Struts2檔案下載-絕對路徑/相對路徑
阿新 • • 發佈：2018-12-31
專案程式碼+jar包下載匯入即可使用
檔案下載是一個很常見的功能，用struts2實現檔案下載的步驟：
package download; import java.io.FileInputStream; import java.io.InputStream; import com.opensymphony.xwork2.ActionSupport; //檔案下載 public class FileDownload extends ActionSupport { private int number; private String fileName; private String urlname; 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; } // 返回一個輸入流，作為一個客戶端來說是一個輸入流，但對於伺服器端是一個 輸出流 public InputStream getDownloadFile() throws Exception { if (1 == number) { this.fileName = "Dream.jpg"; //File f = new File("C:/Users/Administrator/Pictures/222.jpg"); return new FileInputStream(urlname); // 獲取資源路徑 //return ServletActionContext.getServletContext().getResourceAsStream(""); } else if (2 == number) { this.fileName = "jd2chm原始碼生成chm格式文件.rar"; // 解解亂碼 this.fileName = new String(this.fileName.getBytes("GBK"), "ISO-8859-1"); //return ServletActionContext.getServletContext().getResourceAsStream("upload/jd2chm原始碼生成chm格式文件.rar"); return new FileInputStream(urlname); } else return null; } @Override public String execute() throws Exception { return SUCCESS; } public String getUrlname() { return urlname; } public void setUrlname(String urlname) { this.urlname = urlname; } }
二)在struts.xml檔案中配置相關資訊
1.結果型別必須要寫成 type="stream" ,與之對應的處理類是 org.apache.struts2.dispatcher.StreamResult<?xml version="1.0" encoding="UTF-8" ?> <!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.i18n.encoding" value="utf8" /> <constant name="struts.multipart.maxSize" value="16777216"></constant> <package name="struts2" extends="struts-default"> <action name="FileDownload" class="download.FileDownload"> <result name="success" type="stream"> <param name="contentType">text/plain</param> <param name="contentDisposition">attachment;fileName="${fileName}"</param> <param name="inputName">downloadFile</param> <param name="bufferSize">1024</param> </result> </action> </package> </struts>
2.涉及到的引數：
3.
1) <param name="contentDisposition">attachment;fileName="${fileName}"</param>
contentDisposition預設是 inline（內聯的), 比如說下載的檔案是文字型別的，就直接在網頁上開啟，不能直接開啟的才會開啟下載框自己選擇
2) attachment ：下載時會開啟下載框
3) fileName="${fileName}" ：在這定義的名字是一個動態的，該名字是顯示在下載框上的檔名字
4.<param name="inputName">downloadFile</param>，這個downloadFile名字要和FileDownload.java類中的getDownloadFile()方法名去掉get 一致
三）用於顯示下載的連結介面 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>檔案下載</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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<h2>檔案下載內容：</h2><br/>
Dream.jpg:<a href="FileDownload.action?number=1&urlname=c:/testindex.txt">點選下載</a><br/>
jd2chm原始碼生成chm格式文件.rar:<a href="FileDownload.action?number=2&urlname=c:/testindex.txt">點選下載2</a>
確保c盤根目錄存在testindex.txt這個檔案
</body>
</html> 轉載地址:http://blog.csdn.net/hzc543806053/article/details/7538723