神器降临，从Form表单接收JavaBean对象，支持时间日期类型，支持前缀
神器降临，可以从Form表单直接接收一个JavaBean对象，而且支持多层次属性注入，支持java.util.Date类型的直接接收，支持指定属性前缀。
用到的jar包：[commons-beanutils-1.8.0.jar](http://central.maven.org/maven2/commons-beanutils/commons-beanutils/1.8.0/commons-beanutils-1.8.0.jar)
工具类源码：BeanHelper
```
package com.itshidu.commons.util;
import java.lang.reflect.InvocationTargetException;
import java.util.Date;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.beanutils.converters.DateConverter;
/**
* Bean辅助工具，可以从Form表单中直接读取bean对象，也可以为bean对象设置多级属性
* @author Mr.Xia v1.0 Date：2017年1月14日02:43:37
*/
public class BeanHelper {
static {
DateConverter converter = new DateConverter();
converter.setPatterns(new String[]{"yyyy-MM-dd HH:mm:ss","yyyy-MM-dd"});
ConvertUtils.register(converter, Date.class);
}
/**
* 使用表单数据构建bean对象（只注入名称匹配的属性）
* @param request
* @param prefix
* @param c
* @return
* @throws IllegalAccessException
* @throws InvocationTargetException
* @throws InstantiationException
* @throws SecurityException
* @throws NoSuchMethodException
*/
public static <T> T bean(HttpServletRequest request,Class<T> c) throws IllegalAccessException, InvocationTargetException, InstantiationException, SecurityException, NoSuchMethodException{
return (T) bean(request, null, c);
}
/**
* 使用表单数据构建bean对象（只注入名称匹配的属性）
* prefix用于指定前缀,当值为a时会处理以a.开头的参数（例如a.name,a.age），null或""时代表无前缀
* @param request
* @param prefix
* @param c
* @return
* @throws IllegalAccessException
* @throws InvocationTargetException
* @throws InstantiationException
* @throws SecurityException
* @throws NoSuchMethodException
*/
public static <T> T bean(HttpServletRequest request,String prefix,Class<T> c) throws IllegalAccessException, InvocationTargetException, InstantiationException, SecurityException, NoSuchMethodException{
T obj = c.newInstance();
Enumeration<?> pNames=request.getParameterNames();
while(pNames.hasMoreElements()){
String name=(String)pNames.nextElement();
String[] value=request.getParameterValues(name);
if(prefix!=null&&!prefix.isEmpty()){
if(name.startsWith(prefix+".")){
name = name.substring(prefix.length()+1);
}else{
break;
}
}
setProperty(obj, name, value);
}
return (T) obj;
}
/**
* 设置对象的属性,pname支持多级，value可以是数组或对象
* 例1：setProperty(obj, "username","悟空");
* 例2：setProperty(obj, "category.parent.id",12);
* 例3：setProperty(obj, "title",12);
* @param obj
* @param pname
* @param value
* @throws IllegalAccessException
* @throws InvocationTargetException
* @throws InstantiationException
* @throws NoSuchMethodException
*/
static void setProperty(Object obj,String pname,Object value) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException, InstantiationException{
if(pname.contains(".")){
String fn1 = pname.substring(0,pname.indexOf("."));
if(PropertyUtils.getPropertyType(obj, fn1)==null)return;
String fn2 = pname.substring(pname.indexOf(".")+1,pname.length());
BeanUtils.setProperty(obj, fn1, PropertyUtils.getPropertyType(obj, fn1).newInstance());
setProperty(PropertyUtils.getProperty(obj, fn1), fn2,value);
}else{
BeanUtils.setProperty(obj, pname, value);
}
}
}
```