Problems and solutions when using org json and fast json

1. Differences in values

When the obtained key does not exist:

org json will throw Exception

fast json will return null

Example:

com.alibaba.fastjson.JSONObject fastJson = new com.alibaba.fastjson.JSONObject( );

String name = fastJson.getString("name");

// fastJson normal output name:null

System.out.println("name:" + name);

org.json.JSONObject orgJson = new org.json.JSONObject();

//Throw exception: org.json.JSONException: JSONObject["name"] not found.

name = orgJson.getString("name");

System.out.println("name:" + name);

2. put org json in fast json

This operation is abnormal and empty json will be put

Example:

org.json.JSONObject orgJsonAddress = new org.json.JSONObject();

orgJsonAddress.put("country", " China");

orgJsonAddress.put("province", "Henan");

orgJsonAddress.put("city", "Zhengzhou");

com.alibaba.fastjson.JSONObject fastJson = new com.alibaba.fastjson.JSONObject();

fastJson.put("name", "Qingjiang Li");

fastJson.put("sex", 1);

fastJson.put("address", orgJsonAddress);

System.out.println(fastJson.toJSONString());

Exception output:

{

"address": {},

"sex": 1,

"name": "Qingjiang Li"

}

3. put fast json in org json

This operation is normal

Example:

com.alibaba.fastjson. JSONObject fastJsonAddress = new com.alibaba.fastjson.JSONObject();

fastJsonAddress.put("country", "China");

fastJsonAddress.put("province", "Henan" );

fastJsonAddress.put("city", "Zhengzhou");

org.json.JSONObject orgJson = new org.json.JSONObject();

orgJson.put("name", "Qingjiang Li");

orgJson.put("sex", 1);

orgJson.put("address", fastJsonAddress);

System.out.println(orgJson.toString());

Output is normal:

{

"address": {

"country": "China",

"province": "Henan",

"city": "Zhengzhou"

},

"sex": 1,

"name": "Qingjiang Li"

}

Conclusion:

In the project, try to use the same kind of JSON. If you have to use both, please be careful when using it and avoid Mistakes occur due to habits.

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