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java文件壓縮

發布時間: 2022-01-09 10:14:12

java將File壓縮成zip

ZipOutputStream zos = new ZipOutputStream(new FileOutputStream("d:\\test.zip"));
String test1="test1";
String test2="test2";
byte[] bytes1 = test1.getBytes("UTF-8");
byte[] bytes2 = test2.getBytes("UTF-8");

ZipEntry z1 = new ZipEntry("test1.txt");
zos.putNextEntry(z1);
zos.write(bytes1);
ZipEntry z2 = new ZipEntry("text2.txt");
zos.putNextEntry(z2);
zos.write(bytes2);
zos.closeEntry();
zos.close();

//流可以自己獲取

//java默認的包不支持中文(亂碼)

//使用apache的ZipOutputStream進行zip壓縮
是否可以解決您的問題?

❷ 如何使用java壓縮文件夾成為zip包(最簡單的

import java.io.File;

public class ZipCompressorByAnt {

private File zipFile;

/**
* 壓縮文件構造函數
* @param pathName 最終壓縮生成的壓縮文件:目錄+壓縮文件名.zip
*/
public ZipCompressorByAnt(String finalFile) {
zipFile = new File(finalFile);
}

/**
* 執行壓縮操作
* @param srcPathName 需要被壓縮的文件/文件夾
*/
public void compressExe(String srcPathName) {
System.out.println("srcPathName="+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();
}

}

public class TestZip {

public static void main(String[] args) {

ZipCompressorByAnt zca = new ZipCompressorByAnt("E:\test1.zip ");
zca.compressExe("E:\test1");
}

}

/*如果 出現ant 的 52 51 50 等版本問題 可以去找對應的ant-1.8.2.jar 我開始用的ant-1.10.1.jar 就是這個包版本高了 一直報verson 52 版本問題*/

❸ 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");
}
}

❹ java怎樣壓縮文件夾

壓縮文件夾代碼:
import java.io.File;
import org.apache.tools.zip.ZipOutputStream; //這個包在ant.jar里,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();
}
}
}

❺ java實現文件與文件夾壓縮

件夾又有文件與文件夾(下一個目錄里是文件),純java實現,要實

❻ 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[]){

}

}

❼ 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

❽ 怎樣用java快速實現zip文件的壓縮解壓縮

packagezip;
importjava.io.BufferedInputStream;
importjava.io.BufferedOutputStream;
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileOutputStream;
importjava.util.Enumeration;
importjava.util.zip.CRC32;
importjava.util.zip.CheckedOutputStream;
importjava.util.zip.ZipEntry;
importjava.util.zip.ZipFile;
importjava.util.zip.ZipOutputStream;
importorg.apache.commons.lang3.StringUtils;
publicclassZipUtil{

/**
*遞歸壓縮文件夾
*@paramsrcRootDir壓縮文件夾根目錄的子路徑
*@paramfile當前遞歸壓縮的文件或目錄對象
*@paramzos壓縮文件存儲對象
*@throwsException
*/
privatestaticvoidzip(StringsrcRootDir,Filefile,ZipOutputStreamzos)throwsException
{
if(file==null)
{
return;
}

//如果是文件,則直接壓縮該文件
if(file.isFile())
{
intcount,bufferLen=1024;
bytedata[]=newbyte[bufferLen];

//獲取文件相對於壓縮文件夾根目錄的子路徑
StringsubPath=file.getAbsolutePath();
intindex=subPath.indexOf(srcRootDir);
if(index!=-1)
{
subPath=subPath.substring(srcRootDir.length()+File.separator.length());
}
ZipEntryentry=newZipEntry(subPath);
zos.putNextEntry(entry);
BufferedInputStreambis=newBufferedInputStream(newFileInputStream(file));
while((count=bis.read(data,0,bufferLen))!=-1)
{
zos.write(data,0,count);
}
bis.close();
zos.closeEntry();
}
//如果是目錄,則壓縮整個目錄
else
{
//壓縮目錄中的文件或子目錄
File[]childFileList=file.listFiles();
for(intn=0;n<childFileList.length;n++)
{
childFileList[n].getAbsolutePath().indexOf(file.getAbsolutePath());
zip(srcRootDir,childFileList[n],zos);
}
}
}

/**
*對文件或文件目錄進行壓縮
*@paramsrcPath要壓縮的源文件路徑。如果壓縮一個文件,則為該文件的全路徑;如果壓縮一個目錄,則為該目錄的頂層目錄路徑
*@paramzipPath壓縮文件保存的路徑。注意:zipPath不能是srcPath路徑下的子文件夾
*@paramzipFileName壓縮文件名
*@throwsException
*/
publicstaticvoidzip(StringsrcPath,StringzipPath,StringzipFileName)throwsException
{
if(StringUtils.isEmpty(srcPath)||StringUtils.isEmpty(zipPath)||StringUtils.isEmpty(zipFileName))
{
thrownewParameterException(ICommonResultCode.PARAMETER_IS_NULL);
}
CheckedOutputStreamcos=null;
ZipOutputStreamzos=null;
try
{
FilesrcFile=newFile(srcPath);

//判斷壓縮文件保存的路徑是否為源文件路徑的子文件夾,如果是,則拋出異常(防止無限遞歸壓縮的發生)
if(srcFile.isDirectory()&&zipPath.indexOf(srcPath)!=-1)
{
thrownewParameterException(ICommonResultCode.INVALID_PARAMETER,".");
}

//判斷壓縮文件保存的路徑是否存在,如果不存在,則創建目錄
FilezipDir=newFile(zipPath);
if(!zipDir.exists()||!zipDir.isDirectory())
{
zipDir.mkdirs();
}

//創建壓縮文件保存的文件對象
StringzipFilePath=zipPath+File.separator+zipFileName;
FilezipFile=newFile(zipFilePath);
if(zipFile.exists())
{
//檢測文件是否允許刪除,如果不允許刪除,將會拋出SecurityException
=newSecurityManager();
securityManager.checkDelete(zipFilePath);
//刪除已存在的目標文件
zipFile.delete();
}

cos=newCheckedOutputStream(newFileOutputStream(zipFile),newCRC32());
zos=newZipOutputStream(cos);

//如果只是壓縮一個文件,則需要截取該文件的父目錄
StringsrcRootDir=srcPath;
if(srcFile.isFile())
{
intindex=srcPath.lastIndexOf(File.separator);
if(index!=-1)
{
srcRootDir=srcPath.substring(0,index);
}
}
//調用遞歸壓縮方法進行目錄或文件壓縮
zip(srcRootDir,srcFile,zos);
zos.flush();
}
catch(Exceptione)
{
throwe;
}
finally
{
try
{
if(zos!=null)
{
zos.close();
}
}
catch(Exceptione)
{
e.printStackTrace();
}
}
}

/**
*解壓縮zip包
*@paramzipFilePathzip文件的全路徑
*@paramunzipFilePath解壓後的文件保存的路徑
*@paramincludeZipFileName解壓後的文件保存的路徑是否包含壓縮文件的文件名。true-包含;false-不包含
*/
@SuppressWarnings("unchecked")
publicstaticvoinzip(StringzipFilePath,StringunzipFilePath,booleanincludeZipFileName)throwsException
{
if(StringUtils.isEmpty(zipFilePath)||StringUtils.isEmpty(unzipFilePath))
{
thrownewParameterException(ICommonResultCode.PARAMETER_IS_NULL);
}
FilezipFile=newFile(zipFilePath);
//如果解壓後的文件保存路徑包含壓縮文件的文件名,則追加該文件名到解壓路徑
if(includeZipFileName)
{
StringfileName=zipFile.getName();
if(StringUtils.isNotEmpty(fileName))
{
fileName=fileName.substring(0,fileName.lastIndexOf("."));
}
unzipFilePath=unzipFilePath+File.separator+fileName;
}
//創建解壓縮文件保存的路徑
FileunzipFileDir=newFile(unzipFilePath);
if(!unzipFileDir.exists()||!unzipFileDir.isDirectory())
{
unzipFileDir.mkdirs();
}

//開始解壓
ZipEntryentry=null;
StringentryFilePath=null,entryDirPath=null;
FileentryFile=null,entryDir=null;
intindex=0,count=0,bufferSize=1024;
byte[]buffer=newbyte[bufferSize];
BufferedInputStreambis=null;
BufferedOutputStreambos=null;
ZipFilezip=newZipFile(zipFile);
Enumeration<ZipEntry>entries=(Enumeration<ZipEntry>)zip.entries();
//循環對壓縮包里的每一個文件進行解壓
while(entries.hasMoreElements())
{
entry=entries.nextElement();
//構建壓縮包中一個文件解壓後保存的文件全路徑
entryFilePath=unzipFilePath+File.separator+entry.getName();
//構建解壓後保存的文件夾路徑
index=entryFilePath.lastIndexOf(File.separator);
if(index!=-1)
{
entryDirPath=entryFilePath.substring(0,index);
}
else
{
entryDirPath="";
}
entryDir=newFile(entryDirPath);
//如果文件夾路徑不存在,則創建文件夾
if(!entryDir.exists()||!entryDir.isDirectory())
{
entryDir.mkdirs();
}

//創建解壓文件
entryFile=newFile(entryFilePath);
if(entryFile.exists())
{
//檢測文件是否允許刪除,如果不允許刪除,將會拋出SecurityException
=newSecurityManager();
securityManager.checkDelete(entryFilePath);
//刪除已存在的目標文件
entryFile.delete();
}

//寫入文件
bos=newBufferedOutputStream(newFileOutputStream(entryFile));
bis=newBufferedInputStream(zip.getInputStream(entry));
while((count=bis.read(buffer,0,bufferSize))!=-1)
{
bos.write(buffer,0,count);
}
bos.flush();
bos.close();
}
}

publicstaticvoidmain(String[]args)
{
StringzipPath="d:\ziptest\zipPath";
Stringdir="d:\ziptest\rawfiles";
StringzipFileName="test.zip";
try
{
zip(dir,zipPath,zipFileName);
}
catch(Exceptione)
{
e.printStackTrace();
}

StringzipFilePath="D:\ziptest\zipPath\test.zip";
StringunzipFilePath="D:\ziptest\zipPath";
try
{
unzip(zipFilePath,unzipFilePath,true);
}
catch(Exceptione)
{
e.printStackTrace();
}
}
}

❾ 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

❿ java 怎麼把文件壓縮

用Eclipse可以將java文件打成.jar包,再用exe4打成exe文件,不過exe4貌似不是免費的,打成jar包的具體過程是File->Export->java->jar file->next->選擇工程中的java文件->下面選擇jar包的路徑->next->main class禮選擇主類->finish,就ok 了,注意,只有你的機子上安裝了jre/jdk之後打出來的才是jar包,直接點擊才能運行,不然打出來的是壓縮包,也就是說jar包只有在裝了java運行環境的機子上才可以運行

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