在JDK中有一个zip工具类：
java.util.zip Provides classes for reading and writing the standard ZIP and
GZIP file formats.
使用此类可以将文件夹或者多个文件进行打包压缩操作。
在使用之前先了解关键方法：
ZipEntry(String name) Creates a new zip entry with the specified name.
使用ZipEntry的构造方法可以创建一个zip压缩文件包的实例，然后通过ZipOutputStream将待压缩的文件以流的形式写进该压缩包中。具体实现代码如下：
importjava.io.BufferedInputStream;
importjava.io.BufferedOutputStream;
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileNotFoundException;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.util.zip.ZipEntry;
importjava.util.zip.ZipOutputStream;
/**
*将文件夹下面的文件
*打包成zip压缩文件
*
*@authoradmin
*
*/
publicfinalclassFileToZip{
privateFileToZip(){}
/**
*将存放在sourceFilePath目录下的源文件，打包成fileName名称的zip文件，并存放到zipFilePath路径下
*@paramsourceFilePath:待压缩的文件路径
*@paramzipFilePath:压缩后存放路径
*@paramfileName:压缩后文件的名称
*@return
*/
publicstaticbooleanfileToZip(StringsourceFilePath,StringzipFilePath,StringfileName){
booleanflag=false;
FilesourceFile=newFile(sourceFilePath);
FileInputStreamfis=null;
BufferedInputStreambis=null;
FileOutputStreamfos=null;
ZipOutputStreamzos=null;
if(sourceFile.exists()==false){
System.out.println("待压缩的文件目录："+sourceFilePath+"不存在.");
}else{
try{
FilezipFile=newFile(zipFilePath+"/"+fileName+".zip");
if(zipFile.exists()){
System.out.println(zipFilePath+"目录下存在名字为:"+fileName+".zip"+"打包文件.");
}else{
File[]sourceFiles=sourceFile.listFiles();
if(null==sourceFiles||sourceFiles.length<1){
System.out.println("待压缩的文件目录："+sourceFilePath+"里面不存在文件，无需压缩.");
}else{
fos=newFileOutputStream(zipFile);
zos=newZipOutputStream(newBufferedOutputStream(fos));
byte[]bufs=newbyte[1024*10];
for(inti=0;i<sourceFiles.length;i++){
//创建ZIP实体，并添加进压缩包
ZipEntryzipEntry=newZipEntry(sourceFiles[i].getName());
zos.putNextEntry(zipEntry);
//读取待压缩的文件并写进压缩包里
fis=newFileInputStream(sourceFiles[i]);
bis=newBufferedInputStream(fis,1024*10);
intread=0;
while((read=bis.read(bufs,0,1024*10))!=-1){
zos.write(bufs,0,read);
}
}
flag=true;
}
}
}catch(FileNotFoundExceptione){
e.printStackTrace();
thrownewRuntimeException(e);
}catch(IOExceptione){
e.printStackTrace();
thrownewRuntimeException(e);
}finally{
//关闭流
try{
if(null!=bis)bis.close();
if(null!=zos)zos.close();
}catch(IOExceptione){
e.printStackTrace();
thrownewRuntimeException(e);
}
}
}
returnflag;
}
publicstaticvoidmain(String[]args){
StringsourceFilePath="D:\TestFile";
StringzipFilePath="D:\tmp";
StringfileName="12700153file";
booleanflag=FileToZip.fileToZip(sourceFilePath,zipFilePath,fileName);
if(flag){
System.out.println("文件打包成功!");
}else{
System.out.println("文件打包失败!");
}
}
}
Ⅱ 如何用java读取zip文件名和zip内文件的文件名，在线等
public static void te(File f) throws IOException {
if (!.exists() || !f.isDirectory()) {
return;
}
File[] subFiles = f.listFiles();
ZipFile zipFile = null;
for (int i = 0, ii = subFiles == null ? 0 : subFiles.length; i < ii; i++) {
if (subFiles[i].isFile()) {
try {
zipFile = new ZipFile(subFiles[i]);
Enumeration entries = zipFile.entries();
System.out.println("压缩文件：" + subFiles[i].getAbsolutePath());
while(entries.hasMoreElements())
{
System.out.println(" entry:" + ((ZipEntry)entries.nextElement()).getName());
}
zipFile.close();
} catch (ZipException e) {
//System.out.println(e.getMessage());
}
}
}
}
Ⅲ java压缩文件的问题
有三种方式实现java压缩：
1、jdk自带的包java.util.zip.ZipOutputStream，不足之处，文件（夹）名称带中文时，出现乱码问题，实现代码如下：
/**
* 功能：把 sourceDir 目录下的所有文件进行 zip 格式的压缩，保存为指定 zip 文件
* @param sourceDir 如果是目录，eg：D:\\MyEclipse\\first\\testFile，则压缩目录下所有文件；
* 如果是文件，eg：D:\\MyEclipse\\first\\testFile\\aa.zip，则只压缩本文件
* @param zipFile 最后压缩的文件路径和名称,eg:D:\\MyEclipse\\first\\testFile\\aa.zip
*/
public File doZip(String sourceDir, String zipFilePath) throws IOException {
File file = new File(sourceDir);
File zipFile = new File(zipFilePath);
ZipOutputStream zos = null;
try {
// 创建写出流操作
OutputStream os = new FileOutputStream(zipFile);
BufferedOutputStream bos = new BufferedOutputStream(os);
zos = new ZipOutputStream(bos);
String basePath = null;
// 获取目录
if(file.isDirectory()) {
basePath = file.getPath();
}else {
basePath = file.getParent();
}
zipFile(file, basePath, zos);
}finally {
if(zos != null) {
zos.closeEntry();
zos.close();
}
}
return zipFile;
}
/**
* @param source 源文件
* @param basePath
* @param zos
*/
private void zipFile(File source, String basePath, ZipOutputStream zos)
throws IOException {
File[] files = null;
if (source.isDirectory()) {
files = source.listFiles();
} else {
files = new File[1];
files[0] = source;
}
InputStream is = null;
String pathName;
byte[] buf = new byte[1024];
int length = 0;
try{
for(File file : files) {
if(file.isDirectory()) {
pathName = file.getPath().substring(basePath.length() + 1) + "/";
zos.putNextEntry(new ZipEntry(pathName));
zipFile(file, basePath, zos);
}else {
pathName = file.getPath().substring(basePath.length() + 1);
is = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(is);
zos.putNextEntry(new ZipEntry(pathName));
while ((length = bis.read(buf)) > 0) {
zos.write(buf, 0, length);
}
}
}
}finally {
if(is != null) {
is.close();
}
}
}
2、使用org.apache.tools.zip.ZipOutputStream，代码如下，
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);
}
}
}
3、可以用ant中的org.apache.tools.ant.taskdefs.Zip来实现，更加简单。
package net.szh.zip;
import java.io.File;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.Zip;
import org.apache.tools.ant.types.FileSet;
public class ZipCompressorByAnt {
private File zipFile;
public ZipCompressorByAnt(String pathName) {
zipFile = new File(pathName);
}
public void compress(String srcPathName) {
File srcdir = new File(srcPathName);
if (!srcdir.exists())
throw new RuntimeException(srcPathName + "不存在！");
Project prj = new Project();
Zip zip = new Zip();
zip.setProject(prj);
zip.setDestFile(zipFile);
FileSet fileSet = new FileSet();
fileSet.setProject(prj);
fileSet.setDir(srcdir);
//fileSet.setIncludes("**/*.java"); 包括哪些文件或文件夹 eg:zip.setIncludes("*.java");
//fileSet.setExcludes(...); 排除哪些文件或文件夹
zip.addFileset(fileSet);
zip.execute();
}
}
测试一下
package net.szh.zip;
public class TestZip {
public static void main(String[] args) {
ZipCompressor zc = new ZipCompressor("E:\\szhzip.zip");
zc.compress("E:\\test");
ZipCompressorByAnt zca = new ZipCompressorByAnt("E:\\szhzipant.zip");
zca.compress("E:\\test");
}
}
Ⅳ java如何实现压缩图片且保留图片原文件属性，比如拍摄日期
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;public class Zip {
// 压缩
public static void zip(String zipFileName, String inputFile)
throws Exception {
File f = new File(inputFile);
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
zipFileName));
zip(out, f, null);
System.out.println("zip done");
out.close();
} private static void zip(ZipOutputStream out, File f, String base)
throws Exception {
System.out.println("zipping " + f.getAbsolutePath());
if (f != null && f.isDirectory()) {
File[] fc = f.listFiles();
if (base != null)
out.putNextEntry(new ZipEntry(base + "/"));
base = base == null ? "" : base + "/";
for (int i = 0; i < fc.length; i++) {
zip(out, fc[i], base + fc[i].getName());
}
} else {
out.putNextEntry(new ZipEntry(base));
FileInputStream in = new FileInputStream(f);
int b;
while ((b = in.read()) != -1)
out.write(b);
in.close();
}
} // 解压
public static void unzip(String zipFileName, String outputDirectory)
throws Exception {
ZipInputStream in = new ZipInputStream(new FileInputStream(zipFileName));
ZipEntry z;
while ((z = in.getNextEntry()) != null) {
String name = z.getName();
if (z.isDirectory()) {
name = name.substring(0, name.length() - 1);
File f = new File(outputDirectory + File.separator + name);
f.mkdir();
System.out.println("MD " + outputDirectory + File.separator
+ name);
} else {
System.out.println("unziping " + z.getName());
File f = new File(outputDirectory + File.separator + name);
f.createNewFile();
FileOutputStream out = new FileOutputStream(f);
int b;
while ((b = in.read()) != -1)
out.write(b);
out.close();
}
}
in.close();
} public void deleteFolder(File dir) {
File filelist[] = dir.listFiles();
int listlen = filelist.length;
for (int i = 0; i < listlen; i++) {
if (filelist[i].isDirectory()) {
deleteFolder(filelist[i]);
} else {
filelist[i].delete();
}
}
dir.delete();// 删除当前目录
} public static void main(String[] args) {
try {
// TestZip t = new TestZip();
// t.zip("c:\\test.zip","c:\\test");
// t.unzip("c:\\test.zip","c:\\test2");
} catch (Exception e) {
e.printStackTrace(System.out);
}
}
}
Ⅳ Java压缩与解压缩问题
/**
*类名：zipFileRelease
*说明：一个zip文件解压类
*介绍：主要的zip文件释放方法releaseHandle()
* 用ZipInputStream类和ZipEntry类将zip文件的入口清单列举出来，然后
* 根据用户提供的输出路径和zip文件的入口进行组合通过DataOutputStream
* 和File类进行文件的创建和目录的创建，创建文件时的文件数据是通过
* ZipInputStream类、ZipEntry类、InputStream类之间的套嵌组合获得的。
*注意：如果zip文件中包含中文路径程序将会抛出异常
*日期：2005-7-1
*作者：Pcera
*/
import java.io.*;
import java.util.*;
import java.util.zip.*;
class zipFileRelease{
private String inFilePath;
private String releaseFilePath;
private String[] FileNameArray; //存放文件名称的数组
private ZipEntry entry;
//
private FileInputStream fileDataIn;
private FileOutputStream fileDataOut;
private ZipInputStream zipInFile;
private DataOutputStream writeData;
private DataInputStream readData;
//
private int zipFileCount = 0; //zip文件中的文件总数
private int zipPathCount = 0; //zip文件中的路径总数
/**
*初始化函数
*初始化zip文件流、输出文件流以及其他变量的初始化
*/
public zipFileRelease(String inpath,String releasepath){
inFilePath = inpath;
releaseFilePath = releasepath;
}
/**
*初始化读取文件流函数
*参数：FileInputStream类
*返回值：初始化成功返回0，否则返回-1
*/
protected long initInStream(ZipInputStream zipFileA){
try{
readData = new DataInputStream(zipFileA);
return 0;
}catch(Exception e){
e.printStackTrace();
return -1;
}
}
/**
*测试文件路径
*参数：zip文件的路径和要释放的位置
*返回值：是两位整数，两位数中的十位代表输入路径和输出路径(1输入、2输出)
* 各位数是代表绝对路径还是相对路径(1绝对、0相对)
* 返回-1表示路径无效
protected long checkPath(String inPath,String outPath){
File infile = new File(inPath);
File infile = new File(outPath);
}
*/
/**
*初始化输出文件流
*参数：File类
*返回值：初始化成功返回0，否则返回-1
*/
protected long initOutStream(String outFileA){
try{
fileDataOut = new FileOutputStream(outFileA);
writeData = new DataOutputStream(fileDataOut);
return 0;
}catch(IOException e){
e.printStackTrace();
return -1;
}
}
/**
*测试文件是否存在方法
*参数：File类
*返回值：如果文件存在返回文件大小，否则返回-1
*/
public long checkFile(File inFileA){
if (inFileA.exists()){
return 0;
}else{
return -1;
}
}
/**
*判断文件是否可以读取方法
*参数：File类
*返回值：如果可以读取返回0，否则返回-1
*/
public long checkOpen(File inFileA){
if(inFileA.canRead()){
return inFileA.length();
}else{
return -1;
}
}
/**
*获得zip文件中的文件夹和文件总数
*参数：File类
*返回值：如果正常获得则返回总数，否则返回-1
*/
public long getFilFoldCount(String infileA){
try{
int fileCount = 0;
zipInFile = new ZipInputStream(new FileInputStream(infileA));
while ((entry = zipInFile.getNextEntry()) != null){
if (entry.isDirectory()){
zipPathCount++;
}else{
zipFileCount++;
}
fileCount++;
}
return fileCount;
}catch(IOException e){
e.printStackTrace();
return -1;
}
}
/**
*读取zip文件清单函数
*参数：File类
*返回值：文件清单数组
*/
public String[] getFileList(String infileA){
try{
ZipInputStream AzipInFile = new ZipInputStream(new FileInputStream(infileA));
//创建数组对象
FileNameArray = new String[(int)getFilFoldCount(infileA)];
//将文件名清单传入数组
int i = 0;
while ((entry = AzipInFile.getNextEntry()) != null){
FileNameArray[i++] = entry.getName();
}
return FileNameArray;
}catch(IOException e){
e.printStackTrace();
return null;
}
}
/**
*创建文件函数
*参数：File类
*返回值:如果创建成功返回0，否则返回-1
*/
public long writeFile(String outFileA,byte[] dataByte){
try{
if (initOutStream(outFileA) == 0){
writeData.write(dataByte);
fileDataOut.close();
return 0;
}else{
fileDataOut.close();
return -1;
}
}catch(IOException e){
e.printStackTrace();
return -1;
}
}
/**
*读取文件内容函数
*参数：File类
*返回值:如果读取成功则返回读取数据的字节数组，如果失败则返回空值
*/
protected byte[] readFile(ZipEntry entryA,ZipInputStream zipFileA){
try{
long entryFilelen;
if (initInStream(zipFileA) == 0){
if ((entryFilelen = entryA.getSize()) >= 0){
byte[] entryFileData = new byte[(int)entryFilelen];
readData.readFully(entryFileData,0,(int)entryFilelen);
return entryFileData;
}else{
return null;
}
}else{
return null;
}
}catch(IOException e){
e.printStackTrace();
return null;
}
}
/**
*创建目录函数
*参数：要创建目录的路径
*返回值：如果创建成功则返回0，否则返回-1
*/
public long createFolder(String dir){
File file = new File(dir);
if (file.mkdirs()) {
return 0;
}else{
return -1;
}
}
/**
*删除文件
*参数：要删除的文件
*返回值：如果删除成功则返回0，要删除的文件不存在返回-2
* 如果要删除的是个路径则返回-3，删除失败则返回-1
*/
public long deleteFile(String Apath) throws SecurityException {
File file = new File(Apath.trim());
//文件或路径不存在
if (!file.exists()){
return -2;
}
//要删除的是个路径
if (!file.isFile()){
return -3;
}
//删除
if (file.delete()){
return 0;
}else{
return -1;
}
}
/**
*删除目录
*参数：要删除的目录
*返回值：如果删除成功则返回0，删除失败则返回-1
*/
public long deleteFolder(String Apath){
File file = new File(Apath);
//删除
if (file.delete()){
return 0;
}else{
return -1;
}
}
/**
*判断所要解压的路径是否存在同名文件
*参数：解压路径
*返回值：如果存在同名文件返回-1，否则返回0
*/
public long checkPathExists(String AreleasePath){
File file = new File(AreleasePath);
if (!file.exists()){
return 0;
}else{
return -1;
}
}
/**
*删除zip中的文件
*参数：文件清单数组，释放路径
*返回值：如果删除成功返回0,否则返回-1
*/
protected long deleteReleaseZipFile(String[] listFilePath,String releasePath){
long arrayLen,flagReturn;
int k = 0;
String tempPath;
//存放zip文件清单的路径
String[] pathArray = new String[zipPathCount];
//删除文件
arrayLen = listFilePath.length;
for(int i=0;i<(int)arrayLen;i++){
tempPath = releasePath.replace('\\','/') + listFilePath[i];
flagReturn = deleteFile(tempPath);
if (flagReturn == -2){
//什么都不作
}else if (flagReturn == -3){
pathArray[k++] = tempPath;
}else if (flagReturn == -1){
return -1;
}
}
//删除路径
for(k = k - 1;k>=0;k--){
flagReturn = deleteFolder(pathArray[k]);
if (flagReturn == -1) return -1;
}
return 0;
}
/**
*获得zip文件的最上层的文件夹名称
*参数：zip文件路径
*返回值：文件夹名称，如果失败则返回null
*/
public String getZipRoot(String infileA){
String rootName;
try{
FileInputStream tempfile = new FileInputStream(infileA);
ZipInputStream AzipInFile = new ZipInputStream(tempfile);
ZipEntry Aentry;
Aentry = AzipInFile.getNextEntry();
rootName = Aentry.getName();
tempfile.close();
AzipInFile.close();
return rootName;
}catch(IOException e){
e.printStackTrace();
return null;
}
}
/**
*释放流，释放占用资源
*/
protected void closeStream() throws Exception{
fileDataIn.close();
fileDataOut.close();
zipInFile.close();
writeData.flush();
}
/**
*解压函数
*对用户的zip文件路径和解压路径进行判断，是否存在和打开
*在输入解压路径时如果输入"/"则在和zip文件存放的统计目录下进行解压
*返回值：0表示释放成功
* -1 表示您所要解压的文件不存在、
* -2表示您所要解压的文件不能被打开、
* -3您所要释放的路径不存在、
* -4您所创建文件目录失败、
* -5写入文件失败、
* -6表示所要释放的文件已经存在、
* -50表示文件读取异常
*/
public long releaseHandle() throws Exception{
File inFile = new File(inFilePath);
File outFile = new File(releaseFilePath);
String tempFile;
String zipPath;
String zipRootPath;
String tempPathParent; //存放释放路径
byte[] zipEntryFileData;
//作有效性判断
if (checkFile(inFile) == -1) {
return -1;}
if (checkOpen(inFile) == -1) {
return -2;}
//不是解压再当前目录下时对路径作有效性检验
if (!releaseFilePath.equals("/")){
//解压在用户指定目录下
if (checkFile(outFile) == -1) {
return -3;}
}
//获得标准释放路径
if (!releaseFilePath.equals("/")) {
tempPathParent = releaseFilePath.replace('\\','/')+ "/";
}else{
tempPathParent = inFile.getParent().replace('\\','/')+ "/";
}
//获得zip文件中的入口清单
FileNameArray = getFileList(inFilePath);
//获得zip文件的最上层目录
zipRootPath = getZipRoot(inFilePath);
//
fileDataIn = new FileInputStream(inFilePath);
zipInFile = new ZipInputStream(fileDataIn);
//判断是否已经存在要释放的文件夹
if (zipRootPath.lastIndexOf("/") > 0 ){
if (checkPathExists(tempPathParent +
zipRootPath.substring(0,zipRootPath.lastIndexOf("/"))) == -1){
return -6;
}
}else{
if (checkPathExists(tempPathParent + zipRootPath) == -1){
return -6;
}
}
//
try{
//创建文件夹和文件
int i = 0;
while ((entry = zipInFile.getNextEntry()) != null){
if (entry.isDirectory()){
//创建目录
zipPath = tempPathParent + FileNameArray[i];
zipPath = zipPath.substring(0,zipPath.lastIndexOf("/"));
if (createFolder(zipPath) == -1){
closeStream();
deleteReleaseZipFile(FileNameArray,tempPathParent);
return -4;
}
}else{
//读取文件数据
zipEntryFileData = readFile(entry,zipInFile);
//向文件写数据
tempFile = tempPathParent + FileNameArray[i];
//写入文件
if (writeFile(tempFile,zipEntryFileData) == -1){
closeStream();
deleteReleaseZipFile(FileNameArray,tempPathParent);
return -5;
}
}
i++;
}
//释放资源
closeStream();
return 0;
}catch(Exception e){
closeStream();
deleteReleaseZipFile(FileNameArray,tempPathParent);
e.printStackTrace();
return -50;
}
}
/**
*演示函数
*根据用户输入的路径对文件进行解压
*/
public static void main(String args[]) throws Exception {
long flag; //返回标志
String inPath,releasePath;
//获得用户输入信息
BufferedReader userInput = new BufferedReader(
new InputStreamReader(System.in));
System.out.println("请输入zip文件路径：");
inPath = userInput.readLine();
System.out.println("请输入保存路径：");
releasePath = userInput.readLine();
userInput.close();
//执行解压缩
zipFileRelease pceraZip = new zipFileRelease(inPath,releasePath);
flag = pceraZip.releaseHandle();
//出错信息打印
if (flag == 0) System.out.println("释放成功！！！");
if (flag == -1) System.out.println("您所要解压的文件不存在！");
if (flag == -2) System.out.println("您所要解压的文件不能被打开！");
if (flag == -3) System.out.println("您所要释放的路径不存在！");
if (flag == -4) System.out.println("您所创建文件目录失败！");
if (flag == -5) System.out.println("写入文件失败！");
if (flag == -6) System.out.println("文件已经存在！");
if (flag == -50) System.out.println("文件读取异常！");
}
}
Ⅵ java 如何将 txt 文件 变成zip压缩文件 求例子！！
这个要用 压缩流类 ZipOutputStream
下面是一个例子 在D盘下有个 名字叫 demo.txt的文件.程序运行后会再D盘下生成一个demo.zip的文件,以下是代码:
import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class ZipOutputStreamDemo {
public static void main(String args[]) throws IOException {
//定义要压缩的文件 也就是说在D盘里有个 demo.txt 的文件(必须要有,否者会有异常,实际应用中可判断);
File file = new File("d:" + File.separator + "demo.txt");
//定义压缩文件的名称
File zipFile = new File("d:" + File.separator + "demo.zip");
//定义输入文件流
InputStream input = new FileInputStream(file);
//定义压缩输出流
ZipOutputStream zipOut = null;
//实例化压缩输出流,并制定压缩文件的输出路径 就是D盘下,名字叫 demo.zip
zipOut = new ZipOutputStream(new FileOutputStream(zipFile));
zipOut.putNextEntry(new ZipEntry(file.getName()));
//设置注释
zipOut.setComment("www.demo.com");
int temp = 0;
while((temp = input.read()) != -1) {
zipOut.write(temp);
}
input.close();
zipOut.close();
}
}
希望能帮助楼主,建议楼主多看看JDK文档,设计到文件的输出什么都在JAVA.IO包里,好好看看..
不过楼主要知道,压缩流也是inputstream和outputstream的子类,但是并没有定义在java.io包里,而是以一个工具类的形式出现的,但是在用的时候还是需要java.io包的支持的...
Ⅶ 用java小应用程序实现文件压缩、解压缩
40.ZIP压缩文件
/*
import java.io.*;
import java.util.zip.*;
*/
//创建文件输入流对象
FileInputStream fis=new FileInputStream(%%1);
//创建文件输出流对象
FileOutputStream fos=new FileOutputStream(%%2);
//创建ZIP数据输出流对象
ZipOutputStream zipOut=new ZipOutputStream(fos);
//创建指向压缩原始文件的入口
ZipEntry entry=new ZipEntry(args[0]);
zipOut.putNextEntry(entry);
//向压缩文件中输出数据
int nNumber;
byte[] buffer=new byte[1024];
while((nNumber=fis.read(buffer))!=-1)
zipOut.write(buffer,0,nNumber);
//关闭创建的流对象
zipOut.close();
fos.close();
fis.close();
}
catch(IOException e)
{
System.out.println(e);
}
41.获得应用程序完整路径
String %%1=System.getProperty("user.dir");
42.ZIP解压缩
/*
import java.io.*;
import java.util.zip.*;
*/
try{
//创建文件输入流对象实例
FileInputStream fis=new FileInputStream(%%1);
//创建ZIP压缩格式输入流对象实例
ZipInputStream zipin=new ZipInputStream(fis);
//创建文件输出流对象实例
FileOutputStream fos=new FileOutputStream(%%2);
//获取Entry对象实例
ZipEntry entry=zipin.getNextEntry();
byte[] buffer=new byte[1024];
int nNumber;
while((nNumber=zipin.read(buffer,0,buffer.length))!=-1)
fos.write(buffer,0,nNumber);
//关闭文件流对象
zipin.close();
fos.close();
fis.close();
}
catch(IOException e) {
System.out.println(e);
}
43.递归删除目录中的文件
/*
import java.io.*;
import java.util.*;
*/
ArrayList<String> folderList = new ArrayList<String>();
folderList.add(%%1);
for (int j = 0; j < folderList.size(); j++) {
File file = new File(folderList.get(j));
File[] files = file.listFiles();
ArrayList<File> fileList = new ArrayList<File>();
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory()) {
folderList.add(files[i].getPath());
} else {
fileList.add(files[i]);
}
}
for (File f : fileList) {
f.delete();
}
}
43.ZIP压缩文件夹
/*
http://findjar.com/index.jsp
import java.io.*;
import org.apache.tools.zip.ZipOutputStream; //这个包在ant.jar里，要到官方网下载
//java.util.zip.ZipOutputStream
import java.util.zip.*;
*/
try {
String zipFileName = %%2; //打包后文件名字
File f=new File(%%1);
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName));
String base= "";
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;
while ( (b = in.read()) != -1) {
out.write(b);
}
in.close();
}
out.close();
}catch (Exception ex) {
ex.printStackTrace();
}
/*
切，我刚好写了个压缩的，但没写解压的
1. 解压的(参数两个，第一个是你要解压的zip文件全路径，第二个是你解压之后要存放的位置)
/*
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
*/
public class ZipFileList {
public static void main(String[] args) {
extZipFileList(args[0],args[1]);
}
private static void extZipFileList(String zipFileName, String extPlace) {
try {
ZipInputStream in = new ZipInputStream(new FileInputStream(
zipFileName));
ZipEntry entry = null;
while ((entry = in.getNextEntry()) != null) {
String entryName = entry.getName();
if (entry.isDirectory()) {
File file = new File(extPlace + entryName);
file.mkdirs();
System.out.println("创建文件夹:" + entryName);
} else {
FileOutputStream os = new FileOutputStream(extPlace
+ entryName);
// Transfer bytes from the ZIP file to the output file
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
os.write(buf, 0, len);
}
os.close();
in.closeEntry();
}
}
} catch (IOException e) {
}
System.out.println("解压文件成功");
}
}
压缩的(参数最少传两个，第一个是你压缩之后的文件存放的位置以及名字，第二个是你要压缩的文件或者文件夹所在位置，也可以传多个文件或文件夹)
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class ZipFileOther {
public static String zipFileProcess(ArrayList outputZipFileNameList, String outputZipNameAndPath) {
ArrayList fileNames = new ArrayList();
ArrayList files = new ArrayList();
FileOutputStream fileOut = null;
ZipOutputStream outputStream = null;
FileInputStream fileIn = null;
StringBuffer sb = new StringBuffer(outputZipNameAndPath);
// FileInputStream fileIn =null;
try {
if (outputZipNameAndPath.indexOf(".zip") != -1) {
outputZipNameAndPath = outputZipNameAndPath;
} else {
sb.append(".zip");
outputZipNameAndPath = sb.toString();
}
fileOut = new FileOutputStream(outputZipNameAndPath);
outputStream = new ZipOutputStream(fileOut);
int outputZipFileNameListSize = 0;
if (outputZipFileNameList != null) {
outputZipFileNameListSize = outputZipFileNameList.size();
}
for (int i = 0; i < outputZipFileNameListSize; i++) {
File rootFile = new File(outputZipFileNameList.get(i).toString());
listFile(rootFile, fileNames, files, "");
}
for (int loop = 0; loop < files.size(); loop++) {
fileIn = new FileInputStream((File) files.get(loop));
outputStream.putNextEntry(new ZipEntry((String) fileNames.get(loop)));
byte[] buffer = new byte[1024];
while (fileIn.read(buffer) != -1) {
outputStream.write(buffer);
}
outputStream.closeEntry();
fileIn.close();
}
return outputZipNameAndPath;
} catch (IOException ioe) {
return null;
} finally {
if (outputStream != null) {
try {
outputStream.close();
} catch (IOException e) {
}
}
if (fileIn != null) {
try {
fileIn.close();
} catch (IOException e) {
}
}
}
}
public static void main(String[] args) {
ArrayList outputZipFileName=new ArrayList();
String savePath="";
int argSize = 0;
if (args != null) {
argSize = args.length;
}
if (argSize > 1) {
if(args[0]!=null)
savePath = args[0];
for(int i=1;i<argSize;i++){
if(args[i]!=null){
outputZipFileName.add(args[i]);
}
}
ZipFileOther instance=new ZipFileOther();
instance.zipFileProcess(outputZipFileName,savePath);
} else {
}
}
private static void listFile(File parentFile, List nameList, List fileList, String directoryName) {
if (parentFile.isDirectory()) {
File[] files = parentFile.listFiles();
for (int loop = 0; loop < files.length; loop++) {
listFile(files[loop], nameList, fileList, directoryName + parentFile.getName() + "/");
}
} else {
fileList.add(parentFile);
nameList.add(directoryName + parentFile.getName());
}
}
}
*/
Ⅷ java中将一个文件夹下所有的文件压缩成一个文件,然后,解压到指定目录.
import java.io.*;
import java.util.zip.*;
public class CompressD {
// 缓冲
static byte[] buffer = new byte[2048];
public static void main(String[] args) throws Exception {
// 来源
File inputDir = new File("C:\\CompressTest\\");
// 目标
FileOutputStream fos = new FileOutputStream("C:\\CompressTest.zip");
// 过滤
ZipOutputStream zos = new ZipOutputStream(fos);
// 压缩
zip(inputDir.listFiles(), "", zos);
// 关闭
zos.close();
}
private static void zip(File[] files, String baseFolder, ZipOutputStream zos)
throws Exception {
// 输入
FileInputStream fis = null;
// 条目
ZipEntry entry = null;
// 数目
int count = 0;
for (File file : files) {
if (file.isDirectory()) {
// 递归
zip(file.listFiles(), file.getName() + File.separator, zos);
continue;
}
entry = new ZipEntry(baseFolder + file.getName());
// 加入
zos.putNextEntry(entry);
fis = new FileInputStream(file);
// 读取
while ((count = fis.read(buffer, 0, buffer.length)) != -1)
// 写入
zos.write(buffer, 0, count);
}
}
}