Java GZip解压缩

来源：互联网发布：邮箱的正则表达式php 编辑：程序博客网时间：2024/05/17 04:16
用到了apache ant.jar的tar相关类，可去http://ant.apache.org/srcdownload.cgi 下载源码
import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.net.URISyntaxException;import java.util.zip.GZIPInputStream;import org.apache.tools.tar.TarEntry;import org.apache.tools.tar.TarInputStream;/**  * @Description  GZip解压测试 */public class GZipTest { static final int BUFFER = 2048;    public static void main(String argv[]) throws IOException, URISyntaxException {    File file = new File(Thread.currentThread().getContextClassLoader().getResource("curl-7.23.1.tar.gz").toURI());    unZipFile(file, null);    }    public static void unZipFile(File file, String outputDir) {    if(outputDir == null){    outputDir = file.getParent();    }              try {              //建立grip压缩文件输入流           TarInputStream tarIn = new TarInputStream(new GZIPInputStream(new FileInputStream(file)));        TarEntry entry = null;                            while( (entry = tarIn.getNextEntry()) != null ){                                    if(entry.isDirectory()){//是目录                                            createDirectory(outputDir,entry.getName());//创建空目录                                        }else{//是文件                                            File tmpFile = new File(outputDir + "/" + entry.getName());                                            createDirectory(tmpFile.getParent() + "/",null);//创建输出目录                                            OutputStream out = null;                                            try{                                                out = new FileOutputStream(tmpFile);                                                    int length = 0;                                                    byte[] b = new byte[2048];                                                    while((length = tarIn.read(b)) != -1){                              out.write(b, 0, length);                          }                                            }catch(IOException ex){                          throw ex;                      }finally{                                                    if(out!=null)                              out.close();                      }                                        }              }          } catch (Exception ex){              System.err.println(ex.toString());          }    }            /**      * 构建目录      * @param outputDir      * @param subDir      */      public static void createDirectory(String outputDir,String subDir){          File file = new File(outputDir);                    if(subDir != null && !subDir.trim().isEmpty()){//子目录不为空                            file = new File(outputDir + "/" + subDir);          }                    if(!file.exists()){                            file.mkdirs();          }                } }