1、如果引用了本地jar包或者so库,.dll库等文件,需要在打包的时候都加载进去。
如下图:本地正常,打包的时候谨记,需要打包进去,怎么验证是否打包成功呢?我们继续看打包后的图片。
把jar包后缀改成zip 格式的,打开压缩文件,框内路径,查看libs下的包是否在里面可以找到。如果可以找到就是打包进去了,找不到的话,就是没打包进去,稍后我们再说怎么打包进去。
动态库也打包进去了。
动态库打包进去方式如下:
import org.opencv.core.Core;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @author Arthur.yu
* @date 2021/12/8 0008
*/
@Configuration
public class NativeConfig {
static {
}
@Bean
public void loadLib() {
//根据操作系统判断,如果是linux系统则加载c++方法库
String systemType = System.getProperty("os.name");
String ext = (systemType.toLowerCase().indexOf("win") != -1) ? ".dll" : ".so";
// if (ext.equals(".so")) {
try {
NativeLoader.loader("native");
} catch (Exception e) {
System.out.println("加载so库失败");
}
// }else {
// System.out.println("load --- dll === sucess");
// }
System.out.println("loaded");
}
}
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 Arthur.yu
* @date 2021/12/8 0008
*/
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.out.println("path :" + tempFile.getPath());
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!!!");
}
}
}
运行的时候,会在jar包所在目录生成一个native文件夹,里面放的就是动态库
下面我们看一下本地jar包怎么打进去:
1、jar包存放路径
2、pom 文件引用一下
<dependency>
<groupId>org.opencv</groupId>
<artifactId>opencv</artifactId>
<version>0.0.1</version>
<scope>system</scope>
<systemPath>${project.basedir}/libs/opencv-343.jar</systemPath>
</dependency>
3、pom打包配置
<build>
<plugins>
<!--参考文章:;
<plugin>
<!-- 指定maven编译的jdk版本,如果不指定,maven3默认用jdk 1.5 maven2默认用jdk1.3 -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<!-- 源代码使用的JDK版本 -->
<source>1.8</source>
<!-- 需要生成的目标class文件的编译版本 -->
<target>1.8</target>
<!-- 字符集编码 -->
<encoding>UTF-8</encoding>
<!-- 跳过测试 -->
<skip>true</skip>
<compilerArguments>
<extdirs>${project.basedir}/libs</extdirs>
</compilerArguments>
</configuration>
</plugin>
</plugins>
<resources>
<resource>
<directory>${project.basedir}/libs/</directory>
<targetPath>BOOT-INF\lib</targetPath>
<includes>
<include>**/*.jar</include>
</includes>
</resource>
<resource>
<directory>${project.basedir}/libs</directory>
</resource>
</resources>
</build>
好了。动态库跟jar包都打包进去了。