Java反射使用实例（http实体类转换）

package com.netfinworks.site.ext.service.facade.converter;


import java.lang.reflect.Field;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Map;


import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.lang.StringUtils;


import com.yongda.site.core.common.annotation.HttpField;
import com.yongda.site.service.personal.facade.request.FastRegisterRequest;


/**
 * http请求转换
 * @desc 
 * @author slong
 * @version: 2016年4月25日 下午5:40:46
 */
public class HttpRequestConvert {

public static <T> T convert2Request(Map<String,String> paramsMap,Class<T> clz){
T obj = null;
try {
obj = clz.newInstance();
copyMapToBean(paramsMap, clz, obj);
} catch (Exception e) {
} 
return obj;
}


public static <T> T copyMapToBean(Map<String,String> paramsMap,Class<T> clz,T obj){
if(obj == null){
try {
obj = clz.newInstance();
} catch (Exception e1) {
return null;
}
}
        Field[] declaredFields = clz.getDeclaredFields();
        for(Field declaredField:declaredFields){
        if((declaredField.getModifiers() & java.lang.reflect.Modifier.STATIC) == java.lang.reflect.Modifier.STATIC){
        continue;
        }
        String httpKey = declaredField.getName();
        Object propValue = null;
        HttpField field = declaredField.getAnnotation(HttpField.class);
        Class<?> declaredFieldClass = declaredField.getType();
        if(field != null){
        if(StringUtils.isNotBlank(field.name())){
        httpKey = field.name();
        }
        }
    String value = paramsMap.get(httpKey);
if(StringUtils.isNotBlank(value)){
if(declaredFieldClass.getName().equals("java.util.Date")){
if(field != null && StringUtils.isNotBlank(field.dateFormat()))
try {
propValue = new SimpleDateFormat(field.dateFormat()).parse(value);
} catch (ParseException e) {
propValue = null;
}
} else if (declaredFieldClass.getName().equals("java.lang.String")) {
propValue = value;
} else if (declaredFieldClass.getName().equals("java.lang.String")) {
propValue = value;
} else if (declaredFieldClass.getName().equals("java.lang.Integer") || declaredFieldClass.getName().equals("int")) {
propValue = new java.lang.Integer(value.toString());
} else if (declaredFieldClass.getName().equals("java.lang.Long")  || declaredFieldClass.getName().equals("long")) {
propValue = new java.lang.Long(value.toString());
} else if (declaredFieldClass.getName().equals("java.lang.Double") || declaredFieldClass.getName().equals("double")) {
propValue = new java.lang.Double(value.toString());
} else if (declaredFieldClass.getName().equals("java.lang.Float") || declaredFieldClass.getName().equals("Float")) {
propValue = new java.lang.Float(value.toString());
} else if (declaredFieldClass.getName().equals("java.lang.Short")) {
propValue = new java.lang.Short(value.toString());
} else if (declaredFieldClass.getName().equals("java.lang.Byte")) {
propValue = new java.lang.Byte(value.toString());
} else if (declaredFieldClass.getName().equals("java.lang.Boolean") || declaredFieldClass.getName().equals("boolean")) {
propValue = new java.lang.Boolean(value.toString());
}
try {
PropertyUtils.setProperty(obj, declaredField.getName(), propValue);
} catch (Exception e) {

}
}
        }
        Class<? super T> superClass = clz.getSuperclass();
        if(superClass != null){
        copyMapToBean(paramsMap, superClass, obj);
        }
        return obj;   
}

public static void main(String[] args) {
Map<String,String> map = new HashMap<String, String>();
map.put("account", "1234567");
map.put("_service", "create_member");
map.put("deviceid", "app1234");
FastRegisterRequest req = convert2Request(map, FastRegisterRequest.class);
System.out.println(req);
}
}