想到壓縮一般大家會先想到rar,由於rar的壓縮度高,但人家可是收費的。JAVA中如果要實現壓縮一般都是用zip壓縮。
首先,講下壓縮文件
import java.io.*; import java.util.zip.*;//ZipOutputStream這個流在這裏 import java.util.*; public class ZipOutputStreamTest { public static void main(String[] args) throws Exception { File f = new File("a.jpg"); FileInputStream fis = new FileInputStream(f); BufferedInputStream bis = new BufferedInputStream(fis); byte[] buf = new byte[1024]; int len; FileOutputStream fos = new FileOutputStream(f.getName()+".zip"); BufferedOutputStream bos = new BufferedOutputStream(fos); ZipOutputStream zos = new ZipOutputStream(bos);//壓縮包 ZipEntry ze = new ZipEntry(f.getName());//這是壓縮包名裏的文件名 zos.putNextEntry(ze);//寫入新的 ZIP 文件條目並將流定位到條目數據的開始處 while((len=bis.read(buf))!=-1) { zos.write(buf,0,len); zos.flush(); } bis.close(); zos.close(); } }
壓縮文件夾
import java.io.File; import org.apache.tools.zip.ZipOutputStream; //這個包在ant.jar裏,要到官方網下載 import java.io.FileInputStream; import java.io.FileOutputStream; import java.util.zip.ZipInputStream; import java.util.zip.ZipEntry; public class CompressBook { public CompressBook() {} /**//* * inputFileName 輸入一個文件夾 * zipFileName 輸出一個壓縮文件夾 */ public void zip(String inputFileName) throws Exception { String zipFileName = "c://test.zip"; //打包後文件名字 System.out.println(zipFileName); zip(zipFileName, new File(inputFileName)); } private void zip(String zipFileName, File inputFile) throws Exception { ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName)); zip(out, inputFile, ""); System.out.println("zip done"); out.close(); } private void zip(ZipOutputStream out, File f, String base) throws Exception { if (f.isDirectory()) { File[] fl = f.listFiles(); out.putNextEntry(new org.apache.tools.zip.ZipEntry(base + "/")); base = base.length() == 0 ? "" : base + "/"; for (int i = 0; i < fl.length; i++) { zip(out, fl[i], base + fl[i].getName()); } }else { out.putNextEntry(new org.apache.tools.zip.ZipEntry(base)); FileInputStream in = new FileInputStream(f); int b; System.out.println(base); while ( (b = in.read()) != -1) { out.write(b); } in.close(); } } public static void main(String [] temp){ CompressBook book = new CompressBook(); try { book.zip("c://c");//你要壓縮的文件夾 }catch (Exception ex) { ex.printStackTrace(); } } }
注意:內容的中文亂碼問題,這個問題網上很多人給出瞭解決方法,
兩種:修改sun的源碼;使用開源的類庫org.apache.tools.zip.ZipOutputStream和org.apache.tools.zip.ZipEntry,這兩個類ant.jar中有,可以下載使用即可,毫無疑問,選擇後者更方便。