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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