long skip(long n)
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小牛编辑
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2023-12-01
描述 (Description)
java.util.zip.CheckedInputStream.skip(long n)方法跳过指定的输入字节数。
声明 (Declaration)
以下是java.util.zip.CheckedInputStream.skip(long n)方法的声明。
public long skip(long n)
throws IOException
参数 (Parameters)
n - 要跳过的字节数。
返回值 (Returns)
跳过的实际字节数。
异常 (Exceptions)
IOException - 如果发生I/O错误。
先决条件
在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.CheckedInputStream.skip(long n)方法的用法。
package cn.xnip;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
public class CheckedInputStreamDemo {
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();
FileInputStream fin= new FileInputStream(TARGET_FILE);
CheckedInputStream checksum = new CheckedInputStream(fin, new Adler32());
byte[] buffer = new byte[1024];
checksum.skip(buffer.length);
System.out.println("Checksum: " + checksum.getChecksum().getValue());
} 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);
zout.putNextEntry(new ZipEntry(SOURCE_FILE));
int length;
byte[] buffer = new byte[1024];
while((length = fin.read(buffer)) > 0) {
zout.write(buffer, 0, length);
}
zout.closeEntry();
fin.close();
zout.close();
}
}
让我们编译并运行上面的程序,这将产生以下结果 -
Checksum: 1400120861