开发中经常遇到将字符串转成json和字符串转成json属组的方法，网上搜到的方法，好多都是不好用的，今天这里记录一下方便自己今后查看，也提供给需要的人。

依赖：

  <!-- 处理json -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.56</version>
        </dependency>

代码:

public static void main(String[] args) {

        //字符串转json对象
        String jsonStr = "{ expires_in: 2592000,\n" +
                "refresh_token: \"122.2582432a1cf40bc91ca31c10b5a6c038.Y3l6ETFhyjmS8ABFNRv3cPcJzKO-Pl9M4TCnUpx.LHh1Vw\",\n" +
                "access_token: \"121.fd4b4277dba7a65a51cf370d0e83f567.Y74pa1cYlIOT_Vdp2xuWOqeasckh1tWtxT9Ouw5.LPOBOA\",\n" +
                "session_secret: \"\",\n" +
                "session_key: \"\",\n" +
                "scope: \"basic netdisk\"\n" +
                "}";

        JSONObject json=(JSONObject) JSONObject.toJSON(JSON.parse(jsonStr));
        System.out.println("access_token:"+json.getString("access_token"));

        //字符串转json对象数组
        String jsonArrayStr ="{  \n" +
                "   \"users\": [\n" +
                "        {\n" +
                "            \"id\": \"1\",\n" +
                "            \"name\": \"张三\",\n" +
                "        },\n" +
                "        {\n" +
                "            \"id\": \"2\",\n" +
                "            \"name\": \"李四\",\n" +
                "        } \n" +
                "    ]\n" +
                "}";
        JSONObject jsonTemp=(JSONObject) JSONObject.toJSON(JSON.parse(jsonArrayStr));
        JSONObject jsnobject = new JSONObject(jsonTemp);
        JSONArray jsonArray = jsnobject.getJSONArray("users");
        for (int i = 0; i < jsonArray.size(); i++) {
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            System.out.println(jsonObject.get("name"));
        }

    }

输出结果：