代码来自http://www.cnblogs.com/zovon/p/4345501.html
按着项目需求改动一下，做个笔记
- ImageUtil.java
package com.md.utils;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* Created by CrazyMouse on 2017/5/18.
*/
public final class ImageUtil {
/**图片格式: JPG*/
private static final String PICTRUE_FORMATE_JPG = "jpg";
public ImageUtil() {
}
/**
* 生成组合头像
* @param paths 用户头像地址
* @throws IOException
*/
public static void getCombinationOfHead(List paths, String outputImage) throws IOException {
List bufferedImages = new ArrayList<>();
// 压缩图片所有的图片生成尺寸
int imgWidth = 0;
int imgHeight = 0;
if (paths.size() == 1) {
imgWidth = 180;
imgHeight = 180;
} else if (paths.size() >= 2 && paths.size() <= 4) {
imgWidth = 90;
imgHeight = 90;
} else if (paths.size() > 4) {
imgWidth = 60;
imgHeight = 60;
}
for (int i = 0; i < paths.size(); i++) {
bufferedImages.add(ImageUtil.resize(paths.get(i), imgHeight, imgWidth, true));
}
int width = 180; // 画板的宽高
int height = 180; // 画板的高度
// BufferedImage.TYPE_INT_RGB可以自己定义可查看API
BufferedImage outImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 生成画布
Graphics g = outImage.getGraphics();
Graphics2D g2d = (Graphics2D) g;
// 设置背景色
g2d.setBackground(new Color(231,231,231));
// 通过使用当前绘图表面的背景色进行填充来清除指定的矩形。
g2d.clearRect(0, 0, width, height);
// 开始拼凑 根据图片的数量判断该生成那种样式的组合头像目前为4中
for (int i = 1; i <= bufferedImages.size(); i++) {
if (bufferedImages.size() == 9) {
if (i <= 3) {
g2d.drawImage(bufferedImages.get(i - 1), 60 * (i-1), 0, null);
} else if(i > 3 && i <= 6) {
g2d.drawImage(bufferedImages.get(i - 1), 60 * (i-4), 60, null);
} else {
g2d.drawImage(bufferedImages.get(i - 1), 60 * (i-7), 120, null);
}
} else if (bufferedImages.size() == 8) {
if (i <= 3) {
g2d.drawImage(bufferedImages.get(i - 1), 60 * (i-1), 0, null);
} else if(i > 3 && i <= 6) {
g2d.drawImage(bufferedImages.get(i - 1), 60 * (i-4), 60, null);
} else {
g2d.drawImage(bufferedImages.get(i - 1), 30 + 60 * (i-7), 120, null);
}
} else if (bufferedImages.size() == 7) {
if (i <= 3) {
g2d.drawImage(bufferedImages.get(i - 1), 60 * (i-1), 0, null);
} else if(i > 3 && i <= 6) {
g2d.drawImage(bufferedImages.get(i - 1), 60 * (i-4), 60, null);
} else {
g2d.drawImage(bufferedImages.get(i - 1), 60, 120, null);
}
} else if (bufferedImages.size() == 6) {
if (i <= 3) {
g2d.drawImage(bufferedImages.get(i - 1), 60 * (i-1), 30, null);
} else {
g2d.drawImage(bufferedImages.get(i - 1), 60 * (i-4), 90, null);
}
} else if (bufferedImages.size() == 5) {
if (i <= 3) {
g2d.drawImage(bufferedImages.get(i - 1), 60 * (i-1), 30, null);
} else {
g2d.drawImage(bufferedImages.get(i - 1), 30 + 60 * (i-4), 90, null);
}
} else if (bufferedImages.size() == 4) {
if (i <= 2) {
g2d.drawImage(bufferedImages.get(i - 1), 90 * (i-1), 0, null);
} else {
g2d.drawImage(bufferedImages.get(i - 1), 90 * (i-3), 90, null);
}
} else if (bufferedImages.size() == 3) {
if (i == 3) {
g2d.drawImage(bufferedImages.get(i - 1), 45, 90, null);
} else {
g2d.drawImage(bufferedImages.get(i - 1), 90 * (i-1), 0, null);
}
} else if (bufferedImages.size() == 2) {
g2d.drawImage(bufferedImages.get(i - 1), 90 * (i-1), 45, null);
} else if (bufferedImages.size() == 1) {
g2d.drawImage(bufferedImages.get(i - 1), 0, 0, null);
}
// 需要改变颜色的话在这里绘上颜色。可能会用到AlphaComposite类
}
String outPath = "/Users/CrazyMouse/Desktop/temp/"+outputImage+".jpg";
String format = "JPG";
ImageIO.write(outImage, format, new File(outPath));
}
/**
* 图片缩放
* @param filePath
* @param height
* @param width
* @param bb 比例不对时是否需要补白
* @return
*/
public static BufferedImage resize(String filePath, int height, int width, boolean bb) {
try {
double ratio = 0; // 缩放比例
File f = new File(filePath);
BufferedImage bi = ImageIO.read(f);
Image itemp = bi.getScaledInstance(width, height, Image.SCALE_SMOOTH);
// 计算比例
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;
}
}
- test
package com.md;
import com.md.utils.ImageUtil;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.ArrayList;
import java.util.List;
/**
* Created by CrazyMouse on 2017/5/18.
*/
@RunWith(SpringRunner.class)
@SpringBootTest
public class ImageUtilTest {
@Test
public void testOneImage() throws Exception {
List paths = new ArrayList<>();
for (int i = 1; i <= 1; i++) {
paths.add("/Users/CrazyMouse/Desktop/temp/img"+i+".jpg");
}
ImageUtil.getCombinationOfHead(paths, "image1");
}
@Test
public void testTwoImage() throws Exception {
List paths = new ArrayList<>();
for (int i = 1; i <= 2; i++) {
paths.add("/Users/CrazyMouse/Desktop/temp/img"+i+".jpg");
}
ImageUtil.getCombinationOfHead(paths, "image2");
}
@Test
public void testThreeImage() throws Exception {
List paths = new ArrayList<>();
for (int i = 1; i <= 3; i++) {
paths.add("/Users/CrazyMouse/Desktop/temp/img"+i+".jpg");
}
ImageUtil.getCombinationOfHead(paths, "image3");
}
@Test
public void testFourImage() throws Exception {
List paths = new ArrayList<>();
for (int i = 1; i <= 4; i++) {
paths.add("/Users/CrazyMouse/Desktop/temp/img"+i+".jpg");
}
ImageUtil.getCombinationOfHead(paths, "image4");
}
@Test
public void testFiveImage() throws Exception {
List paths = new ArrayList<>();
for (int i = 1; i <= 5; i++) {
paths.add("/Users/CrazyMouse/Desktop/temp/img"+i+".jpg");
}
ImageUtil.getCombinationOfHead(paths, "image5");
}
@Test
public void testSixImage() throws Exception {
List paths = new ArrayList<>();
for (int i = 1; i <= 6; i++) {
paths.add("/Users/CrazyMouse/Desktop/temp/img"+i+".jpg");
}
ImageUtil.getCombinationOfHead(paths, "image6");
}
@Test
public void testSevenImage() throws Exception {
List paths = new ArrayList<>();
for (int i = 1; i <= 7; i++) {
paths.add("/Users/CrazyMouse/Desktop/temp/img"+i+".jpg");
}
ImageUtil.getCombinationOfHead(paths, "image7");
}
@Test
public void testEightImage() throws Exception {
List paths = new ArrayList<>();
for (int i = 1; i <= 8; i++) {
paths.add("/Users/CrazyMouse/Desktop/temp/img"+i+".jpg");
}
ImageUtil.getCombinationOfHead(paths, "image8");
}
@Test
public void testNineImage() throws Exception {
List paths = new ArrayList<>();
for (int i = 1; i <= 9; i++) {
paths.add("/Users/CrazyMouse/Desktop/temp/img"+i+".jpg");
}
ImageUtil.getCombinationOfHead(paths, "image9");
}
}
image.png