Java实现画图的详细步骤（完整代码）

Java实现画图的详细步骤（完整代码）

一、导入依赖

net.coobird

thumbnailator

0.4.13

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 images, List 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 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 images, List 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 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 = newhttp:// 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 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 formData, HttpServletResponse response) {

String templateId = formData.get("templateId");

String ids = formData.get("meetingApplyId");

List meetingApplyIds = Arrays.asList(ids.split(","));

List 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 images http://= new ArrayList<>();

List texts = new ArrayList<>();

// 查询模板详情

List 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,

http:// 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 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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