jsoup教程抛出java.lang.IllegalArgumentException
我遵循Jsoup示例来尝试理解它是如何工作的,并且复制并粘贴了所有代码,但是我在线程主java.lang.IllegalArgumentException:at org.Jsoup.helper.Validate.isTrueValidate.java:45中不断收到错误“Exception” 位于jsoup.examples.ListLinks.mainListLinks.java:21’。IDE是NetBeans。错误在哪里jsoup教程抛出java.lang.IllegalArgumentException,java,jsoup,Java,Jsoup,我遵循Jsoup示例来尝试理解它是如何工作的,并且复制并粘贴了所有代码,但是我在线程主java.lang.IllegalArgumentException:at org.Jsoup.helper.Validate.isTrueValidate.java:45中不断收到错误“Exception” 位于jsoup.examples.ListLinks.mainListLinks.java:21’。IDE是NetBeans。错误在哪里 package jsoup.examples; import or
package jsoup.examples;
import org.jsoup.Jsoup;
import org.jsoup.helper.Validate;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.IOException;
/**
* Example program to list links from a URL.
*/
public class ListLinks {
public static void main(String[] args) throws IOException {
Validate.isTrue(args.length == 1, "http://news.ycombinator.com/");
String url = args[0];
print("Fetching %s...", url);
Document doc = Jsoup.connect(url).get();
Elements links = doc.select("a[href]");
Elements media = doc.select("[src]");
Elements imports = doc.select("link[href]");
print("\nMedia: (%d)", media.size());
for (Element src : media) {
if (src.tagName().equals("img"))
print(" * %s: <%s> %sx%s (%s)",
src.tagName(), src.attr("abs:src"), src.attr("width"), src.attr("height"),
trim(src.attr("alt"), 20));
else
print(" * %s: <%s>", src.tagName(), src.attr("abs:src"));
}
print("\nImports: (%d)", imports.size());
for (Element link : imports) {
print(" * %s <%s> (%s)", link.tagName(),link.attr("abs:href"), link.attr("rel"));
}
print("\nLinks: (%d)", links.size());
for (Element link : links) {
print(" * a: <%s> (%s)", link.attr("abs:href"), trim(link.text(), 35));
}
}
private static void print(String msg, Object... args) {
System.out.println(String.format(msg, args));
}
private static String trim(String s, int width) {
if (s.length() > width)
return s.substring(0, width-1) + ".";
else
return s;
}
}
返回的响应代码为403,表示禁止 在执行get之前,请尝试设置用户代理。比如:
Document doc = Jsoup.connect(url).userAgent("Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:25.0) Gecko/20100101 Firefox/25.0").get();
您进行上述更改的代码对我有效。您能发布完整的异常吗?运行时是否传递了参数?如果不在命令提示符中传递任何参数,可能会导致错误。完全异常:线程主java.lang.IllegalArgumentException中的异常:位于org.jsoup.helper.Validate.isTrueValidate.java:45位于jsoup.examples.ListLinks.mainListLinks.java:21有些离题,但我不理解args.length==1在这里的作用。我正处于Java的初级阶段。@SheldonHughes向我展示您获得的堆栈跟踪。尝试删除Validate语句,看看您得到了什么。显示完整的堆栈跟踪。剪切并粘贴主线程java.lang.IllegalArgumentException:at org.jsoup.helper.Validate.isTrueValidate.java:45 at jsoup.examples.ListLinks.mainListLinks.java:21程序的参数应为:“http://news.ycombinator.com/”,不带引号和空格。抱歉。我想这就是你想要的。线程main java.lang.ArrayIndexOutOfBoundsException中的异常:0位于jsoup.examples.ListLinks.mainListLinks.java:22