将jar内的文件复制到jar包外的同级目录下

ゝ一纸荒年。 2022-05-19 03:06 574阅读 0赞

import java.io.ByteArrayInputStream;
    import java.io.File;
    import java.io.IOException;
    import java.io.InputStream;
    import java.net.URL;
    import java.nio.file.Files;
    import java.nio.file.Path;
    import java.nio.file.Paths;
    
    import org.apache.commons.io.IOUtils;
    import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
    
    /** * 将jar内的文件复制到jar包外的同级目录下 * */
    public class FileCopyUtils { 
    
        private static InputStream getResource(String location) throws IOException {
            PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
            InputStream in = resolver.getResource(location).getInputStream();
            byte[] byteArray = IOUtils.toByteArray(in);
            in.close();
            return new ByteArrayInputStream(byteArray);
        }
    
        /** * 获取项目所在文件夹的绝对路径 * @return */
        private static String getCurrentDirPath() {
            URL url = FileCopyUtils.class.getProtectionDomain().getCodeSource().getLocation();
            String path = url.getPath();
            if(path.startsWith("file:")) {
                path = path.replace("file:", "");
            }
            if(path.contains(".jar!/")) {
                path = path.substring(0, path.indexOf(".jar!/")+4);
            }
    
            File file = new File(path);
            path = file.getParentFile().getAbsolutePath(); 
            return path;
        }
    
        private static Path getDistFile(String path) throws IOException {
            String currentRealPath = getCurrentDirPath();
            Path dist = Paths.get(currentRealPath + File.separator + path);
            Path parent = dist.getParent();
            if(parent != null) {
                Files.createDirectories(parent);
            }
            Files.deleteIfExists(dist);
            return dist;
        }
    
        /** * 复制classpath下的文件到jar包的同级目录下 * @param location 相对路径文件,例如kafka/kafka_client_jaas.conf * @return * @throws IOException */
        public static String copy(String location) throws IOException {
            InputStream in = getResource("classpath:"+location);
            Path dist = getDistFile(location);
            Files.copy(in, dist);
            in.close();
            return dist.toAbsolutePath().toString();
        }
    
    }