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提供java常用的、流行的工具方法,减少项目冗余代码
There is a newer version: 0.3
package com.seejoke.maptobean;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Map;


/**
 * map 转换Object
 *
 * @author tlj
 */
public class MapToBean {

    /**
     * 将Map对象通过反射机制转换成Bean对象
     *
     * @param map   存放数据的map对象
     * @param clazz 待转换的class
     * @return 转换后的Bean对象
     * @throws Exception 异常
     */
    public static Object mapToBean(Map map, Class clazz) throws Exception {
        Object obj = clazz.newInstance();
        if (map != null && map.size() > 0) {
            for (Map.Entry entry : map.entrySet()) {
                String propertyName = entry.getKey();       //属性名  
                Object value = entry.getValue();
                String setMethodName = "set"
                        + propertyName.substring(0, 1).toUpperCase()
                        + propertyName.substring(1);
                Field field = getClassField(clazz, propertyName);
                if (field == null)
                    continue;
                Class fieldTypeClass = field.getType();
                value = convertValType(value, fieldTypeClass);
                try {
                    clazz.getMethod(setMethodName, field.getType()).invoke(obj, value);
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                }
            }
        }
        return obj;
    }

    /**
     * 获取指定字段名称查找在class中的对应的Field对象(包括查找父类)
     *
     * @param clazz     指定的class
     * @param fieldName 字段名称
     * @return Field对象
     */
    private static Field getClassField(Class clazz, String fieldName) {
        if (Object.class.getName().equals(clazz.getName())) {
            return null;
        }
        Field[] declaredFields = clazz.getDeclaredFields();
        for (Field field : declaredFields) {
            if (field.getName().equals(fieldName)) {
                return field;
            }
        }

        Class superClass = clazz.getSuperclass();
        if (superClass != null) {// 简单的递归一下
            return getClassField(superClass, fieldName);
        }
        return null;
    }

    /**
     * 将Object类型的值，转换成bean对象属性里对应的类型值
     *
     * @param value          Object对象值
     * @param fieldTypeClass 属性的类型
     * @return 转换后的值
     */
    private static Object convertValType(Object value, Class fieldTypeClass) {
        Object retVal = null;
        if (Long.class.getName().equals(fieldTypeClass.getName())
                || long.class.getName().equals(fieldTypeClass.getName())) {
            retVal = Long.parseLong(value.toString());
        } else if (Integer.class.getName().equals(fieldTypeClass.getName())
                || int.class.getName().equals(fieldTypeClass.getName())) {
            retVal = 0;
            if (value != null) {
                retVal = Integer.parseInt(value.toString());
            }
        } else if (Float.class.getName().equals(fieldTypeClass.getName())
                || float.class.getName().equals(fieldTypeClass.getName())) {
            retVal = Float.parseFloat(value.toString());
        } else if (Double.class.getName().equals(fieldTypeClass.getName())
                || double.class.getName().equals(fieldTypeClass.getName())) {
            retVal = Double.parseDouble(value.toString());
        } else if (BigDecimal.class.getName().equals(fieldTypeClass.getName())
                || BigDecimal.class.getName().equals(fieldTypeClass.getName())) {
            retVal = new BigDecimal(value.toString());
        } else {
            retVal = value;
        }
        return retVal;
    }

    /**
     * 对象转map
     *
     * @param obj
     * @return
     * @throws Exception
     */
    public static Map objectToMap(Object obj) throws Exception {
        if (obj == null) {
            return null;
        }
        Map map = new HashMap();
        BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (PropertyDescriptor property : propertyDescriptors) {
            String key = property.getName();
            if (key.compareToIgnoreCase("class") == 0) {
                continue;
            }
            Method getter = property.getReadMethod();
            //类型
            Object value = getter != null ? getter.invoke(obj) : null;
            if (value == null || value == "") {
                map.put(key, (String) value);
            } else {
                map.put(key, String.valueOf(value));
            }

        }
        return map;
    }

    public static void main(String[] args) {
//    	InCreateOrderVO order =new InCreateOrderVO();
//    	order.setNotifyUrl("aaa");
//    	order.setMerchantNo("123");
//    	try {
//			System.out.println(objectToMap(order));
//		} catch (Exception e) {
//			e.printStackTrace();
//		}
    }
}