1、下载文件到本地

public void download(HttpServletResponse response){

String filePath ="";//文件路径

String fileName ="";//文件名称

// 读到流中

InputStream inStream = new FileInputStream(filePath);

// 设置输出的格式

response.reset();

response.setContentType("bin");

response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");

IOUtils.copy(inStream, response.getOutputStream());

}

2、java后端下载

方式一：

new URL(fileUrl + item.getcBhFileserver()).openStream()

方法二：

public Boolean addFile(String url, String id, String fileName) {

RequestCallback requestCallBack = new RequestCallback() {

@Override

public void doWithRequest(ClientHttpRequest request) throws IOException {

request.getHeaders().add("accept", MediaType.APPLICATION_OCTET_STREAM_VALUE);

}

};

ResponseExtractor responseExtractor = new ResponseExtractor() {

@Override

public Boolean extractData(ClientHttpResponse response) throws IOException {

if (response.getStatusCode() == HttpStatus.OK) {

//得到文件流

InputStream input = response.getBody();

return true;

}

return false;

}

};

return restTemplate.execute(url, HttpMethod.GET, requestCallBack, responseExtractor, id);

}

3、文件打包成zip

public void zipFilesAll() throws Exception {

String zipPath = "";//zip包路径

String zipFileName = "";//zip包名称

File zipFile = new File(zipFileName .toString());

// 创建 FileOutputStream 对象

FileOutputStream fileOutputStream = null;

// 创建 ZipOutputStream

ZipOutputStream zipOutputStream = null;

try {

//创建文件夹

zipFile = new File(zipPath );

FileUtils.forceMkdir(zipFile);

//创建文件

zipFile = new File(zipFileName .toString());

if (!zipFile.exists()) {

zipFile.createNewFile();

}

// 实例化 FileOutputStream 对象

fileOutputStream = new FileOutputStream(zipFileName.toString());

// 实例化 ZipOutputStream 对象

zipOutputStream = new ZipOutputStream(fileOutputStream);

// 创建 ZipEntry 对象

ZipEntry zipEntry = null;

for (CL cl: ClList) {

// 实例化 ZipEntry 对象，源文件数组中的当前文件

zipEntry = new ZipEntry(tCltjjl.getcClmc() + ".zip");

zipOutputStream.putNextEntry(zipEntry);

IOUtils.copy(new FileInputStream(cl.getcPath(), zipOutputStream);

}

} catch (Exception e) {

}finally{

//记得删除文件

}

}