创建 ZipFile 后
ZipFile zipFile = new ZipFile(source);
您可以像这样遍历 zip 文件中的每个文件：
ArrayList fileHeaderList = zipFile.getFileHeaders();
对于每个 ZipFile：
for (int i = 0; i < fileHeaderList.size(); i++) {
FileHeader fileHeader = (FileHeader)fileHeaderList.get(i);
然后，您可以通过执行此操作获取 inputStream
is = zipFile.getInputStream(fileHeader);
现在您可以读取 InputStream。
下面是一个使用 Streams 的综合示例（取自Zip4j 示例包。）虽然这个示例仍然写入文件，但它演示了对 zip 文件使用流。我建议在示例包中查看更多示例。
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();
}
}