JAVA动态加载dll任意路径加载dll

向右看齐 2022-08-24 00:57 547阅读 0赞

package com.ctl.test;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.InputStream;
    import java.util.StringTokenizer;
    
    public class SayHellotoCPP {
    	//LIBFILENAME dll文件的路径
    	static final String LIBFILENAME = "D:\\inca_workspace\\JNI\\bin\\HelloEnd.dll";// dll 文件
    	static {
    		try {
    			// 获取到java.library.path  及系统变量中Path中的内容
    			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目录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文件写入到java.library.path中该dll放在ConvertWord2HM相同目录下，这个可以是你的类名
    			InputStream inputStream = SayHellotoCPP.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();
    			}
    			// 动态加载dll
    			System.load(dllFile.getPath());
    			// 在虚拟机关闭的时候删除dll
    			dllFile.deleteOnExit();
    		} catch (Throwable e) {
    			throw new RuntimeException("load Convert.dll error!", e);
    		}
    
    	}
    
    
    	public SayHellotoCPP() {
    	}
    
    	public native void sayHello(String name);
    
    	public static void main(String[] args) {		
    		SayHellotoCPP shp = new SayHellotoCPP();
    		shp.sayHello("World");
    	}
    }