java - map转 json字符串

// map转 json字符串
System.out.println(JSONObject.toJSONString(params));

maven依赖

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.76</version>
        </dependency>

如何将JSONArray转为String数组