Java实现画图的详细步骤（完整代码）
作者：Java工程师time
今天给大家带来的是关于Java的相关知识,文章围绕着Java实现画图的详细步骤展开,文中有非常详细的介绍及代码示例,需要的朋友可以参考下
一、导入依赖
<dependency> <groupId>net.coobird</groupId> <artifactId>thumbnailator</artifactId> <version>0.4.13</version> </dependency>
二、工具类
package com.geidco.dcp.util;
import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.filters.ImageFilter;
import net.coobird.thumbnailator.geometry.Coordinate;
import org.apache.commons.lang3.StringUtils;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Base64;
import java.util.List;
/**
* @author XuPengFei
*/
public class ImageUtil {
public static BufferedImage watermarkImgBase64(String base64, List<ImageWatermark> images, List<ImageFontText> texts) throws Exception {
InputStream inputStream = null;
base64 = base64.replaceFirst("data:image\\/.*;base64,", "");
Base64.Decoder decoder = Base64.getDecoder();
try {
byte[] bytes = decoder.decode(base64);
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
inputStream = bais;
} catch (Exception e) {
e.printStackTrace();
}
BufferedImage destImage = ImageIO.read(inputStream);
BufferedImage tempImage = null;
int w1 = destImage.getWidth(), h1 = destImage.getHeight(), startX, startY, endX, endY;
System.out.println("w1" + w1);
System.out.println("h1" + h1);
//水印位置
Coordinate coordinate = null;
//水印位置坐标左上、右下
List<Integer> points = null;
for (ImageWatermark imageWatermark : images) {
inputStream = getInputStream(imageWatermark.getImageUrl());
if (null == inputStream) {
continue;
}
points = imageWatermark.getPoints();
startX = new BigDecimal(points.get(0)).intValue();
startY = new BigDecimal(points.get(1)).intValue();
endX = new BigDecimal(points.get(2)).intValue();
endY = new BigDecimal(points.get(3)).intValue();
//设置水印位置
coordinate = new Coordinate(startX, startY);
tempImage = Thumbnails.of(ImageIO.read(inputStream)).size(endX - startX, endY - startY).keepAspectRatio(false).asBufferedImage();
// tempImage = Thumbnails.of(ImageIO.read(inputStream)).size(180,180).keepAspectRatio(false).asBufferedImage();
// destImage = Thumbnails.of(destImage).size(w1,h1).watermark(coordinate,tempImage,1f).asBufferedImage();
destImage = Thumbnails.of(destImage).size(w1, h1).watermark(coordinate, tempImage, 1f).asBufferedImage();
}
for (ImageFontText fontText : texts) {
startX = new BigDecimal(fontText.getStartX()).intValue();
startY = new BigDecimal(fontText.getStartY()).intValue();
destImage = mergeFontText(destImage, fontText, startX, startY);
}
destImage = Thumbnails.of(destImage).addFilter(new ThumbnailsImgFilter()).size(w1, h1).asBufferedImage();
return destImage;
}
public static BufferedImage watermarkImg(String baseImgUrl, List<ImageWatermark> images, List<ImageFontText> texts) throws Exception {
InputStream inputStream = getInputStream(baseImgUrl);
if (null == inputStream) {
throw new RuntimeException("海报图片生成失败");
}
BufferedImage destImage = ImageIO.read(inputStream);
BufferedImage tempImage = null;
int w1 = destImage.getWidth(), h1 = destImage.getHeight(), startX, startY, endX, endY;
System.out.println("w1" + w1);
System.out.println("h1" + h1);
//水印位置
Coordinate coordinate = null;
//水印位置坐标左上、右下
List<Integer> points = null;
for (ImageWatermark imageWatermark : images) {
inputStream = getInputStream(imageWatermark.getImageUrl());
if (null == inputStream) {
continue;
}
points = imageWatermark.getPoints();
startX = new BigDecimal(points.get(0)).intValue();
startY = new BigDecimal(points.get(1)).intValue();
endX = new BigDecimal(points.get(2)).intValue();
endY = new BigDecimal(points.get(3)).intValue();
//设置水印位置
coordinate = new Coordinate(startX, startY);
tempImage = Thumbnails.of(ImageIO.read(inputStream)).size(endX - startX, endY - startY).keepAspectRatio(false).asBufferedImage();
// tempImage = Thumbnails.of(ImageIO.read(inputStream)).size(180,180).keepAspectRatio(false).asBufferedImage();
// destImage = Thumbnails.of(destImage).size(w1,h1).watermark(coordinate,tempImage,1f).asBufferedImage();
destImage = Thumbnails.of(destImage).addFilter(new ThumbnailsImgFilter()).size(w1, h1).watermark(coordinate, tempImage, 1f).asBufferedImage();
}
for (ImageFontText fontText : texts) {
startX = new BigDecimal(fontText.getStartX()).intValue();
startY = new BigDecimal(fontText.getStartY()).intValue();
destImage = mergeFontText(destImage, fontText, startX, startY);
}
return destImage;
}
private static BufferedImage mergeFontText(BufferedImage bufferedImage, ImageFontText fontText,
int left, int top) throws Exception {
Graphics2D g = bufferedImage.createGraphics();
g.setColor(getColor(fontText.getTextColor()));
Font font = new Font(fontText.getTextFont(), Font.BOLD, fontText.getTextSize());
g.setFont(font);
g.setBackground(Color.white);
if (fontText.getStartX() == -1) {
//昵称居中设置
FontMetrics fmNick = g.getFontMetrics(font);
int nickWidth = fmNick.stringWidth(fontText.getText());
int nickWidthX = (bufferedImage.getWidth() - nickWidth) / 2;
//绘制文字
g.drawString(new String(fontText.getText().getBytes(), "utf-8"), nickWidthX, top);
} else {
g.drawString(new String(fontText.getText().getBytes(), "utf-8"), left, top);
}
g.dispose();
return bufferedImage;
// AttributedString ats = new AttributedString("我是\n小雨哈哈哈");
// ats.addAttribute(TextAttribute.FOREGROUND, f, 0,2 );
// AttributedCharacterIterator iter = ats.getIterator();
// g.drawString(iter,left,top);
}
private static Color getColor(String color) {
if (StringUtils.isBlank(color) || color.length() < 7) {
return null;
}
try {
int r = Integer.parseInt(color.substring(1, 3), 16);
int g = Integer.parseInt(color.substring(3, 5), 16);
int b = Integer.parseInt(color.substring(5), 16);
return new Color(r, g, b);
} catch (NumberFormatException nfe) {
return null;
}
}
public static InputStream getInputStream(String baseUrl) {
if (StringUtils.isBlank(baseUrl)) {
return null;
}
try {
InputStream inputStream = new FileInputStream(baseUrl);
return inputStream;
} catch (IOException e) {
e.printStackTrace();
}
// try {
// URL url = new URL(baseUrl);
// HttpURLConnection connection = (HttpURLConnection) url.openConnection();
// connection.setConnectTimeout(6000);
// connection.setReadTimeout(6000);
// int code = connection.getResponseCode();
// if (HttpURLConnection.HTTP_OK == code) {
// return connection.getInputStream();
// }
// } catch (Exception e) {
// e.printStackTrace();
// }
return null;
}
/**
* 将透明背景设置为白色
*/
public static class ThumbnailsImgFilter implements ImageFilter {
@Override
public BufferedImage apply(BufferedImage img) {
int w = img.getWidth();
int h = img.getHeight();
BufferedImage newImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D graphic = newImage.createGraphics();
graphic.setColor(Color.white);//背景设置为白色
graphic.fillRect(0, 0, w, h);
graphic.drawRenderedImage(img, null);
graphic.dispose();
return newImage;
}
}
}
三、工具类
package com.geidco.dcp.util;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @author XuPengFei
*/
@Data
@NoArgsConstructor
@AllArgsConstructor
public class ImageFontText {
private String text;
private Integer textSize = 50;
private String textColor = "#ff0000";
private String textFont = "宋体";
private Integer startX;
private Integer startY;
}
四、工具类
package com.geidco.dcp.util;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.List;
/**
* @author XuPengFei
*/
@Data
@NoArgsConstructor
@AllArgsConstructor
public class ImageWatermark {
/**
* 图片地址
*/
private String imageUrl;
/**
* 水印图片左上、右下标
*/
private List<Integer> points;
}
五、测试接口
package com.geidco.dcp.controller.meetingApply;
import com.geidco.dcp.pojo.meetingApply.MeetingApply;
import com.geidco.dcp.pojo.meetingApply.MeetingGuestCardTemplate;
import com.geidco.dcp.service.meetingApply.MeetingApplyService;
import com.geidco.dcp.service.meetingApply.MeetingGuestCardTemplateService;
import com.geidco.dcp.util.*;
import com.xlkh.cloud.platform.common.annotation.Log;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.ResourceUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;
@RestController
@RequestMapping("/meetingGuestCard")
public class MeetingGuestCardController {
@Value("${config.ldir}")
String ldir;
@Value("${config.wdir}")
String wdir;
@Autowired
private MeetingApplyService meetingApplyService;
@Autowired
private IdWorker idWorker;
@Autowired
private MeetingGuestCardTemplateService meetingGuestCardTemplateService;
@PostMapping("/generateGuestCard")
@Log("绘制电子嘉宾证")
public void generateGuestCard(@RequestBody Map<String, String> formData, HttpServletResponse response) {
String templateId = formData.get("templateId");
String ids = formData.get("meetingApplyId");
List<String> meetingApplyIds = Arrays.asList(ids.split(","));
List<MeetingApply> meetingApplys = meetingApplyService.getByKeys(meetingApplyIds);
String uuid = UUID.randomUUID().toString().replaceAll("-", "");
String datePath = new SimpleDateFormat("yyyy/MM/dd").format(new Date()) + "/" + uuid + "/";
String zipPath = SysMeetingUtil.getAnnexFilePath() + "generateGuestCard/" + datePath;
File file = new File(zipPath);
if (!file.exists()) {
file.mkdirs();
}
// 上传的位置
String path = System.getProperty("os.name").toLowerCase().indexOf("win") >= 0 ? wdir : ldir;
MeetingGuestCardTemplate cardTemplate = meetingGuestCardTemplateService.findById(templateId);
// 底图
String baseImgUrl = cardTemplate.getBaseMapUrl();
try {
for (int i = 0; i < meetingApplys.size(); i++) {
MeetingApply meetingApply = meetingApplys.get(i);
String name = null;
String unitName = null;
String postName = null;
String photoUrl = path;
if ("zh".equals(meetingApply.getApplyWay())) {
name = meetingApply.getName();
unitName = meetingApply.getUnitName();
postName = meetingApply.getPositionName();
photoUrl = photoUrl + meetingApply.getPhotoUrl();
} else {
name = meetingApply.getNameEn();
unitName = meetingApply.getUnitNameEn();
postName = meetingApply.getPositionNameEn();
photoUrl = photoUrl + meetingApply.getPhotoUrl();
}
List<ImageWatermark> images = new ArrayList<>();
List<ImageFontText> texts = new ArrayList<>();
// 查询模板详情
List<MeetingGuestCardTemplate> templates = meetingGuestCardTemplateService.findByTemplateId(templateId);
for (MeetingGuestCardTemplate template : templates) {
String dict = template.getElementTypeDict();
if ("1".equals(dict)) {
ImageFontText imageFontText = new ImageFontText(name, StringUtils.isNotBlank(template.getFontSize()) ? Integer.parseInt(template.getFontSize()) : 30,
StringUtils.isNotBlank(template.getFontColor()) ? template.getFontColor() : "#333333",
StringUtils.isNotBlank(template.getFontType()) ? template.getFontType() : "宋体",
template.getStartX(), template.getStartY());
texts.add(imageFontText);
}
if ("2".equals(dict)) {
ImageFontText imageFontText = new ImageFontText(unitName, StringUtils.isNotBlank(template.getFontSize()) ? Integer.parseInt(template.getFontSize()) : 30,
StringUtils.isNotBlank(template.getFontColor()) ? template.getFontColor() : "#333333",
StringUtils.isNotBlank(template.getFontType()) ? template.getFontType() : "宋体",
template.getStartX(), template.getStartY());
texts.add(imageFontText);
}
if ("3".equals(dict)) {
ImageFontText imageFontText = new ImageFontText(postName, StringUtils.isNotBlank(template.getFontSize()) ? Integer.parseInt(template.getFontSize()) : 30,
StringUtils.isNotBlank(template.getFontColor()) ? template.getFontColor() : "#333333",
StringUtils.isNotBlank(template.getFontType()) ? template.getFontType() : "宋体",
template.getStartX(), template.getStartY());
texts.add(imageFontText);
}
if ("100".equals(dict)) {
Integer startX = template.getStartX();
Integer startY = template.getStartY();
Integer endX = template.getEndX();
Integer endY = template.getEndY();
List<Integer> imagePoints = Arrays.asList(startX, startY, endX, endY);
ImageWatermark image = new ImageWatermark(photoUrl, imagePoints);
images.add(image);
}
}
try {
BufferedImage bufferedImage = ImageUtil.watermarkImgBase64(baseImgUrl, images, texts);
OutputStream os = new FileOutputStream(zipPath + String.valueOf(i + 1) + name + ".jpg");
ImageIO.write(bufferedImage, "jpg", os);
//更新meetingApply的状态
MeetingApply apply = new MeetingApply();
apply.setId(meetingApply.getId());
apply.setCreateCardDate(new Date());
apply.setIsCreateCard("Yes");
apply.setCardUrl("generateGuestCard/" + datePath + String.valueOf(i + 1) + name + ".jpg");
meetingApplyService.update(apply);
} catch (Exception e) {
e.printStackTrace();
}
}
String zipFile = CompressUtil.zipFile(new File(zipPath), "zip");
response.setContentType("APPLICATION/OCTET-STREAM");
String fileName = "guestCard" + uuid + ".zip";
response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
//ZipOutputStream out = new ZipOutputStream(response.getOutputStream());
OutputStream out = response.getOutputStream();
File ftp = ResourceUtils.getFile(zipFile);
InputStream in = new FileInputStream(ftp);
// 循环取出流中的数据
byte[] b = new byte[100];
int len;
while ((len = in.read(b)) != -1) {
out.write(b, 0, len);
}
in.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
六、页面效果
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