原文地址:http://blog.csdn.net/hzc543806053/article/details/7538723
文件上傳鏈接: 1)Servlet 文件上傳 ———— 點(diǎn)擊打開鏈接
2)Struts2 文件上傳 ———— 點(diǎn)擊打開鏈接
文件下載是一個(gè)很常見的功能,,用struts2實(shí)現(xiàn)文件下載的步驟:
一)定義一個(gè)Action類,F(xiàn)ileDownload.java
- package com.struts2.filedownload;
-
- import java.io.InputStream;
-
-
- import org.apache.struts2.ServletActionContext;
-
-
- import com.opensymphony.xwork2.ActionSupport;
-
-
- public class FileDownload extends ActionSupport{
-
- private int number ;
-
- private String fileName;
-
- public int getNumber() {
- return number;
- }
-
- public void setNumber(int number) {
- this.number = number;
- }
-
- public String getFileName() {
- return fileName;
- }
-
- public void setFileName(String fileName) {
- this.fileName = fileName;
- }
-
-
- public InputStream getDownloadFile() throws Exception
- {
- if(1 == number)
- {
- this.fileName = "Dream.jpg" ;
-
- return ServletActionContext.getServletContext().getResourceAsStream("upload/Dream.jpg") ;
- }
-
- else if(2 == number)
- {
- this.fileName = "jd2chm源碼生成chm格式文檔.rar" ;
-
- this.fileName = new String(this.fileName.getBytes("GBK"),"ISO-8859-1");
- return ServletActionContext.getServletContext().getResourceAsStream("upload/jd2chm源碼生成chm格式文檔.rar") ;
- }
- else
- return null ;
- }
-
- @Override
- public String execute() throws Exception {
-
- return SUCCESS;
- }
-
- }
二)在struts.xml文件中配置相關(guān)信息
- <struts>
- <package name="struts2" extends="struts-default">
- <action name="FileDownload" class="com.struts2.filedownload.FileDownload">
- <result name="success" type="stream">
- <param name="contentType">text/plain</param>
- <param name="contentDisposition">attachment;fileName="${fileName}"</param>
- <param name="inputName">downloadFile</param>
- <param name="bufferSize">1024</param>
- </result>
- </action>
-
- </package>
-
- </struts>
1.結(jié)果類型必須要寫成 type="stream" ,與之對(duì)應(yīng)的處理類是 org.apache.struts2.dispatcher.StreamResult
2.涉及到的參數(shù):
3.
1) <param name="contentDisposition">attachment;fileName="${fileName}"</param> contentDisposition默認(rèn)是 inline(內(nèi)聯(lián)的), 比如說下載的文件是文本類型的,,就直接在網(wǎng)頁(yè)上打開,,不能直接打開的才會(huì)打開下載框自己選擇 2) attachment :下載時(shí)會(huì)打開下載框 3) fileName="${fileName}" :在這定義的名字是一個(gè)動(dòng)態(tài)的,,該名字是顯示在下載框上的文件名字
4.<param name="inputName">downloadFile</param>,,這個(gè)downloadFile名字要和FileDownload.java類中的getDownloadFile()方法名去掉get 一致
三)用于顯示下載的鏈接界面 filedownload.jsp
- <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
- <%
- String path = request.getContextPath();
- String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
- %>
-
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
- <html>
- <head>
- <base href="<%=basePath%>">
-
- <title>My JSP 'filedownload.jsp' starting page</title>
-
- <meta http-equiv="pragma" content="no-cache">
- <meta http-equiv="cache-control" content="no-cache">
- <meta http-equiv="expires" content="0">
- <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
- <meta http-equiv="description" content="This is my page">
-
-
-
-
- </head>
-
- <body>
-
- <h2>文件下載內(nèi)容:</h2><br/>
- Dream.jpg:<a href="FileDownload.action?number=1">點(diǎn)擊下載</a><br/>
- jd2chm源碼生成chm格式文檔.rar:<a href="FileDownload.action?number=2">點(diǎn)擊下載2</a>
-
-
- </body>
- </html>
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