调用 HttpURLConnection 时出现未处理的异常

Question

public  int coderesult (String urlstring) throws Exception {
    URL url = new URL(urlstring);
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
    //System.out.println("Response code is " + httpCon.getResponseCode());
    int mycode = httpCon.getResponseCode();
    return mycode;
}
public int displaycode () {
    int dispcode = 0;
    try {
        dispcode = coderesult(myurl);

    }
    catch (MalformedURLException e){
        e.printStackTrace();
    }catch(IOException e){
        e.printStackTrace();
    }finally {
    }
    return dispcode;
}

Android Studio 在 "dispcode = coderesult(myurl);" 中显示错误："Unhandled exception:java.lang.Exception"

Answer 1

您的 codeResult() 方法抛出 Exception

public  int coderesult (String urlstring) throws Exception {

因此，您必须专门捕获它 catch(Exception ex) ，或者声明从您的方法中抛出它。

捕获异常时，您要么捕获特定的异常类型，要么捕获更通用的父异常类型。您可以将所有捕获合并为一个捕获，因为所有内置 java 异常都从 Exception

扩展

catch(Exception ex){
    ex.printStackTrace();
}

Answer 2

使用这个

public  int coderesult (String urlstring) throws IOException

然后写

catch(IOException ie) {
            ie.printStackTrace();
}

调用 HttpURLConnection 时出现未处理的异常

Unhandled exception if call HttpURLConnection

java

android

exception-handling

httpurlconnection