问题描述
根据教程链接HTML
导入https://www.tutorialspoint.com/jsoup/jsoup_load_file.htm
文件时
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
public class jsoupTester {
public static void main(String[] args) throws IOException,URISyntaxException {
URL path = ClassLoader.getSystemResource("test.htm");
File input = new File(path.toURI());
Document document = Jsoup.parse(input,"UTF-8","");
System.out.println(document.title());
}
}
运行程序时出现此错误:
Exception in thread "main" java.lang.NullPointerException
at jsoupTester.main(jsoupTester.java:13)
注意:jsoupTester.java文件和temp.htm位于同一位置
我可以知道如何解决此问题吗?您的建议将不胜感激:)
解决方法
您是否已正确检查网站?代码文档显示了这一点
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
public class JsoupTester {
public static void main(String[] args) throws IOException,URISyntaxException {
URL path = ClassLoader.getSystemResource("test.htm");
File input = new File(path.toURI());
Document document = Jsoup.parse(input,"UTF-8"); // Only 2 parameters
System.out.println(document.title());
}
}
错误
Document document = Jsoup.parse(input,"UTF-8",""); // 3rd parameter is not included in the documentation
如您所见,错误是您有另一个冗余参数,我认为这是导致错误的原因。在您的代码中删除该""
,它将正常工作。希望能回答您的问题:)