javaweb简单的登录注册功能实现
2017-04-27 11:57
676 查看
转载http://blog.csdn.net/qq_24473141/article/details/51363662
下面是用户登录注册流程图
登陆界面
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
function change(){
var img =document.getElementById("verify");
img.src="VerifyCodeServlet?a="+new Date().getTime();
}
</script>
</head>
<body>
<center>
<div>
<h1>欢迎登陆</h1>
<form action="LoginServlet" method="post">
<table>
<tr>
<td width="66" align="right"><font size="3">帐号：</font></td><td colspan="2"><input type="text" name="username" value="${username }" style="width:200;height:25;"/></td>
</tr>
<tr>
<td align="right"><font size="3">密码：</font></td><td colspan="2"><input type="text" name="password" style="width:200;height:25;"/></td>
</tr>
<tr>
<td align="right"><font size="3">验证码：</font></td>
<td width="108" valign="middle"><input type="text" name="verifycode" style="width:100;height:25;"/></td>
<td width="90" valign="middle"><a href="javascript:change()"><img src="VerifyCodeServlet" id="verify" border="0"></a></td>
</tr>
<tr><td colspan="3" align="center"><input type="submit" value="登录" style="width:130;height:30;"/></td></tr>
</table>
</form>
<a href="regist.jsp"><font size="2"><i>没有帐号？点击注册</i></font></a>
<font color="red" size="2"> ${msg }</font>
</div>
</center>
</body>
</html>
注册界面
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'regist.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<center>
<div>
<h1>注册</h1>
<form action="RegistServlet" method="post">
请输入帐号：<input type="text" name="username"><br/>
请输入密码：<input type="password" name="password"><br/>
请确认密码：<input type="password" name="rpsw"><br/>
<input type="submit" value="注册">
</form>
<font color="red" size="2"> ${msg }</font>
</div>
</center>
</body>
</html>
欢迎界面
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view plain
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'welcome.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<h1>这是主页</h1>
<h2>${msg }</h2>
</body>
</html>
LoginServlet
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import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.wzc.loginDao.UserDao;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
String verifyc = request.getParameter("verifycode");<span style="font-family: Arial, Helvetica, sans-serif;">//得到表单输入的内容</span>
String svc =(String) request.getSession().getAttribute("sessionverify");
String psw =new UserDao().findUsername(username);
if(!svc.equalsIgnoreCase(verifyc)){
request.setAttribute("msg", "验证码错误！");
request.getRequestDispatcher("/index.jsp").forward(request, response);
return;
}
if(psw ==null){
request.setAttribute("msg", "没有这个用户！");
request.getRequestDispatcher("/index.jsp").forward(request, response);
return;
}
if(psw!=null&&!psw.equals(password)){
request.setAttribute("msg", "密码错误请重新输入！");
request.getRequestDispatcher("/index.jsp").forward(request, response);
return;
}
if(psw.equals(password)){
request.setAttribute("msg", "用户："+username+",欢迎访问");
request.getRequestDispatcher("/welcome.jsp").forward(request, response);
//response.setHeader("Refresh","1;url=welcome.jsp");
}
}
}
RegistServlet
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import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.wzc.loginDao.UserDao;
public class RegistServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
String rpsw = request.getParameter("rpsw");//得到表单输入的内容
if(username==null||username.trim().isEmpty()){
request.setAttribute("msg", "帐号不能为空");
request.getRequestDispatcher("/regist.jsp").forward(request, response);
return;
}
if(password==null||password.trim().isEmpty()){
request.setAttribute("msg", "密码不能为空");
request.getRequestDispatcher("/regist.jsp").forward(request, response);
return;
}
if(!password.equals(rpsw)){
request.setAttribute("msg", "两次输入的密码不同");
request.getRequestDispatcher("/regist.jsp").forward(request, response);
return;
}
UserDao u = new UserDao();
u.addUser(username,password);//调用addUser（）方法
request.setAttribute("msg", "恭喜："+username+"，注册成功");
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
}
VerifyCodeServlet
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import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.wzc.utils.VerifyCode;
public class VerifyCodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
VerifyCode vc = new VerifyCode();
BufferedImage image = vc.getImage(85,23);//设置验证码图片大小
request.getSession().setAttribute("sessionverify", vc.getText());//将验证码文本保存到session域
VerifyCode.output(image, response.getOutputStream());
}
}
VerifyCode
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public class VerifyCode {
public static final char[] CHARS = { '2', '3', '4', '5', '6', '7', '8',
'9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M',
'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
public static Random random = new Random();
public String getRandomString() {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < 4; i++) {
buffer.append(CHARS[random.nextInt(CHARS.length)]);
}
return buffer.toString();
}
public Color getRandomColor() {
return new Color(random.nextInt(255), random.nextInt(255), random
.nextInt(255));
}
public Color getReverseColor(Color c) {
return new Color(255 - c.getRed(), 255 - c.getGreen(), 255 - c
.getBlue());
}
String text = getRandomString();
public String getText() {
return text;
}
public BufferedImage getImage(int width,int height ){
Color color = getRandomColor();
Color reverse = getReverseColor(color);
BufferedImage bi = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = bi.createGraphics();
g.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 20));
g.setColor(color);
g.fillRect(0, 0, width, height);
g.setColor(reverse);
g.drawString(text, 10, 22);
for (int i = 0, n = random.nextInt(80); i < n; i++) {
g.drawRect(random.nextInt(width), random.nextInt(height), 1, 1);
}
return bi;
}
public static void output(BufferedImage image, OutputStream out) throws IOException{
ImageIO.write(image, "JPEG", out);
}
}
UserDao
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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class UserDao {
public String findUsername(String username){
String psw = null;
Connection con =null;
PreparedStatement pstmt =null;
ResultSet rs = null;
try {
String driver ="com.mysql.jdbc.Driver";
String url ="jdbc:mysql://localhost:3306/zhuce";
String user ="root";
String password ="root";<span style="font-family: Arial, Helvetica, sans-serif;">//改为自己的用户名密码和数据库名</span>
Class.forName(driver);
con = DriverManager.getConnection(url, user, password);
String sql = "select * from zc where name=?";
pstmt = con.prepareStatement(sql);
pstmt.setString(1, username);
rs = pstmt.executeQuery();
if(rs==null){
return null;
}
if(rs.next()){
psw=rs.getString("password");
}else{
psw=null;
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if(pstmt!=null)pstmt.close();
if(con!=null)con.close();
}
catch (SQLException e) {
}
}
return psw;
}
public void addUser(String username,String psw){
Connection con =null;
PreparedStatement pstmt =null;
try {
String driver ="com.mysql.jdbc.Driver";
String url ="jdbc:mysql://localhost:3306/zhuce";
String user ="root";
String password ="root";//改为自己的用户名密码和数据库名
Class.forName(driver);
con = DriverManager.getConnection(url, user, password);
String sql = "INSERT INTO ZC VALUES(?,?)";
pstmt = con.prepareStatement(sql);
pstmt.setString(1, username);
pstmt.setString(2, psw);
pstmt.executeUpdate();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if(pstmt!=null)pstmt.close();
if(con!=null)con.close();
}
catch (SQLException e) {
}
}
}
//单独测试使用
//public static void main(String[] args) {
//String psw =new UserDao().findUsername("345");
//System.out.println(psw);
//UserDao u = new UserDao();
//u.addUser("345", "345");
//}
}
创建的数据库的user表有两个属性name，password 类型为varchar
点击下载源码
下面是用户登录注册流程图
登陆界面
[html]
view plain
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
function change(){
var img =document.getElementById("verify");
img.src="VerifyCodeServlet?a="+new Date().getTime();
}
</script>
</head>
<body>
<center>
<div>
<h1>欢迎登陆</h1>
<form action="LoginServlet" method="post">
<table>
<tr>
<td width="66" align="right"><font size="3">帐号：</font></td><td colspan="2"><input type="text" name="username" value="${username }" style="width:200;height:25;"/></td>
</tr>
<tr>
<td align="right"><font size="3">密码：</font></td><td colspan="2"><input type="text" name="password" style="width:200;height:25;"/></td>
</tr>
<tr>
<td align="right"><font size="3">验证码：</font></td>
<td width="108" valign="middle"><input type="text" name="verifycode" style="width:100;height:25;"/></td>
<td width="90" valign="middle"><a href="javascript:change()"><img src="VerifyCodeServlet" id="verify" border="0"></a></td>
</tr>
<tr><td colspan="3" align="center"><input type="submit" value="登录" style="width:130;height:30;"/></td></tr>
</table>
</form>
<a href="regist.jsp"><font size="2"><i>没有帐号？点击注册</i></font></a>
<font color="red" size="2"> ${msg }</font>
</div>
</center>
</body>
</html>
注册界面
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'regist.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<center>
<div>
<h1>注册</h1>
<form action="RegistServlet" method="post">
请输入帐号：<input type="text" name="username"><br/>
请输入密码：<input type="password" name="password"><br/>
请确认密码：<input type="password" name="rpsw"><br/>
<input type="submit" value="注册">
</form>
<font color="red" size="2"> ${msg }</font>
</div>
</center>
</body>
</html>
欢迎界面
[html]
view plain
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'welcome.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<h1>这是主页</h1>
<h2>${msg }</h2>
</body>
</html>
LoginServlet
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import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.wzc.loginDao.UserDao;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
String verifyc = request.getParameter("verifycode");<span style="font-family: Arial, Helvetica, sans-serif;">//得到表单输入的内容</span>
String svc =(String) request.getSession().getAttribute("sessionverify");
String psw =new UserDao().findUsername(username);
if(!svc.equalsIgnoreCase(verifyc)){
request.setAttribute("msg", "验证码错误！");
request.getRequestDispatcher("/index.jsp").forward(request, response);
return;
}
if(psw ==null){
request.setAttribute("msg", "没有这个用户！");
request.getRequestDispatcher("/index.jsp").forward(request, response);
return;
}
if(psw!=null&&!psw.equals(password)){
request.setAttribute("msg", "密码错误请重新输入！");
request.getRequestDispatcher("/index.jsp").forward(request, response);
return;
}
if(psw.equals(password)){
request.setAttribute("msg", "用户："+username+",欢迎访问");
request.getRequestDispatcher("/welcome.jsp").forward(request, response);
//response.setHeader("Refresh","1;url=welcome.jsp");
}
}
}
RegistServlet
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import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.wzc.loginDao.UserDao;
public class RegistServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
String rpsw = request.getParameter("rpsw");//得到表单输入的内容
if(username==null||username.trim().isEmpty()){
request.setAttribute("msg", "帐号不能为空");
request.getRequestDispatcher("/regist.jsp").forward(request, response);
return;
}
if(password==null||password.trim().isEmpty()){
request.setAttribute("msg", "密码不能为空");
request.getRequestDispatcher("/regist.jsp").forward(request, response);
return;
}
if(!password.equals(rpsw)){
request.setAttribute("msg", "两次输入的密码不同");
request.getRequestDispatcher("/regist.jsp").forward(request, response);
return;
}
UserDao u = new UserDao();
u.addUser(username,password);//调用addUser（）方法
request.setAttribute("msg", "恭喜："+username+"，注册成功");
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
}
VerifyCodeServlet
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import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.wzc.utils.VerifyCode;
public class VerifyCodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
VerifyCode vc = new VerifyCode();
BufferedImage image = vc.getImage(85,23);//设置验证码图片大小
request.getSession().setAttribute("sessionverify", vc.getText());//将验证码文本保存到session域
VerifyCode.output(image, response.getOutputStream());
}
}
VerifyCode
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public class VerifyCode {
public static final char[] CHARS = { '2', '3', '4', '5', '6', '7', '8',
'9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M',
'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
public static Random random = new Random();
public String getRandomString() {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < 4; i++) {
buffer.append(CHARS[random.nextInt(CHARS.length)]);
}
return buffer.toString();
}
public Color getRandomColor() {
return new Color(random.nextInt(255), random.nextInt(255), random
.nextInt(255));
}
public Color getReverseColor(Color c) {
return new Color(255 - c.getRed(), 255 - c.getGreen(), 255 - c
.getBlue());
}
String text = getRandomString();
public String getText() {
return text;
}
public BufferedImage getImage(int width,int height ){
Color color = getRandomColor();
Color reverse = getReverseColor(color);
BufferedImage bi = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = bi.createGraphics();
g.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 20));
g.setColor(color);
g.fillRect(0, 0, width, height);
g.setColor(reverse);
g.drawString(text, 10, 22);
for (int i = 0, n = random.nextInt(80); i < n; i++) {
g.drawRect(random.nextInt(width), random.nextInt(height), 1, 1);
}
return bi;
}
public static void output(BufferedImage image, OutputStream out) throws IOException{
ImageIO.write(image, "JPEG", out);
}
}
UserDao
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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class UserDao {
public String findUsername(String username){
String psw = null;
Connection con =null;
PreparedStatement pstmt =null;
ResultSet rs = null;
try {
String driver ="com.mysql.jdbc.Driver";
String url ="jdbc:mysql://localhost:3306/zhuce";
String user ="root";
String password ="root";<span style="font-family: Arial, Helvetica, sans-serif;">//改为自己的用户名密码和数据库名</span>
Class.forName(driver);
con = DriverManager.getConnection(url, user, password);
String sql = "select * from zc where name=?";
pstmt = con.prepareStatement(sql);
pstmt.setString(1, username);
rs = pstmt.executeQuery();
if(rs==null){
return null;
}
if(rs.next()){
psw=rs.getString("password");
}else{
psw=null;
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if(pstmt!=null)pstmt.close();
if(con!=null)con.close();
}
catch (SQLException e) {
}
}
return psw;
}
public void addUser(String username,String psw){
Connection con =null;
PreparedStatement pstmt =null;
try {
String driver ="com.mysql.jdbc.Driver";
String url ="jdbc:mysql://localhost:3306/zhuce";
String user ="root";
String password ="root";//改为自己的用户名密码和数据库名
Class.forName(driver);
con = DriverManager.getConnection(url, user, password);
String sql = "INSERT INTO ZC VALUES(?,?)";
pstmt = con.prepareStatement(sql);
pstmt.setString(1, username);
pstmt.setString(2, psw);
pstmt.executeUpdate();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally {
try {
if(pstmt!=null)pstmt.close();
if(con!=null)con.close();
}
catch (SQLException e) {
}
}
}
//单独测试使用
//public static void main(String[] args) {
//String psw =new UserDao().findUsername("345");
//System.out.println(psw);
//UserDao u = new UserDao();
//u.addUser("345", "345");
//}
}
创建的数据库的user表有两个属性name，password 类型为varchar
点击下载源码
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