java下載文件出現(xiàn)亂碼怎么解決

這期內(nèi)容當(dāng)中的小編將會(huì)給大家?guī)?lái)有關(guān)java下載文件出現(xiàn)亂碼的解決方法，以專業(yè)的角度為大家分析和敘述，閱讀完這篇文章希望大家可以有所收獲。

String fileName = "下載的文件名"; String userAgent = request.getHeader("User-Agent"); 
//針對(duì)IE或者以IE為內(nèi)核的瀏覽器：
if (userAgent.contains("MSIE")||userAgent.contains("Trident")) {
fileName = java.net.URLEncoder.encode(fileName, "UTF-8");
} else { 
//非IE瀏覽器的處理：
fileName = new String(fileName.getBytes("UTF-8"),"ISO-8859-1");
}
response.setHeader("Content-disposition", String.format("attachment; filename=\"%s\"", fileName));
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setCharacterEncoding("UTF-8");

Java文件下載的幾種方式

 public HttpServletResponse download(String path, HttpServletResponse response) {
        try {
            // path是指欲下載的文件的路徑。
            File file = new File(path);
            // 取得文件名。
            String filename = file.getName();
            // 取得文件的后綴名。
            String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();

            // 以流的形式下載文件。
            InputStream fis = new BufferedInputStream(new FileInputStream(path));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            // 清空response
            response.reset();
            // 設(shè)置response的Header
            response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
            response.addHeader("Content-Length", "" + file.length());
            OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
            response.setContentType("application/octet-stream");
            toClient.write(buffer);
            toClient.flush();
            toClient.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        return response;
    }

    public void downloadLocal(HttpServletResponse response) throws FileNotFoundException {
        // 下載本地文件
        String fileName = "Operator.doc".toString(); // 文件的默認(rèn)保存名
        // 讀到流中
        InputStream inStream = new FileInputStream("c:/Operator.doc");// 文件的存放路徑
        // 設(shè)置輸出的格式
        response.reset();
        response.setContentType("bin");
        response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
        // 循環(huán)取出流中的數(shù)據(jù)
        byte[] b = new byte[100];
        int len;
        try {
            while ((len = inStream.read(b)) > 0)
                response.getOutputStream().write(b, 0, len);
            inStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void downloadNet(HttpServletResponse response) throws MalformedURLException {
        // 下載網(wǎng)絡(luò)文件
        int bytesum = 0;
        int byteread = 0;

        URL url = new URL("windine.blogdriver.com/logo.gif");

        try {
            URLConnection conn = url.openConnection();
            InputStream inStream = conn.getInputStream();
            FileOutputStream fs = new FileOutputStream("c:/abc.gif");

            byte[] buffer = new byte[1204];
            int length;
            while ((byteread = inStream.read(buffer)) != -1) {
                bytesum += byteread;
                System.out.println(bytesum);
                fs.write(buffer, 0, byteread);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

支持在線打開文件的一種方式

public void downLoad(String filePath, HttpServletResponse response, boolean isOnLine) throws Exception {
        File f = new File(filePath);
        if (!f.exists()) {
            response.sendError(404, "File not found!");
            return;
        }
        BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));
        byte[] buf = new byte[1024];
        int len = 0;

        response.reset(); // 非常重要
        if (isOnLine) { // 在線打開方式
            URL u = new URL("file:///" + filePath);
            response.setContentType(u.openConnection().getContentType());
            response.setHeader("Content-Disposition", "inline; filename=" + f.getName());
            // 文件名應(yīng)該編碼成UTF-8
        } else { // 純下載方式
            response.setContentType("application/x-msdownload");
            response.setHeader("Content-Disposition", "attachment; filename=" + f.getName());
        }
        OutputStream out = response.getOutputStream();
        while ((len = br.read(buf)) > 0)
            out.write(buf, 0, len);
        br.close();
        out.close();
    }

上述就是小編為大家分享的java下載文件出現(xiàn)亂碼的解決方法了，如果您也有類似的疑惑，不妨礙參照上述分析進(jìn)行理解。如果想了解更多相關(guān)內(nèi)容，請(qǐng)關(guān)注億速云行業(yè)資訊。