解决Java ImageIO.write处理PNG图片太慢的问题

最新推荐文章于 2024-07-30 17:20:46 发布

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博客内容讲述了在JDK7和8中使用ImageIO.write方法输出PNG图片时遇到的性能问题，指出这可能是由于一个已知的BUG导致。作者提供了一个解决方案，通过使用ImageWriter并设置压缩参数来提高输出速度。测试结果显示，优化后的代码执行时间从5198ms降低到了2127ms。此外，还提到了其他可能的替代方案如pngencoder，但仍在测试中。

在JDK7、8版本中用 ImageIO.write进行图片输出时，如果输出PNG格式图片非常的缓慢

Poor performances of imwrite, especially for png extension.

上代码-解决前：

@Test
public void testWirte() throws Exception {
        String dir = "/Users/user/Downloads/testimg/";
        final MockMultipartFile file = new MockMultipartFile("big5.png", new FileInputStream(new File(dir + "big5.png")));
        final BufferedImage bufferedImage = ImageIO.read(file.getInputStream());
        long start = System.currentTimeMillis();
        ImageIO.write(bufferedImage,"png",new FileOutputStream(new File(dir + "/out/big5-out.png")));
        System.out.println((System.currentTimeMillis() - start) +  " ms ");
}

5198 ms

解决后：

@Test
public void testWirte1() throws Exception {
        String dir = "/Users/user/Downloads/testimg/";
        final MockMultipartFile file = new MockMultipartFile("big5.png", new FileInputStream(new File(dir + "big5.png")));
        final BufferedImage bufferedImage = ImageIO.read(file.getInputStream());
        long start = System.currentTimeMillis();
        ImageWriter writer = ImageIO.getImageWritersByFormatName("png").next();
        ImageWriteParam writeParam = writer.getDefaultWriteParam();
        writeParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        writeParam.setCompressionQuality(0.9f);
        final FileImageOutputStream stream = new FileImageOutputStream(new File(dir + "/out/big5-out.png"));
        try {
            writer.setOutput(stream);
            writer.write(null, new IIOImage(bufferedImage, null, null), writeParam);
        } finally {
            stream.close();
            writer.dispose();
        }
        System.out.println((System.currentTimeMillis() - start) + " ms ");
}