java.util.zip.ZipInputStream read()方法

java.util.zip.ZipInputStream read()方法 介绍

java.util.zip.ZipInputStream.read(byte[] buf, int off, int len) 方法从当前ZIP进入字节数组读取。如果 len 不为零,则该方法将阻塞,直到某些输入可用;否则,不读取任何字节并返回 0。

java.util.zip.ZipInputStream read()方法 声明

public int read(byte[] buf, int off, int len)
   throws IOException
  • buf : 读取数据的缓冲区。

  • off : 目标数组 b 中的起始偏移量。

  • len :读取的最大字节数。

返回值:读取的实际字节数,如果到达流的末尾,则为 -1。

java.util.zip.ZipInputStream read()方法 示例

下面的例子展示了 java.util.zip.ZipInputStream.read()方法的用法。

在D:> test >目录下创建一个文件 Hello.txt ,内容如下:

欢迎访问一点教程网

编写代码

package com.yiidian;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.zip.*;

public class ZipInputStreamDemo {
   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();
      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()); 
         final byte[] buf = new byte[1024]; 
         int read = 0; 
         int length; 
         while ((length = is.read(buf, 0, buf.length)) >= 0) { 
            fos.write(buf, 0, length); 
         } 
      } catch (IOException ioex) { 
         fos.close(); 
      } 
   }
}

输出结果为:

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