指定默认值

 URL test = null; 
     String inputLine = null; 
     BufferedReader in = null; 
     try { 
      test = new URL("http://localhost/out.php"); // if connection down 
     } catch (MalformedURLException e) { 
      inputLine = "test_synntax"; 
     } 
     try { 
     in = new BufferedReader(new InputStreamReader(test.openStream())); 
     ...

如何，如果默认的URL解析失败在好日子指定默认值

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2012-12-02 BJ_fr

问题你不清楚你要做什么吗？ –

并请形成适当的问题标题。 –

你在做什么样的工作呢？ – PermGenError

您需要调用URL.openConnection第一，然后把你的默认值在IOException块：

try { 
    test = new URL("http://localhost/out.php"); 
    URLConnection urlConn = test.openConnection(); 
    in = new BufferedReader(new InputStreamReader(urlConn.getInputStream())); 
} catch (MalformedURLException e) { 
    inputLine = "test_synntax"; 
} catch (IOException e) { 
    inputLine = "test_synntax"; 
}

来源

2012-12-02 14:15:12 Reimeus

try { 
    test = new URL("http://localhost/out.php"); 
    //I believe you need this and it throws IOException on timeout. 
    //Though it's still unclear to me what you mean by 'resolution' and 'disponible wifi/3g`? 
    test.openConnection(); 
} catch (MalformedURLException | IOException e) { 
    inputLine = "test_synntax"; 
}

这个例子语境中不应WIFI/3G连接disponible，谢谢你们指定的inputline的价值是java的7多重捕获语法，请介意。

来源

2012-12-02 14:11:32 nullpotent

-如果的WiFi/3G失败，则它会给UnknownHostException。

所以，你可以处理他们这样....

try { 
      test = new URL("http://localhost/out.php"); 

     } catch (UnknownHostException e) { 

      inputLine = "Connection error"; 
    }

来源

2012-12-02 14:11:42

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