java.util.zip.CheckedInputStream.read()
方法返回此输入流的校验和。
声明
以下是java.util.zip.CheckedInputStream.read()
方法的声明。
public int read()
throws IOException
返回值
- 返回读取的字节,如果到达流的末尾,则返回
-1
。
前提条件
在D:\test> 目录下用以下内容创建一个文件Hello.txt
。
This is an example.
示例
以下示例显示了java.util.zip.CheckedInputStream.read()
方法的用法。
package com.yiibai;
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());
while(checksum.read() >= 0){
}
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();
}
}
执行上面示例代码,得到以下结果 -
Checksum: 1400120861