Struts2文件下载-绝对路径/相对路径

2019-11-10 17:32:23

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项目代码+jar包下载导入即可使用

下载地址:http://download.csdn.net/detail/love_xiolan/9750719

文件下载是一个很常见的功能，用struts2实现文件下载的步骤：

package download;import java.io.FileInputStream;import java.io.InputStream;import com.opensymphony.xwork2.ActionSupport;//文件下载  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;	}	// 返回一个输入流，作为一个客户端来说是一个输入流，但对于服务器端是一个 输出流	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);			// 获取资源路径			//return ServletActionContext.getServletContext().getResourceAsStream("");		}		else if (2 == number) {			this.fileName = "jd2chm源码生成chm格式文档.rar";			// 解解乱码			this.fileName = new String(this.fileName.getBytes("GBK"), "ISO-8859-1");			//return ServletActionContext.getServletContext().getResourceAsStream("upload/jd2chm源码生成chm格式文档.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文件中配置相关信息
<?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="${fileName}"</param>				<param name="inputName">downloadFile</param>				<param name="bufferSize">1024</param>			</result>		</action>	</package></struts>
1.结果类型必须要写成 type="stream"  ,与之对应的处理类是 org.apache.struts2.dispatcher.StreamResult2.涉及到的参数：
3.1)  <param name="contentDisposition">attachment;fileName="${fileName}"</param>     contentDisposition默认是 inline（内联的), 比如说下载的文件是文本类型的，就直接在网页上打开，不能直接打开的才会打开下载框自己选择2)  attachment ：下载时会打开下载框3)  fileName="${fileName}" ：在这定义的名字是一个动态的，该名字是显示在下载框上的文件名字4.<param name="inputName">downloadFile</param>，这个downloadFile名字要和FileDownload.java类中的getDownloadFile()方法名去掉get 一致
三）用于显示下载的链接界面 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>文件下载</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>文件下载内容：</h2><br/>      Dream.jpg:<a href="FileDownload.action?number=1&urlname=c:/testindex.txt">点击下载</a><br/>      jd2chm源码生成chm格式文档.rar:<a href="FileDownload.action?number=2&urlname=c:/testindex.txt">点击下载2</a>              确保c盘根目录存在testindex.txt这个文件  </body>  </html>  转载地址:http://blog.csdn.net/hzc543806053/article/details/7538723