Add a Java function

java/generate_screenshot/Index.java

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+import com.google.gson.Gson;
+import java.io.IOException;
+import java.math.BigDecimal;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import org.apache.tomcat.util.codec.binary.Base64;
+import sun.misc.BASE64Encoder;
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.event.KeyEvent;
+import java.awt.image.BufferedImage;
+import java.io.*;
+import java.net.*;
+import java.nio.file.Files;
+import java.util.UUID;
+
+/**
+ * @Author:Shizhan
+ * @ProjectName:screenshot
+ * @currentTime: 2023/7/26 16:02
+ */
+
+public RuntimeResponse main(RuntimeRequest req, RuntimeResponse res) throws AWTException, URISyntaxException, IOException {
+        String payloadString = req.getPayload();
+        final Gson gson = new Gson();
+        Map<String, Object> payload = gson.fromJson(payloadString, Map.class);
+        Map<String, Object> responseData = new HashMap<>();
+        //get the url
+        String urlInput = payload.get("url").toString();
+        //test if the url is valid
+        long lo = System.currentTimeMillis();
+        boolean isValid = false;
+        URL url;
+        try {
+            url = new URL(urlInput);
+            InputStream in = url.openStream();
+            //the input is true
+            isValid = true;
+        } catch (Exception e1) {
+            //the input is false
+            url = null;
+        }
+        //if the url is not valid, return false
+        if(!isValid){
+            responseData.put("success",false);
+            responseData.put("message","Website could not be reached.");
+            return res.json(responseData);
+        }
+        //get the absolute path
+        File file = new File("src/main/resources/upload");
+        String pathname = file.getAbsolutePath();
+        //JDK 1.6 and up
+        Desktop.getDesktop().browse(new URI(urlInput));
+        Robot robot = new Robot();
+        robot.delay(5000);
+        Dimension d = new Dimension(Toolkit.getDefaultToolkit().getScreenSize());
+        int width = (int) d.getWidth();
+        int height = (int) d.getHeight();
+        //maximize the browser.
+        robot.keyPress(KeyEvent.VK_F11);
+        robot.delay(2000);
+        Image image = robot.createScreenCapture(new Rectangle(0, 0, width, height));
+        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+        Graphics q = bi.createGraphics();
+        q.drawImage(image, 0, 0, width, height, null);
+        //get the File
+        File outputfile = new File(pathname + "/"+ UUID.randomUUID() +".jpg");
+        //get the absolute path
+        String absolutePath = outputfile.getAbsolutePath();
+        ImageIO.write(bi, "jpg", outputfile);
+
+        // transfer to base 64 format.
+        byte[] fileByte = null;
+        String base64Str = "";
+        try {
+            File fileNew = new File(absolutePath);
+            fileByte = Files.readAllBytes(fileNew.toPath());
+           base64Str = "data:image/png;base64," + Base64.encodeBase64String(fileByte);
+        } catch (IOException e) {
+            //return the false message
+            e.printStackTrace();
+            responseData.put("success",false);
+            responseData.put("message","Website could not be reached.");
+            return res.json(responseData);
+        }
+        //return the corrent value.
+        responseData.put("success", true);
+        responseData.put("screenshot", base64Str);
+        return res.json(responseData);
+    }

java/generate_screenshot/README.md

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+# 💻 Get Short URL
+
+A Java Cloud Function to get price of crypto.
+
+```json
+{
+  "payload": {
+    "url": "https://google.com/"
+  }
+}
+```
+
+_Example output:_
+
+
+```json
+{
+  "success":true,
+  "screenshot":"iVBORw0KGgoAAAANSUhEUgAAAaQAAALiCAY...QoH9hbkTPQAAAABJRU5ErkJggg=="
+}
+```
+
+_Error Example output:_
+
+```json
+{
+  "success": false,
+  "message":"Website could not be reached."
+}
+```
+
+
+## 📝 Environment Variables
+
+List of environment variables used by this cloud function.
+
+## 🚀 Deployment
+
+1. Clone this repository, and enter this function folder:
+
+```
+$ git clone https://github.com/open-runtimes/examples.git && cd examples
+$ cd java/generate_screenshot
+```
+
+2. Enter this function folder and build the code:
+```
+docker run -e INTERNAL_RUNTIME_ENTRYPOINT=Index.java --rm --interactive --tty --volume $PWD:/usr/code openruntimes/java:v2-18.0 sh /usr/local/src/build.sh
+```
+As a result, a `code.tar.gz` file will be generated.
+
+3. Start the Open Runtime:
+```
+docker run -p 3000:3000 -e INTERNAL_RUNTIME_KEY=secret-key --rm --interactive --tty --volume $PWD/code.tar.gz:/tmp/code.tar.gz:ro openruntimes/java:v2-18.0 sh /usr/local/src/start.sh
+```
+
+Your function is now listening on port `3000`, and you can execute it by sending `POST` request with appropriate authorization headers. To learn more about runtime, you can visit Java runtime [README](https://github.com/open-runtimes/open-runtimes/tree/main/runtimes/java-18.0).
+
+## 📝 Notes
+ - This function is designed for use with Appwrite Cloud Functions. You can learn more about it in [Appwrite docs](https://appwrite.io/docs/functions).
+ - This example is compatible with Java 18.0. Other versions may work but are not guarenteed to work as they haven't been tested.

java/generate_screenshot/deps.gradle

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+dependencies {
+    implementation 'com.google.code.gson:gson:2.9.0'
+	 implementation 'org.apache.tomcat:tomcat-util:8.5.23'
+}