java 一个Map的使用帮助类

package Pay.WeChatPay.Utils;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class MapUtil {

    public static Map toMap(Object object){
        Map map = new HashMap();
        Field[] fields = object.getClass().getDeclaredFields();
        for (Field field : fields) {
            Object obj;
            try {
                obj = field.get(object);
                if(obj!=null){
                    map.put(field.getName(), obj);
                }
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        return map;
    }
    /**
     * Map转对象
     * @param map
     * @param beanClass
     * @return
     * @throws Exception
     */
       public static Object mapToObject(Map map, Class beanClass)  {    
            if (map == null)   
                return null;    
            Object obj = null;
          try {
                 obj = beanClass.newInstance();  
      
            BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());    
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();    
            for (PropertyDescriptor property : propertyDescriptors) {  
                Method setter = property.getWriteMethod();    
                if (setter != null) {  
                    setter.invoke(obj, map.get(property.getName()));   
                }  
            }  
            } catch (Exception e) {
                return null;
            }
      
            return obj;  
        }   
    /**
     * 使用key对map排序
     * @param map
     * @return
     */
    public static Map orderByKey(Map map){
        HashMap tempMap = new LinkedHashMap();
        List> infoIds = new ArrayList>( map.entrySet());

        Collections.sort(infoIds, new Comparator>() {
            public int compare(Map.Entry o1,Map.Entry o2) {
                return (o1.getKey()).toString().compareTo(o2.getKey());
            }
        });

        for (int i = 0; i < infoIds.size(); i++) {
            Map.Entry item = infoIds.get(i);
            tempMap.put(item.getKey(), item.getValue());
        }
        return tempMap;
    }

    
    /**
     * 转换对象为map
     * @param object        对象
     * @param ignore        不添加的属性数组
     * @return
     */
    public static Map objectToMap(Object object,String... ignore){
        Map tempMap = new LinkedHashMap();
        for(Field f : object.getClass().getDeclaredFields()){//获取反射所有申明的字段
            if(!f.isAccessible()){
                f.setAccessible(true);//启用和禁用访问安全检查的开关,并不是为true就能访问为false就不能访问
            }
            boolean ig = false;
            if(ignore!=null&&ignore.length>0){
                for(String i : ignore){
                    if(i.equals(f.getName())){
                        ig = true;
                        break;
                    }
                }
            }
            if(ig){
                continue;
            }else{
                Object o = null;
                try {
                    o = f.get(object);//拿到object实例的值
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
                tempMap.put(f.getName(), o==null?"":o.toString());//制作成键值对
            }
        }
        return tempMap;
    }

    /**
     * url 参数串连
     * @param map
     * @param keyLower
     * @param valueUrlencode
     * @return
     */
    public static String mapJoin(Map map,boolean keyLower,boolean valueUrlencode){
        StringBuilder stringBuilder = new StringBuilder();
        for(String key :map.keySet()){
            if(map.get(key)!=null&&!"".equals(map.get(key))){
                try {
                    String temp = (key.endsWith("_")&&key.length()>1)?key.substring(0,key.length()-1):key;
                    stringBuilder.append(keyLower?temp.toLowerCase():temp)
                                 .append("=")
                                 .append(valueUrlencode?URLEncoder.encode(map.get(key),"utf-8").replace("+", "%20"):map.get(key))
                                 .append("&");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }
        }
        if(stringBuilder.length()>0){
            stringBuilder.deleteCharAt(stringBuilder.length()-1);
        }
        return stringBuilder.toString();
    }

    /**
     * 简单 xml 转换为 Map
     * @param reader
     * @return
     */
    public static Map xmlToMap(String xml){
        try {
            DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document document = documentBuilder.parse(new ByteArrayInputStream(xml.getBytes()));
            Element element = document.getDocumentElement();
            NodeList nodeList = element.getChildNodes();
            Map map = new LinkedHashMap();
            for(int i=0;i");  
            for (Iterator it = set.iterator(); it.hasNext();) {  
                String key = (String) it.next();  
                Object value = map.get(key);  
                if (null == value)  
                    value = "";  
                if (value.getClass().getName().equals("java.util.ArrayList")) {  
                    ArrayList list = (ArrayList) map.get(key);  
                    sb.append("<" + key + ">");  
                    for (int i = 0; i < list.size(); i++) {  
                        HashMap hm = (HashMap) list.get(i);  
                        mapToXML(hm, sb);  
                    }  
                    sb.append("");  
      
                } else {  
                    if (value instanceof HashMap) {  
                        sb.append("<" + key + ">");  
                        mapToXML((HashMap) value, sb);  
                        sb.append("");  
                    } else {  
                        sb.append("<" + key + ">" + value + "");  
                    }                   
                }     
            }  
            sb.append("");  
           return sb.toString();
        }  
     /**
      * 将map转成xmlstr
      * @param map
      * @return
      */
     public static String mapToXmlStr(Map map){  
            String xmlStr = null;  
            StringBuffer sbf = new StringBuffer();  
            sbf.append("");  
            for(Entry s: map.entrySet()){  
                  
                sbf.append("<")  
                    .append(s.getKey())  
                    .append(">")  
                    .append(s.getValue())  
                    .append("");  
                      
            }  
            sbf.append("");  
            xmlStr = sbf.toString();  
            return xmlStr;  
        }  
}