为什么我已经抛出异常 java.net.MalformedURLException 却收到未报告的异常？

Question

免责声明：我已经 Java 很久没做了。

我创建了这个单例 class 来创建一个 HttpURLConnection。

public class EstablishConnection {
    HttpURLConnection conn = setupConn("some url");
    private static final EstablishConnection instance = new EstablishConnection();
    
    //private constructor to avoid client applications to use constructor
    private EstablishConnection(){}

    public static EstablishConnection getInstance(){
        return instance;
    }
    
    private static HttpURLConnection setupConn(String addr) throws MalformedURLException, IOException, ProtocolException {
        URL url = new URL(addr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setReadTimeout(10000);
        conn.setConnectTimeout(15000);
        conn.setRequestMethod("POST");
        conn.setDoInput(true);
        conn.setDoOutput(true);
        return conn;
    }
}

为什么我在 setupConn 中抛出异常时会收到未报告的 MalformedURLException 异常？

|       HttpURLConnection conn = setupConn("some url");
unreported exception java.net.MalformedURLException; must be caught or declared to be thrown

Answer 1

您正在从 setupConn 函数中抛出异常，但在此处调用它时并未处理抛出的异常：

HttpURLConnection conn = setupConn("some url");

您可以在 setupConn 函数中使用 try catch 处理异常，或者您可以在构造函数中调用该函数，然后从那里重新抛出。

为什么我已经抛出异常 java.net.MalformedURLException 却收到未报告的异常？

Why am I getting a unreported exception java.net.MalformedURLException when I'm throwing it already?

java

http

malformedurlexception