JavaBeanUtil

import com.google.common.collect.Lists;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class JavaBeanUtil {
    
    public static String map2String(Map<String, String> map) {
        List<String> fields = Lists.newArrayList();
        map.forEach((k, v) -> fields.add(k + "=" + v + "&"));
        int size = fields.size();
        String[] arrayToSort = fields.toArray(new String[size]);
        Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < size; i++) {
            sb.append(arrayToSort[i]);
        }
        return sb.toString();
    }
    
    public static Map<String, Object> bean2Map(Object obj) {
        if (obj == null) {
            return null;
        }
        Map<String, Object> map = new HashMap<String, Object>();
        try {
            BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            for (PropertyDescriptor property : propertyDescriptors) {
                String key = property.getName();
                // 過濾class屬性
                if (!key.equals("class")) {
                    // 得到property對應的getter方法
                    Method getter = property.getReadMethod();
                    Object value = getter.invoke(obj);
                    map.put(key, value);
                }
                
            }
        } catch (Exception e) {
            throw new Exception("Bean2Map Error ", e);
        }
        return map;
        
    }
}