struts2 直接访问sevlet API 的问题，求助！

猿带码 2016-01-19 03:09:20

小弟初学javaweb，用的《轻松学java web开发》，按照书上案例做的，但是从jsp传递到action中的参数是空值。
无论用IOC方式还是非IOC方式输出都是空值

Struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
<constant name="struts.i18n.encoding" value="gb2312" />
<package name="default" extends="struts-default">
<action name="noiocAction" class="action.NoIoCAction">
<result name="success">/addSuccess.jsp</result>
</action>

</package>
</struts>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
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_3_0.xsd">
<display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<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>
</web-app>

NoIoCAction.action



package action;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;





public class NoIoCAction extends ActionSupport {

	private static final long serialVersionUID = 1L;

	private String bookName="123";

	private double bookPrice;

	private String bookPress;



	//省略属性的setXXX()和getXXX()方法



	public String execute() {

		HttpServletRequest request = ServletActionContext.getRequest();

		//request.getParameter("bookname");

	

		HttpSession session = request.getSession();

		session.setAttribute("bookName",this.bookName);

		session.setAttribute("bookPrice",this.bookPrice);

		session.setAttribute("bookPress",this.bookPress);

		return SUCCESS;

	}

}



<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

<%@ taglib prefix="s" uri="/struts-tags"%>

<html>

  <head>

    <title>添加图书</title>

  </head>

  <body>

   <center>

	<s:form action="noiocAction" method="post">

		<s:textfield name="bookName" label="书名"/>

		<s:textfield name="bookPrice" label="价格"/>

		<s:textfield name="bookPress" label="出版社"/>

		<s:submit value="提交"/>

	</s:form>

   </center>

  </body>

</html>



<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

<%@ taglib prefix="s" uri="/struts-tags"%>



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>添加成功</title>

  </head>

  <body>

   

   读取session中的内容，您添加的图书信息为：

   <br><br>

   书名：<s:property value="#session.bookName"/> <br><br>

  价格：<s:property value="#session.bookPrice"/> <br><br>

   出版社：<s:property value="#session.bookPress"/>

  </body>

</html>