java压缩 GZIP进行简单压缩，ZIP进行多文件保存
package org.rui.io.compress;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
/**
* 用GZIP进行简单压缩
* @author lenovo
*
*/
public class GZIPcompress {
static String path="D:\\Users\\liangrui\\workspace\\thinking\\src\\org\\rui\\io\\compress\\";
static String [] arg=new String[]{path+"GZIPcompress.java"};
public static void main(String[] args) throws Exception {
//in
BufferedReader in=new BufferedReader(new FileReader(arg[0]));
//out
BufferedOutputStream out=new BufferedOutputStream(new GZIPOutputStream(
new FileOutputStream("test.gz")
));
System.out.println("writing file");
int c;
while((c=in.read())!=-1)
{
out.write(c);
}
//close
in.close();
out.close();
System.out.println("reading file================");
BufferedReader br=new BufferedReader(
new InputStreamReader(
new GZIPInputStream(
new FileInputStream("test.gz")
)
)
);
String s;
while((s=br.readLine())!=null)
System.out.println(s);
}
}
package org.rui.io.compress;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.util.Enumeration;
import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
/**
* 用Zip进行多文件保存
* @author lenovo
*
*/
public class ZipCompress {
//static String path="D:\\Users\\liangrui\\workspace\\thinking\\src\\org\\rui\\io\\compress\\";
static String path=new File("").getAbsolutePath()+"\\src\\org\\rui\\io\\compress\\";
static String [] arg=new String[]{path+"GZIPcompress.java",path+"ZipCompress.java"};
public static void main(String[] args) throws Exception {
//out
FileOutputStream f=new FileOutputStream("test.zip");
CheckedOutputStream cos=new CheckedOutputStream(f,new Adler32());
ZipOutputStream zos=new ZipOutputStream(cos);
//out
BufferedOutputStream out=new BufferedOutputStream(zos);
zos.setComment("A test of java zipping");
for(String s:arg)
{
System.out.println("writing file "+s);
BufferedReader in =new BufferedReader(new FileReader(s));
//
zos.putNextEntry(new ZipEntry(s));
int c;
while((c=in.read())!=-1){
out.write(c);
}
in.close();
out.flush();
}
out.close();
//checksum valid only after the file has been closed!
System.out.println("reading file================");
FileInputStream fi=new FileInputStream("test.zip");
CheckedInputStream csumi=new CheckedInputStream(fi,new Adler32());
ZipInputStream zis=new ZipInputStream(csumi);
BufferedInputStream bis=new BufferedInputStream(zis);
ZipEntry ze;
while((ze=zis.getNextEntry())!=null)
{
System.out.println("Reading file "+ze);
int x;
while((x=bis.read())!=-1)
{
//System.out.print((char)x);
System.out.write(x);
}
}
//
if(arg.length==1)
System.out.println("checksum:"+csumi.getChecksum().getValue());
bis.close();
//alternative way to open and read zip files
ZipFile zf=new ZipFile("test.zip");
Enumeration e=zf.entries();
while(e.hasMoreElements())
{
ZipEntry ze2=(ZipEntry) e.nextElement();
System.out.println("file:"+ze2);
//...and extract the data as before
}
/*if(arg.length==1)*/
}
}