不确定我应该怎么做。任何帮助将不胜感激
答案 0 :(得分:24)
从输入流中读取并写入ByteArrayOutputStream,然后调用其toByteArray()
以获取字节数组。
在字节数组周围创建ByteArrayInputStream以从中读取。
这是一个快速测试:
import java.io.*;
public class Test {
public static void main(String[] arg) throws Throwable {
File f = new File(arg[0]);
InputStream in = new FileInputStream(f);
byte[] buff = new byte[8000];
int bytesRead = 0;
ByteArrayOutputStream bao = new ByteArrayOutputStream();
while((bytesRead = in.read(buff)) != -1) {
bao.write(buff, 0, bytesRead);
}
byte[] data = bao.toByteArray();
ByteArrayInputStream bin = new ByteArrayInputStream(data);
System.out.println(bin.available());
}
}
答案 1 :(得分:3)
或者首先将其转换为字节数组,然后转换为bytearrayinputstream。
File f = new File(arg[0]);
InputStream in = new FileInputStream(f);
// convert the inpustream to a byte array
byte[] buf = null;
try {
buf = new byte[in.available()];
while (in.read(buf) != -1) {
}
} catch (Exception e) {
System.out.println("Got exception while is -> bytearr conversion: " + e);
}
// now convert it to a bytearrayinputstream
ByteArrayInputStream bin = new ByteArrayInputStream(buf);
答案 2 :(得分:2)
您可以使用org.apache.commons.io。 IOUtils#toByteArray (java.io.InputStream)
InputStream is = getMyInputStream();
ByteArrayInputStream bais = new ByteArrayInputStream(IOUtils.toByteArray(is));