import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.StringTokenizer;


public class Test {

    public static native void hello();
        static final String LIBFILENAME = "/home/my/java/libtest.so";

    static {
        //System.loadLibrary(LIBFILENAME);

        try {
            // 獲取到java.library.path  及系統變量中Path中的內容
            String libpath = System.getProperty("java.library.path");
            if (libpath == null || libpath.length() == 0) {
                throw new RuntimeException("java.library.path is null");
            }
            //javaBinPath   jdk的bin目錄D:\Program Files\Java\jdk1.6.0_11\bin
            String javaBinPath = null;
            StringTokenizer st = new StringTokenizer(libpath,
                    System.getProperty("path.separator"));
            if (st.hasMoreElements()) {
                javaBinPath = st.nextToken();
            } else {
                throw new RuntimeException("can not split library path:"
                        + libpath);
            }
            // 把dll文件寫入到java.library.path中該dll放在ConvertWord2HM相同目錄下，這個可以是你的類名
            InputStream inputStream = Test.class.getResourceAsStream(
                    LIBFILENAME);
            final File dllFile = new File(LIBFILENAME);
            if (!dllFile.exists()) {
                FileOutputStream outputStream = new FileOutputStream(dllFile);
                byte[] array = new byte[1024];
                int bytesRead = -1;
                while ((bytesRead = inputStream.read(array)) != -1) {
                    outputStream.write(array, 0, bytesRead);
                }
                outputStream.flush();
                outputStream.close();
            }  
            // 動態加載dll
            System.load(dllFile.getPath());
            // 在虛擬機關閉的時候刪除dll 這里看著用吧
            // dllFile.deleteOnExit();
        } catch (Throwable e) {
            throw new RuntimeException("load Convert.dll error!", e);
        }

    }
    public static void main(String[] args) {
        Test.hello();
    }
}


這個文件是在目錄/home/my/java下的
javac Test.java
javah Test  //生成Test.h
然后自己寫Test.cpp
.java .h .cpp 這些文件名字一定要一樣