Java 使用try-catch跳过异常会导致陷入无限循环

对于某些URL，

BufferedReader

达到连接超时，并抛出一个中断整个程序的异常，这是我遇到的困难。我需要的是检查连接打开所花费的时间，如果它达到阈值（必须小于超时值），它将跳过该URL打开流，然后获取下一个URL，或者它以不会导致程序停止的方式处理超时。你知道怎么做吗

URL url = new URL(line);
URLConnection connection = url.openConnection();
if (connection instanceof HttpURLConnection) {
HttpURLConnection httpConn = (HttpURLConnection) connection;
int statusCode = httpConn.getResponseCode();
if (statusCode <= 200 && statusCode < 300)
  try{                 
   BufferedReader brURL = new BufferedReader(new InputStreamReader(url.openStream()));    
   while((tempLine = brURL.readLine())!=null){                          
   UrlMatcher=UrlPattern.matcher(tempLine);
   java.util.logging.Logger.getLogger(SimpleCrawler.class.getName()).log(Level.SEVERE, tempLine);
           if(UrlMatcher.find())
            {
                String resultURL=UrlMatcher.group();
                fop.write(resultURL.toLowerCase().getBytes());
                fop.write(System.getProperty("line.separator").getBytes());

               System.out.println(resultURL);
          }


                                            }                
  }
                           catch(ConnectException ex){}

             }

---

您应该使用

setConnectTimeout

，然后捕获

SocketTimeoutException

try { 
HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
 con.setConnectTimeout(5000); //set timeout to 5 seconds 
return (con.getResponseCode() == HttpURLConnection.HTTP_OK); 
} 
catch (java.net.SocketTimeoutException e) { return false; }

---

请看这里。

为什么不捕获异常？@VinceEmigh您的意思是使用try-catch？是的，捕获

ConnectionException

。如果抛出一个运行时expetion，如果您捕获它，它不会使线程崩溃it@VinceEmigh那怎么抓住它呢？我的意思是，在这种情况下，catch部分会是什么？是的，因为抛出了一个

ConnectException

，这就是您想要捕获的异常。它说

将返回类型更改为Boolean

，这样做，或者在连接超时时将

return false

更改为您需要的任何内容。@EJP如果我将其更改为Boolean，那么主线程必须是布尔类型，这是不可能的。@EJP此外，我已经提到了我在连接超时时想要的，只是跳过URL并从brURL获取下一个URL。我必须说他的回答根本不起作用，它仍然抛出异常并中断线程。然而，我的问题中上面的代码通过了这一点，但随后，我将陷入一个无限循环，我不知道为什么至

继续，或任何您需要进入下一个URL的内容。您还没有发布代码的这一部分，期望其他人猜测可能需要什么是不合理的。
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SEVERE: flashvars.enableAPI = "true";
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SEVERE: flashvars.galleryURL = "/svgallerysource.asp?galleryid=685";
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SEVERE: <style type="text/css">
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SEVERE: 
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SEVERE: <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
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SEVERE: <script type="text/javascript" src="/jplayer/jquery.jplayer.min.js"></script>
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SEVERE: <script type="text/javascript" src="/jplayer/jquery.jplayer.inspector.js"></script>
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SEVERE: <link rel="stylesheet" href="/css/colorbox.css" />
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SEVERE: 
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SEVERE: 
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SEVERE: <script>
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SEVERE: var _prum = [['id', '5397955dabe53dbb3ea78d70'],
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SEVERE:              ['mark', 'firstbyte', (new Date()).getTime()]];
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SEVERE:     var s = document.getElementsByTagName('script')[0]
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SEVERE:     
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SEVERE: body
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SEVERE: {
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SEVERE: background-color: #ffffff;
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try { 
HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
 con.setConnectTimeout(5000); //set timeout to 5 seconds 
return (con.getResponseCode() == HttpURLConnection.HTTP_OK); 
} 
catch (java.net.SocketTimeoutException e) { return false; }