先写个工具类
Graphics2DUtils
public final class Graphics2DUtils {
/**
* 向画布上写文字
*
* @param g Graphics2D对象
* @param color 颜色
* @param font 字体
* @param content 内容
* @param x 坐标x
* @param y 坐标y
*/
public static void drawString(Graphics2D g, Color color, Font font, String content, float x, float y) {
g.setColor(color);
g.setFont(font);
g.drawString(content, x, y);
}
/**
* 向画布上写多行文字文字，自动居中
*
* @param g Graphics2D对象
* @param color 颜色
* @param font 字体
* @param content 内容
* @param x 坐标X
* @param y 坐标y
* @param width 画布宽度
* @param lineWordNum 每行字数
* @param linePadding 行间距
* @param center 是否居中
*/
public static void drawString(Graphics2D g, Color color, Font font, String content, float x, float y, int width, int lineWordNum, int linePadding, boolean center) {
int num = content.length();
List<String> contents = new ArrayList<>();
if (num <= lineWordNum) {
contents.add(content);
} else {
for (int i = 0; i < num; i += lineWordNum) {
contents.add(StringUtils.substring(content, i, i + lineWordNum));
}
}
for (int i = 0; i < contents.size(); i++) {
String s = contents.get(i);
if (i != 0) {
y += linePadding + font.getSize();
}
if (center) {
drawCenterString(g, color, font, s, width, y);
} else {
drawString(g, color, font, s, x, y);
}
}
}
/**
* 向画布上写多行文字文字，自动居中
*
* @param g Graphics2D对象
* @param color 颜色
* @param font 字体
* @param content 内容
* @param y 坐标y
* @param width 画布宽度
* @param lineWordNum 每行字数
* @param linePadding 行间距
*/
public static void drawCenterString(Graphics2D g, Color color, Font font, String content, float y, int width, int lineWordNum, int linePadding) {
drawString(g, color, font, content, 0, y, width, lineWordNum, linePadding, true);
}
/**
* 向画布上写文字，自动居中
*
* @param g Graphics2D对象
* @param color 颜色
* @param font 字体
* @param content 内容
* @param width 画布宽度
* @param y 坐标y
*/
public static void drawCenterString(Graphics2D g, Color color, Font font, String content, int width, float y) {
int textWidth = getStringWidth(g, font, content);
drawString(g, color, font, content, (width - textWidth) / 2, y);
}
/**
* 获取字符串内容的宽度
*
* @param g Graphics2D对象
* @param font 字体
* @param content 内容
* @return
*/
public static int getStringWidth(Graphics2D g, Font font, String content) {
FontMetrics fm = g.getFontMetrics(font);
//获取字符串宽度
return fm.stringWidth(content);
}开始生成
PosterUtils
public class PosterUtils {
private static final String ACCESS_TOKEN = "微信小程序token";
public static String createPoster(String posterTitle, Long scene, String moneyReward, String petNameUrl) throws Exception {
String resourcePath = PosterUtils.class.getResource("/image/").getPath();
long nowTime = System.currentTimeMillis();
String qrcodeName = UUID.randomUUID().toString().replace("-", "");
String petUrlName = UUID.randomUUID().toString().replace("-", "");
URL petUnitUrl = new URL(petNameUrl);
HttpURLConnection conn = (HttpURLConnection) petUnitUrl.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5 * 1000);
BufferedInputStream biss = new BufferedInputStream(conn.getInputStream());
OutputStream outputStream = new FileOutputStream(new File(resourcePath + petUrlName + ".png"));
int lens;
byte[] arrs = new byte[1024];
while ((lens = biss.read(arrs)) != -1) {
outputStream.write(arrs, 0, lens);
outputStream.flush();
}
outputStream.close();
//二维码图片
URL getCodeUrl = new URL("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" + ACCESS_TOKEN);
HttpURLConnection httpURLConnection = (HttpURLConnection) getCodeUrl.openConnection();
httpURLConnection.setRequestMethod("POST");// 提交模式
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
JSONObject paramJson = new JSONObject();
paramJson.accumulate("scene", scene).accumulate("page", "pages/index/index");
paramJson.put("auto_color", false);
JSONObject lineColor = new JSONObject();
lineColor.put("r", 0);
lineColor.put("g", 0);
lineColor.put("b", 0);
paramJson.put("line_color", lineColor);
printWriter.write(paramJson.toString());
printWriter.flush();
BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());
OutputStream ost = new FileOutputStream(new File(resourcePath + qrcodeName + ".png"));
int len;
byte[] arr = new byte[1024];
while ((len = bis.read(arr)) != -1) {
ost.write(arr, 0, len);
ost.flush();
}
ost.close();
//合成图片
String title = posterTitle;
if (title.length() > 21) {
title = StringUtils.substring(title, 0, 21) + "...";
}
//宠物图片文件
File petImg = FileUtils.toFile(PosterUtils.class.getResource("/image/" + petUrlName + ".png"));
//二维码图片文件 1
File qrCodeImg = FileUtils.toFile(PosterUtils.class.getResource("/image/" + qrcodeName + ".png"));
//背景地址
//为了方便演示放在resources中，可根据实际情况（上传后）将背景模板放入单独的资源文件夹或远程资源服务器
URL url = PosterUtils.class.getResource("/image/c5073a05c0d02953c0a357e6f3372b5.png");
File fileBg = FileUtils.toFile(url);
//1、背景图片输入流
FileInputStream fis = new FileInputStream(fileBg);
//2、背景图片对象
Image srcImg = ImageIO.read(fis);
//3、创建画布，根据背景图片的宽高
BufferedImage bufferedImage = new BufferedImage(
//宽度
srcImg.getWidth(null),
//高度
srcImg.getHeight(null),
//图片类型
BufferedImage.TYPE_INT_RGB);
int width = bufferedImage.getWidth();
int height = bufferedImage.getHeight();
//4、得到2d画笔对象
Graphics2D g = bufferedImage.createGraphics();
// 设置对线段的锯齿状边缘处理
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
//5、设置画布背景
g.drawImage(srcImg.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);
//6、```````````开始作画```````````
Font rewardFirstFont = new Font("PingFang SC Bold", Font.PLAIN, 24);
Font rewardLastFont = new Font("PingFang SC Bold", Font.PLAIN, 48);
int rewardFirstWidth = Graphics2DUtils.getStringWidth(g, rewardFirstFont, "赏金￥");
int rewardLastWidth = Graphics2DUtils.getStringWidth(g, rewardLastFont, moneyReward);
//赏金内容
Graphics2DUtils.drawString(g, Color.decode("#ffd434"), rewardFirstFont, "赏金￥", (width - rewardFirstWidth - rewardLastWidth) / 2, 550);
Graphics2DUtils.drawString(g, Color.decode("#ffd434"), rewardLastFont, moneyReward, (width - rewardLastWidth + rewardFirstWidth) / 2, 550);
//标题
Graphics2DUtils.drawString(g, Color.decode("#323232"), new Font("PingFang SC Bold", Font.BOLD, 34), title, 0, 400, width, 12, 5, true);
//把宠物图片和二维码图片划入背景
g.drawImage(ImageIO.read(petImg), 130, 90, 362, 250, null);
g.drawImage(ImageIO.read(qrCodeImg), 100, 700, 175, 175, null);
// ```````````结束作画```````````
//7、处理画作
g.dispose();
//8、得到输出流
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, "jpg", os);
//9、转成base64编码前端可以直接显示，也可转换成其它形式比如文件
String encodeStr = Base64.getEncoder().encodeToString(os.toByteArray());
//保存为图片文件
FileUtils.writeByteArrayToFile(new File("d:/" + nowTime + ".jpg"), os.toByteArray());
//10、关闭输入输出流
fis.close();
os.close();
qrCodeImg.delete();
petImg.delete();
return encodeStr;
}
}
base64的图片已经返回
看实际保存的效果
