import java.io.*;
import java.util.List;
import java.util.Vector;

public class Execute  {

    private final static int OUTPUT_BUFFER_SIZE = 1024;
    public static void main(String[] args) throws Exception{
    Vector vector = new Vector(1,1);
    vector.add("/bin/ls");
    System.out.println(exec(vector));
    }

    /**
     * Executes a method call.
     *
     * @param arguments a <tt>List</tt> of <tt>String</tt> objects containing
the values
     * of the arguments passed to the method.
     * @return the <tt>TemplateModel</tt> produced by the method, or null.
     * @throws Exception
     */
    public static Object exec (List arguments) throws Exception  {
        String aExecute;
        StringBuffer    aOutputBuffer = new StringBuffer();

        if( arguments.size() < 1 ) {
            throw new Exception( "Need an argument to execute" );
        }

        aExecute = (String)(arguments.get(0));

        try {
            Process exec = Runtime.getRuntime().exec( aExecute );

            // stdout from the process comes in here
            InputStream execOut = exec.getInputStream();
            InputStreamReader execReader = new InputStreamReader( execOut );


            char[] buffer = new char[ OUTPUT_BUFFER_SIZE ];
            int bytes_read = execReader.read( buffer );

            while( bytes_read > 0 ) {
                aOutputBuffer.append( buffer, 0, bytes_read );
                bytes_read = execReader.read( buffer );
            }
        }
        catch( IOException ioe ) {
            throw new Exception( ioe.getMessage() );
        }
        return aOutputBuffer.toString();
    }
}

程序执行结果为：
Execute.class
Execute.java
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