Graphics2D使用记录

最近工作上写了点好久没使用了的java绘图代码，都快忘干净了，所以记录一下，最终实现的效果是下图这个样子，红色周边是美工设计的背景图，白色区域是要动态添加内容。

上代码：

package com.yueyongyueyou.common.service.impl;

import cn.hutool.core.img.ImgUtil;
import com.yueyongyueyou.common.service.IUploadFileDubboService;
import com.yueyongyueyou.common.service.ImageService;
import com.yueyongyueyou.config.service.IConfigParamService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.awt.*;
import java.awt.font.TextAttribute;
import java.awt.image.BufferedImage;
import java.math.BigDecimal;
import java.net.URL;
import java.text.AttributedString;
import java.text.DecimalFormat;

/**
 * 图片绘制实现类
 */
@Service
public class ImageServiceImpl implements ImageService {
    /**
     * 业务参数获取实现类
     */
    @Resource
    private IConfigParamService configParamService;
    /**
     * 上传oss功能实现类
     */
    @Resource
    private IUploadFileDubboService uploadService;

    /**
     * 将商品图、价格绘制到指定得背景图上，并上传到oss服务器
     *
     * @param goodsImg     商品图
     * @param groupPrice   商品拼团价
     * @param productPrice 商品零售价
     * @return 上传后得图片访问地址
     * @throws Exception
     */
    @Override
    public String generateAppletShareImg(String goodsImg, BigDecimal groupPrice, BigDecimal productPrice) throws Exception {
        //获取配置好的背景图
        String imgPrefix = configParamService.getParamValue("yyyy.img.prefix");
        String bgImg = configParamService.getParamValue("group:booking:share:bgimg");

        //背景图
        BufferedImage bgImage = ImgUtil.read(new URL(imgPrefix + bgImg));

        //商品图
        BufferedImage goodsImage = ImgUtil.read(new URL(imgPrefix + goodsImg));
        int w = goodsImage.getWidth();
        int h = goodsImage.getHeight();
        int min = Math.min(w, h);
        //切成尺寸最大得正方形
        Image cut = ImgUtil.cut(goodsImage, new Rectangle((w - min) / 2, (h - min) / 2, min, min));

        //定义颜色和字体
        Color color_B3BCC9 = ImgUtil.getColor("#B3BCC9");
        Color color_FF1355 = ImgUtil.getColor("#FF1355");
        Color color_F43011 = ImgUtil.getColor("#F43011");
        Font font_ht_33 = new Font("SimHei", Font.PLAIN, 33);
        Font font_ht_36 = new Font("SimHei", Font.PLAIN, 36);
        Font font_serif_33 = new Font("Microsoft Sans Serif", Font.PLAIN, 33);
        Font font_serif_42 = new Font("Microsoft Sans Serif", Font.PLAIN, 42);

        //定义文字变量
        final String labelText1 = "幸运价:", labelText2 = "立即参与", labelSymbol = "¥", labelDot = ".";

        DecimalFormat decimalFormat = new DecimalFormat("0.00#");
        String groupPriceStr = decimalFormat.format(groupPrice == null ? BigDecimal.ZERO : groupPrice);
        String[] split = groupPriceStr.split("\\.");
        String integerPart = split[0];
        String decimalPart = split[1];
        String productPriceStr = decimalFormat.format(productPrice == null ? BigDecimal.ZERO : productPrice);

        //开始绘画
        Graphics2D graphics = bgImage.createGraphics();
        //抗锯齿
        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        //画白底
        graphics.setColor(Color.WHITE);
        graphics.fillRoundRect(30, 144, 570, 327, 18, 18);
        //画商品
        graphics.drawImage(cut, 54, 171, 279, 279, null);
        //写右侧文字
        graphics.setColor(color_B3BCC9);
        graphics.setFont(font_ht_33);
        graphics.drawString(labelText1, 363, 189 + 27);
        //写团购价人民币符号
        graphics.setColor(color_FF1355);
        graphics.setFont(font_serif_33);
        graphics.drawString(labelSymbol, 363, 246 + 37);
        //写团购价整数部分
        FontMetrics symbolMetrics = graphics.getFontMetrics(font_serif_33);
        int symbolTextLength = symbolMetrics.stringWidth(labelSymbol);
        symbolTextLength += 3;
        graphics.setColor(color_FF1355);
        graphics.setFont(font_serif_42);
        graphics.drawString(integerPart + labelDot, 363 + symbolTextLength, 246 + 37);
        //写团购价小数部分
        FontMetrics numericMetrics = graphics.getFontMetrics(font_serif_33);
        int numericTextLength = numericMetrics.stringWidth(integerPart + labelDot);
        int adjust = (integerPart.length() + 1) * 5; //横坐标微调优化
        graphics.setColor(color_FF1355);
        graphics.setFont(font_serif_33);
        graphics.drawString(decimalPart, 363 + symbolTextLength + numericTextLength + adjust, 246 + 37);
        //写零售价
        graphics.setColor(color_B3BCC9);
        AttributedString attrString = new AttributedString(labelSymbol + productPriceStr);
        attrString.addAttribute(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON);
        attrString.addAttribute(TextAttribute.FONT, font_serif_33);
        graphics.drawString(attrString.getIterator(), 363, 306 + 29);
        //画红色按钮
        graphics.setColor(color_F43011);
        graphics.fillRoundRect(351, 378, 225, 72, 72, 72);
        //写按钮文字
        graphics.setColor(Color.WHITE);
        graphics.setFont(font_ht_36);
        graphics.drawString(labelText2, 393, 384 + 42);

        //上传到oss服务器
        String url = uploadService.uploadManagerFile(ImgUtil.toBytes(bgImage, ImgUtil.IMAGE_TYPE_PNG), ImgUtil.IMAGE_TYPE_PNG, 1, 0);

        return url;
    }
}