byte[]和InputStream的相互转换

转自：http://javapub.iteye.com/blog/665696

1. byte[]转换为InputStream

InputStream sbs = new ByteArrayInputStream(byte[] buf); 

2. InputStream转换为InputStreambyte[]

ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
byte[] buff = new byte[100]; //buff用于存放循环读取的临时数据
int rc = 0;
while ((rc = inStream.read(buff, 0, 100)) > 0) {
　　swapStream.write(buff, 0, rc);
}
byte[] in_b = swapStream.toByteArray(); //in_b为转换之后的结果 

代码：

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class ByteToInputStream {

    public static final InputStream byte2Input(byte[] buf) {
        return new ByteArrayInputStream(buf);
    }

    public static final byte[] input2byte(InputStream inStream)
            throws IOException {
        ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
        byte[] buff = new byte[100];
        int rc = 0;
        while ((rc = inStream.read(buff, 0, 100)) > 0) {
            swapStream.write(buff, 0, rc);
        }
        byte[] in2b = swapStream.toByteArray();
        return in2b;
    }

}