java程序实现对文件的压缩和解压

叁歲伎倆 2022-09-19 01:54 163阅读 0赞

前提是要导入ant.jar包，可以到官网上下载

下面贴代码

/*
     * 实现文件压缩和解压的功能
     */
    import java.io.*;   
    import java.util.*;   
    import org.apache.tools.zip.*;   
      
    public class CompressFile {   
        private static CompressFile instance = new CompressFile();   
        private static final int BUFFEREDSIZE = 1024;    
        private CompressFile() {   
        }   
           
        public static CompressFile getInstance() {   
            return instance;   
        }   
      
        public synchronized void zip(String inputFilename, String zipFilename){   
            try {
            	//调用zip的方法
    			zip(new File(inputFilename), zipFilename);
    		} catch (Exception e) {
    			e.printStackTrace();
    		}   
        }   
           
        public synchronized void zip(File inputFile, String zipFilename){   
            ZipOutputStream out = null;
            try {
            	out = new ZipOutputStream(new FileOutputStream(zipFilename));
                zip(inputFile, out, "");   
            } catch (Exception e) {   
                e.printStackTrace();   
            } finally {   
                try {
                	//关闭流,后打开的先关闭
                	if(out != null)
                	{
                		out.close();
                	}	
    			} catch (Exception e) {
    				e.printStackTrace();
    			}   
            }   
        }   
      
        private synchronized void zip(File inputFile, ZipOutputStream out, String base){
        	//如果文件是目录的话
            if (inputFile.isDirectory()) {   
            	//listFiles能够获取当前文件夹下的所有文件和文件夹
                File[] inputFiles = inputFile.listFiles();   
                try {
    				out.putNextEntry(new ZipEntry(base + "/"));
    				base = base.length() == 0 ? "" : base + "/";   
    		        for (int i = 0; i < inputFiles.length; i++) 
    		        {
    		        	zip(inputFiles[i], out, base + inputFiles[i].getName());
    		        }
    			} catch (Exception e) {
    				e.printStackTrace();
    			}   
                  
            }else {   
                if (base.length() > 0) {   
                    try {
    					out.putNextEntry(new ZipEntry(base));
    				} catch (IOException e) {
    					e.printStackTrace();
    				}   
                } else {   
                    try {
    					out.putNextEntry(new ZipEntry(inputFile.getName()));
    				} catch (IOException e) {
    					e.printStackTrace();
    				}   
                }   
      
                FileInputStream in = null;
    			try {
    				in = new FileInputStream(inputFile);
    				int c;
    	            //设置一个缓冲数组
    	            byte[] by = new byte[BUFFEREDSIZE];   
    	            while ((c = in.read(by)) != -1) 
    	            {   
    	               out.write(by, 0, c);   
    	            }   
    			} catch (Exception e) {
    				e.printStackTrace();
    			} finally {
                	//关闭文件输入流
                    try {
                    	if(in != null)
                    	{
                    		in.close();
                    	}
    				} catch (IOException e) {
    					e.printStackTrace();
    				}   
                }   
            }   
        }   
        //解压的方法
        public synchronized void unzip(String zipFilename, String outputDirectory){   
            File outFile = new File(outputDirectory); 
            //如果输出文件不存在，创建输出文件以及其目录
            if (!outFile.exists()) {   
                outFile.mkdirs();   
            }   
      
            ZipFile zipFile = null;
    		try {
    			zipFile = new ZipFile(zipFilename);
    		} catch (Exception e) {
    			e.printStackTrace();
    		}   
            Enumeration en = zipFile.getEntries();   
            ZipEntry zipEntry = null;   
            while (en.hasMoreElements()) {   
                zipEntry = (ZipEntry) en.nextElement();   
                if (zipEntry.isDirectory()) {   
                    // mkdir directory   
                    String dirName = zipEntry.getName();   
                    dirName = dirName.substring(0, dirName.length() - 1);   
                    File f = new File(outFile.getPath() + File.separator + dirName);   
                    f.mkdirs();   
                } else {   
                    // unzip file   
                    File f = new File(outFile.getPath() + File.separator + zipEntry.getName());   
                    InputStream in = null;
                    FileOutputStream out = null;
    				try {
    					f.createNewFile();
    					in = zipFile.getInputStream(zipEntry);
    					out = new FileOutputStream(f);
    					int c;   
    	                byte[] by = new byte[BUFFEREDSIZE];   
    	                while ((c = in.read(by)) != -1) 
    	                {
    	                	out.write(by, 0, c);
    	                } 
    				} catch (Exception e) {
    					e.printStackTrace();
    				} finally{
    					try {
    						if(out != null)
    						{
    							out.close();
    						}
    						if(in != null)
    						{
    							in.close();
    						}
    					} catch (Exception e) {
    						// TODO Auto-generated catch block
    						e.printStackTrace();
    					}
                           
                    }   
                }   
            }   
        }   
      
      
           
        public static void main(String[] args) {      
            CompressFile bean = new CompressFile();      
            try {      
                bean.zip("F:/语音文件", "F:/语音文件.zip");      
                System.out.println("压缩完成");
                bean.unzip("F:/语音文件.zip", "F:/out/语音文件");
                System.out.println("解压完成");
            } catch (Exception e) {      
                e.printStackTrace();      
            }      
        }    
    }