void putNextEntry(ZipEntry e)

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2023-12-01

描述 (Description)

java.util.zip.ZipOutputStream.putNextEntry(ZipEntry e)方法开始编写新的ZIP文件条目,并将流定位到条目数据的开头。 如果仍然有效,则关闭当前条目。 如果没有为条目指定压缩方法,则将使用默认压缩方法,如果条目没有设置修改时间,则将使用当前时间。

声明 (Declaration)

以下是java.util.zip.ZipOutputStream.putNextEntry(ZipEntry e)方法的声明。

public void putNextEntry(ZipEntry e)
   throws IOException

参数 (Parameters)

  • e - 要写入的ZIP条目。

异常 (Exceptions)

  • ZipException - 如果发生ZIP文件错误。

  • IOException - 如果发生I/O错误。

先决条件

D:》 test 》目录中创建一个文件Hello.txt,其中包含以下内容。

This is an example.

例子 (Example)

以下示例显示了java.util.zip.ZipOutputStream.putNextEntry(ZipEntry e)方法的用法。

package cn.xnip;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.zip.Adler32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
public class ZipOutputStreamDemo {
   private static String SOURCE_FILE = "D:\\test\\Hello.txt";
   private static String TARGET_FILE = "D:\\test\\Hello.zip";
   public static void main(String[] args) {
      try {
         createZipFile();
         readZipFile();
      } catch(IOException ioe) {
         System.out.println("IOException : " + ioe);
      }
   }
   private static void createZipFile() throws IOException{
      FileOutputStream fout = new FileOutputStream(TARGET_FILE);
      CheckedOutputStream checksum = new CheckedOutputStream(fout, new Adler32());
      ZipOutputStream zout = new ZipOutputStream(checksum);
      FileInputStream fin = new FileInputStream(SOURCE_FILE);
      ZipEntry zipEntry = new ZipEntry(SOURCE_FILE);
      zout.putNextEntry(zipEntry);
      int length;
      byte[] buffer = new byte[1024];
      while((length = fin.read(buffer)) > 0) {
         zout.write(buffer, 0, length);
      }
      zout.closeEntry();
      zout.finish();
      fin.close();
      zout.close();
   }
   private static void readZipFile() throws IOException{
      ZipInputStream zin = new ZipInputStream(new FileInputStream(TARGET_FILE)); 
      ZipEntry entry;
      while((entry = zin.getNextEntry())!=null){
         System.out.printf("File: %s Modified on %TD %n", 
         entry.getName(), new Date(entry.getTime()));
         extractFile(entry, zin); 
         System.out.printf("Zip file %s extracted successfully.", SOURCE_FILE);
         zin.closeEntry();
      }
      zin.close();
   }
   private static void extractFile(final ZipEntry entry, ZipInputStream is) 
      throws IOException {
      FileOutputStream fos = null; 
      try { 
         fos = new FileOutputStream(entry.getName()); 
         while(is.available() != 0){
            fos.write(is.read()); 
         }
      } catch (IOException ioex) { 
         fos.close(); 
      } 
   }
}

让我们编译并运行上面的程序,这将产生以下结果 -

Zip File: D:\test\Hello.zip, Contains 1 file(s). 
File: D:\test\Hello.txt Size 1026 Modified on 05/22/17 
Zip file D:\test\Hello.txt extracted successfully.