[JAVA] 자바 jar 파일 압축해제 소스코드

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;

public class JarExtractUtil {

    public static void extractJar(String jarFilePath, String destinationDirPath) throws NullPointerException, Exception {
        File f = null;
        JarFile jarFile = null;
        
        try {

            f = new File(jarFilePath);
            jarFile = new JarFile(f);
            File destDir = new File(destinationDirPath);
            if (!destDir.exists()) {
                destDir.mkdirs();
            }
    
            Enumeration entries = jarFile.entries();
            while (entries.hasMoreElements()) {
                ZipEntry entry = (ZipEntry) entries.nextElement();
                if (entry.isDirectory()) {
                    File newDir = new File(destDir, entry.getName());
                    if (entry.getName().toUpperCase().indexOf(“META-INF”) > -1) {
                        continue;
                    }
                    
                    newDir.mkdirs();
                    
                } else {
                    if (entry.getName().toUpperCase().indexOf(“META-INF”) > -1) {
                        continue;
                    }
    
                    File targetFileObj = new File(destDir, entry.getName());
                    
                    InputStream input = null;
                    FileOutputStream fileOutput = null;
                    BufferedOutputStream buffOutput = null;
    
                    try {
                        input = jarFile.getInputStream(entry);
                        fileOutput = new FileOutputStream(targetFileObj);
                        buffOutput = new BufferedOutputStream(fileOutput);
                        byte[] buf = new byte[4096];
                        int read = -1;
                        while ((read = input.read(buf)) != -1) {
                            buffOutput.write(buf, 0, read);
                        }
                        buffOutput.flush();
                        buffOutput.close();
    
                        fileOutput.close();
                        input.close();
    
                    } catch (IOException e) {
                        throw e;
                    } catch (Exception e) {
                        throw e;
    
                    } finally {
                        try {
                            if (buffOutput != null) {
                                buffOutput.close();
                            }
                        } catch (IOException e) {
                        } catch (Exception e) {
                        } finally {
                            buffOutput = null;
                        }
    
                        try {
                            if (fileOutput != null) {
                                fileOutput.close();
                            }
                        } catch (IOException e) {
                        } catch (Exception e) {
                        } finally {
                            fileOutput = null;
                        }
    
                        try {
                            if (input != null) {
                                input.close();
                            }
                        } catch (IOException e) {
                        } catch (Exception e) {
                        } finally {
                            input = null;
                        }
                    }
                }
            }
        } catch (IOException e) {
            throw e;
        } catch (Exception e) {
            throw e;
        } finally {
            try {
                if (jarFile != null) {
                    jarFile.close();
                }
            } catch (IOException e) {
            } catch (Exception e) {
            } finally {
                jarFile = null;
            }
        }
    }
}