以下示例显示了如何从Java中的FileInputStream读取字节。
import java.io.File;import java.io.FileInputStream;public class fileInputStream {
public static void main(String[] args) {
byte[] data = new byte[1024]; //allocates memory for 1024 bytes
//be careful about how to declare an array in Java
int readBytes;
try {
File file = new File("testfile");
file.createNewFile();
FileInputStream in = new FileInputStream(file);
while ((readBytes = in.read(data)) != -1) {
//read(byte[] b)
//Reads some number of bytes from the input stream and stores them into the buffer array b.
System.out.println("read " + readBytes + " bytes, and placed them into temp array named data");
System.out.println("data :" + data[123]);
}
in.close();
} catch (Exception e) {
e.printStackTrace();
}
}}
如果放置一些数据，它将给出以下输出：
run:
read 1024 bytes, and placed them into temp array named data
read 1024 bytes, and placed them into temp array named data
read 1024 bytes, and placed them into temp array named data
read 1024 bytes, and placed them into temp array named data
read 1024 bytes, and placed them into temp array named data
read 1024 bytes, and placed them into temp array named data
read 952 bytes, and placed them into temp array named data
BUILD SUCCESSFUL (total time: 2 seconds)
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