public class ClassBean {
    private String name;
    private String comment;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
        this.comment = comment;
    }
}

private VelocityEngine init() {
    VelocityEngine ve = new VelocityEngine();
    ve.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
    ve.setProperty("classpath.resource.loader.class", ClasspathResourceLoader.class.getName());
    ve.init();
    return ve;
}

 @Test
public void velocity_test_2() {
    VelocityEngine ve = init();

    Template t = ve.getTemplate("template/ClassVelocity.vm");
    VelocityContext ctx = new VelocityContext();

    // 数据
    List<ClassBean> classBeans = new ArrayList<>();
    ClassBean classBean1 = new ClassBean();
    classBean1.setName("username");
    classBean1.setComment("用户名");

    ClassBean classBean2 = new ClassBean();
    classBean2.setName("password");
    classBean2.setComment("密码");

    ClassBean classBean3 = new ClassBean();
    classBean3.setName("address");
    classBean3.setComment("地址");

    classBeans.add(classBean1);
    classBeans.add(classBean2);
    classBeans.add(classBean3);

    ctx.put("className", "Person");
    ctx.put("list", classBeans);

    StringWriter sw = new StringWriter();
    t.merge(ctx, sw);
    System.out.println(sw.toString());
}

##首字母大写
#macro(initUpperCase $field)
$field.toUpperCase().substring(0,1)$field.substring(1)##
#end

public class $className {
#foreach($bean in $list)
    private String $bean.getName(); // $bean.getComment()
#end
#foreach($bean in $list)
    #set($filed = $bean.getName())
    public String get#initUpperCase($filed)() {
        return $filed;
    }
    public void set#initUpperCase($filed)(String $filed){
        this.$filed = $filed;
    }
#end
}

public class Person {
    private String username; // 用户名
    private String password; // 密码
    private String address; // 地址
    public String getUsername() {
        return username;
    }
    public void setUsername(String username){
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password){
        this.password = password;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address){
        this.address = address;
    }
}