Struts2+mysql登录验证实例

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目录结构

  • 建立login.jsp：

<%@ page language="java" pageEncoding="UTF-8" %><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><title>请登录</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body> <h1> 请输入 </h1> <s:form action = "login" method = "post" > <s:textfield key = "username"></s:textfield> <s:password key = "password"></s:password> <s:submit value = "登录"></s:submit> </s:form></body></html>

  • 建立main.jsp为登录成功跳转的页面:

<%@ page language="java" pageEncoding="UTF-8" %><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><title>主页面</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body> <h1> <s:property value = "username"/>你登录了主页面 </h1></body></html>

  • error.jsp为没能登陆跳转的页面:

<%@ page language="java" pageEncoding="UTF-8" %><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><title>错误</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body> <h1> 你没能登录，这是错误页面。 </h1></body></html>

页面已经创建好了，接下来action处理页面传来的数据，创建LoginAction：

package controller;
import java.util.ArrayList;
import business.LoginHandler;
import com.opensymphony.xwork2.ActionSupport;
/**@author:micro_hz2015年8月12日 */
public class LoginAction extends ActionSupport{ String username; String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public String execute() throws Exception { // TODO Auto-generated method stub ArrayList<String> userList = new ArrayList<String>(); userList.add(username); userList.add(password); LoginHandler login = new LoginHandler(); boolean mark = login.checkLogin(userList); if(mark) return SUCCESS; else return ERROR; }}

  • 其中调用业务逻辑LoginHandler完成用户的验证:

package business;
import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.Set;
import dao.Dao;
/**@author:micro_hz2019年3月11日 */public class LoginHandler { public boolean checkLogin(ArrayList list) { String user = (String)list.get(0); String password = (String)list.get(1); boolean rt = false;
 try { Dao dao = new Dao(); Connection conn = dao.getConnection(); PreparedStatement p = conn.prepareStatement("select * from test"); ResultSet rs = p.executeQuery(); HashMap<String,String> hm = new HashMap(); while(rs.next()) { hm.put(rs.getString("username"), rs.getString("password")); } dao.close(rs, p, conn); Set<String> set = hm.keySet(); Iterator it = set.iterator(); while(it.hasNext()) { if(it.next().equals(user)) {
 if(password.equals(hm.get(user))) { rt = true; break; } } } } catch(SQLException e) { System.out.println("数据库出问题"); } return rt; }}

然后是struts.xml配置LoginAction与返回后页面跳转：

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"><struts> <package name="struts" extends="struts-default"> <action name="login" class="controller.LoginAction"> <result name="success">/main.jsp</result> <result name="error">/error.jsp</result> </action> </package></struts>

  • web.xml配置拦截器和初始页面：

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>login.jsp</welcome-file> </welcome-file-list></web-app>

  • 数据访问层：Dao 

package dao;
import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;
import javax.swing.text.html.HTMLDocument.HTMLReader.PreAction;
public class Dao { public Connection getConnection() { String url = "jdbc:mysql://localhost:3306/micro"; String username = "root"; String password = "root"; Connection conn = null; try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection(url, username, password); } catch(ClassNotFoundException e) { System.out.println("驱动加载出错"); } catch(SQLException e) { System.out.println("数据库连接出错"); } return conn;
 } public void close(ResultSet rs,PreparedStatement p,Connection conn) { try { rs.close(); p.close(); conn.close(); } catch(SQLException e) { System.out.println("数据库关闭出错"); } }}

建立的micro数据库，表为test，结构如下：

需要的jar包：  联系作者   发链接工具包 

PS:之前一直报告Dispatcher not inistailled，后来将jar包删除(除mysql-java-connector.jar外)重新导入了\struts-2.3.24\apps下struts-blank里面示例的jar包成功解决问题。 

jsp中使用struts的taglib配置

<%@ taglib prefix="s" uri="/struts-tags" %>

顺序不能颠倒，否则无效。

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