package *;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class ImageTest {
public ImageTest() {}
public static void main(String[] args) {
List<String> bookFilePaths = new ArrayList<String>();
bookFilePaths.add("E:\\qq\\1.jpg");
bookFilePaths.add("E:\\qq\\2.jpg");
bookFilePaths.add("E:\\qq\\3.jpg");
bookFilePaths.add("E:\\qq\\4.jpg");
bookFilePaths.add("E:\\qq\\5.jpg");
bookFilePaths.add("E:\\qq\\6.jpg");
bookFilePaths.add("E:\\qq\\7.jpg");
bookFilePaths.add("E:\\qq\\8.jpg");
bookFilePaths.add("E:\\qq\\10.jpg");
String picName = "E:\\qq\\test1.jpg";
for (String jpg : bookFilePaths) {
try {
//裁切图片200*200
doFileDownload(jpg,
null, 200, 200);
} catch (Exception e) {
e.printStackTrace();
}
}
//多张小图片生成九宫格图片600*600
createBigJPG(bookFilePaths,
Color.gray ,picName);
}
/**
* 绘制九宫格图片
* @param smallJPG
* @param bgColor
* @param picName
*/
private static void createBigJPG(List<String> smallJPG,
Color bgColor ,String picName) {
try {
int imageCount = smallJPG.size();
//每张小图片的高度，宽度
int smallWidth = 200;
int smallHeight = 200;
//按照大图片宽高绘制一个背景图片
int setWidth = 600;
int setHeight = 600;
BufferedImage bufImage = new BufferedImage(setWidth, setHeight,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufImage.createGraphics();
g.setColor(bgColor); //背景的颜色
g.fillRect(0, 0, setWidth, setHeight);
int rowCount = getRowCount(imageCount);
int leftMargin[] = {200,100,0};//左边距
int topMargin[] = {200,100,0};//左边距
int len = 0;
int y = topMargin[rowCount-1]; //纵坐标
for (int i = 1; i <= rowCount; i++) { //遍历每行
int colCount = getColCount(imageCount, rowCount, i);
int x = leftMargin[colCount-1]; //横坐标 可能会出现左边距
for (int j = 1; j <= colCount; j++) {
String jpgname = smallJPG.get(len);
ImageIcon icon = new ImageIcon(jpgname);
Image img = icon.getImage();
g.drawImage(img, x, y, null);
x += smallWidth;
len++;
}
y += smallHeight;
}
g.dispose();
FileOutputStream out = new FileOutputStream(picName); //指定输出文件
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); //设置文件格式
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bufImage); //从图片缓冲中读取
param.setQuality(50f, true);
encoder.encode(bufImage, param); //存盘
out.flush();
out.close();
} catch (Exception e) {
System.out.println( "createBigJPG Failed!");
e.printStackTrace();
}
}
//获取总行数
public static int getRowCount(int imageCount){
if(imageCount > 6){
return 3;
}
if(imageCount > 3){
return 2;
}
return 1;
}
//获取当前行的列数
public static int getColCount(int imageCount, int rowcount, int currentRow){
if(rowcount == 2){//总行数
if(currentRow == 1){//当前行
return imageCount - 3;
}else{
return 3;
}
}
if(rowcount == 3){
if(currentRow == 1){
return imageCount - 6;
}else{
return 3;
}
}
return imageCount;
}
//裁切图片
public static void doFileDownload(String path,
String filename, int width, int hight)
throws Exception {
// path是指欲下载的文件的路径。
File file = new File(path);
Image img = ImageIO.read(file); // 构造Image对象
int srcwidth = img.getWidth(null); // 得到源图宽
int srcheight = img.getHeight(null); // 得到源图长
// 按照宽度还是高度进行压缩 width 最大宽度 hight 最大高度
if (srcwidth / srcheight > width / hight) {
int h = (int) (srcheight * width / srcwidth);
resize(img, width, h, path, file);
} else {
int w = (int) (srcwidth * hight / srcheight);
resize(img, w, hight, path, file);
}
}
/**
* 强制压缩/放大图片到固定的大小
*
* @param w
* int 新宽度
* @param h
* int 新高度
*/
public static void resize(Image img, int w, int h,
String path, File file)
throws IOException {
// SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的 优先级比速度高 生成的图片质量比较好 但速度慢
BufferedImage image = new BufferedImage(w, h,
BufferedImage.TYPE_INT_RGB);
image.getGraphics().drawImage(img, 0, 0, w, h, null); // 绘制缩小后的图
File destFile = new File(path);
FileOutputStream out = new FileOutputStream(destFile); // 输出到文件流
// 可以正常实现bmp、png、gif转jpg
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image); // JPEG编码
out.close();
}
}