Custom rendering of information with `InfoItemRenderer`

To demonstrate the InfoItemRenderer, implement a class that can render information provided through a custom class called MyOrder.

1. Create a module named my-order.

2. In my-order, create a package named com.liferay.docs.info.myorder

3. In the package, create a class that implements InfoItemRenderer and register it as a component.

   @Component(service = InfoItemRenderer.class)
   public class MyOrderRenderer implements InfoItemRenderer<MyOrder> {
       @Override
       public void render(
          MyOrder myOrder, HttpServletRequest httpServletRequest,
          HttpServletResponse httpServletResponse) {
   
       }
   }
   

4. Next you must add the logic for the render() method.

   @Override
   public void render(
      MyOrder myOrder, HttpServletRequest httpServletRequest,
      HttpServletResponse httpServletResponse) {
   
      StringBundler sb = new StringBundler(3);
   
      sb.append("<ul>");
      sb.append("<li>By: " + myOrder.getBy());
      sb.append("<li>When: " + myOrder.getWhen());
      sb.append("<li>Items: " + myOrder.getItems());
      sb.append("</ul>");
   
      try {
         PrintWriter printWriter = httpServletResponse.getWriter();
   
         printWriter.write(sb.toString());
      }
      catch (IOException ioe) {
         throw new RuntimeException(ioe);
      }
   }
   

For this example you rendered everything through a StringBundler. In more complex cases, you would use JSPs or another templating technology.

The renderer is ready for use! In Liferay DXP 7.2, Info Item Renderers are not widely used, but the usages and application will grow in future releases.