Java 将 InputStream(Image) 转换为 ByteArrayInputStream
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Convert InputStream(Image) to ByteArrayInputStream
提问by user398371
Not sure about how I am supposed to do this. Any help would be appreciated
不确定我应该如何做到这一点。任何帮助，将不胜感激
采纳答案by naikus
Read from input stream and write to a ByteArrayOutputStream, then call its toByteArray()to obtain the byte array.
从输入流中读取并写入ByteArrayOutputStream，然后调用它toByteArray()以获取字节数组。
Create a ByteArrayInputStreamaround the byte array to read from it.
在字节数组周围创建一个ByteArrayInputStream以从中读取。
Here's a quick test:
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());
}
}
回答by anvarik
Or first convert it to a byte array, then to a bytearrayinputstream.
或者先将其转换为字节数组，然后再转换为字节数组输入流。
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);
回答by Jaroslav
You can use org.apache.commons.io.IOUtils#toByteArray(java.io.InputStream)
您可以使用 org.apache.commons.io。IOUtils#toByteArray(java.io.InputStream)
InputStream is = getMyInputStream();
ByteArrayInputStream bais = new ByteArrayInputStream(IOUtils.toByteArray(is));
