从云服务器上下载文件，以压缩包方式下载

以下载多个文件为例，需要导入zip4j的jar包，版本不要太高

public void downloadZip(List list, HttpServletRequest request, HttpServletResponse response) {

String zipFileName = "";

File[] tempList = null;

//因为我这边在classpath下无法获取到新建文件夹，所以使用路径拼接

String path = this.getClass().getClassLoader().getResource("template/").getPath();

path += "tempPack";

File outFile = new File(path);

for (fielEntiry file : list) {

String url = file.getUrl();//云服务器文件链接

String fileName = assc.getFileName();

if (!outFile.exists()) {

outFile.mkdirs();

}

try {

download(url, path, fileName);

} catch (Exception e) {

e.printStackTrace();

}

}

zipFileName = "/报告.zip";

tempList = outFile.listFiles();

createZipFile(path, zipFileName, tempList);

for (File file : outFile.listFiles()) {

download(file, request, response);

}

} else {

throw new BadRequestException("暂无报告附件");

}

}

}

*下载文件到临时文件夹

public void download(String urlPath, String targetDirectory, String fileName) throws Exception {

URL url = new URL(urlPath);

HttpURLConnection http = (HttpURLConnection) url.openConnection();

InputStream inputStream = http.getInputStream();

byte[] buff = new byte[1024 * 10];

OutputStream out = new FileOutputStream(new File(targetDirectory, fileName));

int lenth = -1;

while ((lenth = inputStream.read(buff)) != -1) {

out.write(buff, 0, len);

out.flush();

}

// 关闭资源

out.close();

inputStream.close();

http.disconnect();

}

*将文件打包成zip文件

public static ZipFile createZipFile(String templatePathZip, String fileName, File... files) {

try { // 创建zip包，指定路径和名称

final ZipFile zipFile = new ZipFile(templatePathZip + fileName);

// 向zip包中添加文件集合

final ArrayList fileAddZip = new ArrayList();

File file1 = zipFile.getFile();

if (file1.exists()) {

file1.delete();

}

// 向zip包中添加文件

for (File file : files) {

fileAddZip.add(file);

}

// 设置zip包的一些参数集合

final ZipParameters parameters = new ZipParameters();

// 是否设置密码(若passwordZip为空，则为false)

/*if (null != passwordZip && !passwordZip.equals("")) {

parameters.setEncryptFiles(true);

// 压缩包密码

parameters.setPassword(passwordZip);

} else { }*/

parameters.setEncryptFiles(false);

// 压缩方式(默认值)

parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);

// 普通级别(参数很多)

// parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);

// 加密级别

// parameters.setEncryptionMethod(Zip4jConstants.ENC_METHOD_STANDARD);

// 创建压缩包完成

zipFile.createZipFile(fileAddZip, parameters);

//压缩完成后删除文件

for (File file : files) {

file.delete();

}

return zipFile;

} catch (final Exception e) {

e.printStackTrace();

return null;

}

}

*下载生成的word文件并删除临时文件

private void download(File file, HttpServletRequest request, HttpServletResponse response) {

ServletOutputStream out = null;

FileInputStream inputStream = null;

try {

String filename = file.getName();

String userAgent = request.getHeader("User-Agent");

// 针对IE或者以IE为内核的浏览器：

if (userAgent.contains("MSIE") || userAgent.contains("Trident")) {

filename = java.net.URLEncoder.encode(filename, "UTF-8");

} else {

// 非IE浏览器的处理：

// filename = URLEncoder.encode(filename, "UTF-8");

filename = new String(filename.getBytes("UTF-8"), "ISO-8859-1");

}

response.setHeader("Content-disposition",

String.format("attachment; filename=\"%s\"", filename));

response.setContentType("application/download");

response.setCharacterEncoding("UTF-8");

out = response.getOutputStream();

inputStream = new FileInputStream(file);

byte[] buffer = new byte[1024 * 10];

int lenth = -1;

// 通过循环将读入的Word文件的内容输出到浏览器中

while ((lenth = inputStream.read(buffer)) != -1) {

out.write(buffer, 0, bytesToRead);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if (null != out) out.close();

if (null != inputStream) inputStream.close();

file.delete();

} catch (Exception e2) {

e2.printStackTrace();

}

}

}

注：部分代码是在网上查找的资料，然后根据自己需要写的