struts2基础学习一

1、步骤：

① Create a class to store the welcome message (the model)

MessageStore.java

<div style="text-align: left;"><pre name="code" class="java">package org.apache.struts.helloworld.model;

public class MessageStore {

    private String message;

    public MessageStore() {

        setMessage("Hello Struts User");
    }

    public String getMessage() {

        return message;
    }

    public void setMessage(String message) {

        this.message = message;
    }

}

② Create a server page to present the message (the view)

HelloWorldAction.java

<span style="font-family: Verdana, arial, sans-serif;font-size:18px; line-height: 16px; text-align: center; ">package org.apache.struts.helloworld.action;</span>
import org.apache.struts.helloworld.model.MessageStore;
import com.opensymphony.xwork2.ActionSupport;

public class HelloWorldAction extends ActionSupport {

    private static final long serialVersionUID = 1L;

    private MessageStore messageStore;

    public String execute() throws Exception {

        messageStore = new MessageStore() ;
        return SUCCESS;
    }

    public MessageStore getMessageStore() {
        return messageStore;
    }

    public void setMessageStore(MessageStore messageStore) {
        this.messageStore = messageStore;
    }

}

③ Create an Action class to control the interaction between the user, the model, and the view (the controller)

HelloWorld.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>

<%@ taglib prefix="s" uri="/struts-tags" %>
<!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>Hello World!</title>
  </head>

  <body>
    <h2><s:property value="messageStore.message" /></h2>   
  </body>
</html>

注： <s:property value="messageStore.message" />是用过MessageStore对象的getMessage()方法获取message属性值的。

④ Create a mapping (struts.xml) to couple the Action class and view

struts.xml

<span style="font-family: Verdana, arial, sans-serif;font-size:18px; line-height: 16px; text-align: center; "><?xml version="1.0" encoding="UTF-8"?></span>

<!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts>   <constant name="struts.devMode" value="true" />   <package name="basicstruts2" extends="struts-default">    <action name="index">          <result>/index.jsp</result>    </action>             <action name="hello" class="org.apache.struts.helloworld.action.HelloWorldAction" method="execute">      <result name="success">/HelloWorld.jsp</result>    </action>  </package></struts>

注：

①不写class默认是ActionSupport类，在<result>中不写name则name默认值为success

index.jsp

② <constant name="struts.devMode" value="true" /> struts.devMode常量代表是否是开发模式，如果是开发模式则使用热部署，structs2默认不使用开发模式

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

    pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!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>Basic Struts 2 Application - Welcome</title>
</head>
<body>
<h1>Welcome To Struts 2!</h1>
<p><a href="<s:url action='hello'/>">Hello World</a></p>
</body>
</html>

2、包的命令空间（structs.xml）具有容错规则，但是不要使用（容错规则就是从子层一点点往上找，最后找/,如果都找不到就报错）

<package name="basicstruts2" namespace="/aa/bb" extends="struts-default">
<action name="hello" class="com.action.HelloWorldAction" method="execute">
<result name="success">/helloworld.jsp</result>
</action>
</package>

命名空间namespace="/aa/bb"，所以在访问是路径将是/aa/bb/helloworld.action

在jsp中<p><a href="<s:url namespace="/aa/bb" action='hello'/>">Hello World</a></p>加入namespace="/aa/bb"也是可以的

3、配置后缀名：

<constant name="struts.action.extension" value="action,,do" />

后缀名为.action,空，.do的。虽然很多配置都在structs,core中的default.properties文件中，但是尽量不去修改，以免引入错误，如果需要修改，就需要重新打成jar包，再引入进来。

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struts2基础学习一

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