Struts2文件下载实现-优快云博客

DownloadAction:

package crm.action;

import java.io.File;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class DownloadAction extends ActionSupport {
    private String paramName;
    private File download;
    private String downloadFileName;
    private String downloadContentType;

public String getParamName() {
return paramName;
}

public void setParamName(String paramName) {
this.paramName = paramName;
}

public File getDownload() {
return download;
}

public void setDownload(File download) {
this.download = download;
}

public String getDownloadFileName() {
return downloadFileName;
}

public void setDownloadFileName(String downloadFileName) {
this.downloadFileName = downloadFileName;
}

public String getDownloadContentType() {
return downloadContentType;
}

public void setDownloadContentType(String downloadContentType) {
this.downloadContentType = downloadContentType;
}

// 从下载文件原始存放路径读取得到文件输出流
  public InputStream getDownloadFile() throws UnsupportedEncodingException {
    paramName = new String(paramName
                .getBytes("ISO8859-1"), "utf-8");
        downloadFileName = paramName;

//相对路径
return ServletActionContext.getServletContext().getResourceAsStream("/upload/"+downloadFileName);

//绝对路径

        //return new FileInputStream("E:/贾秋峰备份/软件库/"+downloadFileName);
    }

    // 如果下载文件名为中文，进行字符编码转换
    public String getDownloadChineseFileName() {
        String downloadChineseFileName = "";
        try {
            downloadChineseFileName = new String(downloadFileName
                    .getBytes("GBK"), "ISO8859-1");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return downloadChineseFileName;
    }
}

struts.xml:

<action name="downloadFile" class="downloadAction">
   <param name="paramName">123.jpg</param>
   <result type="stream">
       
    <param name="contentType">application/octet-stream</param>
    
    <param name="inputName">downloadFile</param>
    
    <param name="contentDisposition">attachment;filename="${downloadChineseFileName}"</param>
    
    <param name="bufferSize">70960</param>
   </result>
  </action>

applicationContext.xml:

download.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
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>
    <title>上传文件</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 style="text-align: center;">
   <a href="downloadFile.action">123.jpg</a>
</body>
</html>