JsonPath 的使用

场景：　之前处理json 对象，常常一层层去判断　，获取值，

　　　　往往涉及到多测判断，特别对于一些比较升的对象，此处推见使用jsonPath

依赖:

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
   </dependency>
<fastjson.version>1.2.24</fastjson.version>

Test:

    @Test
    public  void jsonPath() throws  Exception{
//        {
//             "username": "zhangsan",
//              "性别": "男",
//              "company": {
//                "companyName": "中华",
//                "address": "北京"
//              },
//              "cars": [
//                "奔驰",
//                "宝马"
//              ]
//        }
        String json = "{"username":"zhangsan","性别":"男","company":{"companyName":"中华","address":"北京"},"cars":["奔驰","宝马"]}";
        JSONObject jsonObject = JSONObject.parseObject(json);
        //判断 Json中company.companyName　的值是否包含＂中华＂
        boolean  isContaincompanyName = JSONPath.containsValue(jsonObject,"$.company.companyName","中华");
        System.err.println(isContaincompanyName);
        //获取json中的companyName　的值
        Object eval = JSONPath.eval(jsonObject, "$.company.companyName");
        System.err.println(eval);
        /**
         * 如果该字段没有，　返回null值
         */
        Object eval1 = JSONPath.eval(jsonObject, "$.company.companyName1");
        System.err.println(eval1);
    }