spring mvc 接受多对象的处理

spring mvc感觉很好用，尤其是对接收对象参数的自动绑定非常简便，但对于同时传多个对象时有些困扰。同时项目并没有直接使用spring的formtag。从网上学来的多对象传值，自己优化了下，原文找不到出处了这里记录下。

首先声明一个注解类，用于对传值对象的声明

 

/**
 * 处理spring mvc 对象绑定注解
 * @author lee
 *
 */
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestBean {
	String value() default "_def_param_name";
}

 然后是一个对WebArgumentResolver的实现类，对象参数绑定主要是这个类来处理

 

 

/**
 * 对象传值的参数绑定处理
 * @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;
	}
}

 两个类写好后对mvc配置文件进行配置

 

 

<mvc:annotation-driven>
		<mvc:argument-resolvers>
			<bean class="xx.xx.xx.xx.BeanArgumentResolver" />
		</mvc:argument-resolvers>
		<mvc:message-converters register-defaults="true">
			<!-- 将StringHttpMessageConverter的默认编码设为UTF-8 -->
			<bean class="org.springframework.http.converter.StringHttpMessageConverter">
		    	<constructor-arg value="UTF-8" />
			</bean>
			<!-- 将Jackson2HttpMessageConverter的默认格式化输出设为true -->
			<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="prettyPrint" value="true"/>
            </bean>	
  		</mvc:message-converters>
	</mvc:annotation-driven>

 接下来就是使用了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);
}

 页面form表单代码

<td align="right">客户代码：</td>
            <td><input type="hidden" name="event.submitUser.userId" value="${event.submitUser.userId }" /></td>
            <td align="right">客户电话：</td>
            <td><input class="inpname_" type="text" id="submitTel" name="event.submitTel" value="${event.submitTel }"/></td>

 

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经过一段时间的使用，发现此方法对于传值有很多限制，复杂情况处理很不理想。特意补充官方推荐用法。

controller端直接使用注解声明

@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>

 官方方法是用性更强，对于复杂情况如集合多级嵌套对象等处理完美，计较推荐。

评论

2 楼 ly10265139 2015-12-24  

1 楼 chenlei1728 2015-01-13  

没看太懂，能具体的聊一下吗？可以的话，加我QQ：174312406