JavaWeb -- Struts1 多文件上传与下载 DownloadAction， DispatchAction

1. 多文件上传与下载

上传下载jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

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

<html>

  <head>

    <title>My JSP 'index.jsp' starting page</title>

  </head>

  <body>

  	<a href="${pageContext.request.contextPath }/downFile.do">下载</a>

    <form action="${pageContext.request.contextPath }/UpFile.do" method="post" enctype="multipart/form-data">

    	上传用户：<input type="text" name="username"><br/>

    	上传文件1:<input type="file" name="list[0]"><br/>

    	上传文件2:<input type="file" name="list[1]"><br/>

    	<input type="submit" value="上传">

    </form>

  </body>

</html>

actionform bean:

public class UpFileFormBean extends ActionForm {

	private String username;

	private List<FormFile> list = new ArrayList();;

	public String getUsername() {

		return username;

	}

	public void setUsername(String username) {

		this.username = username;

	}

	public FormFile getList(int index) {

		return list.get(index);

	}

	public void setList(int index,FormFile file) {

		list.add(file);

	}

	public List<FormFile> getAll(){

		return list;

	}

}

上传action:

//加过滤器解决乱码

public class UpFileAction extends Action {

	@Override

	public ActionForward execute(ActionMapping mapping, ActionForm form,

			HttpServletRequest request, HttpServletResponse response)

			throws Exception {

		UpFileFormBean formbean = (UpFileFormBean) form;

		/*  //单文件上传

		System.out.println("上传用户：" + formbean.getUsername());

		FormFile file = formbean.getUpfile();

		String filename = file.getFileName();

		InputStream in = file.getInputStream();

		FileOutputStream out = new FileOutputStream("c:\\" + filename);

		int len = 0;

		byte buffer[] = new byte[1024];

		while((len=in.read(buffer))>0){

			out.write(buffer, 0, len);

		}

		in.close();

		out.close();*/

		//多文件上传

		List<FormFile> all = formbean.getAll();

		System.out.println(all.size());

		for(FormFile formFile : all){

			String filename = formFile.getFileName();

			InputStream in = formFile.getInputStream();

			FileOutputStream out = new FileOutputStream("c:\\" + filename);

			int len = 0;

			byte buffer[] = new byte[1024];

			while((len=in.read(buffer))>0){

				out.write(buffer, 0, len);

			}

			in.close();

			out.close();

		}

		return super.execute(mapping, form, request, response);

	}

}

下载action:

public class DownFileAction extends DownloadAction {

	@Override

	protected StreamInfo getStreamInfo(ActionMapping arg0, ActionForm arg1,

			HttpServletRequest request, HttpServletResponse response) throws Exception {

		response.setHeader("content-disposition", "attachment;filename=1.jpg");

		String downfile = request.getSession().getServletContext().getRealPath("/download/1.jpg");  //servlet

		return new DownloadAction.FileStreamInfo("image/jpg", new File(downfile));

	}

}

struts-config.xml 配置文件

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

<!DOCTYPE struts-config PUBLIC

          "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"

          "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>

	<form-beans>

		<form-bean name="UpFileFormBean" type="cn.itcast.web.formbean.UpFileFormBean"></form-bean>

	</form-beans>

	<action-mappings>

		 <action path="/downFile" type="cn.itcast.web.action.DownFileAction"></action>

		<action path="/UpFile"

				type="cn.itcast.web.action.UpFileAction"

				name="UpFileFormBean"

				scope="request"

				>

		</action>

	</action-mappings>

	<!--最大上传文件-->

	<controller processorClass="org.apache.struts.action.RequestProcessor" maxFileSize="1K"></controller>

</struts-config>

web.xml 配置文件

<?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">

  <servlet>

  	<servlet-name>ActionServlet</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>

    <load-on-startup>2</load-on-startup>

  </servlet>

  <servlet-mapping>

  	<servlet-name>ActionServlet</servlet-name>

  	<url-pattern>*.do</url-pattern>

  </servlet-mapping>

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

</web-app>

2. 如何实现一个action处理多个请求, 两种实现 DispatchAction 和 MappingDispatchAction

多请求jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

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

<html>

  <head>

    <title>My JSP '1.jsp' starting page</title>

  </head>

  <body>

    <html:link action="/BookAction?method=add">添加图书</html:link>

     <html:link action="/BookAction?method=delete">删除图书</html:link>

      <html:link action="/BookAction?method=update">修改图书</html:link>

       <html:link action="/BookAction?method=find">查找图书</html:link>

   <br/> <br/>---------------------------------------------<br/><br/>

    <html:link action="/addbook">添加图书</html:link>

     <html:link action="/deletebook">删除图书</html:link>

      <html:link action="/updatebook">修改图书</html:link>

       <html:link action="/findbook">查找图书</html:link>

  </body>

</html>

action 处理，两种实现DispatchAction 和 MappingDispatchAction，配置文件不同

//DispatchAction---action  ---execute()  add 

/*

   String method = mapping.getParamter();

   String methodName = request.getParameter(method);  //add update

 */

public class BookAction extends DispatchAction {

	public ActionForward add(ActionMapping arg0, ActionForm arg1,

			HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {

		System.out.println("add....");

		return null;

	}

	public ActionForward update(ActionMapping arg0, ActionForm arg1,

			HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {

		System.out.println("udpate....");

		return null;

	}

	public ActionForward delete(ActionMapping arg0, ActionForm arg1,

			HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {

		System.out.println("delete....");

		return null;

	}

	public ActionForward find(ActionMapping arg0, ActionForm arg1,

			HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {

		System.out.println("find....");

		return null;

	}

}

public class BookAction2 extends MappingDispatchAction {

	public ActionForward add(ActionMapping arg0, ActionForm arg1,

			HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {

		System.out.println("add....");

		return null;

	}

	public ActionForward update(ActionMapping arg0, ActionForm arg1,

			HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {

		// TODO Auto-generated method stub

		System.out.println("udpate....");

		return null;

	}

	public ActionForward delete(ActionMapping arg0, ActionForm arg1,

			HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {

		// TODO Auto-generated method stub

		System.out.println("delete....");

		return null;

	}

	public ActionForward find(ActionMapping arg0, ActionForm arg1,

			HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {

		// TODO Auto-generated method stub

		System.out.println("find....");

		return null;

	}

web.xml 配置文件

<?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">

  <!--struts配置文件可以添加多个配置文件struts-config2.xml-->

  <servlet>

  	<servlet-name>ActionServlet</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,/WEB-INF/struts-config2.xml</param-value>

    </init-param>

    <load-on-startup>2</load-on-startup>

  </servlet>

  <servlet-mapping>

  	<servlet-name>ActionServlet</servlet-name>

  	<url-pattern>*.do</url-pattern>

  </servlet-mapping>

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

</web-app>

struts-config.xml 配置文件1

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

<!DOCTYPE struts-config PUBLIC

          "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"

          "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>

	<action-mappings>

		<action path="/BookAction"

				type="cn.itcast.web.action.BookAction"

				parameter="method"> <!-- 告诉struts，要调用的方法名称是通过什么参数带过来的 -->

		</action>

	</action-mappings>

</struts-config>

struts-config2.xml

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

<!DOCTYPE struts-config PUBLIC

          "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"

          "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>

	<action-mappings>

		<action path="/addbook" type="cn.itcast.web.action.BookAction2" parameter="add"/>

		<action path="/updatebook" type="cn.itcast.web.action.BookAction2" parameter="update"/>

		<action path="/findbook" type="cn.itcast.web.action.BookAction2" parameter="find"/>

		<action path="/deletebook" type="cn.itcast.web.action.BookAction2" parameter="delete"/>

	</action-mappings>

</struts-config>

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