fastjson中map或list和json互相转化

我们在工作中经常会用到json，市面上也有很多用于json解析的工具，我这边用的是阿里巴巴的fastjson，对应的pom文件为：

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.47</version>

</dependency>

 @Test
    public void JsonTest() {
        // list
        List<String> list = new ArrayList<>();
        list.add("a");
        list.add("b");
        // list -> json
        String listStr = JSON.toJSONString(list);
        System.out.println("list 转jsonString:" + listStr);

        // json -> list
        System.out.println("json 转 list");
        List<String> list1 = (List)JSON.parse(listStr);
        for (String a : list1) {
            System.out.println(a);
        }

        // json -> JSONArray
        JSONArray jsonArray = JSON.parseArray(listStr);
        System.out.println("jsonArray:" + jsonArray);

        // map
        Map<String, String> map = new HashMap<>();
        map.put("a", "1");
        map.put("b", "2");
        // map -> json
        String mapStr = JSON.toJSONString(map);
        System.out.println("map 转 jsonString:" +mapStr);
        // json -> map
        Map<String, String> maps = (Map)JSON.parse(mapStr);

        System.out.println("json 转 map");
        for (Iterator<String> iterator = maps.keySet().iterator(); iterator.hasNext();) {
            String key = iterator.next();
            System.out.println("key:" + key+" value:" + maps.get(key));
        }

        String a = "[\"a\",\"b\"]";
        JSONArray jsonArray2 = JSON.parseArray(a);
        System.out.println(jsonArray2);

    }

结果：

list 转jsonString:["a","b"]
json 转 list
a
b
jsonArray:["a","b"]
map 转 jsonString:{"a":"1","b":"2"}
json 转 map
key:a value:1
key:b value:2
["a","b"]