将JSON对象映射到通用映射对象

{"employer": 1, "employee": 15}

然后,我想从中创建一个“合同”对象,将我的雇主与我的员工联系起来。

目前,我需要这样的东西

@POST
public Contract createContract(ContractRequest cr) {
    Employee employee = employeeDao.getEmployeeFromId(cr.getEmployeeId());
    Employer employer = employerDao.getEmployerFromId(cr.getEmployerId());
    Contract c = new Contract();
    c.setEmployer(employer);
    c.setEmployee(employee);
    return c;

}

这有几个缺点:我需要定义一个ContractRequest类,其唯一目的是捕获ID,然后将ID传递给员工/雇主DAO。