string 转JSONObject

/*"{
      "code": 801,
      "message": "没有返回结果",
      "result": {
                 "code": 802,
                 "message": "红包生效时间不能小于当前时间，失败",
                 "result": {}
                }
    }}*/

import net.sf.json.JSONArray;  //用于集合或数组
import net.sf.json.JSONObject; //用于对象，

string 转object 
JSONObject json_test = JSONObject.fromObject(result);
String message=json_test.get("message").toString();

<dependency>
    <groupId>net.sf.json-lib</groupId>
    <artifactId>json-lib</artifactId>
    <version>2.4</version>
    <classifier>jdk15</classifier>
</dependency>
<!--json包-->
<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20150729</version>
</dependency>