struts2入门Demo示例

本文讲述了struts2入门Demo示例。分享给大家供大家参考。具体如下：

1.新建Web Project, 名称:struts2Demo;

2.建立一个用户库struts2, 包含最少的struts2的最少的6个jar文件;
其实呢, 对于MyEclipse8以上来说, 是不必须的, 因为它直接支持struts2了.不需要另外导包.

3.用Build Path将struts2的库加进来;

4.在web.xml中加入以下配置:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" >
  <!-- struts2的配置 -->
  <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>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

5.建立Action

package com.yenange.action;
import com.opensymphony.xwork2.Action;
public class LoginAction implements Action {
  private String uname;  //表单中的姓名
  private String upass;  //表单中的密码
  //执行方法
  @Override
  public String execute() throws Exception {
    System.out.println("姓名:"+uname);
    System.out.println("密码:"+upass);
    if (uname.equals("leaf") && upass.equals("leaf")) {
      return "success";
    }
    return "error";
  }
  //记住, 要有get和set方法
  public String getUpass() {
    return upass;
  }
  public void setUpass(String upass) {
    this.upass = upass;
  }
  public String getUname() {
    return uname;
  }
  public void setUname(String uname) {
    this.uname = uname;
  }
}

6.三个页面文件:

index.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<html>
  <head>
    <title>My JSP 'index.jsp' starting page</title>
  </head>
  <body>
    <form action="login">
      用户名:<input type="text" name="uname"><br>
      密 码:<input type="text" name="upass"><br>
      <input type="submit" value="登陆" />
    </form>
  </body>
</html>

welcome.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<html>
  <head>
    <title>My JSP 'welcome.jsp' starting page</title>
  </head>
  <body>
    welcome struts2
  </body>
</html>

fail.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<html>
 <head>
  <title>My JSP 'welcome.jsp' starting page</title>
 </head>
 <body>
出错!
</body>
</html>

7.配置struts.xml. (对于MyEclipse6来说, 只能从别的地方copy)

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
  "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
  "http://struts.apache.org/dtds/struts-2.0.dtd" >
<struts>
  <package name="default" namespace="/" extends="struts-default">
    <action name="login" class="com.yenange.action.LoginAction">
      <result name="success">/welcome.jsp</result>
      <result name="error">/fail.jsp</result>
    </action>
  </package>
  <!-- Add packages here -->
</struts>

8.到此完成.可以运行一下了, 是不是很简单?

下面是取得request, session, application这些东西的方法.

package com.yenange.action;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.SessionAware;
import org.apache.struts2.util.ServletContextAware;
import com.opensymphony.xwork2.Action;
public class LoginAction implements Action,ServletRequestAware,SessionAware,ServletContextAware {
  private String uname;  //表单中的姓名
  private String upass;  //表单中的密码
  HttpServletRequest request;  //常用的request
  Map session;  //常用的session,有不同, 但是不需要管
  ServletContext application;    //常用的application
  //第二种取的方法;
  HttpServletRequest request2 = ServletActionContext.getRequest();
  HttpServletResponse response2 = ServletActionContext.getResponse();
  HttpSession session2 = request2.getSession();
  @Override
  public void setServletRequest(HttpServletRequest req) {
    this.request=req;
  }
  @Override
  public void setSession(Map session) {
    this.session=session;
  }
  @Override
  public void setServletContext(ServletContext application) {
    this.application=application;
  }
  //执行方法
  public String execute() throws Exception {
    if (uname.equals("leaf") && upass.equals("leaf")) {
      request.setAttribute("userName", uname);
      return "success";
    }
    request.setAttribute("accessError", uname+"这个用户或密码不正确!");
    return "error";
  }
  //记住, 要有get和set方法
  public String getUpass() {
    return upass;
  }
  public void setUpass(String upass) {
    this.upass = upass;
  }
  public String getUname() {
    return uname;
  }
  public void setUname(String uname) {
    this.uname = uname;
  }
}

这些只是初步了, 后面再学习一些关于标签, 动态方法之类的东西.

希望本文所述对大家的Struts程序设计有所帮助。