map与对象相互转换

map与对象相互转换

工具类，不使用第三方依赖，纯反射实现

package com.qitai.maputil;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ObjectToMapUtil {
/**
    * object对象转map
    * @param o
    * @return
    * @throws Exception
*/
public static Map<String,Object> objectToMap(Object o) throws Exception {
   Map<String,Object> objectMap = new HashMap<>();
   Class oClass = o.getClass();
   Field[] fields = oClass.getDeclaredFields();
   List<String> fieldNames = new ArrayList<>();
   for (Field field:fields){
       String fieldName = field.getName();
       fieldNames.add(fieldName);
       PropertyDescriptor descriptor = new PropertyDescriptor(field.getName(), oClass);
       Method method = descriptor.getReadMethod();
       if ("class java.lang.String".equals(field.getType().toString())||
               "int".equals(field.getType().toString())||
               "class java.lang.Integer".equals(field.getType().toString())||
               "class java.util.Date".equals(field.getType().toString())||
               "class java.lang.Double".equals(field.getType().toString())||
               "class java.lang.Boolean".equals(field.getType().toString())||
               "class java.lang.Short".equals(field.getType().toString())) {
           objectMap.put(fieldName,method.invoke(o));
       }else {
           objectMap.put(fieldName,objectToMap(method.invoke(o)));
       }
   }
   return objectMap;
}
/**
* map转对象
* @param tClass
* @param map
* @param <T>
* @return
* @throws Exception
*/
	public static <T> T mapToObject(Class<T> tClass,Map<String,Object> map) throws Exception {
   T t = tClass.newInstance();
   Field[] fields = tClass.getDeclaredFields();
   List<String> fieldNames = new ArrayList<>();
   for (Field field:fields){
       String fieldName = field.getName();
       fieldNames.add(fieldName);
   }
   for (String key:map.keySet()){
       if (fieldNames.contains(key)){
           for (Field field:fields){
               String fieldName = field.getName();
               fieldNames.add(fieldName);
               if (fieldName.equals(key)){
                   PropertyDescriptor descriptor = new PropertyDescriptor(field.getName(), tClass);
                   Method method = descriptor.getWriteMethod();
                   if (map.get(key) instanceof Map){
                       Class c1 = Class.forName(field.getType().toString().replace("class ",""));
                       method.invoke(t,mapToObject(c1,(Map<String, Object>) map.get(key)));
                   } else {
                       method.invoke(t,map.get(key));
                   }
               }
           }
       }
   }
   return t;
}
}

标签：map,toString,转换,field,fieldName,相互,java,class
来源： https://www.cnblogs.com/hqt-bky/p/16197875.html