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问题描述
我正在开发健全性检查Web应用程序。我尝试使用HttpUrlConnection方法获取url响应，但出现UnknownHostException。
I am developing a sanity check web application. I tried getting url response using HttpUrlConnection method but I am getting UnknownHostException.
System.setProperty("java.net.preferIPv4Stack" , "true");
String[] uat_targetUrls={"https://www.google.com"};
String[] uat_targetResponse=new String[uat_targetUrls.length];
HttpURLConnection httpUrlConn;
httpUrlConn = (HttpURLConnection) new URL(uat_targetUrls[i])
.openConnection();
httpUrlConn.setRequestMethod("GET");
httpUrlConn.setConnectTimeout(30000);
httpUrlConn.setReadTimeout(30000);
if(httpUrlConn.getResponseCode()==200)
uat_targetResponse[i]="UP";
else
uat_targetResponse[i]="DOWN";
执行此操作时，我得到各种URL的UnknownHostException。谁可以帮我这个事。我正在使用Eclipse IDE。这是我得到的错误：
When executing this, I am getting UnknownHostException for various urls. Can anyone help me on this. I am using Eclipse IDE. This is the error I am getting:
java.net.UnknownHostException: www.google.com
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
谢谢。
推荐答案
问题必定是您计算机上的网络问题。
The problem must be a networking issue on your machine.
您的代码对我有用（有一些小的修复以修复丢失的循环变量 i ）：
Your code works for me (with some minor fixes to repair the missing loop variable i):
public static void main(String[] args) throws Exception {
System.setProperty("java.net.preferIPv4Stack", "true");
String[] uat_targetUrls = { "https://www.google.com" };
String[] uat_targetResponse = new String[uat_targetUrls.length];
HttpURLConnection httpUrlConn;
httpUrlConn = (HttpURLConnection) new URL(uat_targetUrls[0])
.openConnection();
httpUrlConn.setRequestMethod("GET");
httpUrlConn.setConnectTimeout(30000);
httpUrlConn.setReadTimeout(30000);
if (httpUrlConn.getResponseCode() == 200)
uat_targetResponse[0] = "UP";
else
uat_targetResponse[0] = "DOWN";
System.out.println(uat_targetResponse[0]);
}
输出： UP
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