Streaming filter示例代码使用问题

Question

import twitter4j.FilterQuery;
import twitter4j.StallWarning;
import twitter4j.Status;
import twitter4j.StatusDeletionNotice;
import twitter4j.StatusListener;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.TwitterStream;
import twitter4j.TwitterStreamFactory;
import twitter4j.conf.ConfigurationBuilder;

import java.util.ArrayList;
import java.util.Arrays;


public class winning {

    public static ConfigurationBuilder cb;
    public static TwitterFactory tf;
    public static twitter4j.Twitter tw;


    public static void main(String[] args) throws TwitterException {   

        ConfigurationBuilder cb = new ConfigurationBuilder();
        cb.setDebugEnabled(true)
            .setOAuthConsumerKey("")
            .setOAuthConsumerSecret("")
            .setOAuthAccessToken("-")
            .setOAuthAccessTokenSecret("");        

         tf= new TwitterFactory(cb.build());
         tw= tf.getInstance();       


        if (args.length > 1) {
            System.out.println("Usage: java twitter4j.examples.PrintFilterStream [follow(comma separated numerical user ids)] [track(comma separated filter terms)]");
            System.exit(-1);
        }

        StatusListener listener = new StatusListener() {
            @Override
            public void onStatus(Status status) {
                System.out.println("@" + status.getUser().getScreenName() + " - " + status.getText());
            }

            @Override
            public void onDeletionNotice(StatusDeletionNotice statusDeletionNotice) {
                System.out.println("Got a status deletion notice id:" + statusDeletionNotice.getStatusId());
            }

            @Override
            public void onTrackLimitationNotice(int numberOfLimitedStatuses) {
                System.out.println("Got track limitation notice:" + numberOfLimitedStatuses);
            }

            @Override
            public void onScrubGeo(long userId, long upToStatusId) {
                System.out.println("Got scrub_geo event userId:" + userId + " upToStatusId:" + upToStatusId);
            }

            @Override
            public void onStallWarning(StallWarning warning) {
                System.out.println("Got stall warning:" + warning);
            }

            @Override
            public void onException(Exception ex) {
                ex.printStackTrace();
            }
        };

        TwitterStream twitterStream = new TwitterStreamFactory().getInstance();
        twitterStream.addListener(listener);
        ArrayList<Long> follow = new ArrayList<Long>();
        ArrayList<String> track = new ArrayList<String>();
        for (String arg : args) {
            if (isNumericalArgument(arg)) {
                for (String id : arg.split(",")) {
                    follow.add(Long.parseLong(id));
                }
            } else {
                track.addAll(Arrays.asList(arg.split(",")));
            }
        }
        long[] followArray = new long[follow.size()];
        for (int i = 0; i < follow.size(); i++) {
            followArray[i] = follow.get(i);
        }
        String[] trackArray = track.toArray(new String[track.size()]);

        // filter() method internally creates a thread which manipulates TwitterStream and calls these adequate listener methods continuously.
        twitterStream.filter(new FilterQuery(0, followArray, trackArray));
    }

    private static boolean isNumericalArgument(String argument) {
        String args[] = argument.split(",");
        boolean isNumericalArgument = true;
        for (String arg : args) {
            try {
                Integer.parseInt(arg);
            } catch (NumberFormatException nfe) {
                isNumericalArgument = false;
                break;
            }
        }
        return isNumericalArgument;
    }   
}

这是来自 twitter4j 的示例代码。

每次我尝试运行这个我都会得到

"Usage: java twitter4j.examples.PrintFilterStream [follow(comma separated numerical user ids)] [track(comma separated filter terms)]"

即使我添加了曲目 array.and 用分隔，所以它可以被拆分并将其添加到列表索引中。

还是我没理解用法？

感谢任何帮助。

Answer 1

public static void main(String[] args)

you winning class（请遵循命名约定并以大写字母开头 Class 名称），接受命令行参数作为 Strings String[] args

if (args.length > 1) {

你有上面的代码，这个条件显然是成立的，因为你提到你在输出和程序退出中看到 sysout "Usage: java twitter4j.examples.PrintFilterStream [follow(comma separated numerical user ids)] [track(comma separated filter terms)]"。

因此，您必须确保仅将一个参数作为程序的输入传递，因此 args.length 仍然存在只有 1

查看您的代码，您稍后使用 args 将其与、拆分。所以你对程序的输入必须类似于

"1,2,3,4,5,6"

"a,b,c,d,e,f"

您从命令行调用的程序应该类似于：

java winning "1,2,3,4,5,6"

供大家参考学习 Command line arguments Command args

Streaming filter示例代码使用问题

Streaming filter sample code usage issue

java

twitter4j