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[Java教程]Struts2框架实现简单的用户登入


Struts框架汲取了Struts的优点,以WebWork为核心,拦截器,可变和可重用的标签。

第一步:加载Struts2 类库:

第二步:配置web.

<?   ="http://java.sun.com/   ="http://www.w3.org/2001/   xsi:schemaLocation="http://java.sun.com///java.sun.com/ <welcome-file-list>  <welcome-file>index.jsp</welcome-file> </welcome-file-list>  <!-- 配置Struts2过滤器 :拦截请求 --> <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><!--'/*' 过滤所有请求 --> </filter-mapping> </web-app>

第三步:开发视图层页面(提交表单页)

<%@ 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>Struts2Demo</title>   </head>  <body>  <h1>HelloWorld Struts2</h1>  <hr>  <form action="LonginAction" method="post">    <p>用户名:<input type="text" name="username" /></p>    <p>密  码:<input type="password" name="password" /></p>    <p><input type="submit" /></p>  </form> </body></html>

四:三层架构:
package dao;/** * 用户操作接口 * @author Administrator * */public interface UserDao {    public String login(String username,String password);}

package biz;/** * 用户业务接口 * @author Administrator * */public interface UserBiz {    public String login(String username,String password);}

package biz.impl;import biz.UserBiz;import dao.UserDao;import dao.UserDaoImpl;public class UserBizImpl implements UserBiz {    //创建dao层对象  UserDao userdao = new UserDaoImpl();    /**   * 调用dao层方法   */    public String login(String username, String password) {        return userdao.login(username, password);  }}

package dao;public class UserDaoImpl implements UserDao {  public String login(String username, String password) {    String str = "";    if(username.equals("msit") && password.equals("123456")){      str = "success";    }else{      str = "error";    }        // TODO Auto-generated method stub    return str;  }}

第五步:开发控制层Action

package Action;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import biz.UserBiz;import biz.impl.UserBizImpl;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;/** * 登录控制器 * @author Administrator * */public class LoginAction extends ActionSupport{    /*值栈:页面可以直接获取*/  String username;//form表单name;进行封装  String password;//form表单name;进行封装    //创建Biz层对象  UserBiz userbiz = new UserBizImpl();          /* (non-Javadoc)   * @see com.opensymphony.xwork2.ActionSupport#execute()   */  @Override  public String execute() throws Exception {    // TODO Auto-generated method stub    System.out.println(username+"==="+password);        /*解耦(降低依赖)方式;基于Map集合*/    ActionContext ac = ActionContext.getContext();    /*得到request*/    Map request = (Map) ac.get("request");    //request.put("username", username);    /*得到session*/    Map session = ac.getSession();    /*得到application*/    Map application = ac.getApplication();    //===================================================    /*耦合(依懒性)方式*/    HttpServletRequest request2 = ServletActionContext.getRequest();    HttpServletResponse response = ServletActionContext.getResponse();    HttpSession session2 = request2.getSession();        //request2.setAttribute("username", username);        /**     * struts默认提供了五个状态字符串     */    return userbiz.login(username, password);  }      /**   * @return the username   */  public String getUsername() {    return username;  }  /**   * @param username the username to set   */  public void setUsername(String username) {    this.username = username;  }  /**   * @return the password   */  public String getPassword() {    return password;  }  /**   * @param password the password to set   */  public void setPassword(String password) {    this.password = password;  }}

第六步:配置struts.

<?DOCTYPE struts PUBLIC  "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"  "http://struts.apache.org/dtds/struts-2.3.dtd">  <struts>    <!-- 配置包信息 -->    <package name="default" namespace="/" extends="struts-default">      <!-- 配置Action:关联Action JavaBean -->      <action name="LonginAction" class="Action.LoginAction">        <!-- 指定返回的视图 ;默认使用转发-->        <result name="success">success.jsp</result>        <result name="error">error.jsp</result>      </action>    </package>  </struts>

第七步:处理完逻辑之后返回相应的字符串success、error跳转到相应的页面

<%@ 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 'success.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>  ${username } 登陆成功!!! <br> </body></html>

<%@ 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 'error.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>  登录失败 <br> </body></html>

注意:

配置struts2  1、加入类库(jar包)—从应用实例当中拷贝  2、在web.<!-- 配置Struts2过滤器 -->     <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><!--'/*' 过滤所有请求 -->     </filter-mapping>    3、编写页面index.jsp  4、配置控制器(action) LoginAction 继承 Actionsupper    重写父类的excute()方法  5、配置struts.