写了两天，总算做出来了。

主要是调格式，完全是苦力活。

刚开始一行行实现，后来需要做成视频效果，又进行了部分修改。

public static void main(String[] args) throws Exception {
//		 ImageUtil.cut(FileUtil.Desktop+"1.jpg", FileUtil.Desktop+"tail.jpg",
//		 148, 328,110,110);
		
		
		//生成头
//		String chatTo="自由|帮你找课|招代理";
//		String curtime="晚上11:36";
//		int percent=75;
//		BufferedImage bi = makeHead(chatTo, curtime, percent);
		
		
		BufferedImage me = ImageUtil.getRoundedImage(ImageIO.read(new File(FileUtil.Desktop+"我.png")),10);//110
		BufferedImage he = ImageUtil.getRoundedImage(ImageIO.read(new File(FileUtil.Desktop+"她.png")),10);
		String background=FileUtil.Desktop+"bg.jpg";//1851
		String[] rows={"me`什么价格","he`腾讯文档医学会员","he`单买88 会员199","以上是打招呼的内容","15:22","me`我好像有这个了，2020年买的，标题都没变"};
//		BufferedImage bi = makeChat(me, he, background, rows);
//		ImageIO.write(bi, "png", new File(FileUtil.Desktop + "target.png"));
		
		BufferedImage read = ImageIO.read(new File(FileUtil.Desktop+"bg.png"));
		Graphics2D g = (Graphics2D) read.getGraphics();
		g=cal(g,rows,me,he);
		ImageIO.write(read, "png", new File(FileUtil.Desktop + "target.png"));
	}public static BufferedImage makeChat(BufferedImage me, BufferedImage he, String background, String[] rows)
			throws IOException {
		//开始距离25 距离30 日期间隔45 日期50 
		//最长对话740
		BufferedImage bi = ImageIO.read(new File(background));
		Graphics2D g2 = (Graphics2D) bi.getGraphics();
		// 消除文字锯齿
		g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
		// 消除画图锯齿
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		int cury=25;
		for (int i = 0; i < rows.length; i++) {
			String row=rows[i];
			if(row.startsWith("me`")){
				cury=isay(g2,me,row.substring(row.indexOf("`")+1),cury);
			}else if(row.startsWith("he`")){
				cury=hesay(g2,he,row.substring(row.indexOf("`")+1),cury);
			}else if(row.matches("(周.\\s)?\\d+:\\d+")){
				if(i>0)cury+=15;
				cury=drawDate(g2, row, cury);
			}else if("以上是打招呼的内容".equals(row)){
				cury=drawDesc(g2, row, cury);
			}
		}
		return bi;
	}
public static int drawDesc(Graphics2D g2,String desc,int cury) throws IOException{
		Font font=new Font("黑体", Font.PLAIN, 38);
		g2.setFont(font);
		int len = ImageUtil.getDrawStringLength(g2, desc);
		int beginx=(1080-(len+2*font.getSize()/3))/2;
		
		//绘文本框
		g2.setColor(Color.white);
		g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,0.5f));//设置透明度
		g2.fillRoundRect(beginx, cury, len+2*font.getSize()/3, 70, 10,10);
		g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));// 透明度设置结束
		
		//绘日期
		g2.setColor(Color.black);
		ImageUtil.drawString(g2, desc, 0, font, 540-len/2, (int)(cury+((70-font.getSize())/2)+font.getSize()*0.9));
		return cury+70+30;
	}
	public static int drawDate(Graphics2D g2,String time,int cury) throws IOException{
		Font font=new Font("黑体", Font.PLAIN, 30);
		g2.setFont(font);
		int len = ImageUtil.getDrawStringLength(g2, time);
		int beginx=(1080-(len+2*font.getSize()/2))/2;
		
		//绘文本框
		g2.setColor(Color.white);
		g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,0.5f));//设置透明度
		g2.fillRoundRect(beginx, cury, len+2*font.getSize()/2, 50, 10,10);
		g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));// 透明度设置结束
		
		//绘日期
		g2.setColor(Color.black);
		ImageUtil.drawString(g2, time, 0, font, 540-len/2, (int)(cury+((50-font.getSize())/2)+font.getSize()*0.9));
		return cury+50+45;
	}


现在是先把所有的位置全部计算出来


List<Integer> beginys=new ArrayList<Integer>();//本回复最开始
		List<Integer> endys=new ArrayList<Integer>();//本回复的结束
		List<Integer> kuang_beginxs=new ArrayList<Integer>();//框开始
		List<Integer> kuang_heights=new ArrayList<Integer>();//框高度
		List<Integer> zi_beginxs=new ArrayList<Integer>();//文字开始
		List<Integer> zi_widths=new ArrayList<Integer>();//字最大宽度
		List<Integer> zi_fontsizes=new ArrayList<Integer>();//本回复的文字大小
		List<List<String>> contents=new ArrayList<List<String>>();//本回复内容

 

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