spring mvc 接受多對象的處理

spring mvc感覺很好用，尤其是對接收對象參數的自動綁定非常簡便，但對於同時傳多個對象時有些困擾。同時項目並沒有直接使用spring的formtag。從網上學來的多對象傳值，自己優化了下，原文找不到出處了這裏記錄下。

首先聲明一個註解類，用於對傳值對象的聲明

 

/**
 * 處理spring mvc 對象綁定註解
 * @author lee
 *
 */
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestBean {
    String value() default "_def_param_name";
}

 然後是一個對WebArgumentResolver的實現類，對象參數綁定主要是這個類來處理

 

 

/**
 * 對象傳值的參數綁定處理
 * @author lee
 *
 */
public class BeanArgumentResolver implements WebArgumentResolver {

    @SuppressWarnings("rawtypes")
    public Object resolveArgument(MethodParameter param, NativeWebRequest request){
        RequestBean requestBean = param.getParameterAnnotation(RequestBean.class);
        try{
            if (requestBean != null) {
                String _param = requestBean.value();
                if (_param.equals("_def_param_name")) {
                    _param = param.getParameterName();
                }
                Class clazz = param.getParameterType();
                Object object = clazz.newInstance();
                HashMap<String, String[]> paramsMap = new HashMap<String, String[]>();
                Iterator<String> itor = request.getParameterNames();
                while (itor.hasNext()) {
                    String webParam = (String) itor.next();
                    String[] webValue = request.getParameterValues(webParam);
                    List<String> webValueList = new ArrayList<String>();
                    for(int i = 0;i<webValue.length;i++){
                        if(webValue[i]!=null&&!"".equals(webValue[i])){
                            webValueList.add(webValue[i]);
                        }
                    }
                    if (webParam.startsWith(_param)&&!webValueList.isEmpty()) {
                        paramsMap.put(webParam, webValueList.toArray(new String[webValueList.size()]));
                    }
                }
                BeanWrapper obj = new BeanWrapperImpl(object);
                obj.registerCustomEditor(Date.class, null, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"), true));
                System.out.println(obj.findCustomEditor(Date.class, null).getAsText());

                for (String propName : paramsMap.keySet()) {
                    Object propVals = paramsMap.get(propName);
                    String[] props = propName.split("\\.");
                    if (props.length == 2) {
                        obj.setPropertyValue(props[1], propVals);
                    } else if (props.length == 3) {
                        Object tmpObj = obj.getPropertyValue(props[1]);
                        if (tmpObj == null)
                            obj.setPropertyValue(props[1], obj.getPropertyType(props[1]).newInstance());
                        obj.setPropertyValue(props[1] + "." + props[2], propVals);
                    }

                }
                return object;
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return WebArgumentResolver.UNRESOLVED;
    }
}

 兩個類寫好後對mvc配置文件進行配置

 

 

<mvc:annotation-driven>
        <mvc:argument-resolvers>
            <bean class="xx.xx.xx.xx.BeanArgumentResolver" />
        </mvc:argument-resolvers>
        <mvc:message-converters register-defaults="true">
            <!-- 將StringHttpMessageConverter的默認編碼設爲UTF-8 -->
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg value="UTF-8" />
            </bean>
            <!-- 將Jackson2HttpMessageConverter的默認格式化輸出設爲true -->
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="prettyPrint" value="true"/>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

 接下來就是使用了mvc的controller方法如下

 

@RequestMapping(value="/saveEvent")
@ResponseBody
public AjaxResult saveEvent(@RequestBean Event event){
    event =eventService.saveTemporaryEvent(event);
    return AjaxResult.objectResult(event);
}

 頁面form表單代碼

<td align="right">客戶代碼：</td>
            <td><input type="hidden" name="event.submitUser.userId" value="${event.submitUser.userId }" /></td>
            <td align="right">客戶電話：</td>
            <td><input class="inpname_" type="text" id="submitTel" name="event.submitTel" value="${event.submitTel }"/></td>

 

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經過一段時間的使用，發現此方法對於傳值有很多限制，複雜情況處理很不理想。特意補充官方推薦用法。

controller端直接使用註解聲明

@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;
    }

}

 html方式相差不大

<form class="form-horizontal" id="formBean1Form" method="post">
      <div class="control-group">
        <label class="control-label" for="code">FB1編號</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名稱</label>
        <div class="controls">
          <input type="text" id="formBean1.name" name="formBean1.name" value="${formBean2.formBean1.name }" >
        </div>
      </div>
      <div class="control-group">
        <label class="control-label" for="name">FB2編號</label>
        <div class="controls">
          <input type="hidden" id="formBean2.id" name="formBean2.id" value="${formBean2.id }" />
          <input type="text" id="formBean2.code" name="formBean2.code" value="${formBean2.code }" >
        </div>
      </div>
      <div class="control-group">
        <label class="control-label" for="name">FB2名稱</label>
        <div class="controls">
          <input type="text" id="formBean2.name" name="formBean2.name" value="${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>

 官方方法是用性更強，對於複雜情況如集合多級嵌套對象等處理完美，計較推薦。