使用反射方式获取JPA Entity的属性和值

public class ReflectEntity{
    public static String toStr(Object o){
        try{
            StringBuilder sb = new StringBuilder();
            sb.append("{");
            Class cls = o.getClass();
            Field[] fields = cls.getDeclaredFields();
            for(Field f : fields){
                f.setAccessible(true);
                sb.append("\"").append(f.getName()).append("\":\"").append(f.get(o)).append("\",");
            }
            return String.format("%s}",sb.subString(0,sb.length()-1));
        } catch(Exception e){
            return null;
        }
    }
}

@Entity
public class E{
    private String colA;
    private String colB;
    //getter, setter 略
    //在此处使用反射方法即可
    @Override
    public String toString(){
        return ReflectEntity.toStr(this);
    }
}

@Entity
@Table(name = EntitlementDbConstants.CUSTOMER_MASTER_DATA_VIEW)
public abstract class CustomerMasterDataView
{
    private static final long serialVersionUID = 1963275800615627823L; 
    @ExtendField
    @Column(name = CommonHanaDbExtendsColumnConstants.S_EX_1)
    private String sEX1;
 
    @ExtendField
    @Column(name = CommonHanaDbExtendsColumnConstants.S_EX_2)
    private String sEX2;
 
    //省略get,set方法
}

private List<Map<String, Object>> getExtensionAttributeValue(List<CustomerMasterDataView> customerMasterDataViews, String field, String type)
    {
        List<Object> noRepeakValue = new ArrayList<>();
        List<Map<String, Object>> valueList =new ArrayList<>();
        Map<String, Object> map = null;
        Object obj = null;
        String methodName = "get" + StringUtils.uncapitalize(StringUtils.replaceEach(field, new String[]     //通过get方法获取数据
        { "_" }, new String[]
        { "" }));
        for(CustomerMasterDataView customerMasterDataView:customerMasterDataViews)
        {
            try
            {
                Method method = customerMasterDataView.getClass().getMethod(methodName);
                obj = method.invoke(customerMasterDataView);// obj就是我们获取某个字段的值
            }
            catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e)
            {
                if (logger.isDebugEnabled())
                    logger.debug("Could not reflect the method {}", methodName, e);
            }
            map = formatAttributeValue(obj, type, noRepeakValue);    // 格式化数据，自定义的方法
            if(null != map)
            {
                valueList.add(map);
            }
        }
        return valueList;
    }