[中学教育]java压缩解压缩zip格式文件

[中学教育]java压缩解压缩zip格式文件 java压缩解压缩zip格式文件 java压缩/解压缩zip格式文件 因为项目要用到压缩、解压缩zip格式压缩包，只好自己封装一个，对于网上流行的中文乱码的问题，本文的解决方法是用apache的包代替jdk里的。基本上还是比较好用的。 废话少说，直接上代码。 复制代码 1package com.resoft.util; 2 3import java.io.BufferedOutputStream; 4import java.io.File; 5import java.io.FileInputStream; 6import java.io.FileNotFoundException; 7import java.io.FileOutputStream; 8import java.io.IOException; 9import java.io.InputStream; 10import java.io.OutputStream; 11import java.util.Enumeration; 12 13import org.apache.tools.zip.ZipEntry; 14import org.apache.tools.zip.ZipFile; 15import org.apache.tools.zip.ZipOutputStream; 16 17/** 18 * 压缩/解压缩zip包处理类 19 * 20 * @author yayagepei 21 * @date 2008-8-25 22 */ 23public class ZipUtil { 24 25 /** 26 * 压缩 27 * 28 * @param zipFileName 29 * 压缩产生的zip包文件名--带路径,如果为null或空则默认按文件名生产压缩文件名 30 * @param relativePath 31 * 相对路径，默认为空 32 * @param directory 33 * 文件或目录的绝对路径 34 * @throws FileNotFoundException 35 * @throws IOException 36 * @author yayagepei 37 * @date 2008-8-26 38 */ 39 public static void zip(String zipFileName, String relativePath, 40 String directory) throws FileNotFoundException, IOException { 41 String fileName = zipFileName; 42 if (fileName == null || fileName.trim().equals("")) { 43 File temp = new File(directory); 44 if (temp.isDirectory()) { 45 fileName = directory + ".zip"; 46 } else { 47 if (directory.indexOf(".") > 0) { 48 fileName = directory.substring(0, directory 49 .lastIndexOf(".")) 50 + "zip"; 51 } else { 52 fileName = directory + ".zip"; 53 } 54 } 55 } 56 ZipOutputStream zos = new ZipOutputStream( 57 new FileOutputStream(fileName)); 58 try { 59 zip(zos, relativePath, directory); 60 } catch (IOException ex) { 61 throw ex; 62 } finally { 63 if (null != zos) { 64 zos.close(); 65 } 66 } 67 } 68 69 /** 70 * 压缩 71 * 72 * @param zos 73 * 压缩输出流 74 * @param relativePath 75 * 相对路径 76 * @param absolutPath 77 * 文件或文件夹绝对路径 78 * @throws IOException 79 * @author yayagepei 80 * @date 2008-8-26 81 */ 82 private static void zip(ZipOutputStream zos, String relativePath, 83 String absolutPath) throws IOException { 84 File file = new File(absolutPath); 85 if (file.isDirectory()) { 86 File[] files = file.listFiles(); 87 for (int i = 0; i < files.length; i++) { 88 File tempFile = files[i]; 89 if (tempFile.isDirectory()) { 90 String newRelativePath = relativePath + tempFile.getName() 91 + File.separator; 92 createZipNode(zos, newRelativePath); 93 zip(zos, newRelativePath, tempFile.getPath()); 94 } else { 95 zipFile(zos, tempFile, relativePath); 96 } 97 } 98 } else { 99 zipFile(zos, file, relativePath); 100 } 101 } 102 103 /** 104 * 压缩文件 105 * 106 * @param zos 107 * 压缩输出流 108 * @param file 109 * 文件对象 110 * @param relativePath 111 * 相对路径 112 * @throws IOException 113 * @author yayagepei 114 * @date 2008-8-26 115 */ 116 private static void zipFile(ZipOutputStream zos, File file, 117 String relativePath) throws IOException { 118 ZipEntry entry = new ZipEntry(relativePath + file.getName()); 119 zos.putNextEntry(entry); 120 InputStream is = null; 121 try { 122 is = new FileInputStream(file); 123 int BUFFERSIZE = 2 << 10; 124 int length = 0; 125 byte[] buffer = new byte[BUFFERSIZE]; 126 while ((length = is.read(buffer, 0, BUFFERSIZE)) >= 0) { 127 zos.write(buffer, 0, length); 128 } 129 zos.flush(); 130 zos.closeEntry(); 131 } catch (IOException ex) { 132 throw ex; 133 } finally { 134 if (null != is) { 135 is.close(); 136 } 137 } 138 } 139 140 /** 141 * 创建目录 142 * 143 * @param zos 144 * zip输出流 145 * @param relativePath 146 * 相对路径 147 * @throws IOException 148 * @author yayagepei 149 * @date 2008-8-26 150 */ 151 private static void createZipNode(ZipOutputStream zos, String relativePath) 152 throws IOException { 153 ZipEntry zipEntry = new ZipEntry(relativePath); 154 zos.putNextEntry(zipEntry); 155 zos.closeEntry(); 156 } 157 158 /** 159 * 解压缩zip包 160 * 161 * @param zipFilePath 162 * zip文件路径 163 * @param targetPath 164 * 解压缩到的位置，如果为null或空字符串则默认解压缩到跟zip包同目录跟zip包同名的文件夹下 165 * @throws IOException 166 * @author yayagepei 167 * @date 2008-9-28 168 */ 169 public static void unzip(String zipFilePath, String targetPath) 170 throws IOException { 171 OutputStream os = null; 172 InputStream is = null; 173 ZipFile zipFile = null; 174 try { 175 zipFile = new ZipFile(zipFilePath); 176 String directoryPath = ""; 177 if (null == targetPath || "".equals(targetPath)) { 178 directoryPath = zipFilePath.substring(0, zipFilePath 179 .lastIndexOf(".")); 180 } else { 181 directoryPath = targetPath; 182 } 183 Enumeration entryEnum = zipFile.getEntries(); 184 if (null != entryEnum) { 185 ZipEntry zipEntry = null; 186 while (entryEnum.hasMoreElements()) { 187 zipEntry = (ZipEntry) entryEnum.nextElement(); 188 if (zipEntry.isDirectory()) { 189 directoryPath = directoryPath + File.separator 190 + zipEntry.getName(); 191 System.out.println(directoryPath); 192 continue; 193 } 194 if (zipEntry.getSize() > 0) { 195 // 文件 196 File targetFile = FileUtil.buildFile(directoryPath 197 + File.separator + zipEntry.getName(), false); 198 os = new BufferedOutputStream(new FileOutputStream( 199 targetFile)); 200 is = zipFile.getInputStream(zipEntry); 201 byte[] buffer = new byte[4096]; 202 int readLen = 0; 203 while ((readLen = is.read(buffer, 0, 4096)) >= 0) { 204 os.write(buffer, 0, readLen); 205 } 206 207 os.flush(); 208 os.close(); 209 } else { 210 // 空目录 211 FileUtil.buildFile(directoryPath + File.separator 212 + zipEntry.getName(), true); 213 } 214 } 215 } 216 } catch (IOException ex) { 217 throw ex; 218 } finally { 219 if(null != zipFile){ 220 zipFile = null; 221 } 222 if (null != is) { 223 is.close(); 224 } 225 if (null != os) { 226 os.close(); 227 } 228 } 229 } 230} 231 补充一下里面用到的一个自己写的FileUtil的一个方法 /** * 生产文件 如果文件所在路径不存在则生成路径 * * @param fileName * 文件名 带路径 * @param isDirectory 是否为路径 * @return * @author yayagepei * @date 2008-8-27 */ public static File buildFile(String fileName, boolean isDirectory) { File target = new File(fileName); if (isDirectory) { target.mkdirs(); } else { if (!target.getParentFile().exists()) { target.getParentFile().mkdirs(); target = new File(target.getAbsolutePath()); } } return target; }