Java twitter4j 2.2.5中的空指针异常
我必须得到与搜索查询相关的推文。所以我用的是twitter4j2.2.5。当我输入一个单词进行搜索时,它会给出错误 我必须访问twitter中的tweets,并将其存储在数据库中,然后用java进行情感分析Java twitter4j 2.2.5中的空指针异常,java,exception,twitter,twitter4j,Java,Exception,Twitter,Twitter4j,我必须得到与搜索查询相关的推文。所以我用的是twitter4j2.2.5。当我输入一个单词进行搜索时,它会给出错误 我必须访问twitter中的tweets,并将其存储在数据库中,然后用java进行情感分析 public class TweetOperator { private static final String consumerKey = "XXXXXXXXXXXXXXXXxxxxxxxxxxx"; private static final String consum
public class TweetOperator {
private static final String consumerKey = "XXXXXXXXXXXXXXXXxxxxxxxxxxx";
private static final String consumerSecret = "XXXXXXXXXXXXXXXXxxxxxxxxxxx";;
private static final String tokenKey = "XXXXXXXXXXXXXXXXxxxxxxxxxxx";;
private static final String tokenSecret = "XXXXXXXXXXXXXXXXxxxxxxxxxxx";;
Twitter twitter;
public TweetOperator(int mode) {
try {
db = Operator.getInstance();
} catch(Exception ex) {
ex.printStackTrace();
}
this.mode = mode;
AccessToken token = new AccessToken(tokenKey, tokenSecret);
twitter.setOAuthAccessToken(token);// Exception occurs here
twitter = new TwitterFactory().getInstance();
twitter.setOAuthConsumer(consumerKey, consumerSecret);
}
@Override
protected void finalize() throws Throwable{
super.finalize();
}
}
堆栈跟踪:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at sentimentanalysis.twitterapi.TweetOperator.<init>(TweetOperator.java:57)
at sentimentanalysis.search.Search.<init>(Search.java:34)
at sentimentanalysis.view.SentimentAnalysisView.searchSubmitActionPerformed(SentimentAnalysisView.java:249)
at sentimentanalysis.view.SentimentAnalysisView.access$200(SentimentAnalysisView.java:22)
at sentimentanalysis.view.SentimentAnalysisView$3.actionPerformed(SentimentAnalysisView.java:135)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:708)
at java.awt.EventQueue$4.run(EventQueue.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
线程“AWT-EventQueue-0”java.lang.NullPointerException中的异常
twitterapi.TweetOperator.(TweetOperator.java:57)
搜索(search.java:34)
在momentanalysis.view.momentanalysisview.searchSubmitActionPerformed(momentanalysisView.java:249)
在mountainAnalysis.view.mountainAnalysisView.access$200(mountainAnalysisView.java:22)
在感伤分析.view.感伤分析视图$3.actionPerformed(感伤分析视图.java:135)
在javax.swing.AbstractButton.fireActionPerformed上(AbstractButton.java:2018)
位于javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
在javax.swing.DefaultButtonModel.fireActionPerformed上(DefaultButtonModel.java:402)
在javax.swing.DefaultButtonModel.setPressed中(DefaultButtonModel.java:259)
在javax.swing.plaf.basic.BasicButtonListener.MouseRelease(BasicButtonListener.java:252)
位于java.awt.Component.ProcessMouseeEvent(Component.java:6505)
位于javax.swing.JComponent.ProcessMouseeEvent(JComponent.java:3320)
位于java.awt.Component.processEvent(Component.java:6270)
位于java.awt.Container.processEvent(Container.java:2229)
位于java.awt.Component.dispatchEventImpl(Component.java:4861)
位于java.awt.Container.dispatchEventImpl(Container.java:2287)
位于java.awt.Component.dispatchEvent(Component.java:4687)
位于java.awt.LightweightDispatcher.RetargetMouseeEvent(Container.java:4832)
位于java.awt.LightweightDispatcher.ProcessMouseeEvent(Container.java:4492)
位于java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
位于java.awt.Container.dispatchEventImpl(Container.java:2273)
位于java.awt.Window.dispatchEventImpl(Window.java:2719)
位于java.awt.Component.dispatchEvent(Component.java:4687)
位于java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
在java.awt.EventQueue.access$200(EventQueue.java:103)
位于java.awt.EventQueue$3.run(EventQueue.java:694)
在java.awt.EventQueue$3.run(EventQueue.java:692)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
在java.awt.EventQueue$4.run(EventQueue.java:708)
在java.awt.EventQueue$4.run(EventQueue.java:706)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
位于java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
位于java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
在java.awt.EventDispatchThread.PumpeEventsforFilter(EventDispatchThread.java:161)
位于java.awt.EventDispatchThread.PumpeEventsforHierarchy(EventDispatchThread.java:150)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
在java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
在调用
twitter.setOAuthAccessToken
后,您将twitter
分配给new TwitterFactory().getInstance()
twitter
实例变量被初始化为null,您将得到null指针异常
更改行顺序应该可以:
twitter = new TwitterFactory().getInstance();
twitter.setOAuthAccessToken(token);
调用
twitter.setOAuthAccessToken
后,您将twitter
分配给new TwitterFactory().getInstance()
twitter
实例变量被初始化为null,您将得到null指针异常
更改行顺序应该可以:
twitter = new TwitterFactory().getInstance();
twitter.setOAuthAccessToken(token);
最近Twitter升级了API,只接受SSL请求。但是TwitterFactory默认禁用SSL 添加到Nigel Tufnel代码中,更新代码如下
ConfigurationBuilder builder = new ConfigurationBuilder();
builder.setUseSSL(true);
TwitterFactory factory = new TwitterFactory(builder.build());
Twitter twitter = factory.getInstance();
这条推特是一条被抹黑的消息。Status是我们需要使用的新界面。请检查下面的示例程序
package twitter;
import java.util.List;
import twitter4j.Query;
import twitter4j.QueryResult;
import twitter4j.Status;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.auth.AccessToken;
import twitter4j.conf.ConfigurationBuilder;
public class XYZ {
public static void main(String[] args) {
String oauth_consumer_key="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
String oauth_token="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
String oauth_consumer_secret="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
String oauth_token_secret ="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
ConfigurationBuilder builder = new ConfigurationBuilder();
builder.setUseSSL(true);
TwitterFactory factory = new TwitterFactory(builder.build());
Twitter twitter = factory.getInstance();
twitter.setOAuthConsumer(oauth_consumer_key, oauth_consumer_secret);
AccessToken accessToken = new AccessToken(oauth_token, oauth_token_secret);
twitter.setOAuthAccessToken(accessToken);
Query arg0 = new Query("query");
try {
QueryResult queryResult = twitter.search(arg0 );
System.out.println(queryResult.getCount());
List<Status> statuses = queryResult.getTweets();
for(Status status:statuses){
System.out.println(status.getText());
}
} catch (TwitterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
packagetwitter;
导入java.util.List;
导入twitter4j.Query;
导入twitter4j.QueryResult;
导入twitter4j.状态;
导入twitter4j.Twitter;
导入twitter4j.TwitterException;
导入twitter4j.TwitterFactory;
导入twitter4j.auth.AccessToken;
导入twitter4j.conf.ConfigurationBuilder;
公共类XYZ{
公共静态void main(字符串[]args){
字符串oauth_consumer_key=“xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx”;
字符串oauth_token=“xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx”;
字符串oauth_consumer_secret=“xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx”;
字符串oauth_token_secret=“xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx”;
ConfigurationBuilder=新的ConfigurationBuilder();
builder.setusesl(true);
TwitterFactory=newTwitterFactory(builder.build());
Twitter=factory.getInstance();
setOAuthConsumer(oauth_consumer_key,oauth_consumer_secret);
AccessToken AccessToken=新的AccessToken(oauth_token,oauth_token_secret);
setOAuthAccessToken(accessToken);
查询arg0=新查询(“查询”);
试一试{
QueryResult QueryResult=twitter.search(arg0);
System.out.println(queryResult.getCount());
列表状态=queryResult.getTweets();
用于(状态:状态){
System.out.println(status.getText());
}
}捕获(twitter异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
}