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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

到此这篇关于Java实现画图的详细步骤(完整代码)的文章就介绍到这了,更多相关Java实现画图内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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