[{"name":"John","id":"a11","age":"30"},{"name":"Mary","id":"a12","age":"25"}] 转成List<Map<String,String>>

可以使用Java中的JSON库来解析这个JSON字符串，然后将解析后的结果转换为List<Map<String,String>>。示例代码如下：

import com.alibaba.fastjson.JSON;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        // 原始JSON字符串
        String jsonString = "[{\"name\":\"John\",\"id\":\"a11\",\"age\":\"30\"},{\"name\":\"Mary\",\"id\":\"a12\",\"age\":\"25\"}]";

        // 解析JSON字符串
        List<Map<String, String>> resultList = new ArrayList<>();
        List<Object> list = JSON.parseObject(jsonString, List.class);
        for (Object obj : list) {
            Map<String, String> map = new HashMap<>();
            Map<String, Object> tempMap = (Map<String, Object>) obj;
            for (Map.Entry<String, Object> entry : tempMap.entrySet()) {
                String key = entry.getKey();
                String value = String.valueOf(entry.getValue());
                map.put(key, value);
            }
            resultList.add(map);
        }

        // 打印结果
        System.out.println(resultList);
    }
}

输出结果为：

[{id=a11, name=John, age=30}, {id=a12, name=Mary, age=25}]