初学struts

今天第一次学习strut,跟着jdk学习笔记，做了个简单demo。
发现了些问题
1. eclipse创建web project, 然后在项目点右键，选择myeclipse, enable struts, 系统会自动添加struts.config.xml 和web.xml

2. struts.config.xml
     <action-mappings>
        <action
            path="/hello"
            type="net.tuolian.struts.HelloAction">
            <forward
                name="helloUser"   <!--此处不要写错名称 -->
                path="/WEB-INF/hello.jsp"/>
        </action>
    </action-mappings>

   里面的类名和地址不要写错

3. 编写HelloAction 必须继承struts.action类， 重写exectue方法
   主要的逻辑，就是获取页面的parameter
   逻辑处理，保存获取的参数
   业务分发给相应的jsp页面
比如
  request.setAttribute("userInfo", model);
  return mapping.findForward("helloUser");
  
具体配置文件和代码如何。依次为web.xml, struts.config.xml, HelloAction.java
  

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>3</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
</web-app>

<!DOCTYPE struts-config PUBLIC
 "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
 "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
 <struts-config> 
    <action-mappings> 
        <action 
            path="/hello" 
            type="net.tuolian.struts.HelloAction"> 
            <forward
                name="helloUser"   <!--此处不要写错名称 -->
                path="/WEB-INF/hello.jsp"/> 
        </action> 
    </action-mappings> 
</struts-config>

package net.tuolian.struts;

import java.util.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class HelloAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		// TODO Auto-generated method stub
		String username = request.getParameter("user");
		
		Map model = new HashMap();
		if(username != null){
			model.put("username", username);
		}
		else{
			model.put("username", "nody");
		}
		request.setAttribute("userInfo", model);
		
		
		return mapping.findForward("helloUser");
	}	
	 
}