package org.myframework.util;

import java.util.Enumeration;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import net.sf.json.JSONObject;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

/**

* 提供不同的结构类型之间的数据转换成JSON (JSON,POJO,HttpServletRequest ) -- >MAP

*

* @author Administrator

*

*/

public class MapUtil {

private static Log log = LogFactory.getLog(MapUtil.class);

/**

* @param request

* @param emptyToNull

* @return

*/

public static Map<String, Object> getMapFromRequest(

HttpServletRequest request, boolean emptyToNull) {

Map<String, Object> map = new HashMap<String, Object>();

for (Enumeration elements = request.getParameterNames(); elements

.hasMoreElements();) {

String key = (String) elements.nextElement();

String value = request.getParameter(key);

// 将空字符串转化为NULL

if (emptyToNull)

value = "".equals(value) ? null : value;

map.put(key, value);

}

log.debug(map);

return map;

}

/**

* @param request

* @return

*/

public static Map getMapFromRequest(HttpServletRequest request) {

return getMapFromRequest(request, true);

}

/**

* 将JSON对象转换为Map

*

* @param jo

* @return

*/

public static Map<String, Object> getMapFromJSONObject(JSONObject jo) {

Map<String, Object> map = new HashMap<String, Object>();

for (Iterator<String> i = jo.keys(); i.hasNext();) {

String key = (String) i.next();

Object value = jo.get(key);

map.put(key, value);

}

return map;

}

/**

* 将JSON字符串转换为Map

*

* @param jo

* @return

*/

public static Map<String, Object> getMapFromJSONString(String joString) {

JSONObject jo = JSONObject.fromObject(joString);

return getMapFromJSONObject(jo);

}

/**

* 将POJO转换为Map

*

* @param jo

* @return

*/

public static Map<String, Object> getMapFromPojo(Object pojo) {

JSONObject jo = JSONObject.fromObject(pojo);

return getMapFromJSONObject(jo);

}

}