MyRenderDemo
 
public class MyRenderDemo {
    static  Engine engine ;
    static  {
         engine = Engine.createEngine();
         engine.registerRenderer(User.class,new MyRender());
    }
    public  static <T>  String  render(String template, Map<String,Object> context) {
        return engine.transform(template,context);
    }
}
MyRender

public class MyRender implements Renderer<User> {
    @Override
    public String render(User o, Locale locale, Map model) {
        return  String.format("%d----------%s------%s",o.getAge(),o.getName(),o.getExtend());
    }
}
main 入口

String template = "======= ";
String template2 = "{\n" +
        "\"nane\":\"\",\n" +
        "\"age\":,\n" +
        " \"extend\":\"\"\n" +
        "}";
String template3 ="\n" +
        "    <em></em>\n" +
        "    <em></em>\n" +
        "";
Map<String,Object> extendMsg = new HashMap<>();
extendMsg.put("type","local message");
Map<String,Object> context = new HashMap<>();
User user = new User();
user.setExtend(extendMsg);
user.setAge(333);
user.setConf(Arrays.asList(new Conf("ddd","333"),new Conf("rrrr","5555")));
user.setName("33333");
context.put("user",user);
String result = MyRenderDemo.render(template,context);
System.out.println(result);
String result2 = MyRenderDemo.render(template2,context);
System.out.println(result2);
String result3 = MyRenderDemo.render(template3,context);
System.out.println(result3);