcher dispatcher = request.getRequestDispatcher("MainServlet");
dispatcher.forward(request,response);
}else{
out.print("登录失败");
out.print("<br><a href = 'login.jsp'>重新登陆</a>");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void init()throws ServletException {
}
}LoginServlet里的MianServlet用来显示登陆成功的信息，登陆失败则跳转到login.jsp重新登陆，MainServlet的代码如下：
package com.szx.jnmc;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
* Servlet implementation class MainServlet
*/
@WebServlet("/MainServlet")
public class MainServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public MainServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("GBK");
response.setContentType("text/html;charaset = GBK");
PrintWriter out = response.getWriter();
HttpSession session = request.getSession();
String username = (String)session.getAttribute("username");
String logtime = (String)session.getAttribute("logtime");
out.println("登录名:"+username+" 登陆时间:"+logtime);
out.println("欢迎"+username);
}
}到此我们还有最重要的一步，就是在web.xml里配置我们的项目，web.xml代码如下：
<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>20170512</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <context-param> <param-name>server</param-name> <param-value>localhost</param-value> </context-param> <context-param> <param-name>dbname</param-name> <param-value>A20170512</param-value> </context-param> <context-param> <param-name>dbuser</param-name> <param-value>root</param-value> </context-param> <context-param> <param-name>dbpwd</param-name> <param-value>123456</param-value> </context-param> <servlet> <display-name>AddUserServlet</display-name> <servlet-name>AddUSerServlet</servlet-name> <servlet-class>com.szx.jnmc.AddUserServlet</servlet-class> </servlet> <servlet> <display-name>LoginServlet</display-name> <servlet-name>LoginServlet</servlet-name> <servlet-class>com.szx.jnmc.LoginServlet</servlet-class> </servlet> </web-app>
当然，配置文件容易出现问题，例如在刚开始的时候项目里并没有web.xml，所以我们不妨在创建项目的时候就直接带上，步骤如下：
1.新建项目
2.next
3.勾选√
这时候，项目的/0512/WebContent/WEB-INF/目录下就会出现web.xml文件
还有一步就是要把jdbc连接数据库（mysql）的jar包复制到/20170512/WebContent/WEB-INF/lib目录下，这样才能连接保证连接到数据库
到此有必要贴出项目的目录结构：
数据库需要自己创建，如图所示：
项目的下载地址：
CSDN下载中心：http://download.csdn.net/detail/itcreater000/9841194如果csdn里下载不到，可留言！
到此就结束了我们的项目，欢迎大家提出宝贵的建议改进方案！
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
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