[英]how can i fix this error “Error: Could not find or load main class” in eclipse?
[英]Getting a could not find or load main class error, can anyone help me fix it? I'm new to java
我正在嘗試編寫一個程序來解析網頁中的鏈接和其他媒體,並且遇到一個錯誤,當我嘗試在編譯后運行代碼時,我不知道該如何處理彈出窗口。
package org.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;
import java.io.*;
public class ListLinks{
public static void main(String[] args) throws IOException {
Validate.isTrue(args.length == 1, "usage: supply url to fetch");
String url = args[0];
File file = new File("save.txt");
file.createNewFile();
FileWriter writer = new FileWriter(file);
print(writer,"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(writer,"\nMedia: (%d)", media.size());
for (Element src : media) {
if (src.tagName().equals("img"))
print(writer," * %s: <%s> %sx%s (%s)",
src.tagName(), src.attr("abs:src"), src.attr("width"), src.attr("height"),
trim(src.attr("alt"), 20));
else
print(writer," * %s: <%s>", src.tagName(), src.attr("abs:src"));
}
print(writer,"\nImports: (%d)", imports.size());
for (Element link : imports) {
print(writer," * %s <%s> (%s)", link.tagName(),link.attr("abs:href"), link.attr("rel"));
}
print(writer,"\nLinks: (%d)", links.size());
for (Element link : links) {
print(writer," * a: <%s> (%s)", link.attr("abs:href"), trim(link.text(), 35));
}
}
private static void print(FileWriter writer,String msg, Object... args) {
try
{
writer.write(String.format(msg,args));
}
catch(IOException e){
System.out.println("something went wrong");
}
}
private static String trim(String s, int width) {
if (s.length() > width)
return s.substring(0, width-1) + ".";
else
return s;
}
}
我試圖從命令行運行此命令,只是從網頁中解析代碼。
我通過編寫以下程序來編譯程序:
java -cp .;jsoup-1.9.2.jar ListLinks.java
然后我試圖通過編寫來運行它:
java -cp .jsoup-1.9.2.jar ListLinks
這給了我錯誤:
Error:could not find or load main class ListLinks
我該如何解決?
您應該在類名前面加上org.jsoup.examples
包:
java -cp .jsoup-1.9.2.jar org.jsoup.examples.ListLinks
沒有它,java會在空包(當前目錄)中尋找此類,並且找不到它。
提供軟件包時,java將在org / jsoup / examples目錄中查找此類,您可以看到實際上該類文件( ListLinks.class
)不在當前目錄中。
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