Get Started with Java Utils Library

This guide will help you get started with Contentstack Java Utils SDK to build apps powered by Contentstack.

Prerequisites

To get started with the Java Utils SDK, you will need:

• JDK 8 or later
• Contentstack account
• Latest version of any of below IDEs:
  • IntelliJ IDEA
  • Eclipse
  • Spring Tool Suite
  • VSCode

SDK Installation and Setup

To setup Utils SDK in your Java project, add the following dependency in the pom.xml file:

<dependency>
  <groupId>com.contentstack.sdk</groupId>
  <artifactId>util</artifactId>
  <version>latest</version>
</dependency>

Note: If you are using the Java Contentstack SDK, you don’t need to run the java-utils dependencies as 'com.contentstack.sdk:utils:1.0.0' is already imported in the SDK.

<dependency>
  <groupId>com.contentstack.sdk</groupId>
  <artifactId>java</artifactId>
  <version>latest</version>
</dependency>

Get the latest sdk dependency from here.

Usage

Let’s learn how you can use Java Utils SDK to render embedded items.

Create Render Option

To render embedded items on the front-end, use the renderContents function, and define the UI elements you want to show in the front-end of your website, as shown in the example code below:

package com.contentstack.utils;
​
import com.contentstack.utils.helper.Metadata;
import com.contentstack.utils.interfaces.NodeCallback;
import com.contentstack.utils.interfaces.Option;
import com.contentstack.utils.node.MarkType;
import org.json.JSONObject;
​
public class DefaultOptionClass implements Option {
​
    @Override
    public String renderOptions(JSONObject embeddedObject, Metadata metadata) {
        switch (metadata.getStyleType()) {
            case BLOCK:
                return "<p>" + embeddedObject.getString("title") + "</p><span>" +
                        embeddedObject.getString("multi") + "</span>";
            case INLINE:
                return "<p>" + embeddedObject.getString("title") + "</p><span>" +
                        embeddedObject.getString("line") + "</span>";
            case LINK:
                return "<p>" + embeddedObject.getString("title") + "</p><span>" +
                        embeddedObject.getString("key") + "</span>";
            case DISPLAY:
                return "<p>" + embeddedObject.getString("someTitle") + "</p><span>" +
                        embeddedObject.getString("multi") + "</span>";
            default:
                return null;
        }
    }
​
    @Override
    public String renderMark(MarkType markType, String renderText) {
        if (markType == MarkType.BOLD) {
            return "<b>" + renderText + "</b>";
        }
        return null;
    }
​
    @Override
    public String renderNode(String nodeType, JSONObject nodeObject, NodeCallback callback) {
        if (nodeType.equalsIgnoreCase("paragraph")) {
            String children = callback.renderChildren(nodeObject.optJSONArray("children"));
            return "<p class='class-id'>" + children + "</p>";
        }
​
        return null;
    }
}

Basic Queries

Contentstack Utils SDK lets you interact with the Content Delivery APIs and retrieve embedded items from the RTE field of an entry.

Fetch Embedded Item(s) from a Single Entry

To get an embedded item of a single entry, you need to provide the stack API key, environment name, delivery token, content type UID and entry UID. Then, use the includeEmbeddedItems function as shown below:

import Contentstack
Stack stack = Contentstack.stack("apiKey", "deliveryToken", "environment_name");
ContentType contentType = stack.contentType("content_type_uid");
Entry entry = contentType.entry("entry_uid");
entry.includeEmbeddedItems();
entry.fetch(new EntryResultCallBack() {
    @Override
    public void onCompletion(ResponseType responseType, Error error) {
        if (error == null) {
            // [Success block]
            String[] keyPath = {
            "rich_text_editor", "global_rich_multiple.group.rich_text_editor"
            };
            JSONObject jsonObject = entry.toJSON();
            Utils.render(jsonObject, keyPath, new Option());
        } else {
            [Error block]
        }}
});

Fetch Embedded Item(s) from Multiple Entries

To get embedded items from multiple entries, you need to provide the stack API key, environment name, delivery token, and content type’s UID.

import Contentstack
Stack stack = Contentstack.stack("apiKey", "deliveryToken", "environment_name");
Query query = stack.contentType("content_type_uid").query();
query.includeEmbeddedItems(); // include embedded items
query.find(new QueryResultsCallBack() {
    @Override
    public void onCompletion(ResponseType responseType, QueryResult queryResult, Error error) {
        if (error == null) {
            List<Entry> entries = queryresult.getResultObjects();
            String[] keyPath = {
            "rich_text_editor", "global_rich_multiple.group.rich_text_editor"
            };
            for (Entry entry : entries) {
                JSONObject jsonObject = entry.toJSON();
                Utils.render(jsonObject, keyPath, new Option());
            }
        }}
});

Render JSON RTE Contents

To get multiple entries, you need to provide the stack API key, environment name, delivery token, content type and entry UID. Then, use the Contentstack.Utils.jsonToHTML function as shown below:

import Contentstack
Stack stack = Contentstack.stack("apiKey", "deliveryToken", "environment_name");
Query query = stack.contentType("content_type_uid").query();
query.includeEmbeddedItems(); // include embedded items
query.find(new QueryResultsCallBack() {
    @Override
    public void onCompletion(ResponseType responseType, QueryResult queryResult, Error error) {
        if (error == null) {
            List<Entry> entries = queryresult.getResultObjects();
            String[] keyPath = {
            "rte_fieldUid", "group.rteFieldUID"
            };
            for (Entry entry : entries) {
                JSONObject jsonObject = entry.toJSON();
                Utils.jsonToHTML(jsonObject, keyPath, new Option());
            }
        }}
});