java創建包

Ⅰ 如何在java里包中建包

第一步：在需要創建包的路徑上右擊，選擇」new「，之後選擇」package「；

Ⅱ 如何用java創建一個加密的壓縮包

下面的示例代碼演示如何創建zip壓縮包。
首先需要由需要壓縮的文件創建一個InputStream對象，然後讀取文件內容寫入到ZipOutputStream中。
ZipOutputStream類接受FileOutputStream作為參數。創建號ZipOutputStream對象後需要創建一個zip entry，然後寫入。

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
*
* @author outofmemory.cn
*/
public class Main {

/**
* Creates a zip file
*/

public void createZipFile() {

try {
String inputFileName = "test.txt";
String zipFileName = "compressed.zip";

//Create input and output streams
FileInputStream inStream = new FileInputStream(inputFileName);
ZipOutputStream outStream = new ZipOutputStream(new FileOutputStream(zipFileName));

// Add a zip entry to the output stream
outStream.putNextEntry(new ZipEntry(inputFileName));

byte[] buffer = new byte[1024];
int bytesRead;

//Each chunk of data read from the input stream
//is written to the output stream
while ((bytesRead = inStream.read(buffer)) > 0) {
outStream.write(buffer, 0, bytesRead);
}

//Close zip entry and file streams
outStream.closeEntry();

outStream.close();
inStream.close();

} catch (IOException ex) {
ex.printStackTrace();
}
}

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new Main().createZipFile();
}