Thumbnails 图片处理

Thumbnails 是由谷歌提供的图片处理包，目前版本0.4.8。

可以简洁的实现图片的缩放、压缩、旋转、水印、格式转换等操作。

示例代码：

package test;

import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.geometry.Coordinate;
import net.coobird.thumbnailator.geometry.Positions;
import org.junit.Test;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;

public class TestImageUtils {

    @Test
    public void testThumbnails() throws IOException {
        String baseUrl = "imgurl";
        String QRCodeUrl = "watermark url";

        // 读入图片，输入可以是Url/InputStream/File/BufferedImage
        BufferedImage qrCode = Thumbnails.of(new URL(QRCodeUrl)).size(220, 220).asBufferedImage();
        Thumbnails.of(new URL(baseUrl))
                .size(1080, 1372)
                .watermark(new Coordinate(807, 1115), qrCode, 1.0f) //确定水印的起始位置和透明度
                .watermark(Positions.BOTTOM_RIGHT, qrCode, 0.5f) //另一种确认水印位置的方式
                .toFile("E:/thumbnails.jpg"); //可以输出文件或OutputStream
    }
}

Thumbnails 不能添加文字，要添加文字的话需要自己另行处理。

示例代码：

package outfox.weixinactivity.weixin.utils;

import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.geometry.Coordinate;import org.junit.Test;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.net.URL;

public class TestImage {
    @Test
    public void testImageText() throws IOException {
　　     // 载入图片、加水印
        String baseUrl = "imgurl";
        String QRCodeUrl = "watermark url";
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        BufferedImage qrCode = Thumbnails.of(new URL(QRCodeUrl)).size(220, 220).asBufferedImage();
        Thumbnails.of(new URL(baseUrl))
                .size(1080, 1372)
                .watermark(new Coordinate(807, 1115), qrCode, 1.0f)
                .toOutputStream(out);
        BufferedImage image = ImageIO.read(new ByteArrayInputStream(out.toByteArray()));

        // 填加文字
        BufferedImage bi = new BufferedImage(1080, 1372, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bi.createGraphics();
        g.drawImage(image, 0, 0, null);
        g.setFont(new Font("苹方", Font.PLAIN, 40));
        g.setColor(Color.ORANGE);
        g.drawString("hello!", 220, 100);
        g.drawString("you", 220, 150);

        g.dispose();
        ImageIO.write(bi, "jpg", new File("E:/testImage.jpg"));
    }
}