Struts2学习(一)

struts2框架主要是封装了servlet,简化了jsp跳转的复杂操作,并且提供了易于编写的标签,可以快速开发view层的代码。

  过去,我们用jsp和servlet搭配,实现展现时,大体的过程是:

  1 jsp触发action

  2 servlet接受action,交给后台class处理

  3 后台class跳转到其他的jsp,实现数据展现

  现在有了struts2,实现过程变为

  1 jsp出发action

  2 struts2拦截请求,调用后台action

  3 action返回结果,由不同的jsp展现数据

需要的包如下:

1 commons-fileupload-1.3.2.jar  
2 javassist-3.11.0.GA.jar
3 commons-io-2.2.jar            
4 ognl-3.0.19.jar
5 commons-lang3-3.2.jar         
6 struts2-core-2.3.32.jar
7 commons-logging-1.1.3.jar    
8 xwork-core-2.3.32.jar
9 freemarker-2.3.22.jar

登陆页面代码:login.jsp

<%@page language="java" contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title><s:text name="loginPage"/></title>
    </head>
    <body>
        <s:form action="login">
            <!--s:textfield name="username" key="user"/-->
            <p>
                输入用户名:<input type="text" name="username" key="user"/>
            </p>
            
            <!--s:textfield name="password" key="pass"/-->
            <p>
                输入密码:<input type="password" name="password" key="pass"/>
            </p>
            
            <s:submit key="login"/>
        </s:form>
    </body>
</html>

 登陆成功页面:welcome.jsp

<%@page language="java" contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title><s:text name="succPage"/></title>
    </head>
    <body>
        <s:text name="succTip">
        <s:param>${sessionScope.user}</s:param>
    </s:text><br/>
    </body>
</html>

登陆失败页面:error.jsp

<%@page language="java" contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title><s:text name="errorPage"/></title>
    </head>
    <body>
        <s:text name="failTip"/>
    </body>
</html>
处理action的java代码:LoginAction.java
package edu.jju;

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

/**
 *
 * @author munication
 */
public class LoginAction extends ActionSupport {
    private String username;
    private 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;
    }

    /**
     *
     * @return
     * @throws Exception
     */
    @Override
    public String execute() throws Exception {
        if (getUsername().equals("admin") && getPassword().equals("xxl123")) {
            ActionContext.getContext().getSession().put("user", getUsername());
            return SUCCESS;
        }else{
            return ERROR;
        }
    }
}

部署文件web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <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>

struts2的配置文件:struts.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
    "http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts>
    <!-- 指定全局国际化资源文件 -->
    <!--constant name="struts.custom.i18n.resources" value="mess"/-->
    <!-- 指定国际化编码所使用的字符集 -->    
    <!--constant name="struts.i18n.encoding" value="utf-8"/-->
    <!-- 所有的Action定义都应该放在package下 -->
    <package name="test" extends="struts-default">
        <action name="login" class="edu.jju.LoginAction">
            <result name="error">/error.jsp</result>
            <result name="success">/welcome.jsp</result>
        </action>
    </package>
</struts>

至此第一个demo完成了。

 

posted @ 2017-05-09 07:24  叕叒双又  阅读(171)  评论(0编辑  收藏  举报