@Controller
@RequestMapping("/demo/formbean")
public class FormBeanController {
    @Autowired
    private FormBeanService formBeanService;

    @InitBinder("formBean1")
    public void initBinderFormBean1(WebDataBinder binder) {  
        binder.setFieldDefaultPrefix("formBean1.");  
    }
    @InitBinder("formBean2")
    public void initBinderFormBean2(WebDataBinder binder) {  
        binder.setFieldDefaultPrefix("formBean2.");  
    }
    @RequestMapping("/save12")
    @ResponseBody
    public ModelAndView save12(FormBean1 formBean1, FormBean2 formBean2){
        formBean2 = formBeanService.saveFromBean12(formBean1, formBean2);
        ModelAndView mav = new ModelAndView();
        mav.setViewName("redirect:/demo/formbean/edit12/"+formBean2.getId());
        return mav;
    }
    
}

<form class="form-horizontal" id="formBean1Form" method="post">
      <div class="control-group">
        <label class="control-label" for="code">FB1编号</label>
        <div class="controls">
          <input type="hidden" id="formBean1.id" name="formBean1.id" value="${formBean2.formBean1.id }" />
          <input type="text" id="formBean1.code" name="formBean1.code" value="${formBean2.formBean1.code }" />
        </div>
      </div>
      <div class="control-group">
        <label class="control-label" for="name">FB1名称</label>
        <div class="controls">
          <input type="text" id="formBean1.name" name="formBean1.name" value="${formBean2.formBean1.name }" >
        </div>
      </div>
      <div class="control-group">
        <label class="control-label" for="name">FB2编号</label>
        <div class="controls">
          <input type="hidden" id="formBean2.id" name="formBean2.id" value="${formBean2.id }" />
          <input type="text" id="formBean2.code" name="formBean2.code" value="${formBean2.code }" >
        </div>
      </div>
      <div class="control-group">
        <label class="control-label" for="name">FB2名称</label>
        <div class="controls">
          <input type="text" id="formBean2.name" name="formBean2.name" value="${formBean2.name }" >
        </div>
      </div>
      <div class="control-group">
        <div class="controls">
          <button type="submit" class="btn" onclick="this.form.action='${ctx}/demo/formbean/save12'">提交</button>
        </div>
      </div>
    </form>