struts2最简单的例子

struts2是由webwork+struts1得来的。很多特性与webwork相似，但与struts1有很大的区别.
我以前没搞过什么webwork（http://baike.baidu.com/view/25660.htm）所以对struts2的机制还很莫生。
运行环境：
servlet contant : apache-tomcat-6.0.20
IDE:   myeclipse7.0 (配套的eclipse为3.4)
JDK:   jdk1.6.0_03
---------------------------
1. 创建web项目 struts2Test
    1.1 在WEB-INF下的lib中拷入struts2的jar包。会在Referenced Libraries中显示。
          lib中不会显示，当程序发布后在tomcat中会显示这会jar包.
    1.2 项目的目录结构。如下图：
struts2最简单的例子

2. 在WebRoot下面建3个jsp文件.
2.1 login.jsp

Code
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
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 'login.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">
    </head>
    <body>
        <s:form name="pageform" action="login" namespace="/" method="post">
            <s:textfield name="username" label="用户名" />
            <s:password name="password" label="密码aa" />
            <s:submit value="登录" />
        </s:form>
    </body>
</html>

     2.2 success.jsp   内容随便去写吧。
     2.3 failed.jsp
3. 修改WEB-INF下面的web.xml文件

Code
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <filter>
      <filter-name>struts2</filter-name>
      <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</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>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>、
这个可以不写
4. 在src下建立action类
在src下建立包com.web 然后建立struts2Action.java类

Code
package com.web;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class struts2Action extends ActionSupport {
    private String username;
    private String password;

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    // @Override
    public String execute() throws Exception {
        if (this.getUsername().equals("wj")
                && this.getPassword().equals("1234")) {
            ActionContext.getContext().getSession().put("user",
                    this.getUsername());
            return "success";
        } else {
            return "error";
        }
    }

    // @Override
    public void validate() {
        if (this.getUsername() == null || this.getUsername().trim().equals("")) {
            addFieldError("username", "用户名错误！");
        }
        if (this.getPassword() == null || this.getPassword().trim().equals("")) {
            addFieldError("password", "password 错误！");
        }
    }
}

5. 在src下建立 struts.xml文件

Code
<?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="login" namespace="/" extends="struts-default">
        <action name="login" class="com.web.struts2Action">
            <result name="error">failed.jsp</result>
            <result name="success">success.jsp</result>
            <result name="input">login.jsp</result>
        </action>
    </package>
</struts>

6. 发布运行
6.1 在如： D:\tomcat\apache-tomcat-6.0.20\conf 的下面有个server.xml 修改成
docBase为项目所在的位置 reloadable为true时不用返复重启tomcat 一般编写代码时写成true 发布后写成false以保存程序运行的稳定性.

6.2 http://localhost:8088/struts2Test/login.jsp 点按钮提交后会变成 http://localhost:8088/struts2Test/login.action

转载于:https://www.cnblogs.com/wj-wangjun/archive/2009/08/14/1545984.html

struts2最简单的例子

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