struts如何实现下载？

struts 1 如何实现下载，主要是那个页面上显示一些标题，然后我要传递什么参数给action才能实现下载？

例子文章
http://xuehongliang.iteye.com/blog/53901

Struts+Spring+Hibernate实现上传下载
http://java.itpub.net/post/20968/383857

把如下代码加入Action代码中，传递2个参数，一个为文件地址，一个为文件明，response就会将文件流输出。要点在于FileInputStream 和OutputStream 的操作上。
[code="java"]

       String path = request.getParameter("path");// 物理文件地址
    String file = request.getParameter("file");// 文件名
    path = request.getRealPath(path);
    String fileName = path + File.separatorChar + file;

    String tmpFileName = file.toLowerCase();
    String fileExt = "";
    String CONTENT_TYPE = "application/octet-stream;charset=GBK";
    boolean headFlag = true;
    if (fileName.endsWith(".doc")) {
        fileExt = "doc";
        CONTENT_TYPE = "application/msword;charset=GBK";
        // headFlag = false;
    } else if (tmpFileName.endsWith(".ppt")) {
        fileExt = "ppt";
    } else if (tmpFileName.endsWith(".xls")) {
        fileExt = "xls";
    } else if (tmpFileName.endsWith(".mdb")) {
        fileExt = "mdb";
    } else if (tmpFileName.endsWith(".zip")) {
        fileExt = "zip";
    } else if (tmpFileName.endsWith(".mp3")) {
        fileExt = "mp3";
    } else if (tmpFileName.endsWith(".avi")) {
        fileExt = "avi";
    } else if (tmpFileName.endsWith(".rm")) {
        fileExt = "rm";
    } else if (tmpFileName.endsWith(".gz")) {
        fileExt = "gz";
    } else if (tmpFileName.endsWith(".htm")) {
        fileExt = "htm";
        headFlag = false;
        CONTENT_TYPE = "text/html; charset=GBK";
    } else if (tmpFileName.endsWith(".html")) {
        fileExt = "html";
        headFlag = false;
        CONTENT_TYPE = "text/html; charset=GBK";
    } else if (tmpFileName.endsWith(".txt")) {
        fileExt = "txt";
        headFlag = false;
        CONTENT_TYPE = "text/html; charset=GBK";
    } else if (tmpFileName.endsWith(".rar")) {
        fileExt = "rar";
    } else if (tmpFileName.endsWith(".jpg")) {
        fileExt = "jpg";
    } else if (tmpFileName.endsWith(".gif")) {
        fileExt = "gif";
    } else if (tmpFileName.endsWith(".iso")) {
        fileExt = "iso";
    } else {
        fileExt = tmpFileName.substring(tmpFileName.lastIndexOf("."),
                tmpFileName.length());
    }

    String header_file = tmpFileName;
    try {
        header_file = new String(header_file.getBytes("GBK"), "ISO-8859-1");
    } catch (Exception ex) {
        header_file = tmpFileName;
    }
    response.setContentType(CONTENT_TYPE);
    if (headFlag) {
        response.setHeader("Content-Disposition", "attachment;filename="
                + header_file);
    }

    try {
        // 导出数据
        FileInputStream fis = new FileInputStream(fileName);
        OutputStream os = response.getOutputStream();
        byte[] buffer = new byte[1024];
        int n = 0;
        while ((n = fis.read(buffer)) > 0) {
            os.write(buffer, 0, n);
        }
        fis.close();
        os.flush();
        os.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

    catch (IOException e) {
        e.printStackTrace();
    }

[/code]

看你要下载什么了

正常来说流操作直接写入就足够了

偷懒的办法把要下载的文件路径传到页面，用FTP的方式也未尝不可，嘿嘿，办法都是人想出来的，只要满足客户需求， 怎么做都行。