java 实现图片合成，并添加文字
作者：阿若蜜意
这篇文章主要介绍了java 实现图片合成，并添加文字的示例，帮助大家更好的利用Java处理图片，感兴趣的朋友可以了解下
最近公司一个需要，需要把商品的优惠卷分享链接，生成一个二维码然后和商品主图合成一张，并且在新合成的主图增加商品信息的描述，好了直接看合成后图片的样式
下面我就直接贴代码，首先是Contorller层
/**
* 淘宝二维码，商品主图，合成一张图
*
* @param pictUrl
* @param request
* @param response
* @throws IOException
*/
@RequestMapping("/getTaoBaoqQRCode")
public void getTaoBaoqQRCode(TaoBaoQRCode taoBaoQRCode, HttpServletRequest request,
HttpServletResponse response) throws IOException {
ServletOutputStream os = null;
InputStream buffin = null;
try {
// 二维码
String couponUlr = "https:" + taoBaoQRCode.getCouponShareUrl();// 高额卷分享链接
byte[] imgByte = QrCodeUtil.createQrCode2Bytes(250, 250, couponUlr);
buffin = new ByteArrayInputStream(imgByte);
BufferedImage couponImage = ImageIO.read(buffin);
// 商品主图
String imageUrl = "https:" + taoBaoQRCode.getPictUrl();
URL url = new URL(imageUrl);
BufferedImage picImage = ImageIO.read(url);
BufferedImage modifyImage =
imageHandleUtil.mergeImage(picImage, couponImage, taoBaoQRCode.getTitle(),
taoBaoQRCode.getReservePrice(), taoBaoQRCode.getZkFinalPrice());
response.setContentType("image/jpg");
os = response.getOutputStream();
ImageIO.write(modifyImage, "jpg", os);
os.flush();
} catch (Exception e) {
LOGGER.error("getTaoBaoqQRCode error");
e.printStackTrace();
} finally {
buffin.close();
os.close();
}
}
二维码QrCodeUtil 生成帮助类
public class QrCodeUtil {
private static final int DAFAULT_WIDTH = 360;
private static final int DAFAULT_HEIGHT = 360;
private static final Logger LOGGER = LoggerFactory.getLogger(QrCodeUtil.class);
public static String createQrCode(String text) {
return createQrCode(DAFAULT_WIDTH, DAFAULT_HEIGHT, text);
}
public static String createQrCode(int widht, int height, String text) {
HashMap<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
try {
byte[] bytes = createQrCode2Bytes(widht, height, text);
String fileName = UUID.randomUUID().toString().replaceAll("-", "") + ".png";
return UpYunClient.upload(fileName, bytes);
} catch (Exception e) {
LOGGER.error("create qrcode error", e);
}
return null;
}
public static byte[] createQrCode2Bytes(String text) {
return createQrCode2Bytes(DAFAULT_WIDTH, DAFAULT_HEIGHT, text);
}
public static byte[] createQrCode2Bytes(int widht, int height, String text) {
HashMap<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
try {
BitMatrix bitMatrix =
new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, widht, height,
hints);
ByteArrayOutputStream out = new ByteArrayOutputStream();
BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix);
ImageIO.write(image, "png", out);
return out.toByteArray();
} catch (Exception e) {
LOGGER.error("create qrcode error", e);
}
return null;
}
/**
* 生成条形码并已字节码形式返回，生成的图片格式为png
*
* @param contents
* @param width
* @param height
* @return
*/
public static byte[] createBarcode2Byte(String contents, int width, int height) {
int codeWidth = 3 + // start guard
(7 * 6) + // left bars
5 + // middle guard
(7 * 6) + // right bars
3; // end guard
codeWidth = Math.max(codeWidth, width);
try {
BitMatrix bitMatrix =
new MultiFormatWriter().encode(contents, BarcodeFormat.CODE_128, codeWidth,
height, null);
BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(image, "png", out);
return out.toByteArray();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
二维码生成我这里用的是谷歌的看下面maven pom.xml 文件
<!-- 条形码、二维码生成 -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>2.2</version>
</dependency>
合成图片方法如何
package com.qft.campuscircle.common.util;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import org.springframework.stereotype.Component;
@Component
public class ImageHandleUtil {
private Font font = null;
private Graphics2D g = null;
/**
* 导入本地图片到缓冲区
*
* @param imgName
* @return
*/
public BufferedImage loadImageLocal(String imgName) {
try {
return ImageIO.read(new File(imgName));
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 导入网络图片到缓冲区
*
* @param imgName
* @return
*/
public BufferedImage loadImageUrl(String imgName) {
try {
URL url = new URL(imgName);
return ImageIO.read(url);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 生成新图片到本地
*
* @param newImage
* @param img
*/
public void writeImageLocal(String newImage, BufferedImage img) {
if (newImage != null && img != null) {
try {
// 目录不存在则创建
String dirUrl = newImage.substring(0, newImage.lastIndexOf(File.separator));
File dir = new File(dirUrl);
if (!dir.exists()) {
dir.mkdirs();
}
File outputfile = new File(newImage);
ImageIO.write(img, "png", outputfile);
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 设定文字的字体等
*
* @param fontStyle
* @param fontSize
*/
public void setFont(String name, int style, int fontSize) {
this.font = new Font(name, style, fontSize);
}
/**
* 修改图片,返回修改后的图片缓冲区（只输出一行文本）,图片居中显示
*
* @param img
* @param content
* @param y
* @param color
* @return
*/
public BufferedImage modifyImage(BufferedImage img, Object content, int y, Color color) {
try {
g = img.createGraphics();
g.setBackground(Color.WHITE);
g.setColor(color);// 设置字体颜色
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);// 抗锯齿
if (this.font != null)
g.setFont(this.font);
int width = img.getWidth();// 图片宽度
if (content != null) {
String str = content.toString();
int strWidth = g.getFontMetrics().stringWidth(str);// 字体宽度
g.drawString(str, (width - strWidth) / 2, y);
}
g.dispose();
} catch (Exception e) {
e.printStackTrace();
}
return img;
}
public BufferedImage modifyImage(BufferedImage img, Object content, int x, int y, Color color) {
try {
g = img.createGraphics();
g.setBackground(Color.WHITE);
g.setColor(color);// 设置字体颜色
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);// 抗锯齿
if (this.font != null)
g.setFont(this.font);
if (content != null) {
String str = content.toString();
g.drawString(str, x, y);
}
g.dispose();
} catch (Exception e) {
e.printStackTrace();
}
return img;
}
/**
* 将一张图片画在另一张图片上
*
* @param addImage 被添加的图片
* @param sourceImg 源图
* @param x
* @param y
* @param width
* @param height
* @return
*/
public BufferedImage modifyImagetogeter(BufferedImage addImage, BufferedImage sourceImg, int x,
int y) {
int width = addImage.getWidth();
int height = addImage.getHeight();
try {
g = sourceImg.createGraphics();
g.drawImage(addImage, x, y, width, height, null);
g.dispose();
} catch (Exception e) {
e.printStackTrace();
}
return sourceImg;
}
/**
*
* @param img1
* @param img2
* @param title 标题
* @param reservePrice 现价
* @param zkFinalPrice 折扣价
* @return BufferedImage
* @throws IOException
*/
public BufferedImage mergeImage(BufferedImage img1, BufferedImage img2,String title,String reservePrice,String zkFinalPrice)
throws IOException {
Font font = new Font("微软雅黑", Font.BOLD, 20);
int w1 = img1.getWidth();
int h1 = img1.getHeight();
int w2 = img2.getWidth();
int h2 = img2.getHeight();
BufferedImage newImage = new BufferedImage(w1, h2 + h1 + h2/2, BufferedImage.TYPE_INT_RGB);// 新的图
Graphics2D graphics = (Graphics2D) newImage.getGraphics();
graphics.setBackground(Color.WHITE);
graphics.fillRect(0, 0, newImage.getWidth(), newImage.getHeight());
graphics.drawImage(img1, 0, 0, null);
graphics.drawImage(img2, (newImage.getWidth()) / 2 - (w2 / 2), newImage.getHeight() - h2,
null);
graphics.setFont(font);
graphics.setColor(Color.BLACK);
int width = graphics.getFontMetrics(font).stringWidth(title);
int startY = h1 + 30;
if (width > newImage.getWidth()) {
char[] array = title.toCharArray();
StringBuilder sb = new StringBuilder(array[0]);
for (char c : array) {
sb.append(c);
int newWidth = graphics.getFontMetrics(font).stringWidth(sb.toString());
if ((newWidth + 19) >= newImage.getWidth()) {// 准备换行
graphics.drawString(sb.toString(), 0, startY);
startY += 30;
sb.delete(0, sb.length());
}
}
graphics.drawString(sb.toString(), 0, startY);
} else {
graphics.drawString(title, 0, startY);
}
graphics.drawString("现价￥"+reservePrice, 0, startY + 30);
startY += 30;
graphics.drawString("卷后价￥"+zkFinalPrice, 0, startY + 30);
return newImage;
}
}
两个帮助类里面有很多方法没用到，大家只要看几个关键的方法就可以了，TaoBaoQRCode 对象里面的属性我就没列出来了，大家自己根据自己的需求而定
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