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Java把Map轉(zhuǎn)為對(duì)象的實(shí)現(xiàn)代碼

更新時(shí)間：2023年08月29日 10:55:33 作者：Best_Liu~

在項(xiàng)目開(kāi)發(fā)中,經(jīng)常碰到map轉(zhuǎn)實(shí)體對(duì)象或者對(duì)象轉(zhuǎn)map的場(chǎng)景,工作中,很多時(shí)候我們可能比較喜歡使用第三方j(luò)ar包的API對(duì)他們進(jìn)行轉(zhuǎn)化,但這里,我想通過(guò)反射的方式對(duì)他們做轉(zhuǎn)化,感興趣的同學(xué)跟著小編來(lái)看看吧

1、map轉(zhuǎn)java對(duì)象

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.mes.common.core.utils.StringUtils;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
     * @Author: best_liu
     * @Description: map轉(zhuǎn)java對(duì)象
     * @Date: 8:35 2022/3/22
     **/
    public static Object convertToObject(Class clazz, Map<String, Object> map) throws
            IntrospectionException, InstantiationException, IllegalAccessException {
        BeanInfo bi = Introspector.getBeanInfo(clazz);
        Object obj = clazz.newInstance();
        PropertyDescriptor[] pds = bi.getPropertyDescriptors();
        String pName;
        for (PropertyDescriptor pd : pds) {
            pName = pd.getName();
            if (map.containsKey(pName)) {
                try {
                    if (pd.getPropertyType().getName().equals("java.lang.Long")) {
                        if(StringUtils.isNotEmpty(map.get(pName).toString())){
                            pd.getWriteMethod().invoke(obj, Long.parseLong(map.get(pName).toString()));
                        }
//                        else{
//                            pd.getWriteMethod().invoke(obj, map.get(pName));
//                        }
                    } else {
                        pd.getWriteMethod().invoke(obj, map.get(pName));
                    }
                } catch (Exception ex) {
                    Logger.getLogger(MapUtil.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        return obj;
    }

2、java對(duì)象轉(zhuǎn)map

/**
     * @Author: best_liu
     * @Description: java對(duì)象轉(zhuǎn)map
     * @Date: 8:35 2022/3/22
     **/
    public static Map<String, String> objectToMap(Object obj) {
        if (obj == null) {
            return null;
        }
        Map<String, String> map = new HashMap<String, String>();
        try {
            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();
                Object value = getter != null ? getter.invoke(obj) : null;
                String v = null;
                if (value != null) {
                    v = value.toString();
                }
                map.put(key, v);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return map;
    }
    /**
     * @Author: best_liu
     * @Description: java對(duì)象轉(zhuǎn)map
     * @Date: 8:35 2022/3/22
     **/
    public static Map<String, Object> objectToMapObj(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();
                if (key.compareToIgnoreCase("class") == 0) {
                    continue;
                }
                Method getter = property.getReadMethod();
                Object value = getter != null ? getter.invoke(obj) : null;
                map.put(key, value);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return map;
    }

3、Map轉(zhuǎn)換為Json字符串

 /**
     * @Author: best_liu
     * @Description: Map轉(zhuǎn)換為Json字符串
     * @Date: 8:35 2022/3/22
     **/
    public static String mapToJsonString(Map map) {
        JSONObject json = new JSONObject();
        Iterator<Map.Entry<String, String>> entries = map.entrySet().iterator();
        while (entries.hasNext()) {
            Map.Entry<String, String> entry = entries.next();
            json.put(entry.getKey(), entry.getValue());
        }
        return json.toString();
    }

4、Json字符串轉(zhuǎn)換為Map

/**
     * @Author: best_liu
     * @Description: Json字符串轉(zhuǎn)換為Map
     * @Date: 8:35 2022/3/22
     **/
    public static Map<String, Long> jsonStringToMap(String str) {
        Map<String, Long> map = (Map<String, Long>) JSON.parse(str);
        return map;
    }

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