如何在一個try/catch塊中捕獲異常和SocketTimeOut異常

Question

我已經爲URLconnection以及Parser類實現了try catch塊，如下所示。

try { 
    Url uri = new Url(urlString); 
    Parser parse = new Parser(uri); 
} catch (Exception e) 
{ 
    //ignore some other exceptions 
} 
catch (SocketTimeOutException e) 
{ 
    //I want to catch this exception and do some thing or restart 
    //if it's a timeout issue. 
    //I am using a proxy for the network connection at JVM setting 
    //using setProperty  
} 

所以，我的問題是如何根據該SocketTimeOutException情況採取相應的行動，併爲其他異常忽略。

感謝，

Answer 1

爲Java規範說SocketTimeoutException catch子句（http://docs.oracle.com/javase/specs/jls/se7/html/jls-11.html#jls-11.2.3和http://docs.oracle.com/javase/specs/jls/se7/html/jls-14.html#jls-14.20），首先匹配，首先執行。

只需翻轉你的catch子句：

try { 
Url uri = new Url(urlString); 
Parser parse = new Parser(uri); 
} catch (SocketTimeOutException e) { 
//I want to cache this ecption and do some thing or restart based 
//if its timeout issue 
//am using proxy for the network connection at JVM setting 
//using setProperty 
} catch (Exception e) { 
//ingnore some other excpetions 
} 

Answer 2

趕上SocketTimeOutException第一：

try { 
    // do stuff 
} catch (SocketTimeOutException e) { 
    // restart or do whatever you need to do 
} catch (Exception e) { 
    // do something else 
} 

Answer 3

把更具體的異常類型上面更爲一般類型的，所以就把上面Exception

Answer 4

如何捕捉異常並在一個try/catch塊一個了socketTimeout異常？如果您wan't到只有一個catch塊，那麼你可以像這樣

try { 
      URI uri = new URI(urlString); 
      Parser parse = new Parser(uri); 

      } catch(Exception e) {    
       if (e instanceof SocketTimeoutException) { 
        // do something 
       } 
      }