【JAVA】【工具类】运行时读取jar包内文件复制到文件夹下

import lombok.SneakyThrows;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.util.AbstractMap;
import java.util.List;
import java.util.Map;
import java.util.jar.JarFile;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.zip.ZipEntry;
import java.net.URI;
/**

读取复制 jar 包文件内容工具类
/
public class readJarUtils {
private static final Logger logger = LoggerFactory.getLogger(readJarUtils.class);
public void test(){
URI uri = null;
try {
uri = readJarUtils.class.getProtectionDomain().getCodeSource().getLocation().toURI();
} catch (URISyntaxException e) {
e.printStackTrace();
}
String tempPath = "/deployments";
String sourceDir = "krb"; // 资源文件夹
if (uri.toString().startsWith("file")) {
// IDEA 运行时，进行资源复制
copyLocalResourcesFileToTemp(sourceDir + "/", "", tempPath + "/" + sourceDir);
} else {
// 获取 jar 包所在路径
String jarPath = uri.toString();
uri = URI.create(jarPath.substring(jarPath.indexOf("file:"),jarPath.indexOf(".jar") + 4));
// 打成 jar 包后，进行资源复制
readJarUtils.copyJarResourcesFileToTemp(uri, tempPath, "BOOT-INF/classes/" + sourceDir);
}

}
/**

复制本地资源文件到指定目录

@param fileRoot 需要复制的资源目录文件夹

@param regExpStr 资源文件匹配正则，* 表示匹配所有

@param tempParent 保存地址
/
public static void copyLocalResourcesFileToTemp(String fileRoot, String regExpStr, String tempParent) {
try {
ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
Resource[] resources = resolver.getResources(fileRoot + regExpStr);
for (Resource resource : resources) {
File newFile = new File(tempParent, resource.getFilename());
if (newFile.exists()) {
newFile.delete();
}
InputStream stream = null;
try {
stream = resource.getInputStream();
} catch (Exception e) {
// 如果 resource 为文件夹时，会报异常，这里直接忽略这个异常
}
if (stream == null) {
newFile.mkdirs();
copyLocalResourcesFileToTemp(fileRoot + resource.getFilename() + "/", regExpStr, tempParent + "/" + resource.getFilename());
} else {
if (!newFile.getParentFile().exists()) {
newFile.getParentFile().mkdirs();
}
org.apache.commons.io.FileUtils.copyInputStreamToFile(stream, newFile);
}
}
} catch (Exception e) {
logger.error("failed to copy local source template", e);
}
}
/*

复制 jar 包中的资源文件到指定目录

@param path jar 包所在路径

@param tempPath 保存目录

@param filePrefix 需要进行复制的资源文件目录：以 BOOT-INF/classes/ 开头
*/
public static void copyJarResourcesFileToTemp(URI path, String tempPath, String filePrefix) {
try {
List<Map.Entry<ZipEntry, InputStream>> collect =
readJarFile(new JarFile(path.getPath()), filePrefix).collect(Collectors.toList());
for (Map.Entry<ZipEntry, InputStream> entry : collect) {
// 文件相对路径
String key = entry.getKey().getName();
// 文件流
InputStream stream = entry.getValue();
File newFile = new File(tempPath + key.replaceAll("BOOT-INF/classes", ""));
if (!newFile.getParentFile().exists()) {
newFile.getParentFile().mkdirs();
}
org.apache.commons.io.FileUtils.copyInputStreamToFile(stream, newFile);
}
} catch (IOException e) {
logger.error("failed to copy jar source template", e);
}
}
@SneakyThrows
public static Stream<Map.Entry<ZipEntry, InputStream>> readJarFile(JarFile jarFile, String prefix) {
Stream<Map.Entry<ZipEntry, InputStream>> readingStream =
jarFile.stream().filter(entry -> !entry.isDirectory() && entry.getName().startsWith(prefix))
.map(entry -> {
try {
return new AbstractMap.SimpleEntry<>(entry, jarFile.getInputStream(entry));
} catch (IOException e) {
return new AbstractMap.SimpleEntry<>(entry, null);
}
});
return readingStream.onClose(() -> {
try {
jarFile.close();
} catch (IOException e) {
logger.error("failed to close jarFile", e);
}
});
}
}