[Java 基础]ResultSet 指定field映射到Pojo对象的Map

现在有一个需求，mysql查询记录映射到List<pojo>中，其中pojo某个字段是Map类型，需要将查询记录中这列映射到Map中，否则默认会当作String映射，以下为当前代码：

public List<T> mapRersultSetToObject(ResultSet rs, Class outputClass) {

        List<T> outputList = null;
        try {
            // make sure resultset is not null
            if (rs != null) {
                // check if outputClass has 'Entity' annotation
                if (outputClass.isAnnotationPresent(Entity.class)) {
                    // get the resultset metadata
                    ResultSetMetaData rsmd = rs.getMetaData();
                    // get all the attributes of outputClass
                    Field[] fields = outputClass.getDeclaredFields();
                    while (rs.next()) {
                        T bean = (T) outputClass.newInstance();
                        for (int _iterator = 0; _iterator < rsmd.getColumnCount(); _iterator++) {
                            // getting the SQL column name
                            String columnName = rsmd.getColumnName(_iterator + 1);
                            // reading the value of the SQL column
                            Object columnValue = rs.getObject(_iterator + 1);
                            // iterating over outputClass attributes to check if
                            // any attribute has 'Column' annotation with
                            // matching 'name' value
                            for (Field field : fields) {
                                if (field.isAnnotationPresent(Column.class)) {
                                    Column column = field.getAnnotation(Column.class);
                                    if (column.name().equalsIgnoreCase(columnName) && columnValue != null) {
                                        BeanUtils.setProperty(bean, field.getName(), columnValue);
                                        break;
                                    }
                                }
                            }
                        }
                        if (outputList == null) {
                            outputList = new ArrayList<T>();
                        }
                        outputList.add(bean);
                    }

                } else {
                    // throw some error
                }
            } else {
                return null;
            }
        }

解决方案，如果设置属性时每次都检查字段类型，效率会比较低，通过发生异常捕获，然后再转化的方式，如下代码所示：

if (column.name().equalsIgnoreCase(columnName) && columnValue != null) {
                                        try{
                                            BeanUtils.setProperty(bean, field.getName(), columnValue);
                                        }catch (ConversionException exception){
                                            if(field.getType().equals(Map.class)){
                                                BeanUtils.setProperty(bean, field.getName(), JSON.parse(String.valueOf(columnValue)));
                                            }

                                        }
                                        break;
                                    }