如何调用一个windows上的应用程序呢？

--------------------------------------------------------------------------------
可以用Runtime，使用的例子如下：
///////////////////////////////////
Runtime runtime=Runtime.getRuntime();
Process process = Runtime.getRuntime().exec("cmd /c mysql.exe <p2hp-initiate_database.sql -uroot -pchengen");
BufferedReader bufferedReader = new BufferedReader(
        new InputStreamReader(process.getInputStream()));
String ls_1;
while ( (ls_1=bufferedReader.readLine()) != null) System.out.println(ls_1);
///////////////////////////////////
上面的程序调用mysql程序将sql文件导入到数据库服务器中~




基本上你要实现在Java的console上面是不太可能的。。有人实现了希望告诉我一下阿。(我对console和gui不是很熟的，我不是专门搞这个的)

1.写一段Java代码。

/** * Increment 1 every 1 second and keep the output in the  * same line on the Console. */package com.console;/** * Increment 1 every 1 second. * @author jiafanz */public class IncrementOneEvery1Sec{    //the right command line usage message    private final static String MESSAGE = "Usage: java <path_and_filename> \n"        + "\t(to execute the class file)\n\n"        + "where path_and_filename indicates the system file path and name.\n\n"        + "e.g. java IncrementOneEvery1Sec \r\n";        private static int value = 0;        /**     * This is a native method to invoke a c program.     * @param value the vlaue to be printed     */    public native void printConsole(int value);            /**     * Load the library.     *      * Then the runtime system later loads this shared library     * into the Java class that requires it.     *      * a static initializer.     *      * e.g.     * Solaris system converts "hello" to "libhello.so"     * Windows system converts "hello" to "hello.dll"      */    static    {        System.loadLibrary("printconsole");    }        /**     * Main method entry point.     * @param args the main method argument     */    public static void main(String[] args)    {        if (args.length != 0)        {            // user provided wrong parameters            System.err.println("wrong parameter length.");            System.out.println(MESSAGE);            System.exit(1);        }                IncrementOneEvery1Sec test = new IncrementOneEvery1Sec();        try        {            while (true)            {                Thread.sleep(1000);                test.printConsole(++value);            }        }        catch (InterruptedException ex)        {            ex.printStackTrace();        }    }}

基本上注释很全的，我就不解释了。
然后compile

2.生成 .h file
javah -jni com.console.IncrementOneEvery1Sec
(fully qualified modifier)

3.Native Method Implementation
(这里就我们的可爱的C了)

#include <jni.h>#include "com_console_IncrementOneEvery1Sec.h"#include <stdio.h>#include <stdlib.h>JNIEXPORT void JNICALL Java_com_console_IncrementOneEvery1Sec_printConsole(JNIEnv *env, jobject obj, jint value){  system("cls");  printf("%d\n", value);  return;}

注意要用到stdlib这个头文件噢，不要忘了。

4.用gcc或者cl生成dll..(我用的是CL)

cl -IC:\jdk1.5.0_06\include -IC:\jdk1.5.0_06\include\win32 -LD IncrementOneEvery1SecImp.c -Feprintconsole.dllMicrosoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.507Copyright (C) Microsoft Corporation.  All rights reserved.IncrementOneEvery1SecImp.cMicrosoft (R) Incremental Linker Version 8.00.50727.42Copyright (C) Microsoft Corporation.  All rights reserved./dll/implib:printconsole.lib/out:printconsole.dllIncrementOneEvery1SecImp.obj   Creating library printconsole.lib and object printconsole.exp


5.好拉，下面就可以用了。
(不要在Eclipse里面运行，好象有点问题的)
java -Djava.library.path=<yourDllFolder> <YourClass>

e.g.
java -Djava.library.path=C:\cjsdn\cjsdn\clib\cjsdn com.console.IncrementOneEvery1Sec
(我这里的cmd)

能看出我是用心写的。。斑竹加分阿。

嘉帆