利用java反射，灵活获取对象的值

package com.paasoo.network.generate.utils;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

/**
 * @Author: bin.liu
 * @Date: 2022/4/18 5:05 下午
 * @Description:
 */
@Component
@Slf4j
public class FieldDealUtils {

    public <T> Object getValue(T t, String fieldNameString) {
        Object value = null;
        try {
            Field[] fields = t.getClass().getDeclaredFields();
            for (Field field : fields) {
                String fieldName = field.getName();
                if (!fieldName.equals(fieldNameString)) {
                    continue;
                }
                //关键。。。可访问私有变量
//                field.setAccessible(true);
                fieldNameString = fieldNameString.replaceFirst(fieldNameString.substring(0, 1), fieldNameString.substring(0, 1).toUpperCase());
                // 如果type是类类型，则前面包含"class "，后面跟类名
                Method m = t.getClass().getMethod("get" + fieldNameString);
                // 调用getter方法获取属性值
                value = m.invoke(t);
                break;
            }
            log.error("Field fail, {} have no field :{}", t.getClass().getName(), fieldNameString);
        } catch (Exception e) {
            log.error("Field error, {} have no field :{},exception:{}", t.getClass().getName(), fieldNameString, e.getMessage());
        }
        return value;
    }
}