通过反射自动封装表单字段

package cn.jbit.util;

import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URLDecoder;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.spi.ServiceRegistry.Filter;
import javax.servlet.http.HttpServletRequest;

public class RequestUtil {
public static Object getObject(HttpServletRequest request, Class clazz,
String enc) throws UnsupportedEncodingException,
IntrospectionException, InstantiationException, IllegalAccessException {

Field[] fields = clazz.getDeclaredFields();
Object obj = clazz.newInstance();
request.setCharacterEncoding(enc);
Map<String, String> map = new HashMap<String, String>();
if (request.getMethod().equals("GET")) {
System.out.println("-----------GET--------------------");
String query = URLDecoder.decode(request.getQueryString(), enc);
String[] str = query.split("&");
for (String string : str) {
try {
map.put(string.split("=")[0], string.split("=")[1]);
} catch (Exception e) {
e.printStackTrace();
}
}
} else {
System.out.println("-----------POST--------------------");
Map<String, String[]> parmmap = request.getParameterMap();
for (String key : parmmap.keySet()) {
try {
map.put(key, parmmap.get(key)[0]);
} catch (Exception e) {
e.printStackTrace();
}
}
}
for (Field field : fields) {
try {
PropertyDescriptor pd = new PropertyDescriptor(field.getName(),
clazz);
Method seter = pd.getWriteMethod();
if (field.getType().getName().equals(int.class.getName())
|| field.getType().getName()
.equals(Integer.class.getName())) {
seter.invoke(obj, Integer.valueOf(map.get(field.getName())));
} else if (field.getType().getName()
.equals(Date.class.getName())) {
SimpleDateFormat sdf = new SimpleDateFormat();
Date date = sdf.parse(map.get(field.getName()));
seter.invoke(obj, date);
} else if (field.getType().getName()
.equals(Double.class.getName())
|| field.getType().getName()
.equals(double.class.getName())) {
seter.invoke(obj, Double.valueOf(map.get(field.getName())));
} else if (field.getType().getName()
.equals(String.class.getName())) {
seter.invoke(obj, map.get(field.getName()));
}

} catch (Exception e) {
System.out.println("异常 了");
}

}
return obj;
}
}