踩过了很多的坑，查了很多资料，在此记录一下，以SpringBoot项目为基础。
Maven加入JNA依赖
<!-- JNA start -->
<dependency>
<groupId>com.sun.jna</groupId>
<artifactId>jna</artifactId>
</dependency>
<!-- JNA end -->
动态链接库放在classpath下的natives文件夹下
主入口中的代码
@ServletComponentScan
@SpringBootApplication
@ComponentScan("com.yunzhitx.sdy")
@MapperScan(basePackages = "com.yunzhitx.sdy.core.**.infra")
public class TaskApplication {
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
} public static void main(String[] args) {
//加载动态链接库，注意和SpringBoot的启动
String systemType = System.getProperty("os.name");
if (systemType.toLowerCase().indexOf("win") != -1)
loadNative("dhnetsdk");
else
loadNative("libdhnetsdk");
SpringApplication.run(TaskApplication.class);
} private synchronized static void loadNative(String nativeName) { String systemType = System.getProperty("os.name");
String fileExt = (systemType.toLowerCase().indexOf("win") != -1) ? ".dll" : ".so"; // String sysUserTempDir = System.getProperty("java.io.tmpdir");
/*String javaLibraryPath = System.getProperty("java.library.path");
String sysUserTempDir = "" ;
if(systemType.toLowerCase().indexOf("win") != -1) {
String[] dirs = javaLibraryPath.split(";");//分号
sysUserTempDir = dirs[0];
}else {
String[] dirs = javaLibraryPath.split(":"); //冒号
sysUserTempDir = dirs[0];
}*/ File path = new File(".");
//将所有动态链接库dll/so文件都放在一个临时文件夹下，然后进行加载
//这是应为项目为可执行jar文件的时候不能很方便的扫描里面文件
//此目录放置在与项目同目录下的natives文件夹下
String sysUserTempDir = path.getAbsoluteFile().getParent() + File.separator + "natives"; System.out.println("------>>native lib临时存放目录 : " + sysUserTempDir);
String fileName = nativeName + fileExt; InputStream in = null;
BufferedInputStream reader = null;
FileOutputStream writer = null; File tempFile = new File(sysUserTempDir + File.separator + fileName);
if(!tempFile.getParentFile().exists())
tempFile.getParentFile().mkdirs() ;
if (tempFile.exists()) {
tempFile.delete();
}
try {
//读取文件形成输入流
in = TaskApplication.class.getResourceAsStream("/native/" + fileName);
if (in == null)
in = TaskApplication.class.getResourceAsStream("native/" + fileName);
TaskApplication.class.getResource(fileName);
reader = new BufferedInputStream(in);
writer = new FileOutputStream(tempFile); byte[] buffer = new byte[1024]; while (reader.read(buffer) > 0) {
writer.write(buffer);
buffer = new byte[1024];
} } catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (in != null)
in.close();
if (writer != null)
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
System.load(tempFile.getPath());
System.out.println("------>> 加载native文件 :" + tempFile + "成功!!");
} }
主入口函数的代码主要是进行加载操作，当然也可以在需要使用到的地方在进行加载。
加载的时候进行了如下操作，1、将所有动态链接库dll/so文件都放在一个临时文件夹下。2、读取临时文件IO流进行加载。
这是应为项目为可执行jar文件的时候不能很方便的扫描里面文件
此目录代码放置在与项目同目录下的natives文件夹下。
在通过编写好的接口类进行实例化操作：
NetSDKLib monitorNetSdk = (NetSDKLib) Native.loadLibrary("dhnetsdk", NetSDKLib.class);Linux系统下，需要将放置dll/so文件的文件夹加入到环境变量中，否则依然会提示找不到文件的错误：
export LD_LIBRARY_PATH=/home/sdy_task/natives
但是这种方式是临时性的，一旦重启就将失效，所有建议写入配置文件中：
修改/etc/profile，添加如下代码
LD_LIBRARY_PATH=/home/sdy_task/natives
export LD_LIBRARY_PATH
升级版
package org.yoki.edu.image.utils; import java.io.*;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile; /**
* @author Sky$
* @Description: TODO
* @date 2018/2/8$ 17:55$
*/
public class NativeLoader { /**
* 加载项目下的native文件，DLL或SO
*
* @param dirPath 需要扫描的文件路径，项目下的相对路径
* @throws IOException
* @throws ClassNotFoundException
*/
public synchronized static void loader(String dirPath) throws IOException, ClassNotFoundException {
Enumeration<URL> dir = Thread.currentThread().getContextClassLoader().getResources(dirPath);
// 获取操作系统类型
String systemType = System.getProperty("os.name");
String systemArch = System.getProperty("os.arch");
// 获取动态链接库后缀名
String ext = (systemType.toLowerCase().indexOf("win") != -1) ? ".dll" : ".so";
while (dir.hasMoreElements()) {
URL url = dir.nextElement();
String protocol = url.getProtocol();
if ("jar".equals(protocol)) {
JarURLConnection jarURLConnection = (JarURLConnection) url.openConnection();
JarFile jarFile = jarURLConnection.getJarFile();
// 遍历Jar包
Enumeration<JarEntry> entries = jarFile.entries();
while (entries.hasMoreElements()) {
JarEntry jarEntry = entries.nextElement();
String entityName = jarEntry.getName();
if (jarEntry.isDirectory() || !entityName.startsWith(dirPath)) {
continue;
}
if (entityName.endsWith(ext)) {
loadJarNative(jarEntry);
}
}
} else if ("file".equals(protocol)) {
File file = new File(url.getPath());
loadFileNative(file, ext);
} }
} private static void loadFileNative(File file, String ext) {
if (null == file) {
return;
}
if (file.isDirectory()) {
File[] files = file.listFiles();
if (null != files) {
for (File f : files) {
loadFileNative(f, ext);
}
}
}
if (file.canRead() && file.getName().endsWith(ext)) {
try {
System.load(file.getPath());
System.out.println("加载native文件 :" + file + "成功!!");
} catch (UnsatisfiedLinkError e) {
System.out.println("加载native文件 :" + file + "失败!!请确认操作系统是X86还是X64!!!");
}
}
} /**
* @throws IOException
* @throws ClassNotFoundException
* @Title: scanJ
* @Description 扫描Jar包下所有class
*/
/**
* 创建动态链接库缓存文件，然后加载资源文件
*
* @param jarEntry
* @throws IOException
* @throws ClassNotFoundException
*/
private static void loadJarNative(JarEntry jarEntry) throws IOException, ClassNotFoundException { File path = new File(".");
//将所有动态链接库dll/so文件都放在一个临时文件夹下，然后进行加载
//这是应为项目为可执行jar文件的时候不能很方便的扫描里面文件
//此目录放置在与项目同目录下的natives文件夹下
String rootOutputPath = path.getAbsoluteFile().getParent() + File.separator;
String entityName = jarEntry.getName();
String fileName = entityName.substring(entityName.lastIndexOf("/") + 1);
System.out.println(entityName);
System.out.println(fileName);
File tempFile = new File(rootOutputPath + File.separator + entityName);
// 如果缓存文件路径不存在，则创建路径
if (!tempFile.getParentFile().exists()) {
tempFile.getParentFile().mkdirs();
}
// 如果缓存文件存在，则删除
if (tempFile.exists()) {
tempFile.delete();
}
InputStream in = null;
BufferedInputStream reader = null;
FileOutputStream writer = null;
try {
//读取文件形成输入流
in = NativeLoader.class.getResourceAsStream(entityName);
if (in == null) {
in = NativeLoader.class.getResourceAsStream("/" + entityName);
if (null == in) {
return;
}
}
NativeLoader.class.getResource(fileName);
reader = new BufferedInputStream(in);
writer = new FileOutputStream(tempFile);
byte[] buffer = new byte[1024]; while (reader.read(buffer) > 0) {
writer.write(buffer);
buffer = new byte[1024];
} } catch (IOException e) {
e.printStackTrace();
}
try {
if (in != null) {
in.close();
}
if (writer != null) {
writer.close();
}
} catch (IOException e) {
e.printStackTrace();
}
try {
System.load(tempFile.getPath());
System.out.println("加载native文件 :" + tempFile + "成功!!");
} catch (UnsatisfiedLinkError e) {
System.out.println("加载native文件 :" + tempFile + "失败!!请确认操作系统是X86还是X64!!!");
} } }