先说说Struts2.5版本之后吧，Struts2可能觉得安全不够，要提高安全强度，然后现在的struts.xml里面你必须要加一个<allow-methods>,

-1，先看web.xml，配置过滤器的时候在2.5跟前面的不一样，最好还是用Ctrl+shift+t来寻找

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://xmlns.jcp.org/xml/ns/javaee"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"id="WebApp_ID" version="3.1"><welcome-file-list><welcome-file>index.html</welcome-file><welcome-file>index.jsp</welcome-file></welcome-file-list><filter><filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class></filter><filter-mapping><filter-name>struts2</filter-name><url-pattern>*.action</url-pattern></filter-mapping></web-app>

0.我用的maven，先看看pom.xml，搭建自己的骨架可以看看我另一个博客http://blog.csdn.net/shouldnotappearcalm/article/details/52353712

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.nsu</groupId><artifactId>ClassStudyStruts2_01</artifactId><version>0.0.1-SNAPSHOT</version><packaging>war</packaging><dependencies><!-- https://mvnrepository.com/artifact/org.apache.struts/struts2-core --><dependency><groupId>org.apache.struts</groupId><artifactId>struts2-core</artifactId><version>2.5.5</version></dependency><!-- https://mvnrepository.com/artifact/commons-logging/commons-logging --><dependency><groupId>commons-logging</groupId><artifactId>commons-logging</artifactId><version>1.2</version></dependency><!-- https://mvnrepository.com/artifact/org.freemarker/freemarker --><dependency><groupId>org.freemarker</groupId><artifactId>freemarker</artifactId><version>2.3.23</version></dependency><!-- https://mvnrepository.com/artifact/org.apache.struts.xwork/xwork-core --><dependency><groupId>org.apache.struts.xwork</groupId><artifactId>xwork-core</artifactId><version>2.3.32</version></dependency><!-- https://mvnrepository.com/artifact/ognl/ognl --><dependency><groupId>ognl</groupId><artifactId>ognl</artifactId><version>3.1.14</version></dependency><!-- https://mvnrepository.com/artifact/commons-lang/commons-lang --><dependency><groupId>commons-lang</groupId><artifactId>commons-lang</artifactId><version>2.5</version></dependency><!-- https://mvnrepository.com/artifact/jstl/jstl --><dependency><groupId>jstl</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.32</version></dependency></dependencies></project>

1.现在来看看struts.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN""http://struts.apache.org/dtds/struts-2.5.dtd">
<struts><package name="gzr" namespace="/" extends="struts-default"><global-allowed-methods>regex:.*</global-allowed-methods><action name="user_*" class="com.nsu.edu.action.UserAction" method="{1}"><result name="loginSuccess">/index.jsp</result><result name="loginFail">/login.jsp</result><result name="edit">/edit.jsp</result><result name="registerSuccess">/login.jsp</result><result name="registerFail">/register.jsp</result></action></package></struts>

你也可以像我一样<global-allowed-methods>regex:.*</global-allowed-methods>
这里使用regex:.*亲测有效.struts2.5dtd这个还是在struts-core.jar里面找到struts-default.xml里面拷出来。
*这里使用通配符，user_ method=”{1}” {1}这里是通配符
如果是user_login 会调用login方法
如果是user_*_* method=”{1}_{1}”
如果是user_test1_test2 会调用test1_test2方法**

2.现在来看UserAction

package com.nsu.edu.action;import java.util.List;import com.nsu.edu.model.User;
import com.nsu.edu.service.UserService;
import com.nsu.edu.service.impl.UserServiceImpl;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;public class UserAction extends ActionSupport implements ModelDriven<User>{User user=new User();UserService userService=new UserServiceImpl();private String errorMessage;/*** 业务组件* @return*/public String login(){System.out.println(user.getName()+","+user.getPassword());List<User> selectUserList=userService.login(user);if(selectUserList.size()==1){return "loginSuccess";}else{errorMessage="用户名密码错了";return "loginFail";}}public String register(){System.out.println(user.getName()+","+user.getPassword());int count=userService.regist(user);if(count>0){return "registerSuccess";}else{return "registerFail";}}public String edit(){return "edit";}public String getErrorMessage() {return errorMessage;}public void setErrorMessage(String errorMessage) {this.errorMessage = errorMessage;}@Overridepublic User getModel() {// TODO Auto-generated method stubreturn user;}}

3.接下来看看数据库连接工具，你们链接自己的

package com.nsu.edu.util;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;public class DBHelper {private static final String DBDRIVER = "com.mysql.jdbc.Driver";private static final String DATABASE_URL = "jdbc:mysql://localhost:3306/javaweb";private static final String USERNAME = "root";private static final String PASSWORD = "123";private Connection conn;public DBHelper() {try {Class.forName(DBDRIVER);conn = DriverManager.getConnection(DATABASE_URL, USERNAME, PASSWORD);} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public Connection getConnection(){return this.conn;}public void close(){if(conn!=null){try {conn.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

4.接下来就看看Dao层，没什么好解释的，很简单

package com.nsu.edu.dao;import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;import com.nsu.edu.model.User;
import com.nsu.edu.util.DBHelper;public class UserDao {private DBHelper dbHelper;private Connection connection;public UserDao() {dbHelper=new DBHelper();// TODO Auto-generated constructor stub}/*** @param user* @return*/public List<User> selectUserByNameAndPassword(User user){List<User> selectList=new ArrayList<User>();String sql="select * from user where name=? and password=?";try {connection=dbHelper.getConnection();PreparedStatement preparedStatement=connection.prepareStatement(sql);preparedStatement.setString(1, user.getName());preparedStatement.setString(2, user.getPassword());ResultSet resultSet=preparedStatement.executeQuery();while(resultSet.next()){User selectUser=new User(resultSet.getInt("id"),resultSet.getString("name"),resultSet.getString("password"));selectList.add(selectUser);}} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally {closeConnection();}return selectList;}public int addUser(User user){String sql="insert into user(name,password) values(?,?)";int count=0;try {connection=dbHelper.getConnection();PreparedStatement preparedStatement=connection.prepareStatement(sql);preparedStatement.setString(1, user.getName());preparedStatement.setString(2, user.getPassword());count=preparedStatement.executeUpdate();} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally {closeConnection();}return count;}public void closeConnection() {if (connection != null) {try {connection.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

5.这里还没用Spring，还是new吧。接下来是service层的代码

package com.nsu.edu.service;import java.util.List;import com.nsu.edu.model.User;public interface UserService {public List<User> login(User user);public int regist(User user);}

6.UserService写的是接口，现在写实现类

package com.nsu.edu.service.impl;import java.util.List;import com.nsu.edu.dao.UserDao;
import com.nsu.edu.model.User;
import com.nsu.edu.service.UserService;public class UserServiceImpl implements UserService{private UserDao userDao;public UserServiceImpl() {userDao=new UserDao();}@Overridepublic List<User> login(User user) {// TODO Auto-generated method stubreturn userDao.selectUserByNameAndPassword(user);}@Overridepublic int regist(User user) {// TODO Auto-generated method stubreturn userDao.addUser(user);}}

7.Mode层的User

package com.nsu.edu.model;public class User {private Integer id;private String name;private String password;public User() {super();// TODO Auto-generated constructor stub}public User(Integer id, String name, String password) {this();this.id = id;this.name = name;this.password = password;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}

8.数据库建表的就不说了，很简单的，但是接的id列我设置了auto_increment.

9.下面是几个页面
login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body><c:if test="${errorMessage !=null}">${errorMessage }</c:if><form action="user_login.action"><input type="text" name="name" value="" /><input type="password" name="password" value="" /><button type="submit">登陆</button></form>
</body>
</html>

register.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body><form action="user_register.action" method="post">姓名：<input type="text" name="name" />密码：<input type="password" name="password" /><input type="submit" value="注册"/></form>
</body>
</html>

index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>index${name }
</body>
</html>

以上就是全部的代码了，基本还是很简单的，记得使用通配符，真的好用，还有就是struts2.5版本记得配置allow-methods，低于2.5的就不用管了，还有就是昨晚写了会电脑就没电了（人傻钱多戴），eclipse还是有点问题的，刚开始写的我用tomcat编译感觉没有真的便宜，一直找不到方法，今早重启电脑看到报了两个错，但是昨晚没报错，真的坑。

有问题的下方留言。