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java工具类-java仿微信九宫格头像

發布時間：2024/1/8 编程问答 25 豆豆

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創建Utils類
ImageUtil

package com.mrd.utils;import javax.imageio.ImageIO; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.net.MalformedURLException; import java.net.ProtocolException; import java.net.URL; import java.security.KeyManagementException; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.util.ArrayList; import java.util.List;public class ImageUtil {/*** 圖片的間隙*/private static final int SIDE = 6;/*** 畫板尺寸*/private static final int CANVANS_W = 112;private static final int CANVANS_H = 112;/*** 尺寸1 （小）*/private static final int ONE_IMAGE_SIZE = CANVANS_H - (2 * SIDE);/*** 尺寸2 （中）*/private static final int TWO_IMAGE_SIZE = (CANVANS_H - (3 * SIDE)) / 2;/*** 尺寸3 （大）*/private static final int FIVE_IMAGE_SIZE = (CANVANS_H - (4 * SIDE)) / 3;/*** 生成群組頭像** @param paths 圖片鏈接* @param dir 輸出路徑* @param groupId 群編號* @return* @throws IOException*/public static boolean getCombinationOfhead(List<String> paths, String dir, String groupId)throws IOException {List<BufferedImage> bufferedImages = new ArrayList<BufferedImage>();int imageSize = 0;if (paths.size() <= 1) {//若為一張圖片imageSize = ONE_IMAGE_SIZE;} else if (paths.size() > 1 && paths.size() < 5) {//若為2-4張圖片imageSize = TWO_IMAGE_SIZE;} else {//若>=5張圖片imageSize = FIVE_IMAGE_SIZE;}for (int i = 0; i < paths.size(); i++) {BufferedImage resize2 = ImageUtil.resize2(paths.get(i), imageSize, imageSize, true);bufferedImages.add(resize2);}BufferedImage outImage = new BufferedImage(CANVANS_W, CANVANS_H, BufferedImage.TYPE_INT_RGB);// 生成畫布Graphics g = outImage.getGraphics();Graphics2D g2d = (Graphics2D) g;// 設置背景色g2d.setBackground(new Color(231, 231, 231));// 通過使用當前繪圖表面的背景色進行填充來清除指定的矩形。g2d.clearRect(0, 0, CANVANS_W, CANVANS_H);// 開始拼湊根據圖片的數量判斷該生成那種樣式的組合頭像目前為九種for (int i = 1; i <= bufferedImages.size(); i++) {Integer size = bufferedImages.size();switch (size) {case 1:g2d.drawImage(bufferedImages.get(i - 1), SIDE, SIDE, null);break;case 2:if (i == 1) {g2d.drawImage(bufferedImages.get(i - 1), SIDE, (CANVANS_W - imageSize) / 2, null);} else {g2d.drawImage(bufferedImages.get(i - 1), 2 * SIDE + imageSize, (CANVANS_W - imageSize) / 2, null);}break;case 3:if (i == 1) {g2d.drawImage(bufferedImages.get(i - 1), (CANVANS_W - imageSize) / 2, SIDE, null);} else {g2d.drawImage(bufferedImages.get(i - 1), (i - 1) * SIDE + (i - 2) * imageSize, imageSize + (2 * SIDE), null);}break;case 4:if (i <= 2) {g2d.drawImage(bufferedImages.get(i - 1), i * SIDE + (i - 1) * imageSize, SIDE, null);} else {g2d.drawImage(bufferedImages.get(i - 1), (i - 2) * SIDE + (i - 3) * imageSize, imageSize + 2 * SIDE, null);}break;case 5:if (i <= 2) {g2d.drawImage(bufferedImages.get(i - 1), (CANVANS_W - 2 * imageSize - SIDE) / 2 + (i - 1) * imageSize + (i - 1) * SIDE, (CANVANS_W - 2 * imageSize - SIDE) / 2, null);} else {g2d.drawImage(bufferedImages.get(i - 1), (i - 2) * SIDE + (i - 3) * imageSize, ((CANVANS_W - 2 * imageSize - SIDE) / 2) + imageSize + SIDE, null);} //break;case 6:if (i <= 3) {g2d.drawImage(bufferedImages.get(i - 1), SIDE * i + imageSize * (i - 1), (CANVANS_W - 2 * imageSize - SIDE) / 2, null);} else {g2d.drawImage(bufferedImages.get(i - 1), ((i - 3) * SIDE) + ((i - 4) * imageSize), ((CANVANS_W - 2 * imageSize - SIDE) / 2) + imageSize + SIDE, null);}break;case 7:if (i <= 1) {g2d.drawImage(bufferedImages.get(i - 1), 2 * SIDE + imageSize, SIDE, null);}if (i <= 4 && i > 1) {g2d.drawImage(bufferedImages.get(i - 1), ((i - 1) * SIDE) + ((i - 2) * imageSize), 2 * SIDE + imageSize, null);}if (i <= 7 && i > 4) {g2d.drawImage(bufferedImages.get(i - 1), ((i - 4) * SIDE) + ((i - 5) * imageSize), 3 * SIDE + 2 * imageSize, null);}break;case 8:if (i <= 2) {g2d.drawImage(bufferedImages.get(i - 1), (CANVANS_W - 2 * imageSize - SIDE) / 2 + (i - 1) * imageSize + (i - 1) * SIDE, SIDE, null);}if (i <= 5 && i > 2) {g2d.drawImage(bufferedImages.get(i - 1), ((i - 2) * SIDE) + ((i - 3) * imageSize), 2 * SIDE + imageSize, null);}if (i <= 8 && i > 5) {g2d.drawImage(bufferedImages.get(i - 1), ((i - 5) * SIDE) + ((i - 6) * imageSize), 3 * SIDE + 2 * imageSize, null);}break;case 9:if (i <= 3) {g2d.drawImage(bufferedImages.get(i - 1), (i * SIDE) + ((i - 1) * imageSize), SIDE, null);}if (i <= 6 && i > 3) {g2d.drawImage(bufferedImages.get(i - 1), ((i - 3) * SIDE) + ((i - 4) * imageSize), 2 * SIDE + imageSize, null);}if (i <= 9 && i > 6) {g2d.drawImage(bufferedImages.get(i - 1), ((i - 6) * SIDE) + ((i - 7) * imageSize), 3 * SIDE + 2 * imageSize, null);}break;default:break;}}StringBuffer outPath = new StringBuffer().append(dir).append(File.separatorChar).append("GP-" + groupId).append(".jpg");String format = "JPG";File file = new File(outPath.toString());if (!file.exists()) {file.mkdirs();}return ImageIO.write(outImage, format, file);}/*** 圖片縮放** @param filePath 圖片路徑* @param height 高度* @param width 寬度* @param bb 比例不對時是否需要補白*/public static BufferedImage resize2(String filePath, int height, int width,boolean bb) {try {double ratio = 0; // 縮放比例 // System.out.println("圖片縮放"+filePath);BufferedImage bi = null;if (filePath.indexOf("http://") == 0) {bi = ImageIO.read(new URL(filePath));} else {bi = ImageIO.read(new File(filePath));}Image itemp = bi.getScaledInstance(width, height,Image.SCALE_SMOOTH);// 計算比例if ((bi.getHeight() > height) || (bi.getWidth() > width)) {if (bi.getHeight() > bi.getWidth()) {ratio = (new Integer(height)).doubleValue()/ bi.getHeight();} else {ratio = (new Integer(width)).doubleValue() / bi.getWidth();}AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);itemp = op.filter(bi, null);}if (bb) {BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);Graphics2D g = image.createGraphics();g.setColor(Color.white);g.fillRect(0, 0, width, height);if (width == itemp.getWidth(null)) {g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2,itemp.getWidth(null), itemp.getHeight(null),Color.white, null);} else {g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0,itemp.getWidth(null), itemp.getHeight(null),Color.white, null);}g.dispose();itemp = image;}return (BufferedImage) itemp;} catch (IOException e) {e.printStackTrace();}return null;}/*** 刪除文件** @param path* @param filename*/public void delFile(String path, String filename) {File file = new File(path + "/" + filename);if (file.exists() && file.isFile()) {file.delete();}} }

創建測試類
ImgTest

import com.mrd.utils.ImageUtil; import org.junit.Test; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List;public class ImgTest {@Testpublic void imgDemo() throws IOException {Integer groupId = 0;for (int i = 1; i < 10; i++) {List<String> list = new ArrayList<>();for (int j = 0; j < i; j++) {//本地圖片路徑或者網絡圖片路徑list.add("C:\\Users\\趙念\\Pictures\\Saved Pictures\\demo\\QQ截圖20190508145846.png");}File file = new File("");//生成目錄String path = file.getCanonicalPath() + "/src/main/webapp/temp/";groupId++;ImageUtil.getCombinationOfhead(list, path, groupId.toString());}} }

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