Bean to CVS

TestReflection.java

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class TestReflection {

	public static void main(String args[]) {
		List<Usuario> usuarios = new ArrayList<Usuario>();
		for ( int i=0 ; i<10 ; i++) {
			Usuario usuario = new Usuario();
			usuario.setNome("Teste");
			usuario.setEmail("teste@gmail.com");
			usuario.setCpf("111.111.111-11");
			usuarios.add(usuario);
		}
		
		List<String> header = Arrays.asList("Nome","Email","CPF");
		String csv = writeCsvContent(usuarios, header);
		System.out.println(csv);
	}

    public static String writeCsvContent(List<?> data, List<String> header) {
        StringBuilder csv = new StringBuilder();
        String delimiter = ",";
        String breakLine = "\n";

        for (int i=0 ; i<header.size(); i++){ 
            csv.append(header.get(i));
            if (i < header.size()-1) csv.append(delimiter);
        }
        if (header.size() > 0) csv.append(breakLine);

        for (Object obj : data) {
            Object currentInstance = obj;
            List<Method> getterMethods = filterGetterMethods(obj.getClass().getDeclaredMethods());
            for (int i = 0; i < getterMethods.size(); i++) {
                if (isGetter(getterMethods.get(i))) {
                    Object returned = null;
                    try {
                        returned = getterMethods.get(i).invoke(currentInstance);
                    } catch (Throwable e) {
                        e.printStackTrace();
                    }
                    String value = (returned == null) ? "\"\"" : "\"" + returned.toString() + "\"";
                    csv.append(value);
                    if (i < getterMethods.size()-1) csv.append(delimiter);
                }
            }
            csv.append(breakLine);
        }
        return String.valueOf(csv);
    }

    public static List<Method> filterGetterMethods(Method [] methods) {
        List<Method> list = new ArrayList<Method>();
        for (int i = 0; i < methods.length; i++) {
            if (isGetter(methods[i])) list.add(methods[i]);
        }
        return list;
    }
	
	public static void printDeclaredGettersSetters(Class aClass){
	  Method[] methods = aClass.getDeclaredMethods();

	  for(Method method : methods){
		if(isGetter(method)) System.out.println("getter: " + method);
		if(isSetter(method)) System.out.println("setter: " + method);
	  }
	}
	
	public static void printGettersSetters(Class aClass){
	  Method[] methods = aClass.getMethods();

	  for(Method method : methods){
		if(isGetter(method)) System.out.println("getter: " + method);
		if(isSetter(method)) System.out.println("setter: " + method);
	  }
	}

	public static boolean isGetter(Method method){
	  if(!method.getName().startsWith("get")) return false;
	  if(method.getParameterTypes().length != 0) return false;  
	  if(void.class.equals(method.getReturnType())) return false;
	  return true;
	}

	public static boolean isSetter(Method method){
	  if(!method.getName().startsWith("set")) return false;
	  if(method.getParameterTypes().length != 1) return false;
	  return true;
	}
}