Java建立Zip压缩文件的代码实例

Java建立Zip压缩文件的代码实例

import java.io.*;
import java.util.zip.*;
class Zip {
public static void main(String args[]) throws IOException {
byte b[] = new byte[512];
ZipOutputStream zout = new ZipOutputStream(System.out);
for(int i = 0; i < args.length; i ++) {
InputStream in = new FileInputStream(args[i]);
ZipEntry e = new ZipEntry(args[i].replace(File.separatorChar,'/'));
zout.putNextEntry(e);
int len=0;
while((len=in.read(b)) != -1) {
zout.write(b,0,len);
}
zout.closeEntry();
print(e);
}
zout.close();
}

public static void print(ZipEntry e){
PrintStream err = System.err;
err.print("added " + e.getName());
if (e.getMethod() == ZipEntry.DEFLATED) {
long size = e.getSize();
if (size > 0) {
long csize = e.getCompressedSize();
long ratio = ((size-csize)*100) / size;
err.println(" (deflated " + ratio + "%)");
}
else {
err.println(" (deflated 0%)");
}
}
else {
err.println(" (stored 0%)");
}
}
}

压缩文件代码：

import java.io.*;
import java.util.zip.*;//ZipOutputStream这个流在这里
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);//压缩包
       ZipEntry ze = new ZipEntry(f.getName());//这是压缩包名里的文件名
       zos.putNextEntry(ze);//写入新的 ZIP 文件条目并将流定位到条目数据的开始处

       while((len=bis.read(buf))!=-1)
       {
          zos.write(buf,0,len);
          zos.flush();
       }
       bis.close();
       zos.close(); 
     }
}

压缩文件夹代码：

import java.io.File;
import org.apache.tools.zip.ZipOutputStream; //这个包在ant.jar里，要到官方网下载
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipEntry;

public class CompressBook {
    public CompressBook() {}

    /**//*
    * inputFileName 输入一个文件夹
    * zipFileName 输出一个压缩文件夹
    */
    public void zip(String inputFileName) throws Exception {
        String zipFileName = "c:\\test.zip"; //打包后文件名字
        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");//你要压缩的文件夹
        }catch (Exception ex) {
           ex.printStackTrace();
       }
    }
}

由于java.util.zip.ZipOutputStream有中文乱码问题，所以采用org.apache.tools.zip.ZipOutputStream。 
以下是代码： 
Java代码 
package net.szh.zip;

import java.io.BufferedInputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.util.zip.CRC32; 
import java.util.zip.CheckedOutputStream;

import org.apache.tools.zip.ZipEntry; 
import org.apache.tools.zip.ZipOutputStream;

public class ZipCompressor { 
static final int BUFFER = 8192;

private File zipFile;

public ZipCompressor(String pathName) { 
zipFile = new File(pathName); 
}

public void compress(String srcPathName) { 
File file = new File(srcPathName); 
if (!file.exists()) 
throw new RuntimeException(srcPathName + "不存在！"); 
try { 
FileOutputStream fileOutputStream = new FileOutputStream(zipFile); 
CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream, 
new CRC32()); 
ZipOutputStream out = new ZipOutputStream(cos); 
String basedir = ""; 
compress(file, out, basedir); 
out.close(); 
} catch (Exception e) { 
throw new RuntimeException(e); 
} 
}

private void compress(File file, ZipOutputStream out, String basedir) { 
/* 判断是目录还是文件 */ 
if (file.isDirectory()) { 
System.out.println("压缩：" + basedir + file.getName()); 
this.compressDirectory(file, out, basedir); 
} else { 
System.out.println("压缩：" + basedir + file.getName()); 
this.compressFile(file, out, basedir); 
} 
}

/** 压缩一个目录 */ 
private void compressDirectory(File dir, ZipOutputStream out, String basedir) { 
if (!dir.exists()) 
return;

File[] files = dir.listFiles(); 
for (int i = 0; i < files.length; i++) { 
/* 递归 */ 
compress(files[i], out, basedir + dir.getName() + "/"); 
} 
}

/** 压缩一个文件 */ 
private void compressFile(File file, ZipOutputStream out, String basedir) { 
if (!file.exists()) { 
return; 
} 
try { 
BufferedInputStream bis = new BufferedInputStream( 
new FileInputStream(file)); 
ZipEntry entry = new ZipEntry(basedir + file.getName()); 
out.putNextEntry(entry); 
int count; 
byte data[] = new byte[BUFFER]; 
while ((count = bis.read(data, 0, BUFFER)) != -1) { 
out.write(data, 0, count); 
} 
bis.close(); 
} catch (Exception e) { 
throw new RuntimeException(e); 
} 
} 
}