Java NoClassDefFoundError

这里我正在下载一个网页源代码，然后将其存储在文本文件中。然后我读取该文件并将其与正则表达式匹配以搜索特定的字符串。Java NoClassDefFoundError

没有编译器错误。

Exception in thread "main" java.lang.NoClassDefFoundError: java/lang/CharSequence

有人可以告诉我我在哪里错了。

java version "1.3.1_01" 
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_01) 
Java HotSpot(TM) Client VM (build 1.3.1_01, mixed mode)

import java.io.*; 
import java.net.*; 
import java.lang.*; 
import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
public class WebDownload 
{ 
    public void getWebsite() 
    { 
    try{ 
    URL url=new URL("www.gmail.com");// any URL can be given 
    URLConnection urlc=url.openConnection(); 
    BufferedInputStream buffer=new BufferedInputStream(urlc.getInputStream()); 
    StringBuffer builder=new StringBuffer(); 
    int byteRead; 
    FileOutputStream fout; 
    StringBuffer contentBuf = new StringBuffer(); 

    while((byteRead=buffer.read()) !=-1) 
    { 

     builder.append((char)byteRead); 



     fout = new FileOutputStream ("myfile3.txt"); 


      new PrintStream(fout).println (builder.toString()); 

      fout.close(); 


    } 
    BufferedReader in = new BufferedReader(new FileReader("myfile3.txt")); 
String buf = null; 
while ((buf = in.readLine()) != null) { 
contentBuf.append(buf);contentBuf.append("\n"); 
} 
in.close(); 
Pattern p = Pattern.compile("<div class=\"summarycount\">([^<]*)</div>"); 
Matcher matcher = p.matcher(contentBuf); 
if(matcher.find()) 
    { 
    System.out.println(matcher.group(1)); 
    } 
    else 

    System.out.println("could not find"); 
    } 
    catch(MalformedURLException ex) { 
    ex.printStackTrace(); 
    } 
    catch(IOException ex){ 
     ex.printStackTrace(); 
    } 



    } 
    public static void main(String [] args) 
    { 
    WebDownload web=new WebDownload(); 
    web.getWebsite(); 
    } 
}

来源

2010-03-13 giri

声音像运行时的版本比你编译的版本要低。 – bzlm 2010-03-13 19:02:29