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[英]Exception in thread “main” java.lang.IllegalArgumentException: illegal component position
[英]I have an exception in thread “main” java.lang.IllegalArgumentException with jsoup
package asdf;
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;
public class asdasd {
public static void main(String[] args) throws IOException {
Validate.isTrue(args.length == 1, "usage: supply url to fetch");
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;
}
}
这是我的代码。 我正在使用jsoup,它给我这样的错误:
Exception in thread "main" java.lang.IllegalArgumentException: usage: supply url to fetch
at org.jsoup.helper.Validate.isTrue(Validate.java:45)
at asdf.asdasd.main(asdasd.java:11)
有人可以帮忙吗?
看起来Validate.isTrue
方法正在检查args.length == 1
,发现不是,则抛出IllegalArgumentException
。
因此,如果传入一个参数,则参数数组将如下所示:
arg[0] == "passed_argument"
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