Struts2文件下載-絕對路徑/相對路徑

2019-11-09 19:27:20

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項目代碼+jar包下載導入即可使用

下載地址:http://download.csdn.net/detail/love_xiolan/9750719

文件下載是一個很常見的功能，用struts2實現文件下載的步驟：

package download;import java.io.FileInputStream;import java.io.InputStream;import com.opensymphony.xwork2.ActionSupport;//文件下載  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，但對于服務器端是一個 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源碼生成chm格式文檔.rar";			// 解解亂碼			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");			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文件中配置相關信息
<?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="${fileName}"</param>				<param name="inputName">downloadFile</param>				<param name="bufferSize">1024</param>			</result>		</action>	</package></struts>
1.結果類型必須要寫成 type="stream"  ,與之對應的處理類是 org.apache.struts2.dispatcher.StreamResult2.涉及到的參數：
3.1)  <param name="contentDisposition">attachment;fileName="${fileName}"</param>     contentDisposition默認是 inline（內聯的), 比如說下載的文件是文本類型的，就直接在網頁上打開，不能直接打開的才會打開下載框自己選擇2)  attachment ：下載時會打開下載框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文件名字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>文件下載</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>文件下載內容：</h2><br/>      Dream.jpg:<a href="FileDownload.action?number=1&urlname=c:/testindex.txt">點擊下載</a><br/>      jd2chm源碼生成chm格式文檔.rar:<a href="FileDownload.action?number=2&urlname=c:/testindex.txt">點擊下載2</a>              確保c盤根目錄存在testindex.txt這個文件  </body>  </html>  轉載地址:http://blog.csdn.net/hzc543806053/article/details/7538723