Question

在我的Android Studio项目中，我发现很多＆＃34;错误：（38,45）错误：未报告的异常IOException;必须被抓住或宣布被扔掉＃34;错误。如何解决这些错误？

这是我的代码：

public class ActivityHome extends Activity {

    private final static String QUEUE_NAME = "AndroidJava";

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("xx.xx.xx.xx");

        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        String message = "Hello Java!";
        channel.basicPublish("", QUEUE_NAME, null, message.getBytes("UTF-8"));
        System.out.println(" [x] Sent '" + message + "'");

        channel.close();
        connection.close();

    }

}

Answer 1

我建议通过Javadocs阅读ActivityHome.onCreate()中使用的依赖关系来确定抛出IOException的内容，特别是与数据库相关的javadoc。一旦确定了引发异常的内容，就可以使用try catch块来解决可能出现的问题：

try{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);



    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("xx.xx.xx.xx");

    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();

    channel.queueDeclare(QUEUE_NAME, false, false, false, null);
    String message = "Hello Java!";
    channel.basicPublish("", QUEUE_NAME, null, message.getBytes("UTF-8"));
    System.out.println(" [x] Sent '" + message + "'");

    channel.close();
    connection.close();
} catch(IOException e) {
    e.printStackTrace() //Or log it to a file, or clean up resources
}

或throws强制任何调用你的方法代替处理它：

public onCreate(Bundle savedInstanceState) throws IOException { 
    //body
}

Java Guide to Exceptions有助于确定哪种更适合您的用例。

如何处理IOException

1 个答案: