java文件夾壓縮文件
❶ java中將一個文件夾下所有的文件壓縮成一個文件,然後,解壓到指定目錄.
import java.io.*;
import java.util.zip.*;
public class CompressD {
// 緩沖
static byte[] buffer = new byte[2048];
public static void main(String[] args) throws Exception {
// 來源
File inputDir = new File("C:\\CompressTest\\");
// 目標
FileOutputStream fos = new FileOutputStream("C:\\CompressTest.zip");
// 過濾
ZipOutputStream zos = new ZipOutputStream(fos);
// 壓縮
zip(inputDir.listFiles(), "", zos);
// 關閉
zos.close();
}
private static void zip(File[] files, String baseFolder, ZipOutputStream zos)
throws Exception {
// 輸入
FileInputStream fis = null;
// 條目
ZipEntry entry = null;
// 數目
int count = 0;
for (File file : files) {
if (file.isDirectory()) {
// 遞歸
zip(file.listFiles(), file.getName() + File.separator, zos);
continue;
}
entry = new ZipEntry(baseFolder + file.getName());
// 加入
zos.putNextEntry(entry);
fis = new FileInputStream(file);
// 讀取
while ((count = fis.read(buffer, 0, buffer.length)) != -1)
// 寫入
zos.write(buffer, 0, count);
}
}
}
❷ 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
❸ java 關於壓縮文件夾的問題
//建立路徑這里 不是很明白
out.putNextEntry(new org.apache.tools.zip.ZipEntry(base + "/"));
base = base.length() == 0 ? "" : base + "/";
要保留zip裡面的目錄結構，所以，是先放入當前目錄及上層所有目錄
❹ 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");
}
}
❺ 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");
}
}
❻ java怎麼實現遍歷文件夾並壓縮的功能
不考慮一個文件夾下有另外一個文件夾的情況下，代碼如下
publicstaticvoidZipFolder(Filedirectory)throwsException{
FileOutputStreamfout=newFileOutputStream("輸出壓縮文件test.zip的位置");
ZipOutputStreamzout=newZipOutputStream(fout);
for(Filefile:directory.listFiles()){
byte[]buffer=Files.readAllBytes(file.toPath());
ZipEntryzipEntry=newZipEntry(file.getName());
zout.putNextEntry(zipEntry);
zout.write(buffer);
zout.closeEntry();
}
zout.flush();
zout.close();
}
❼ 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*/
❽ 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
❾ 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
❿ 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();
}
}
}