spring mvc 接受多对象的处理
2016-07-11 18:08
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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
Java代码
/**
* 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
Java代码
/**
* 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
Xml代码
<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
Java代码
@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
Html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>
-------------------------------------------------------------分割线----------------------------------------------------------------
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
Java代码
@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
Html代码
<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。
首先声明一个注解类，用于对传值对象的声明
Java代码
/**
* 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
Java代码
/**
* 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
Xml代码
<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
Java代码
@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
Html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="${event.submitTel }"/></td>
-------------------------------------------------------------分割线----------------------------------------------------------------
经过一段时间的使用，发现此方法对于传值有很多限制，复杂情况处理很不理想。特意补充官方推荐用法。
controller端直接使用注解声明
Java代码
@Controller
@RequestMapping("/demo/formbean")
public class FormBeanController {
@Autowired
private FormBeanService formBeanService;
@InitBinder("formBean1")
public void initBinderFormBean1(WebDataBinder binder) {
binder.setFieldDefaultPrefix("formBean1.");
}
@InitBinder("formBean2")
public void initBinderFormBean2(WebDataBinder binder) {
binder.setFieldDefaultPrefix("formBean2.");
}
@RequestMapping("/save12")
@ResponseBody
public ModelAndView save12(FormBean1 formBean1, FormBean2 formBean2){
formBean2 = formBeanService.saveFromBean12(formBean1, formBean2);
ModelAndView mav = new ModelAndView();
mav.setViewName("redirect:/demo/formbean/edit12/"+formBean2.getId());
return mav;
}
}
html方式相差不大
Html代码
<form class="form-horizontal" id="formBean1Form" method="post">
<div class="control-group">
<label class="control-label" for="code">FB1编号</label>
<div class="controls">
<input type="hidden" id="formBean1.id" name="formBean1.id" value="${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。
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