Java ImageIO 图片处理后变红 解决办法记录 |
您所在的位置：网站首页 › csgofps下面的变红 › Java ImageIO 图片处理后变红 解决办法记录 |
|
原因：根据网上搜罗的一大堆文章以及自己的发现，是因为原始图片（jpeg）带有alpha通道才会变红，在mac上直接显示简介的看到。 image.png然后发现使用下面这个方式可以解决变红的问题 // 把这行换成下面的方式 BufferedImage image = ImageIO.read(originFile); // 这里是直接根据url读取图片 public static BufferedImage getBufferedImage(String imgUrl) throws MalformedURLException { URL url = new URL(imgUrl); ImageIcon icon = new ImageIcon(url); Image image = icon.getImage(); // 如果是从本地加载，就用这种方式，没亲自测试过 // Image src=Toolkit.getDefaultToolkit().getImage(filePath); // This code ensures that all the pixels in the image are loaded BufferedImage bimage = null; GraphicsEnvironment ge = GraphicsEnvironment .getLocalGraphicsEnvironment(); try { int transparency = Transparency.OPAQUE; GraphicsDevice gs = ge.getDefaultScreenDevice(); GraphicsConfiguration gc = gs.getDefaultConfiguration(); bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency); } catch (HeadlessException e) { // The system does not have a screen } if (bimage == null) { // Create a buffered image using the default color model int type = BufferedImage.TYPE_INT_RGB; bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type); } // Copy image to buffered image Graphics g = bimage.createGraphics(); // Paint the image onto the buffered image g.drawImage(image, 0, 0, null); g.dispose(); return bimage; }原文链接：https://blog.csdn.net/Wu_Shang001/article/details/108227611 一个完整的例子： package cn.com.xxx.web.controller; import io.swagger.annotations.Api; import io.swagger.annotations.ApiOperation; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.swing.*; import java.awt.*; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.MalformedURLException; import java.net.URL; @Controller @RequestMapping("/image") @Api(tags = "图片处理") public class ImageController { public static BufferedImage getBufferedImage(String imgUrl) throws MalformedURLException { URL url = new URL(imgUrl); ImageIcon icon = new ImageIcon(url); Image image = icon.getImage(); // 如果是从本地加载，就用这种方式，没亲自测试过 // Image src=Toolkit.getDefaultToolkit().getImage(filePath); // This code ensures that all the pixels in the image are loaded BufferedImage bimage = null; GraphicsEnvironment ge = GraphicsEnvironment .getLocalGraphicsEnvironment(); try { int transparency = Transparency.OPAQUE; GraphicsDevice gs = ge.getDefaultScreenDevice(); GraphicsConfiguration gc = gs.getDefaultConfiguration(); bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency); } catch (HeadlessException e) { // The system does not have a screen } if (bimage == null) { // Create a buffered image using the default color model int type = BufferedImage.TYPE_INT_RGB; bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type); } // Copy image to buffered image Graphics g = bimage.createGraphics(); // Paint the image onto the buffered image g.drawImage(image, 0, 0, null); g.dispose(); return bimage; } /** * 获取远程网络图片信息 * @param imageURL * @return */ public BufferedImage getRemoteBufferedImage(String imageURL) { URL url = null; InputStream is = null; BufferedImage bufferedImage = null; try { url = new URL(imageURL); is = url.openStream(); bufferedImage = ImageIO.read(is); } catch (MalformedURLException e) { e.printStackTrace(); System.out.println("imageURL: " + imageURL + ",无效!"); return null; } catch (IOException e) { e.printStackTrace(); System.out.println("imageURL: " + imageURL + ",读取失败!"); return null; } finally { try { if (is!=null) { is.close(); } } catch (IOException e) { e.printStackTrace(); System.out.println("imageURL: " + imageURL + ",流关闭异常!"); return null; } } return bufferedImage; } public BufferedImage mergeImage(String file1Url, String file2Url) throws MalformedURLException { BufferedImage b = getBufferedImage(file1Url); BufferedImage d = getBufferedImage(file2Url); try { int w = d.getWidth() / 4; //b.getWidth(); int h = d.getHeight() / 4; // b.getHeight(); int x = d.getWidth() / 2 - w / 2; int y = d.getHeight() / 2 - h / 2; Graphics2D g = d.createGraphics(); g.drawImage(b, x, y, w, h, null); g.dispose(); } catch (Exception e) { System.out.println(e.getMessage()); } return d; } /** * 根据url进行图片合并 */ @ResponseBody @RequestMapping(value = "mergeImage", method = RequestMethod.GET) @ApiOperation(value = "根据url进行图片合并", httpMethod = "GET") public void mergeImage(HttpServletRequest request, HttpServletResponse response) throws MalformedURLException { BufferedImage bufferedImage = mergeImage("https://static-oss.cs.kemai.com.cn/vshop/0/c02582c1bba440ae89c216a8e9701daa.png", "https://work-cs.cloud.kemai.cn/img/qr_code.884b6411.png"); response.setContentType("image/png"); try (OutputStream out = response.getOutputStream()) { //这里直接写入输出流 ImageIO.write(bufferedImage, "JPEG", response.getOutputStream()); } catch (Exception e) { System.out.println(e.getLocalizedMessage()); } } } |
今日新闻 |
推荐新闻 |
| CopyRight 2018-2019 办公设备维修网 版权所有 豫ICP备15022753号-3 |