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
}
}
