struts2的文件下载是基于stream结果视图来进行的
struts代码
<action name="downloadAction_*" class="downloadAction" method="{1}">
<result name="success" type="stream">
<!-- 设置输入流的来源 -->
<param name="inputName">inputStream</param>
<!-- 设置头 -->
<param name="contentDisposition">attachment;filename=${name}</param>
<!-- 设置头,不让浏览器直接打开,二进制流 -->
<param name="contentType">application/octet-stream</param>
<param name="contentLength">${filelength}</param>
</result>
</action>
action代码
private InputStream inputStream;
private String name;
private int filelength;
public String upload() throws IOException {
ServletContext sc = ServletActionContext.getServletContext();
String realPath = sc.getRealPath("/WEB-INF/upload/day04-js高级.txt");
inputStream = new FileInputStream(realPath);
filelength = inputStream.available();
//设置文件名
name = FilenameUtils.getName(realPath);//要进行URL编码,火狐浏览器除外
//调用网上查找的FileUtils类防止乱码
name = FileUtils.encodeDownloadFilename(name,ServletActionContext.getRequest().getHeader("user-agent"));
return SUCCESS;
}
public InputStream getInputStream() {
return inputStream;
}
public String getName() {
return name;
}
public int getFilelength() {
return filelength;
}
//一个很好用的fileutils
private InputStream inputStream;
private String name;
private int filelength;
public String upload() throws IOException {
ServletContext sc = ServletActionContext.getServletContext();
String realPath = sc.getRealPath("/WEB-INF/upload/day04-js高级.txt");
inputStream = new FileInputStream(realPath);
filelength = inputStream.available();
//设置文件名
name = FilenameUtils.getName(realPath);//要进行URL编码,火狐浏览器除外
//调用网上查找的FileUtils类防止乱码
name = FileUtils.encodeDownloadFilename(name,ServletActionContext.getRequest().getHeader("user-agent"));
return SUCCESS;
}
public InputStream getInputStream() {
return inputStream;
}
public String getName() {
return name;
}
public int getFilelength() {
return filelength;
}
//一个很好用的fileutils
package it.he.service;
import java.io.IOException;
import java.net.URLEncoder;
import sun.misc.BASE64Encoder;
public class FileUtils {
/**
* 下载文件时,针对不同浏览器,进行附件名的编码
*
* @param filename
* 下载文件名
* @param agent
* 客户端浏览器f
* @return 编码后的下载附件名
* @throws IOException
*/
public static String encodeDownloadFilename(String filename, String agent)
throws IOException {
if (agent.contains("Firefox")) { // 火狐浏览器
filename = "=?UTF-8?B?"
+ new BASE64Encoder().encode(filename.getBytes("utf-8"))
+ "?=";
filename = filename.replaceAll("\r\n", "");
} else { // IE及其他浏览器
filename = URLEncoder.encode(filename, "utf-8");
filename = filename.replace("+"," ");
}
return filename;
}
}