JAVA判断图片的类型

代码：

import java.io.File;
import java.io.IOException;
import java.util.Iterator;import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;public class DetermineFormatOfAnImage {public static void main(String[] args) throws IOException {// get image format in a fileFile file = new File("newimage.jpg");// create an image input stream from the specified fileImageInputStream iis = ImageIO.createImageInputStream(file);// get all currently registered readers that recognize the image formatIterator iter = ImageIO.getImageReaders(iis);if (!iter.hasNext()) {throw new RuntimeException("No readers found!");}// get the first readerImageReader reader = iter.next();System.out.println("Format: " + reader.getFormatName());// close streamiis.close();}}

输出

Format: JPEG

来源：http://outofmemory.cn/code-snippet/1092/java-usage-ImageReader-decide-tupian-type

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