java壓縮代碼
在JDK中有一個zip工具類:
java.util.zip Provides classes for reading and writing the standard ZIP and
GZIP file formats.
使用此類可以將文件夾或者多個文件進行打包壓縮操作。
在使用之前先了解關鍵方法:
ZipEntry(String name) Creates a new zip entry with the specified name.
使用ZipEntry的構造方法可以創建一個zip壓縮文件包的實例,然後通過ZipOutputStream將待壓縮的文件以流的形式寫進該壓縮包中。具體實現代碼如下:
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;
/**
*將文件夾下面的文件
*打包成zip壓縮文件
*
*@authoradmin
*
*/
publicfinalclassFileToZip{
privateFileToZip(){}
/**
*將存放在sourceFilePath目錄下的源文件,打包成fileName名稱的zip文件,並存放到zipFilePath路徑下
*@paramsourceFilePath:待壓縮的文件路徑
*@paramzipFilePath:壓縮後存放路徑
*@paramfileName:壓縮後文件的名稱
*@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("待壓縮的文件目錄:"+sourceFilePath+"不存在.");
}else{
try{
FilezipFile=newFile(zipFilePath+"/"+fileName+".zip");
if(zipFile.exists()){
System.out.println(zipFilePath+"目錄下存在名字為:"+fileName+".zip"+"打包文件.");
}else{
File[]sourceFiles=sourceFile.listFiles();
if(null==sourceFiles||sourceFiles.length<1){
System.out.println("待壓縮的文件目錄:"+sourceFilePath+"裡面不存在文件,無需壓縮.");
}else{
fos=newFileOutputStream(zipFile);
zos=newZipOutputStream(newBufferedOutputStream(fos));
byte[]bufs=newbyte[1024*10];
for(inti=0;i<sourceFiles.length;i++){
//創建ZIP實體,並添加進壓縮包
ZipEntryzipEntry=newZipEntry(sourceFiles[i].getName());
zos.putNextEntry(zipEntry);
//讀取待壓縮的文件並寫進壓縮包里
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{
//關閉流
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("文件打包失敗!");
}
}
}
② java讀取壓縮文件並壓縮
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
public class JZip {
public static int iCompressLevel;//壓縮比 取值范圍為0~9
public static boolean bOverWrite;//是否覆蓋同名文件 取值范圍為True和False
@SuppressWarnings("unchecked")
private static ArrayList AllFiles = new ArrayList();
public static String sErrorMessage;
private String zipFilePath;
public List<File> srcMap;
public JZip () {
iCompressLevel = 9;
// bOverWrite=true;
}
public JZip(String zipFilePath) throws FileNotFoundException, IOException {
this.zipFilePath = zipFilePath;
}
@SuppressWarnings("unchecked")
public static ArrayList extract (String sZipPathFile , String sDestPath) {
ArrayList AllFileName = new ArrayList();
try {
//先指定壓縮檔的位置和檔名,建立FileInputStream對象
FileInputStream fins = new FileInputStream(sZipPathFile);
//將fins傳入ZipInputStream中
ZipInputStream zins = new ZipInputStream(fins);
ZipEntry ze = null;
byte ch[] = new byte[256];
while ((ze = zins.getNextEntry()) != null) {
File zfile = new File(sDestPath + ze.getName());
File fpath = new File(zfile.getParentFile().getPath());
if (ze.isDirectory()) {
if (!zfile.exists())
zfile.mkdirs();
zins.closeEntry();
} else {
if (!fpath.exists())
fpath.mkdirs();
FileOutputStream fouts = new FileOutputStream(zfile);
int i;
AllFileName.add(zfile.getAbsolutePath());
while ((i = zins.read(ch)) != -1)
fouts.write(ch, 0, i);
zins.closeEntry();
fouts.close();
}
}
fins.close();
zins.close();
sErrorMessage = "OK";
} catch (Exception e) {
System.err.println("Extract error:" + e.getMessage());
sErrorMessage = e.getMessage();
}
AllFiles.clear();
return AllFileName;
}
@SuppressWarnings({ "unchecked", "static-access" })
public static void compress (String sPathFile , boolean bIsPath , String sZipPathFile) {
try {
String sPath;
//先指定壓縮檔的位置及檔名,建立一個FileOutputStream
FileOutputStream fos = new FileOutputStream(sZipPathFile);
//建立ZipOutputStream並將fos傳入
ZipOutputStream zos = new ZipOutputStream(fos);
//設置壓縮比
zos.setLevel(iCompressLevel);
if (bIsPath == true) {
searchFiles(sPathFile);
sPath = sPathFile;
} else {
File myfile = new File(sPathFile);
sPath = sPathFile.substring(0, sPathFile.lastIndexOf(myfile.separator) + 1);
AllFiles.add(myfile);
}
Object[] myobject = AllFiles.toArray();
ZipEntry ze = null;
//每個檔案要壓縮,都要透過ZipEntry來處理
FileInputStream fis = null;
BufferedReader in = null;
//byte[] ch = new byte[256];
for (int i = 0 ; i < myobject.length ; i++) {
File myfile = (File) myobject[i];
if (myfile.isFile()) {
in = new BufferedReader(new InputStreamReader(new FileInputStream(myfile.getPath()),"iso8859-1"));
//以檔案的名字當Entry,也可以自己再加上額外的路徑
//例如ze=new ZipEntry("test\\"+myfiles[i].getName());
//如此壓縮檔內的每個檔案都會加test這個路徑
ze = new ZipEntry(myfile.getPath().substring((sPath).length()));
//將ZipEntry透過ZipOutputStream的putNextEntry的方式送進去處理
fis = new FileInputStream(myfile);
zos.putNextEntry(ze);
int len = 0;
//開始將原始檔案讀進ZipOutputStream
while ((len = in.read()) != -1) {
zos.write(len);
}
fis.close();
zos.closeEntry();
}
}
zos.close();
fos.close();
AllFiles.clear();
sErrorMessage = "OK";
} catch (Exception e) {
System.err.println("Compress error:" + e.getMessage());
sErrorMessage = e.getMessage();
}
}
/*
這是一個遞歸過程,功能是檢索出所有的文件名稱
dirstr:目錄名稱
*/
@SuppressWarnings("unchecked")
private static void searchFiles (String dirstr) {
File tempdir = new File(dirstr);
if (tempdir.exists()) {
if (tempdir.isDirectory()) {
File[] tempfiles = tempdir.listFiles();
for (int i = 0 ; i < tempfiles.length ; i++) {
if (tempfiles[i].isDirectory())
searchFiles(tempfiles[i].getPath());
else {
AllFiles.add(tempfiles[i]);
}
}
} else {
AllFiles.add(tempdir);
}
}
}
public String getZipFilePath() {
return zipFilePath;
}
public void setZipFilePath(String zipFilePath) {
this.zipFilePath = zipFilePath;
}
/**
* 解析zip文件得到文件名
* @return
* @throws FileNotFoundException
* @throws IOException
*/
public boolean parserZip() throws FileNotFoundException, IOException {
FileInputStream fis = new FileInputStream(zipFilePath);
ZipInputStream zis = new ZipInputStream(new BufferedInputStream(fis));
ZipEntry entry;
try {
srcMap = new ArrayList<File>();
while ((entry = zis.getNextEntry()) != null) {
File file = new File(zipFilePath + File.separator + entry.getName());
srcMap.add(file);
}
zis.close();
fis.close();
return true;
} catch (IOException e) {
return false;
}
}
/**
*
* @param zipFileName 待解壓縮的ZIP文件
* @param extPlace 解壓後的文件夾
*/
public static void extZipFileList(String zipFileName, String extPlace) {
try {
ZipInputStream in = new ZipInputStream(new FileInputStream(
zipFileName));
File files = new File(extPlace);
files.mkdirs();
ZipEntry entry = null;
while ((entry = in.getNextEntry()) != null) {
String entryName = entry.getName();
if (entry.isDirectory()) {
File file = new File(files + entryName);
file.mkdirs();
System.out.println("創建文件夾:" + entryName);
} else {
OutputStream os = new FileOutputStream(files+File.separator + 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();
System.out.println("解壓文件:" + entryName);
}
}
} catch (IOException e) {
}
}
@SuppressWarnings("static-access")
public static void main(String args[]){
}
}
③ 如何用java 將文件加密壓縮為zip文件.
用java加密壓縮zip文件:
package com.ninemax.demo.zip.decrypt;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.zip.DataFormatException;
import org.apache.commons.io.FileUtils;
import de.idyl.winzipaes.AesZipFileDecrypter;
import de.idyl.winzipaes.AesZipFileEncrypter;
import de.idyl.winzipaes.impl.AESDecrypter;
import de.idyl.winzipaes.impl.AESDecrypterBC;
import de.idyl.winzipaes.impl.AESEncrypter;
import de.idyl.winzipaes.impl.AESEncrypterBC;
import de.idyl.winzipaes.impl.ExtZipEntry;
/**
* 壓縮指定文件或目錄為ZIP格式壓縮文件
* 支持中文(修改源碼後)
* 支持密碼(僅支持256bit的AES加密解密)
* 依賴bcprov項目(bcprov-jdk16-140.jar)
*
* @author zyh
*/
public class DecryptionZipUtil {
/**
* 使用指定密碼將給定文件或文件夾壓縮成指定的輸出ZIP文件
* @param srcFile 需要壓縮的文件或文件夾
* @param destPath 輸出路徑
* @param passwd 壓縮文件使用的密碼
*/
public static void zip(String srcFile,String destPath,String passwd) {
AESEncrypter encrypter = new AESEncrypterBC();
AesZipFileEncrypter zipFileEncrypter = null;
try {
zipFileEncrypter = new AesZipFileEncrypter(destPath, encrypter);
/**
* 此方法是修改源碼後添加,用以支持中文文件名
*/
zipFileEncrypter.setEncoding("utf8");
File sFile = new File(srcFile);
/**
* AesZipFileEncrypter提供了重載的添加Entry的方法,其中:
* add(File f, String passwd)
* 方法是將文件直接添加進壓縮文件
*
* add(File f, String pathForEntry, String passwd)
* 方法是按指定路徑將文件添加進壓縮文件
* pathForEntry - to be used for addition of the file (path within zip file)
*/
doZip(sFile, zipFileEncrypter, "", passwd);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
zipFileEncrypter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 具體壓縮方法,將給定文件添加進壓縮文件中,並處理壓縮文件中的路徑
* @param file 給定磁碟文件(是文件直接添加,是目錄遞歸調用添加)
* @param encrypter AesZipFileEncrypter實例,用於輸出加密ZIP文件
* @param pathForEntry ZIP文件中的路徑
* @param passwd 壓縮密碼
* @throws IOException
*/
private static void doZip(File file, AesZipFileEncrypter encrypter,
String pathForEntry, String passwd) throws IOException {
if (file.isFile()) {
pathForEntry += file.getName();
encrypter.add(file, pathForEntry, passwd);
return;
}
pathForEntry += file.getName() + File.separator;
for(File subFile : file.listFiles()) {
doZip(subFile, encrypter, pathForEntry, passwd);
}
}
/**
* 使用給定密碼解壓指定壓縮文件到指定目錄
* @param inFile 指定Zip文件
* @param outDir 解壓目錄
* @param passwd 解壓密碼
*/
public static void unzip(String inFile, String outDir, String passwd) {
File outDirectory = new File(outDir);
if (!outDirectory.exists()) {
outDirectory.mkdir();
}
AESDecrypter decrypter = new AESDecrypterBC();
AesZipFileDecrypter zipDecrypter = null;
try {
zipDecrypter = new AesZipFileDecrypter(new File(inFile), decrypter);
AesZipFileDecrypter.charset = "utf-8";
/**
* 得到ZIP文件中所有Entry,但此處好像與JDK里不同,目錄不視為Entry
* 需要創建文件夾,entry.isDirectory()方法同樣不適用,不知道是不是自己使用錯誤
* 處理文件夾問題處理可能不太好
*/
List<ExtZipEntry> entryList = zipDecrypter.getEntryList();
for(ExtZipEntry entry : entryList) {
String eName = entry.getName();
String dir = eName.substring(0, eName.lastIndexOf(File.separator) + 1);
File extractDir = new File(outDir, dir);
if (!extractDir.exists()) {
FileUtils.forceMkdir(extractDir);
}
/**
* 抽出文件
*/
File extractFile = new File(outDir + File.separator + eName);
zipDecrypter.extractEntry(entry, extractFile, passwd);
}
} catch (IOException e) {
e.printStackTrace();
} catch (DataFormatException e) {
e.printStackTrace();
} finally {
try {
zipDecrypter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 測試
* @param args
*/
public static void main(String[] args) {
/**
* 壓縮測試
* 可以傳文件或者目錄
*/
// zip("M:\\ZIP\\test\\bb\\a\\t.txt", "M:\\ZIP\\test\\temp1.zip", "zyh");
// zip("M:\\ZIP\\test\\bb", "M:\\ZIP\\test\\temp2.zip", "zyh");
unzip("M:\\ZIP\\test\\temp2.zip", "M:\\ZIP\\test\\temp", "zyh");
}
}
壓縮多個文件時,有兩個方法(第一種沒試):
(1) 預先把多個文件壓縮成zip,然後調用enc.addAll(inZipFile, password);方法將多個zip文件加進來。
(2)針對需要壓縮的文件循環調用enc.add(inFile, password);,每次都用相同的密碼。
④ java 什麼演算法壓縮文件最小
有三種方式實現java壓縮:
1、jdk自帶的包java.util.zip.ZipOutputStream,不足之處,文件(夾)名稱帶中文時,出現亂碼問題,實現代碼如下:
/**
* 功能:把 sourceDir 目錄下的所有文件進行 zip 格式的壓縮,保存為指定 zip 文件
* @param sourceDir 如果是目錄,eg:D:\\MyEclipse\\first\\testFile,則壓縮目錄下所有文件;
* 如果是文件,eg:D:\\MyEclipse\\first\\testFile\\aa.zip,則只壓縮本文件
* @param zipFile 最後壓縮的文件路徑和名稱,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 {
// 創建寫出流操作
OutputStream os = new FileOutputStream(zipFile);
BufferedOutputStream bos = new BufferedOutputStream(os);
zos = new ZipOutputStream(bos);
String basePath = null;
// 獲取目錄
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,代碼如下,
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) {
/* 判斷是目錄還是文件 */
if (file.isDirectory()) {
System.out.println("壓縮:" + basedir + file.getName());
this.compressDirectory(file, out, basedir);
} else {
System.out.println("壓縮:" + basedir + file.getName());
this.compressFile(file, out, basedir);
}
}
/** 壓縮一個目錄 */
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++) {
/* 遞歸 */
compress(files[i], out, basedir + dir.getName() + "/");
}
}
/** 壓縮一個文件 */
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來實現,更加簡單。
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夾 eg:zip.setIncludes("*.java");
//fileSet.setExcludes(...); 排除哪些文件或文件夾
zip.addFileset(fileSet);
zip.execute();
}
}
測試一下
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");
}
}
⑤ java 如何壓縮文件
樓主是說解壓了的文件大小隻有33.1MB,但是卻佔了51.2MB的空間嗎?
如果是這個意思的話,那我要告訴樓主,首先這個問題和JAVA沒有關系,根據你的截圖,可以斷定你用的是FAT32文件系統。這只是文件存儲的形式,很正常。
簡單的說,磁碟存儲數據的最小單位是簇,比方說你的簇大小為128K,一個簇只能存放一個文件,然後你的一個文件只有16K,它佔了這個簇,然後還有112K沒有用,是吧。但是那112K就不能再存放其它文件了。如果要存放其它文件,就要佔另一個簇。
樓主,懂了吧,這跟簇的大小有關,但是也不是簇越小越好,簇越小,讀寫性能都有所下降。這是正常現象。如果你非覺得不舒服,那就用NTFS文件系統吧,把壓縮打開,就不會有這種情況了,希望對你有幫助
⑥ java壓縮文件的問題
有三種方式實現java壓縮:
1、jdk自帶的包java.util.zip.ZipOutputStream,不足之處,文件(夾)名稱帶中文時,出現亂碼問題,實現代碼如下:
/**
* 功能:把 sourceDir 目錄下的所有文件進行 zip 格式的壓縮,保存為指定 zip 文件
* @param sourceDir 如果是目錄,eg:D:\\MyEclipse\\first\\testFile,則壓縮目錄下所有文件;
* 如果是文件,eg:D:\\MyEclipse\\first\\testFile\\aa.zip,則只壓縮本文件
* @param zipFile 最後壓縮的文件路徑和名稱,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 {
// 創建寫出流操作
OutputStream os = new FileOutputStream(zipFile);
BufferedOutputStream bos = new BufferedOutputStream(os);
zos = new ZipOutputStream(bos);
String basePath = null;
// 獲取目錄
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,代碼如下,
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) {
/* 判斷是目錄還是文件 */
if (file.isDirectory()) {
System.out.println("壓縮:" + basedir + file.getName());
this.compressDirectory(file, out, basedir);
} else {
System.out.println("壓縮:" + basedir + file.getName());
this.compressFile(file, out, basedir);
}
}
/** 壓縮一個目錄 */
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++) {
/* 遞歸 */
compress(files[i], out, basedir + dir.getName() + "/");
}
}
/** 壓縮一個文件 */
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來實現,更加簡單。
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夾 eg:zip.setIncludes("*.java");
//fileSet.setExcludes(...); 排除哪些文件或文件夾
zip.addFileset(fileSet);
zip.execute();
}
}
測試一下
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");
}
}
⑦ 求一個JAVA的壓縮程序源代碼。
package com.io2.homework;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/*壓縮文件夾*/
public class MyMultipleFileZip
{
private String currentZipFilePath = "F:/MyZip.zip";
private String sourceFilePath;
private ZipOutputStream zos;
private FileInputStream fis;
public MyMultipleFileZip(String sourceFilePath)
{
try
{
this.sourceFilePath = sourceFilePath;
zos = new ZipOutputStream(new FileOutputStream(currentZipFilePath));
//設定文件壓縮級別
zos.setLevel(9);
} catch (FileNotFoundException e)
{
e.printStackTrace();
}
}
// 在當前條目中寫入具體內容
public void writeToEntryZip(String filePath)
{
try
{
fis = new FileInputStream(filePath);
} catch (FileNotFoundException e1)
{
e1.printStackTrace();
}
byte[] buff = new byte[1024];
int len = 0;
try
{
while ((len = fis.read(buff)) != -1)
{
zos.write(buff, 0, len);
}
} catch (IOException e)
{
e.printStackTrace();
}finally
{
if (fis != null)
try
{
fis.close();
} catch (IOException e)
{
e.printStackTrace();
}
}
}
// 添加文件條目
public void addFileEntryZip(String fileName)
{
try
{
zos.putNextEntry(new ZipEntry(fileName));
} catch (IOException e)
{
e.printStackTrace();
}
}
public void addDirectoryEntryZip(String directoryName)
{
try
{
zos.putNextEntry(new ZipEntry(directoryName + "/"));
} catch (IOException e)
{
e.printStackTrace();
}
}
// 遍歷文件夾
public void listMyDirectory(String filePath)
{
File f = new File(filePath);
File[] files = f.listFiles();
if(files!=null)
{
for (File currentFile : files)
{
// 設置條目名稱(此步驟非常關鍵)
String entryName= currentFile.getAbsolutePath().split(":")[1].substring(1);
// 獲取文件物理路徑
String absolutePath = currentFile.getAbsolutePath();
if (currentFile.isDirectory())
{
addDirectoryEntryZip(entryName);
//進行遞歸調用
listMyDirectory(absolutePath);
}
else
{
addFileEntryZip(entryName);
writeToEntryZip(absolutePath);
}
}
}
}
// 主要流程
public void mainWorkFlow()
{
listMyDirectory(this.sourceFilePath);
if(zos!=null)
try
{
zos.close();
} catch (IOException e)
{
e.printStackTrace();
}
}
public static void main(String[] args)
{
new MyMultipleFileZip("F:/fountainDirectory").mainWorkFlow();
}
}
⑧ 如何使用JAVA代碼壓縮PDF文件
用java代碼壓縮應用到程序了,代碼一般是比較復雜的,對pdf文件的mate標簽優化,這類標簽包括三類,pdf文件不是網頁就是個文件,何況我們可以用pdf壓縮工具壓縮,下面有個解決方法,樓主可以做參照。
1:點擊打開工具,打開主頁面上有三個功能進行選擇,我們選擇pdf文件壓縮。
⑨ java如何實現多個文件的壓縮
importjava.util.*;
importjava.net.URI;
importjava.nio.file.Path;
importjava.nio.file.*;
publicclassZipFSPUser{
publicstaticvoidmain(String[]args)throwsThrowable{
Map<String,String>env=newHashMap<>();
env.put("create","true");
//
//definedinjava.net.JarURLConnection
URIuri=URI.create("jar:file:/codeSamples/zipfs/zipfstest.zip");
try(FileSystemzipfs=FileSystems.newFileSystem(uri,env)){
PathexternalTxtFile=Paths.get("/codeSamples/zipfs/SomeTextFile.txt");
PathpathInZipfile=zipfs.getPath("/SomeTextFile.txt");
//afileintothezipfile
Files.(externalTxtFile,pathInZipfile,
StandardCopyOption.REPLACE_EXISTING);
}
}
}
創建一個zip文件,並添加一個文件進去,需要JDK7
⑩ java編寫的代碼怎麼壓縮成zip文件
摘要 (1)可以壓縮文件,也可以壓縮文件夾