itwanger/poster

// 金山词霸的图片路径
String formatDate = DateFormatUtils.format(new Date(), "yyyyMMdd");
String picURL = "http://cdn.iciba.com/news/word/big_" + formatDate + "b.jpg";

// 根据路径发起 HTTP get 请求
HttpGet httpget = new HttpGet(picURL);
// 使用 addHeader 方法添加请求头部
httpget.addHeader("Content-Type", "text/html;charset=UTF-8");

// 配置请求的超时设置
RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(500).setConnectTimeout(500)
		.setSocketTimeout(500).build();
httpget.setConfig(requestConfig);

CloseableHttpClient httpclient = HttpClientBuilder.create().build();
CloseableHttpResponse response = httpclient.execute(httpget);

HttpEntity entity = response.getEntity();
InputStream picStream = entity.getContent();

File pic = Files.createTempFile(Paths.get("D:\\test"), "pic_", ".jpg");
FileOutputStream fos = new FileOutputStream(pic);
int read = 0;

// 1024Byte(字节)=1KB 1024KB=1MB
byte[] bytes = new byte[1024 * 100];
while ((read = inputStream.read(bytes)) != -1) {
	fos.write(bytes, 0, read);
}

fos.flush();
fos.close();

ClassLoader classLoader = ReadBgAndQrcode.class.getClassLoader();

File bgFile = Files.createTempFile(DIRECTORY, "bg_", ".jpg").toFile();
InputStream inputStream = classLoader.getResourceAsStream("default_bgimg.jpg");
FileUtils.copyInputStreamToFile(inputStream, bgFile);
logger.debug("背景：" + bgFile.getAbsolutePath());


File qrcodeFile = Files.createTempFile(DIRECTORY, "qrcode_", ".jpg").toFile();
InputStream qrcodeInputStream = classLoader.getResourceAsStream("default_qrcodeimg.jpg");
FileUtils.copyInputStreamToFile(qrcodeInputStream, qrcodeFile);
logger.debug("二维码：" + qrcodeFile.getAbsolutePath());

// 背景
File bgFile = FileUtil.read("bg_", ".jpg", "default_bgimg.jpg");
bgFile.deleteOnExit();
BufferedImage bgImage = ImageIO.read(bgFile);

// 封面图
File picFile = CapturePic.capture();
picFile.deleteOnExit();
BufferedImage picImage = ImageIO.read(picFile);

// 封面图的起始坐标
int pic_x = MARGIN, pic_y = MARGIN;
// 封面图的宽度
int pic_width = bgImage.getWidth() - MARGIN * 2;
// 封面图的高度
int pic_height = picImage.getHeight() * pic_width / picImage.getWidth();

Graphics2D graphics2d = bgImage.createGraphics();
// 在背景上绘制封面图
graphics2d.drawImage(picImage, pic_x, pic_y, pic_width, pic_height, null);
// 释放图形上下文，以及它正在使用的任何系统资源。
graphics2d.dispose();

File posterFile = Files.createTempFile(FileUtil.DIRECTORY, "poster_", ".jpg").toFile();
ImageIO.write(bgImage, "jpg", posterFile);

String[] fontNames = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();

for (String fontName : fontNames) {
	System.out.println(fontName);
}

// Font 的构造参数依次是字体名字，字体式样，字体大小
Font font = new Font("微软雅黑", Font.PLAIN, 28);
g.setFont(font);
// RGB
g.setColor(new Color(71, 71, 71));

public static String makeLineFeed(String zh, FontDesignMetrics metrics, int max_width) {
	StringBuilder sb = new StringBuilder();
	int line_width = 0;
	for (int i = 0; i < zh.length(); i++) {
		char c = zh.charAt(i);
		sb.append(c);

		// 如果主动换行则跳过
		if (sb.toString().endsWith("\n")) {
			line_width = 0;
			continue;
		}

		// FontDesignMetrics 的 charWidth() 方法可以计算字符的宽度
		int char_width = metrics.charWidth(c);
		line_width += char_width;

		// 如果当前字符的宽度加上之前字符串的已有宽度超出了海报的最大宽度，则换行
		if (line_width >= max_width - char_width) {
			line_width = 0;
			sb.append("\n");
		}
	}
	return sb.toString();
}

Font font = new Font("微软雅黑", Font.PLAIN, 28);
FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);

String zh = "沉默王二，《Web 全栈开发进阶之路》作者；一个不止写代码的程序员，还写有趣有益的文字，给不喜欢严肃的你。";

String[] rows = makeLineFeed(zh, metrics, 600).split("\n");
for (int i = 0; i < rows.length; i++) {
	System.out.println(rows[i]);
}

// 自动换行后的文本
String zhWrap = FontUtil.makeLineFeed(graphics2dPoster.getZh(), metrics, graphics2dPoster.getSuitableWidth());

// 拆分行
String[] zhWraps = zhWrap.split("\n");

// 将每一行在海报背景上打印
for (int i = 0; i < zhWraps.length; i++) {
	graphics2dPoster.addCurrentY(metrics.getHeight());
	graphics2d.drawString(zhWraps[i], MARGIN, graphics2dPoster.getCurrentY());
}

graphics2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

public static String makeEnLineFeed(String en, FontDesignMetrics metrics, int max_width) {
	// 每个单词后追加空格
	char space = ' ';
	int spaceWidth = metrics.charWidth(space);

	// 按照空格对英文文本进行拆分
	String[] words = en.split(String.valueOf(space));
	// 利用 StringBuilder 对字符串进行修改
	StringBuilder sb = new StringBuilder();
	// 每行文本的宽度
	int len = 0;

	for (int i = 0; i < words.length; i++) {
		String word = words[i];

		int wordWidth = metrics.stringWidth(word);
		// 叠加当前单词的宽度
		len += wordWidth;

		// 超出最大宽度，进行换行
		if (len > max_width) {
			sb.append("\n");
			sb.append(word);
			sb.append(space);

			// 下一行的起始宽度
			len = wordWidth + spaceWidth;
		} else {
			sb.append(word);
			sb.append(space);

			// 多了一个空格
			len += spaceWidth;
		}
	}
	return sb.toString();
}

Font font = new Font("微软雅黑", Font.PLAIN, 28);
FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);

String en = "Fear can hold you prisoner. Hope can set you free. It takes a strong man to save himself, and a great man to save another.";
String[] rows = makeEnLineFeed(en, metrics, 600).split("\n");
for (int i = 0; i < rows.length; i++) {
	System.out.println(rows[i]);
}

// 设置封面图和下方中文之间的距离
graphics2dPoster.addCurrentY(20);

Graphics2D graphics2d = graphics2dPoster.getGraphics2d();
graphics2d.setColor(new Color(157, 157, 157));

FontDesignMetrics metrics = FontDesignMetrics.getMetrics(graphics2d.getFont());
String enWrap = FontUtil.makeEnLineFeed(graphics2dPoster.getEn(), metrics, graphics2dPoster.getSuitableWidth());
String[] enWraps = enWrap.split("\n");
for (int i = 0; i < enWraps.length; i++) {
	graphics2dPoster.addCurrentY(metrics.getHeight());
	graphics2d.drawString(enWraps[i], MARGIN, graphics2dPoster.getCurrentY());
}

// 二维码
File qrcodeFile = FileUtil.read("qrcode_", ".jpg", "default_qrcodeimg.jpg");
qrcodeFile.deleteOnExit();

BufferedImage qrcodeImage = ImageIO.read(qrcodeFile);
// 二维码起始坐标
int qrcode_x = bgImage.getWidth() - qrcodeImage.getWidth() - MARGIN;
int qrcode_y = bgImage.getHeight() - qrcodeImage.getHeight() - MARGIN;
graphics2dPoster.getGraphics2d().drawImage(qrcodeImage, qrcode_x, qrcode_y, qrcodeImage.getWidth(),
		qrcodeImage.getHeight(), null);

graphics2d.setColor(new Color(71, 71, 71));
Font font = new Font(USE_FONT_NAME, Font.PLAIN, 22);
graphics2d.setFont(font);
FontDesignMetrics metrics = FontDesignMetrics.getMetrics(graphics2d.getFont());

graphics2d.drawString("沉默王二", MARGIN, bgImage.getHeight() - MARGIN - metrics.getHeight() * 2);
graphics2d.drawString("一个幽默的程序员", MARGIN, bgImage.getHeight() - MARGIN - metrics.getDescent());