简易搭建servlet登录
2019-06-16 18:28
1411 查看
1.创建项目
右键Package Explorer空白处----new----other
2.mysql的jar包引入项目
3.设置JDBC连接
新建包文件内新建db.properties
//文件内写入 jdbcName=com.mysql.jdbc.Driver dbName=数据库用户名 dbPwd=数据库密码 dbUrl=jdbc:mysql://localhost:3306/数据库名?useUnicode=true&characterEncoding=UTF-8
新建DBUtil.java
//内附代码 package xyz.xkun.Util; import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.Properties; import com.sun.xml.internal.ws.Closeable; public class DBUtil { public static Connection getConnection() { Connection connection = null; try { InputStream inputStream = DBUtil.class.getClassLoader().getResourceAsStream("db.properties"); Properties properties = new Properties(); properties.load(inputStream); String jdbcName = properties.getProperty("jdbcName"); String dbName = properties.getProperty("dbName"); String dbPwd = properties.getProperty("dbPwd"); String dbUrl = properties.getProperty("dbUrl"); Class.forName(jdbcName); connection = DriverManager.getConnection(dbUrl, dbName, dbPwd); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } return connection; } public static void close(Connection connection, PreparedStatement pStatement, ResultSet resultSet) { try { if (resultSet != null) { resultSet.close(); } if (pStatement != null) { resultSet.close(); } if (connection != null) { connection.close(); } } catch (Exception e) { // TODO: handle exception } } public static void main(String[] args) { System.out.println(getConnection()); } }
4.新建用户javabean
新建用户类
package xyz.xkun.User; public class User { private Integer uid; private String uname; private String upwd; private String uinfo; public Integer getUid() { return uid; } public void setUid(Integer uid) { this.uid = uid; } public String getUname() { return uname; } public void setUname(String uname) { this.uname = uname; } public String getUpwd() { return upwd; } public void setUpwd(String upwd) { this.upwd = upwd; } public String getUinfo() { return uinfo; } public void setUinfo(String uinfo) { this.uinfo = uinfo; } }
5.编写Servlet
@WebServlet("/login") 进行访问的地址
package xyz.xkun.servlet; /* * Servlet implementation class servlet1 */ @WebServlet("/login") public class servlet1 extends HttpServlet { private static final long serialVersionUID = 1L; @Override protected void service(HttpServletRequest request1, HttpServletResponse response2) throws ServletException, IOException { // TODO Auto-generated method stub String uname = request1.getParameter("uname"); String upwd = request1.getParameter("upwd"); System.out.println(uname + "===========" + upwd); response2.setContentType("application/json;charset=UTF-8"); if (uname.isEmpty() || upwd.isEmpty()) { response2.getWriter().write("{\"code\":0,\"msg\":\"用户名或密码为空!\"}"); return; } User user = findUserHava(uname); if (user == null) { response2.getWriter().write("{\"code\":0,\"msg\":\"没有此用户!\"}"); return; } if (!user.getUpwd().equals(upwd)) { response2.getWriter().write("{\"code\":0,\"msg\":\"用户密码错误\"}"); return; } response2.getWriter().write("{\"code\":1,\"msg\":\"恭喜你!登录成功\"}"); } static User findUserHava(String uname) { // TODO Auto-generated method stub User user = null; Connection connection = null; PreparedStatement pStatement = null; ResultSet resultSet = null; try { connection = DBUtil.getConnection(); String sql = "select * from fk_user where uname=?"; pStatement = connection.prepareStatement(sql); pStatement.setString(1, uname); resultSet = pStatement.executeQuery(); while (resultSet.next()) { user = new User(); user.setUid(resultSet.getInt("uno")); user.setUname(resultSet.getString("uname")); user.setUpwd(resultSet.getString("upwd")); user.setUinfo(resultSet.getString("uinfo")); } } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } finally { DBUtil.close(connection, pStatement, resultSet); } return user; } }
6.html文件
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <script type="text/javascript" src="statics/js/jquery-3.3.0.min.js"></script> </head> <body> <label for="uname">名称</label> <input type="text" id="uname" placeholder="请输入名称"> <label for="upwd">密码</label> <input type="password" id="upwd" placeholder="请输入密码"> <button type="button" onclick="checkForm()">提交</button> <span id="msg"></span> </body> <script> function checkForm() { var uname = $("#uname").val(); var upwd = $("#upwd").val(); if(checkTFS(uname) || checkTFS(upwd)) { console.log("用户名或密码为空!"); return; }; $.ajax({ type: "post", url: "login",//就是servlet的@WebServlet("/login"),两个相同才能互相引用 async: true, data: { uname: uname, upwd: upwd },success:function(data){ if(data.code == 1){ window.location.href="true.html" }else{ console.log(data); $("#msg").html(data.msg); } } }); } function checkTFS(str) { if(str == null || str.trim() == "") { return true; } return false; } </script> </html>
相关文章推荐
- 服务器搭建:servlet+dao+javabean+jsp实现简单的用户登录(一)
- Servlet学习:(一)使用IDEA搭建一个简易的servlet程序
- JSP+Servlet+JavaBean模式 -- 简易登录注册模型
- 服务器搭建:servlet+dao+javabean+jsp实现简单的用户登录(一)
- [简易的网上书店]基于servlet+jsp+mysql一项目搭建
- <二> 搭建struts框架并实现简易登录
- Android 搭建(Servlet)服务器端 实现用户登录
- Servlet+oracle MVC 架构 搭建简易购物车web项目---数据库设计
- servlet 不同登录用权限跳转不同页面简易实现
- servlet简易登录,(最新改进----登录失败显示在当前页面)
- servlet+jsp实现简易登录+注册
- 如何用JS与HTML搭建一个简易的登录框
- 服务器搭建:servlet+dao+javabean+jsp实现简单的用户登录
- action提交form表单,用于登录请求,servlet接收数据
- mysql 5.7.9 docker 主从设置简易搭建
- Servlet cookie自动登录
- 室内清扫机器人环境搭建与算法测试简易代码
- 从0到1学习node(七)之express搭建简易论坛
- java jsp+servlet实现登录网页设计
- Linux学习日志day2 Part1——搭建freeIPA服务器实现用户管理以及SSH服务远程登录