Java 如何使用 URLConnection 超时
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How to use URLConnection Timeout
提问by Austin
I am trying to sort through a list of SOCKS proxies, and figure out which ones have a connect and read time of less than 1000ms, here is my code
我正在尝试对 SOCKS 代理列表进行排序，并找出哪些代理的连接和读取时间小于 1000 毫秒，这是我的代码
for(Proxy p : proxies) {
try {
URLConnection testConnection = testUrl.openConnection(p);
testConnection.setConnectTimeout(TIMEOUT_VALUE);
testConnection.setReadTimeout(TIMEOUT_VALUE);
success.add(p);
} catch(SocketTimeoutException ste) {
System.out.println("Proxy " + p.address().toString() + " timed out.");
}
}
But every single one of them passes the test, even when I do TIMEOUT_VALUE = 1;What am I doing wrong? Thanks for any help.
但是他们中的每一个都通过了测试，即使我做TIMEOUT_VALUE = 1;我做错了什么？谢谢你的帮助。
采纳答案by Thresh
I assume your problem is you don't read anything from connection. If I set TIMEOUT_VALUEtoo low, I get an exception. Whether I read all response or only one line did not affect the resulting time, I guess it is because I got whole answer in one packet.
我认为您的问题是您没有从连接中读取任何内容。如果我设置TIMEOUT_VALUE得太低，我会得到一个例外。无论我阅读所有响应还是仅阅读一行都不会影响结果时间，我想这是因为我在一个数据包中得到了完整的答案。
Here is the measurement I used (without proxies):
这是我使用的测量值（无代理）：
int TIMEOUT_VALUE = 1000;
try {
URL testUrl = new URL("http://google.com");
StringBuilder answer = new StringBuilder(100000);
long start = System.nanoTime();
URLConnection testConnection = testUrl.openConnection();
testConnection.setConnectTimeout(TIMEOUT_VALUE);
testConnection.setReadTimeout(TIMEOUT_VALUE);
BufferedReader in = new BufferedReader(new InputStreamReader(testConnection.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null) {
answer.append(inputLine);
answer.append("\n");
}
in.close();
long elapsed = System.nanoTime() - start;
System.out.println("Elapsed (ms): " + elapsed / 1000000);
System.out.println("Answer:");
System.out.println(answer);
} catch (SocketTimeoutException e) {
System.out.println("More than " + TIMEOUT_VALUE + " elapsed.");
}
回答by Ronald
I use
我用
System.getProperties().put("proxySet", "true");
System.getProperties().put("http.proxyHost", "192.168.10.121");
System.getProperties().put("http.proxyPort", "8080");
//System.getProperties().put("http.nonProxyHosts", "8080");
