场景
调用第三方文件下载接口,通过HttpClient的方式进行调用,需要从HttpResponse解析出参数,并读取流变成文件下载 调用部分
/**
* 调用GET请求 文件下载
*
*/
public static void fileDownload(String url,String cookie) throws Exception {
HttpClient client = null;
HttpGet get = new HttpGet(url);
get.setHeader("Content-Type", "application/x-www-form-urlencoded");
get.setHeader("Cookie", cookie);
try {
RequestConfig.Builder customReqConf = RequestConfig.custom();
customReqConf.setConnectTimeout(DEFAULT_CONNECTION_TIME_OUT.intValue());
customReqConf.setSocketTimeout(DEFAULT_CONNECTION_TIME_OUT.intValue());
get.setConfig(customReqConf.build());
HttpResponse res = null;
client = createSSLInsecureClient();
res = client.execute(get);
HttpEntity entity = res.getEntity();
InputStream inputStream = entity.getContent();
//这里的流文件亦可以直接转换成 MutiParFile文件 ,
////MultipartFile multipartFile = new MockMultipartFile("temp.jpg","temp.jpg","", inputStream);
String rootPath ="C:\\Users\\Administrator\\Desktop\\";
String suffix = ".png";
Long index = System.currentTimeMillis();
String fileName = rootPath + index + suffix;
writeToLocal(fileName,inputStream);
} finally {
get.releaseConnection();
if ((url.startsWith("https")) && (client != null) && ((client instanceof CloseableHttpClient))) {
((CloseableHttpClient) client).close();
}
}
}
/**
* 文件下载
* @param destination 下载路径
* @param input
* @throws IOException
*/
public static void writeToLocal(String destination, InputStream input)
throws IOException {
int index;
byte[] bytes = new byte[1024];
FileOutputStream downloadFile = new FileOutputStream(destination);
while ((index = input.read(bytes)) != -1) {
downloadFile.write(bytes, 0, index);
downloadFile.flush();
}
input.close();
downloadFile.close();
}
多个文件压缩并批量下载
private void getZip(List<String> files,HttpServletResponse response){
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition","attachment;filename=人脸图像.zip");
String rootPath = configuration.getRootpath();
if(CollectionUtils.isEmpty(files)){
log.error(rootPath + "路径不存");
}
String zipName ="人脸图像.zip";
String zipPath = rootPath + zipName;
BufferedInputStream bis =null;
try {
//ZipOutputStream zipOutput = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipPath)));
ZipOutputStream zipOutput = new ZipOutputStream(response.getOutputStream());
for(String str : files) {
File file = new File(rootPath ,str);
if(!file.exists()){
log.error("文件被删除");
continue;
}
ZipEntry zEntry = new ZipEntry(file.getName());
zipOutput.putNextEntry(zEntry);
bis = new BufferedInputStream(new FileInputStream(file));
byte[] buffer = new byte[1024];
int read = 0;
while((read = bis.read(buffer)) != -1){
zipOutput.write(buffer, 0, read);
}
}
zipOutput.finish();
bis.close();
zipOutput.close();
} catch (Exception e) {
e.printStackTrace();
log.error(e.getMessage());
}
}