html转图片 html2Image

html2Image/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.3.2.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>xyz.zhouzhaodong</groupId>
+    <artifactId>html2image</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>html2image</name>
+    <description>Demo project for Spring Boot</description>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.github.xuwei-k</groupId>
+            <artifactId>html2image</artifactId>
+            <version>0.1.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.junit.vintage</groupId>
+                    <artifactId>junit-vintage-engine</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

html2Image/src/main/java/xyz/zhouzhaodong/html2image/Html2imageApplication.java

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+package xyz.zhouzhaodong.html2image;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Html2imageApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Html2imageApplication.class, args);
+    }
+
+}

html2Image/src/main/java/xyz/zhouzhaodong/html2image/controller/TestController.java

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+package xyz.zhouzhaodong.html2image.controller;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import xyz.zhouzhaodong.html2image.util.Html2Image;
+
+/**
+ * 控制层
+ *
+ * @author zhouzhaodong
+ */
+@RestController
+public class TestController {
+
+    @RequestMapping("/test")
+    public String message(){
+        return Html2Image.html2Img("./m.jpg");
+    }
+
+}

html2Image/src/main/java/xyz/zhouzhaodong/html2image/util/Html2Image.java

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+package xyz.zhouzhaodong.html2image.util;
+
+import gui.ava.html.image.generator.HtmlImageGenerator;
+
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.awt.image.MemoryImageSource;
+import java.awt.image.PixelGrabber;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * html转图片
+ *
+ * @author zhouzhaodong
+ */
+public class Html2Image {
+
+
+    /**
+     * HTML转Image
+     *
+     * @param fileAddress 生成图片的地址
+     * @return 希望生成的Image Location
+     */
+    public static String html2Img(String fileAddress) {
+        HtmlImageGenerator imageGenerator = new HtmlImageGenerator();
+        try {
+            String htmlText = getHtmlContent();
+            imageGenerator.loadHtml(htmlText);
+            Thread.sleep(500);
+            imageGenerator.getBufferedImage();
+            Thread.sleep(1500);
+            imageGenerator.saveAsImage(fileAddress);
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw new RuntimeException("将HTML文件转换成图片异常");
+        }
+        return fileAddress;
+    }
+
+    /**
+     * HTML转InputStream
+     *
+     * @param htmText HTML文本字符串
+     * @return 希望生成的Image Location
+     */
+    public static InputStream html2InputStream(String htmText) {
+        HtmlImageGenerator imageGenerator = new HtmlImageGenerator();
+        InputStream inputStream;
+        try {
+            imageGenerator.loadHtml(htmText);
+            Thread.sleep(100);
+            BufferedImage bufferedImage = imageGenerator.getBufferedImage();
+            Thread.sleep(200);
+            inputStream = bufferedImageToInputStream(bufferedImage);
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+        return inputStream;
+    }
+
+    /**
+     * 将BufferedImage转换为InputStream
+     *
+     * @param bufferedImage
+     * @return
+     */
+    public static InputStream bufferedImageToInputStream(BufferedImage bufferedImage) {
+        ByteArrayOutputStream os = new ByteArrayOutputStream();
+        try {
+            ImageIO.write(bufferedImage, "png", os);
+            return new ByteArrayInputStream(os.toByteArray());
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    /**
+     *
+     * @Description 转换成24位图的BMP
+     * @param image
+     * @return
+     */
+    public static BufferedImage transformGray24BitMap(BufferedImage image){
+
+        int h = image.getHeight();
+        int w = image.getWidth();
+        // 定义数组，用来存储图片的像素
+        int[] pixels = new int[w * h]; 
+        int gray;
+        PixelGrabber pg = new PixelGrabber(image, 0, 0, w, h, pixels, 0, w);
+        try {
+            pg.grabPixels(); // 读取像素值
+        } catch (InterruptedException e) {
+            throw new RuntimeException("转换成24位图的BMP时，处理像素值异常");
+        }
+
+        // 扫描列 
+        for (int j = 0; j < h; j++){  
+            // 扫描行
+            for (int i = 0; i < w; i++) { 
+                // 由红，绿，蓝值得到灰度值
+                gray = (int) (((pixels[w * j + i] >> 16) & 0xff) * 0.8);
+                gray += (int) (((pixels[w * j + i] >> 8) & 0xff) * 0.1);
+                gray += (int) (((pixels[w * j + i]) & 0xff) * 0.1);
+                pixels[w * j + i] = (255 << 24) | (gray << 16) | (gray << 8) | gray;
+            }
+        }
+
+        MemoryImageSource s= new MemoryImageSource(w,h,pixels,0,w);
+        Image img = Toolkit.getDefaultToolkit().createImage(s);
+        //如果要转换成别的位图，改这个常量即可
+        BufferedImage buf = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
+        buf.createGraphics().drawImage(img, 0, 0, null);
+        return buf;
+    }
+
+    /**
+     * 生成html字符串
+     *
+     * @return
+     */
+    public static String getHtmlContent() {
+        // 需要先进行查询相关数据，然后进行拼接
+        String htmlText = "<html>\n";
+        htmlText += "<head>\n";
+        htmlText += "</head>\n";
+        htmlText += "<body>\n";
+        htmlText += "<div class=\"logImg\" style=\"margin:0;left:0;top:2px;text-align: center;width: 350px;\">\n";
+        // 注：图片src不支持相对路径，必须加上file:/// 或者直接写http的url。
+        htmlText += "    <img align=\"middle\" src=\"https://pics3.baidu.com/feed/fd039245d688d43f57e5e274f47fe21c0ff43b54.jpeg?token=e6e076b7fa492c108a5b08805e35f8f0\">\n";
+        htmlText += "</div>\n";
+        htmlText += "<div class=\"contentText\" style=\"margin:20px 0 0 0\">\n";
+        htmlText += "    <table border=\"0\" style=\"width: 350px;\">\n";
+        htmlText += "        <tbody>\n";
+        htmlText += "        <tr>\n";
+        htmlText += "            <td align=\"middle\" style=\"font-size:20px\">导出测试</td>\n";
+        htmlText += "        </tr>\n";
+        htmlText += "        </tbody>\n";
+        htmlText += "    </table>\n";
+        htmlText += "</div>\n";
+        htmlText += "</body>\n";
+        htmlText += "</html> \n";
+
+        return htmlText;
+    }
+
+}

html2Image/src/main/resources/application.yml

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+server:
+  port: 8888

html2Image/src/test/java/xyz/zhouzhaodong/html2image/Html2imageApplicationTests.java

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+package xyz.zhouzhaodong.html2image;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class Html2imageApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}