我找到了一种修复我的代码的奇怪黑客方法,我想知道是否有人能解释为什么它有效。我正在编写与REST API通信的代码,以将视频文件上传到多个HTTP请求中。
我的一个视频部分请求连接有问题,但从未回复。该程序分五个部分上传视频,但它总是挂在五个部分的第三部分。我决定添加一个请求硬超时来强制程序跳过那个悬挂部分。好吧,加入那个计时器之后神奇地说,没有更多的挂断!
为什么会出现这种情况?请求实际上没有超时,但添加此代码可以保持程序的正常运行。
private void uploadParts(String assetId) throws IOException {
//set up post request
HttpClient client = HttpClientBuilder.create().build();
String url = "";
//prepare video
File video = new File("files/video.mp4");
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(video));
int partMaxSize = 1024 * 1024 * 5;
byte[] buffer = new byte[partMaxSize];
double fileSize = video.length();
System.out.println(fileSize);
System.out.println(fileSize / partMaxSize);
int parts = (int) Math.ceil(fileSize / partMaxSize);
System.out.println(parts);
for(int i = 1; i < parts+1; i++) {
String partNumber = i + "";
System.out.println("part: " + partNumber);
int partSize = (int) (i < parts ? partMaxSize : fileSize);
fileSize -= partSize;
int tmp = 0;
tmp = bis.read(buffer);
url = String.format("https://www.site.com/upload/multipart/%s/%s", assetId, partNumber);
final HttpPut request = new HttpPut(url);
request.addHeader("Authorization", "Bearer " + accessToken);
request.addHeader("Content-Type", "application/octet-stream");
request.setEntity(new ByteArrayEntity(buffer));
//Magical code start
int hardTimeout = 5; // seconds
TimerTask task = new TimerTask() {
@Override
public void run() {
if (request != null) {
request.abort();
}
}
};
new Timer(true).schedule(task, hardTimeout * 1000);
//Magical code end
HttpResponse response = client.execute(request);
System.out.println(response.getStatusLine().getReasonPhrase());
}
bis.close();
}
如果我遗漏了神奇的代码部分,我的代码会挂在第三部分。如果我包含它,程序运行正常。
答案 0 :(得分:6)
我找到了答案!原来HttpClient一次只允许一定数量的连接。根据我的代码,默认的最大连接数为2.我需要在完成后关闭每个连接并且上传运行正常。
固定代码添加了请求连接释放。
private void uploadParts(String assetId) throws IOException {
//set up post request
HttpClient client = HttpClientBuilder.create().build();
String url = "";
//prepare video
File video = new File("files/video.mp4");
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(video));
int partMaxSize = 1024 * 1024 * 5;
byte[] buffer = new byte[partMaxSize];
double fileSize = video.length();
System.out.println(fileSize);
System.out.println(fileSize / partMaxSize);
int parts = (int) Math.ceil(fileSize / partMaxSize);
System.out.println(parts);
for(int i = 1; i < parts+1; i++) {
String partNumber = i + "";
System.out.println("part: " + partNumber);
int partSize = (int) (i < parts ? partMaxSize : fileSize);
fileSize -= partSize;
int tmp = 0;
tmp = bis.read(buffer);
url = String.format("https://www.site.com/upload/multipart/%s/%s", assetId, partNumber);
final HttpPut request = new HttpPut(url);
request.addHeader("Authorization", "Bearer " + accessToken);
request.addHeader("Content-Type", "application/octet-stream");
request.setEntity(new ByteArrayEntity(buffer));
//Magical code start
int hardTimeout = 5; // seconds
TimerTask task = new TimerTask() {
@Override
public void run() {
if (request != null) {
request.abort();
}
}
};
new Timer(true).schedule(task, hardTimeout * 1000);
//Magical code end
HttpResponse response = client.execute(request);
request.releaseConnection();
System.out.println(response.getStatusLine().getReasonPhrase());
}
bis.close();
}
计时器正在工作,因为它在10秒后关闭了我的旧连接。感谢您的意见,伙计们。