Java 临时使用zip4j提取文件。（为读取而提取，但在缓存文件中不可见）
我正在使用zip4j&打包和解压缩工作，但我很好奇如何只解压缩文件而不将文件放入缓存 下面是我在另一个线程上找到的一些代码：Java 临时使用zip4j提取文件。（为读取而提取，但在缓存文件中不可见）,java,eclipse,desktop,Java,Eclipse,Desktop,我正在使用zip4j&打包和解压缩工作，但我很好奇如何只解压缩文件而不将文件放入缓存 下面是我在另一个线程上找到的一些代码： public static void main() { String source = "C:\\Users\\gamecaching\\Cache.zip"; String destination = "C:\\Users\\gamecaching\\"; String password = "mypassword"; try {
public static void main() {
String source = "C:\\Users\\gamecaching\\Cache.zip";
String destination = "C:\\Users\\gamecaching\\";
String password = "mypassword";
try {
ZipFile zipFile = new ZipFile(source);
if (zipFile.isEncrypted()) {
zipFile.setPassword(password);
}
zipFile.extractAll(destination);
} catch (ZipException e) {
e.printStackTrace();
}
}
如何使其仅在程序运行时提取（&&extracted files not visible in directory）并在程序退出后删除 要读取zip文件的具体条目，请使用：
zipFile.getInputStream（FileHeader）for (FileHeader entry: zipFile:getFileHeaders()){
zipFile.getInputStream(FileHeader);
}
创建ZipFile之后
ZipFile zipFile = new ZipFile(source);
ArrayList fileHeaderList = zipFile.getFileHeaders();
for (int i = 0; i < fileHeaderList.size(); i++) {
FileHeader fileHeader = (FileHeader)fileHeaderList.get(i);
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import net.lingala.zip4j.core.ZipFile;
import net.lingala.zip4j.exception.ZipException;
import net.lingala.zip4j.io.ZipInputStream;
import net.lingala.zip4j.model.FileHeader;
import net.lingala.zip4j.unzip.UnzipUtil;
/**
* Example demonstrating the use of InputStreams to extract files from the
* ZipFile
*/
public class ExtractAllFilesWithInputStreams {
private final int BUFF_SIZE = 4096;
public ExtractAllFilesWithInputStreams() {
ZipInputStream is = null;
OutputStream os = null;
try {
// Initiate the ZipFile
ZipFile zipFile = new ZipFile(
"C:\\ZipTest\\ExtractAllFilesWithInputStreams.zip");
String destinationPath = "c:\\ZipTest";
// If zip file is password protected then set the password
if (zipFile.isEncrypted()) {
zipFile.setPassword("password");
}
// Get a list of FileHeader. FileHeader is the header information
// for all the files in the ZipFile
List fileHeaderList = zipFile.getFileHeaders();
// Loop through all the fileHeaders
for (int i = 0; i < fileHeaderList.size(); i++) {
FileHeader fileHeader = (FileHeader) fileHeaderList.get(i);
if (fileHeader != null) {
// Build the output file
String outFilePath = destinationPath
+ System.getProperty("file.separator")
+ fileHeader.getFileName();
File outFile = new File(outFilePath);
// Checks if the file is a directory
if (fileHeader.isDirectory()) {
// This functionality is up to your requirements
// For now I create the directory
outFile.mkdirs();
continue;
}
// Check if the directories(including parent directories)
// in the output file path exists
File parentDir = outFile.getParentFile();
if (!parentDir.exists()) {
parentDir.mkdirs();
}
// Get the InputStream from the ZipFile
is = zipFile.getInputStream(fileHeader);
// Initialize the output stream
os = new FileOutputStream(outFile);
int readLen = -1;
byte[] buff = new byte[BUFF_SIZE];
// Loop until End of File and write the contents to the
// output stream
while ((readLen = is.read(buff)) != -1) {
os.write(buff, 0, readLen);
}
// Please have a look into this method for some important
// comments
closeFileHandlers(is, os);
// To restore File attributes (ex: last modified file time,
// read only flag, etc) of the extracted file, a utility
// class can be used as shown below
UnzipUtil.applyFileAttributes(fileHeader, outFile);
System.out.println("Done extracting: "
+ fileHeader.getFileName());
} else {
System.err.println("fileheader is null. Shouldn't be here");
}
}
} catch (ZipException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
closeFileHandlers(is, os);
} catch (IOException e) {
e.printStackTrace();
}
}
}
private void closeFileHandlers(ZipInputStream is, OutputStream os)
throws IOException {
// Close output stream
if (os != null) {
os.close();
os = null;
}
// Closing inputstream also checks for CRC of the the just extracted
// file. If CRC check has to be skipped (for ex: to cancel the unzip
// operation, etc) use method is.close(boolean skipCRCCheck) and set the
// flag, skipCRCCheck to false
// NOTE: It is recommended to close outputStream first because Zip4j
// throws an exception if CRC check fails
if (is != null) {
is.close();
is = null;
}
}
public static void main(String[] args) {
new ExtractAllFilesWithInputStreams();
}
}
导入java.io.File；
导入java.io.FileNotFoundException；
导入java.io.FileOutputStream；
导入java.io.IOException；
导入java.io.OutputStream；
导入java.util.List；
导入net.lingala.zip4j.core.ZipFile；
导入net.lingala.zip4j.exception.zipeexception；
导入net.lingala.zip4j.io.ZipInputStream；
导入net.lingala.zip4j.model.FileHeader；
导入net.lingala.zip4j.unzip.UnzipUtil；
/**
*示例演示如何使用InputStreams从
*拉链
*/
公共类ExtractAllFilesWithInputStreams{
私人最终整容BUFF_SIZE=4096；
public ExtractAllFilesWithInputStreams（）{
ZipInputStream=null；
OutputStream os=null；
试一试{
//启动拉链
ZipFile ZipFile=新ZipFile(
“C:\\ZipTest\\extractalfileswithInputStreams.zip”）；
字符串destinationPath=“c:\\ZipTest”；
//如果zip文件受密码保护，则设置密码
if（zipFile.isEncrypted（））{
zipFile.setPassword（“密码”）；
}
//获取FileHeader的列表。FileHeader是标头信息
//对于ZipFile中的所有文件
List fileHeaderList=zipFile.getFileHeaders（）；
//循环遍历所有文件头
对于（int i=0；iimport java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import net.lingala.zip4j.core.ZipFile;
import net.lingala.zip4j.exception.ZipException;
import net.lingala.zip4j.io.ZipInputStream;
import net.lingala.zip4j.model.FileHeader;
import net.lingala.zip4j.unzip.UnzipUtil;
/**
* Example demonstrating the use of InputStreams to extract files from the
* ZipFile
*/
public class ExtractAllFilesWithInputStreams {
private final int BUFF_SIZE = 4096;
public ExtractAllFilesWithInputStreams() {
ZipInputStream is = null;
OutputStream os = null;
try {
// Initiate the ZipFile
ZipFile zipFile = new ZipFile(
"C:\\ZipTest\\ExtractAllFilesWithInputStreams.zip");
String destinationPath = "c:\\ZipTest";
// If zip file is password protected then set the password
if (zipFile.isEncrypted()) {
zipFile.setPassword("password");
}
// Get a list of FileHeader. FileHeader is the header information
// for all the files in the ZipFile
List fileHeaderList = zipFile.getFileHeaders();
// Loop through all the fileHeaders
for (int i = 0; i < fileHeaderList.size(); i++) {
FileHeader fileHeader = (FileHeader) fileHeaderList.get(i);
if (fileHeader != null) {
// Build the output file
String outFilePath = destinationPath
+ System.getProperty("file.separator")
+ fileHeader.getFileName();
File outFile = new File(outFilePath);
// Checks if the file is a directory
if (fileHeader.isDirectory()) {
// This functionality is up to your requirements
// For now I create the directory
outFile.mkdirs();
continue;
}
// Check if the directories(including parent directories)
// in the output file path exists
File parentDir = outFile.getParentFile();
if (!parentDir.exists()) {
parentDir.mkdirs();
}
// Get the InputStream from the ZipFile
is = zipFile.getInputStream(fileHeader);
// Initialize the output stream
os = new FileOutputStream(outFile);
int readLen = -1;
byte[] buff = new byte[BUFF_SIZE];
// Loop until End of File and write the contents to the
// output stream
while ((readLen = is.read(buff)) != -1) {
os.write(buff, 0, readLen);
}
// Please have a look into this method for some important
// comments
closeFileHandlers(is, os);
// To restore File attributes (ex: last modified file time,
// read only flag, etc) of the extracted file, a utility
// class can be used as shown below
UnzipUtil.applyFileAttributes(fileHeader, outFile);
System.out.println("Done extracting: "
+ fileHeader.getFileName());
} else {
System.err.println("fileheader is null. Shouldn't be here");
}
}
} catch (ZipException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
closeFileHandlers(is, os);
} catch (IOException e) {
e.printStackTrace();
}
}
}
private void closeFileHandlers(ZipInputStream is, OutputStream os)
throws IOException {
// Close output stream
if (os != null) {
os.close();
os = null;
}
// Closing inputstream also checks for CRC of the the just extracted
// file. If CRC check has to be skipped (for ex: to cancel the unzip
// operation, etc) use method is.close(boolean skipCRCCheck) and set the
// flag, skipCRCCheck to false
// NOTE: It is recommended to close outputStream first because Zip4j
// throws an exception if CRC check fails
if (is != null) {
is.close();
is = null;
}
}
public static void main(String[] args) {
new ExtractAllFilesWithInputStreams();
}
}
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.lingala.zip4j.core.ZipFile;
import net.lingala.zip4j.exception.ZipException;
import net.lingala.zip4j.io.ZipInputStream;
import net.lingala.zip4j.model.FileHeader;
public class StackoverFlow18974389 {
public static void main(String[] args) {
Map<String, InputStream> inMemoryFiles = new HashMap<>();
try {
ZipFile zipFile = new ZipFile("test.zip");
List fileHeaderList = zipFile.getFileHeaders();
for (int i = 0; i < fileHeaderList.size(); i++) {
FileHeader fileHeader = (FileHeader) fileHeaderList.get(i);
ZipInputStream is = zipFile.getInputStream(fileHeader);
int uncompressedSize = (int) fileHeader.getUncompressedSize();
OutputStream os = new ByteArrayOutputStream(uncompressedSize);
int bytesRead;
byte[] buffer = new byte[4096];
while ((bytesRead = is.read(buffer)) != -1) {
os.write(buffer, 0, bytesRead);
}
byte[] uncompressedBytes = ((ByteArrayOutputStream) os).toByteArray();
inMemoryFiles.put(fileHeader.getFileName(), new ByteArrayInputStream(uncompressedBytes));
is.close();
}
} catch (ZipException | IOException ex) {
ex.printStackTrace(System.err);
}
// very simple example how to access the files from the map
for (String fileName : inMemoryFiles.keySet()) {
System.out.print("in memory file: " + fileName);
InputStream is = new BufferedInputStream(inMemoryFiles.get(fileName));
long length = 0;
try {
while (is.read() != -1) {
length++;
}
} catch (IOException ex) {
ex.printStackTrace(System.err);
}
System.out.println(" size. " + length);
}
}
}
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import net.lingala.zip4j.core.ZipFile;
import net.lingala.zip4j.exception.ZipException;
import net.lingala.zip4j.io.ZipInputStream;
import net.lingala.zip4j.model.FileHeader;
import org.apache.commons.io.output.NullOutputStream;
/**
* Example demonstrating testing Zip files using net.lingala.zip4j
*
* Changes:
* - Created static method testZipFile
* - Uses Buffered IO
* - Uses Apache Commons' NullOutputStream() for /dev/null
* - Uses enhanced for loop
* - Skip CRC check
* - Removed unapplicable code
*/
public class Zip4jTestZipFile
{
public static void main(String[] args)
{
File zipfile = new File("D:\\JDeveloper\\mywork\\Gas_Market_Systems\\GMS-FLISTCopy\\test\\inetpub\\tmp.lem\\FLIST_COUNTRYNWO_20140411.zip");
testZipFile(zipfile);
}
/* Adapted from SrikanthLingala's answer (http://stackoverflow.com/a/18974782/1213722) */
public static void testZipFile(File zipfile) {
ZipInputStream is = null;
OutputStream os = new NullOutputStream(); // org.apache.commons.io.output.NullOutputStream
/* Buffered IO */
BufferedInputStream bis = null;
BufferedOutputStream bos = new BufferedOutputStream(os);
try {
// Initiate the ZipFile
ZipFile zipFile = new ZipFile(zipfile);
// If zip file is password protected then set the password
if (zipFile.isEncrypted()) {
zipFile.setPassword("password");
}
// Get a list of FileHeader. FileHeader is the header information
// for all the files in the ZipFile
List<FileHeader> fileHeaderList = zipFile.getFileHeaders();
// Loop through all the fileHeaders
for (FileHeader fileHeader : fileHeaderList) {
if (fileHeader != null) {
// Removed: Build the output file
// Removed: directory checks
// Removed: parent directory checks
// Get the InputStream from the ZipFile
is = zipFile.getInputStream(fileHeader);
bis = new BufferedInputStream(is);
// Removed: Initialize the output stream
int readLen = -1;
// Loop until End of File and write the contents to the
// output stream
while ((readLen = bis.read()) != -1)
{
bos.write(readLen);
}
// Please have a look into this method for some important
// comments
closeFileHandlers(is, os);
// Removed: restore File attributes
System.out.println("Done testing: "
+ fileHeader.getFileName());
} else {
System.err.println("fileheader is null. Shouldn't be here");
}
}
} catch (ZipException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
closeFileHandlers(is, os);
} catch (IOException e) {
e.printStackTrace();
}
}
}
private static void closeFileHandlers(ZipInputStream is, OutputStream os)
throws IOException {
// Close output stream
if (os != null) {
os.close();
os = null;
}
// Closing inputstream also checks for CRC of the the just extracted
// file. If CRC check has to be skipped (for ex: to cancel the unzip
// operation, etc) use method is.close(boolean skipCRCCheck) and set the
// flag, skipCRCCheck to false
// NOTE: It is recommended to close outputStream first because Zip4j
// throws an exception if CRC check fails
if (is != null) {
// is.close();
boolean skipCRCCheck = false;
is.close(skipCRCCheck);
is = null;
}
}
}