javaWeb连接数据库实现简单登陆注册功能的全过程
目录
- 实现步骤
- jar包
- 数据库的驱动以及用户密码
- jsp页面
- 注册页面
- 登陆成功和失败的页面
- 工具类
- 登陆的类
- 注册的类
- 两个映射路径
- 思路
- 登陆
- 注册
- 总结
实现步骤
创建maven项目 配置Tomcat 这些都不细说了
jar包
因为要连接数据库所以一定要在maven项目下的xml文件下配置数据库的jar包依赖
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.28</version> </dependency>
这个千万不要忘了 重重之重
数据库的驱动以及用户密码
package com.li.Servlet.blit; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; public class JDBC { private static String url = null; private static String name = null; private static String password = null; static { try { Class.forName ( "com.mysql.cj.jdbc.Driver" ); } catch (Exception e) { e.printStackTrace ( ); } url = "jdbc:mysql://localhost:3306/zhiqingli?useUnicode=true&characterEncoding=utf8&useSSL=true"; name = "root"; password = "root"; } public static Connection getConn() throws Exception { return DriverManager.getConnection ( url, name, password ); } public static void release(Connection conn, PreparedStatement pst, ResultSet res) { try { if (res != null) { res.close ( ); } if (pst != null) { pst.close ( ); } if (conn != null) { conn.close ( ); } } catch (Exception e) { e.printStackTrace ( ); } } }
这个类可以直接复制使用,但要改成自己的数据库名字
jsp页面
登陆页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <body> <form action="${pageContext.request.contextPath}/test" method="get"> <h3>账号:<input type="text" name="account"></h3> <h3>密码:<input type="password" name="paw"></h3> <h3><input type="submit" value="登陆"><a href="Register.jsp" rel="external nofollow" target="_blank">注册</a></h3> </form> </body> </html>
注册页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>注册</title> </head> <body> <form action="${pageContext.request.contextPath}/res" method="post"> <h3>账号:<input type="text" placeholder="请输入注册的账号" name="number"></h3> <h3>密码:<input type="password" placeholder="请输入注册的密码" name="word" id="one"></h3> <h3>确认密码:<input type="password" placeholder="确认一遍密码" name="u" id="two"></h3> <input type="submit" value="提交" οnclick="show()"> </form> <Script> function show(){ var one = document.getElementById("one").value; var two = document.getElementById("two").value; if (one === two){ alert("注册成功"); window.open("index.jsp") }else { alert("两次输入的密码不一致"); } } </Script> </body> </html>
登陆成功和失败的页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>成功页面</title> </head> <body> <h1>登陆成功,感谢使用</h1> </body> </html> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>失败页面</title> </head> <body> <h1>登陆失败,账号密码找不到或者错误</h1> </body> </html>
工具类
工具人上线
//登陆使用的方法 Connection conn = null; PreparedStatement pst = null; ResultSet res = null; boolean isQ; public boolean Select(String username,String paw) { try { conn = JDBC.getConn ( ); String sql = "SELECT * FROM `username` where `name`=? and `password`=?"; pst = conn.prepareStatement (sql); pst.setObject ( 1,username ); pst.setObject ( 2,paw ); res = pst.executeQuery ( ); if (res.next ()){ isQ = true; System.out.println (res.getObject ( "name" )+" "+res.getObject ( "password" )); System.out.println ("登陆成功"); }else { isQ = false; System.out.println ("登陆失败"); } }catch (Exception e){ e.printStackTrace (); }finally { JDBC.release ( conn,pst,res ); } return isQ; } //注册用的方法 public void addUser(String name,String paw){ try { conn = JDBC.getConn ( ); String sql = "insert into `username`(`name`,`password`) values (?,?)"; pst = conn.prepareStatement ( sql ); pst.setObject ( 1,name ); pst.setObject ( 2,paw ); int i = pst.executeUpdate ( ); if (i>0){ System.out.println ("添加成功"); } }catch (Exception e){ e.printStackTrace (); }finally { JDBC.release ( conn,pst,res ); } }
登陆的类
package com.li.Servlet.test; import com.li.Servlet.blit.Way; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; public class index extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String account = req.getParameter ( "account" ); String paw = req.getParameter ( "paw" ); Way way = new Way (); if (way.Select ( account,paw )){ resp.sendRedirect ( "/s4/true.jsp" ); }else { resp.sendRedirect ( "/s4/false.jsp" ); } } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet ( req, resp ); } }
注册的类
package com.li.Servlet.test; import com.li.Servlet.blit.Way; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; public class index02 extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String number = req.getParameter ( "number" ); String word = req.getParameter ( "word" ); String u = req.getParameter ( "u" ); if (word.equals ( u )){ Way way = new Way ( ); way.addUser ( number,word ); }else { //当两次密码不一致的时候浏览器响应给用户当前注册的页面 resp.sendRedirect ( "/s4/Register.jsp" ); } } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet ( req, resp ); } }
两个映射路径
<!--登陆--> <servlet> <servlet-name>test</servlet-name> <servlet-class>com.li.Servlet.test.index</servlet-class> </servlet> <servlet-mapping> <servlet-name>test</servlet-name> <url-pattern>/test</url-pattern> </servlet-mapping> <!--注册--> <servlet> <servlet-name>res</servlet-name> <servlet-class>com.li.Servlet.test.index02</servlet-class> </servlet> <servlet-mapping> <servlet-name>res</servlet-name> <url-pattern>/res</url-pattern> </servlet-mapping>
思路
登陆
这个就是用户输入的账号和密码看看数据库里有没有,有的话就重定向到成功或这失败的页面,相当于浏览器响应给用户的请求结果
注册
相当于就是往数据库里面添加一个账号或者密码然返回到登陆页面
这里我在注册类面没有用到重定向,而是在注册的jsp页面里判断之后跳转到登陆页面
注意:这里为什么没在注册类里面用重定向
因为使用重定向之后就直接返回了登陆类运行的结果
总结
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