爲什麼當代碼編譯OK和classpath設置

爲什麼下面的代碼提供了錯誤爲什麼當代碼編譯OK和classpath設置

C:\temp>java Test -cp commons-codec-1.9.jar auth string: xxx Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/co dec/binary/Base64 at Test.main(Test.java:22) Caused by: java.lang.ClassNotFoundException: org.apache.commons.codec.binary.Bas e64 at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 1 more

代碼中沒有找到的base64類

import org.apache.commons.codec.binary.Base64; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLConnection; 


public class Test { 

    public static void main(String[] args) { 

     try { 
      String webPage = "xx"; 
      String name = "xxx"; 
      String password = "xx"; 

      String authString = name + ":" + password; 
      System.out.println("auth string: " + authString); 
      byte[] authEncBytes = Base64.encodeBase64(authString.getBytes()); 
      String authStringEnc = new String(authEncBytes); 
      System.out.println("Base64 encoded auth string: " + authStringEnc); 

      URL url = new URL(webPage); 
      URLConnection urlConnection = url.openConnection(); 
      urlConnection.setRequestProperty("Authorization", "Basic " + authStringEnc); 
      InputStream is = urlConnection.getInputStream(); 
      InputStreamReader isr = new InputStreamReader(is); 

      int numCharsRead; 
      char[] charArray = new char[1024]; 
      StringBuffer sb = new StringBuffer(); 
      while ((numCharsRead = isr.read(charArray)) > 0) { 
       sb.append(charArray, 0, numCharsRead); 
      } 
      String result = sb.toString(); 

      System.out.println("*** BEGIN ***"); 
      System.out.println(result); 
      System.out.println("*** END ***"); 
     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

}

來源

2014-09-22 Tom

試試在類名前放置cp標誌的命令：

java -cp commons-codec-1.9.jar Test

這是從java命令：

Usage: java [-options] class [args...]

(to execute a class)

來源

2014-09-22 09:17:44 manouti

爲什麼當代碼編譯OK和classpath設置

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