Java DiscordWebhook class to easily execute Discord Webhooks

DiscordWebhook.java

import javax.net.ssl.HttpsURLConnection;
import java.awt.Color;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Array;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Class used to execute Discord Webhooks with low effort
 */
public class DiscordWebhook {

    private final String url;
    private String content;
    private String username;
    private String avatarUrl;
    private boolean tts;
    private List<EmbedObject> embeds = new ArrayList<>();

    /**
     * Constructs a new DiscordWebhook instance
     *
     * @param url The webhook URL obtained in Discord
     */
    public DiscordWebhook(String url) {
        this.url = url;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public void setAvatarUrl(String avatarUrl) {
        this.avatarUrl = avatarUrl;
    }

    public void setTts(boolean tts) {
        this.tts = tts;
    }

    public void addEmbed(EmbedObject embed) {
        this.embeds.add(embed);
    }

    public void execute() throws IOException {
        if (this.content == null && this.embeds.isEmpty()) {
            throw new IllegalArgumentException("Set content or add at least one EmbedObject");
        }

        JSONObject json = new JSONObject();

        json.put("content", this.content);
        json.put("username", this.username);
        json.put("avatar_url", this.avatarUrl);
        json.put("tts", this.tts);

        if (!this.embeds.isEmpty()) {
            List<JSONObject> embedObjects = new ArrayList<>();

            for (EmbedObject embed : this.embeds) {
                JSONObject jsonEmbed = new JSONObject();

                jsonEmbed.put("title", embed.getTitle());
                jsonEmbed.put("description", embed.getDescription());
                jsonEmbed.put("url", embed.getUrl());

                if (embed.getColor() != null) {
                    Color color = embed.getColor();
                    int rgb = color.getRed();
                    rgb = (rgb << 8) + color.getGreen();
                    rgb = (rgb << 8) + color.getBlue();

                    jsonEmbed.put("color", rgb);
                }

                EmbedObject.Footer footer = embed.getFooter();
                EmbedObject.Image image = embed.getImage();
                EmbedObject.Thumbnail thumbnail = embed.getThumbnail();
                EmbedObject.Author author = embed.getAuthor();
                List<EmbedObject.Field> fields = embed.getFields();

                if (footer != null) {
                    JSONObject jsonFooter = new JSONObject();

                    jsonFooter.put("text", footer.getText());
                    jsonFooter.put("icon_url", footer.getIconUrl());
                    jsonEmbed.put("footer", jsonFooter);
                }

                if (image != null) {
                    JSONObject jsonImage = new JSONObject();

                    jsonImage.put("url", image.getUrl());
                    jsonEmbed.put("image", jsonImage);
                }

                if (thumbnail != null) {
                    JSONObject jsonThumbnail = new JSONObject();

                    jsonThumbnail.put("url", thumbnail.getUrl());
                    jsonEmbed.put("thumbnail", jsonThumbnail);
                }

                if (author != null) {
                    JSONObject jsonAuthor = new JSONObject();

                    jsonAuthor.put("name", author.getName());
                    jsonAuthor.put("url", author.getUrl());
                    jsonAuthor.put("icon_url", author.getIconUrl());
                    jsonEmbed.put("author", jsonAuthor);
                }

                List<JSONObject> jsonFields = new ArrayList<>();
                for (EmbedObject.Field field : fields) {
                    JSONObject jsonField = new JSONObject();

                    jsonField.put("name", field.getName());
                    jsonField.put("value", field.getValue());
                    jsonField.put("inline", field.isInline());

                    jsonFields.add(jsonField);
                }

                jsonEmbed.put("fields", jsonFields.toArray());
                embedObjects.add(jsonEmbed);
            }

            json.put("embeds", embedObjects.toArray());
        }

        URL url = new URL(this.url);
        HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
        connection.addRequestProperty("Content-Type", "application/json");
        connection.addRequestProperty("User-Agent", "Java-DiscordWebhook-BY-Gelox_");
        connection.setDoOutput(true);
        connection.setRequestMethod("POST");

        OutputStream stream = connection.getOutputStream();
        stream.write(json.toString().getBytes());
        stream.flush();
        stream.close();

        connection.getInputStream().close(); //I'm not sure why but it doesn't work without getting the InputStream
        connection.disconnect();
    }

    public static class EmbedObject {
        private String title;
        private String description;
        private String url;
        private Color color;

        private Footer footer;
        private Thumbnail thumbnail;
        private Image image;
        private Author author;
        private List<Field> fields = new ArrayList<>();

        public String getTitle() {
            return title;
        }

        public String getDescription() {
            return description;
        }

        public String getUrl() {
            return url;
        }

        public Color getColor() {
            return color;
        }

        public Footer getFooter() {
            return footer;
        }

        public Thumbnail getThumbnail() {
            return thumbnail;
        }

        public Image getImage() {
            return image;
        }

        public Author getAuthor() {
            return author;
        }

        public List<Field> getFields() {
            return fields;
        }

        public EmbedObject setTitle(String title) {
            this.title = title;
            return this;
        }

        public EmbedObject setDescription(String description) {
            this.description = description;
            return this;
        }

        public EmbedObject setUrl(String url) {
            this.url = url;
            return this;
        }

        public EmbedObject setColor(Color color) {
            this.color = color;
            return this;
        }

        public EmbedObject setFooter(String text, String icon) {
            this.footer = new Footer(text, icon);
            return this;
        }

        public EmbedObject setThumbnail(String url) {
            this.thumbnail = new Thumbnail(url);
            return this;
        }

        public EmbedObject setImage(String url) {
            this.image = new Image(url);
            return this;
        }

        public EmbedObject setAuthor(String name, String url, String icon) {
            this.author = new Author(name, url, icon);
            return this;
        }

        public EmbedObject addField(String name, String value, boolean inline) {
            this.fields.add(new Field(name, value, inline));
            return this;
        }

        private class Footer {
            private String text;
            private String iconUrl;

            private Footer(String text, String iconUrl) {
                this.text = text;
                this.iconUrl = iconUrl;
            }

            private String getText() {
                return text;
            }

            private String getIconUrl() {
                return iconUrl;
            }
        }

        private class Thumbnail {
            private String url;

            private Thumbnail(String url) {
                this.url = url;
            }

            private String getUrl() {
                return url;
            }
        }

        private class Image {
            private String url;

            private Image(String url) {
                this.url = url;
            }

            private String getUrl() {
                return url;
            }
        }

        private class Author {
            private String name;
            private String url;
            private String iconUrl;

            private Author(String name, String url, String iconUrl) {
                this.name = name;
                this.url = url;
                this.iconUrl = iconUrl;
            }

            private String getName() {
                return name;
            }

            private String getUrl() {
                return url;
            }

            private String getIconUrl() {
                return iconUrl;
            }
        }

        private class Field {
            private String name;
            private String value;
            private boolean inline;

            private Field(String name, String value, boolean inline) {
                this.name = name;
                this.value = value;
                this.inline = inline;
            }

            private String getName() {
                return name;
            }

            private String getValue() {
                return value;
            }

            private boolean isInline() {
                return inline;
            }
        }
    }

    private class JSONObject {

        private final HashMap<String, Object> map = new HashMap<>();

        void put(String key, Object value) {
            if (value != null) {
                map.put(key, value);
            }
        }

        @Override
        public String toString() {
            StringBuilder builder = new StringBuilder();
            Set<Map.Entry<String, Object>> entrySet = map.entrySet();
            builder.append("{");

            int i = 0;
            for (Map.Entry<String, Object> entry : entrySet) {
                Object val = entry.getValue();
                builder.append(quote(entry.getKey())).append(":");

                if (val instanceof String) {
                    builder.append(quote(String.valueOf(val)));
                } else if (val instanceof Integer) {
                    builder.append(Integer.valueOf(String.valueOf(val)));
                } else if (val instanceof Boolean) {
                    builder.append(val);
                } else if (val instanceof JSONObject) {
                    builder.append(val.toString());
                } else if (val.getClass().isArray()) {
                    builder.append("[");
                    int len = Array.getLength(val);
                    for (int j = 0; j < len; j++) {
                        builder.append(Array.get(val, j).toString()).append(j != len - 1 ? "," : "");
                    }
                    builder.append("]");
                }

                builder.append(++i == entrySet.size() ? "}" : ",");
            }

            return builder.toString();
        }

        private String quote(String string) {
            return "\"" + string + "\"";
        }
    }

}

in toString()
return builder.toString(); → return builder.toString().replace("\n","\n");

If using libraries is an option, you can replace JSONObject with org.codehaus.jettison:jettison's implementation of JSONObject.
That seems to work more reliably than the one provided.

Is anyone still using this ? I still got Server returned HTTP response code: 400 for URL:
Already edit code base on comment

stream.write(json.toString().getBytes(StandardCharsets.UTF_8));

Is anyone still using this ? I still got Server returned HTTP response code: 400 for URL: Already edit code base on comment

stream.write(json.toString().getBytes(StandardCharsets.UTF_8));

Yes, I am using it and it works great.
You can try to use \\n instead of \n.
Or remove JSONObject class from DiscordWebhook class and use org.codehaus.jettison.json.JSONObject instead.
You can use either one (but not both).

I don't know where to find \n but when I replace JSONObject to org.codehaus.jettison.json.JSONObject I still got Server returned HTTP response code: 400 for URL:

I don't know where to find \n but when I replace JSONObject to org.codehaus.jettison.json.JSONObject I still got Server returned HTTP response code: 400 for URL:

Please post a minimum reproducible example then I may be able to help.

I don't know where to find \n but when I replace JSONObject to org.codehaus.jettison.json.JSONObject I still got Server returned HTTP response code: 400 for URL:

Please post a minimum reproducible example then I may be able to help.

Here is the source code using Discord Webhook the java class is in utils folder

I don't know where to find \n but when I replace JSONObject to org.codehaus.jettison.json.JSONObject I still got Server returned HTTP response code: 400 for URL:

Please post a minimum reproducible example then I may be able to help.

Here is the source code using Discord Webhook the java class is in utils folder

It seems your issue is trying to get plugin.getConfig().getString("discord-webhook.thumbnail") instead of plugin.getConfig().getString("discord-webhook.thumbnail.icon").
That will result in invalid value for the thumbnail url.

It is always a good idea to put a breakpoint at DiscordWebhook line 150, so you can check the json it is sending and compare it with the docs.

Oh I get wrong string on that 😅 thank for tell me about it

Any way to use BufferedImage instead of an URL in setImage?

Can you send me a working sample embed code?

in toString() return builder.toString(); → return builder.toString().replace("\n","\n");

You are the biggest W ever, this worked for me after trial and error for a while. I don't know how i didn't see the comment xD

For everybody who wants a Gradle / Maven dependency:

I created a repository from this gist: https://github.com/micartey/webhookly
I also improved the code style and readability