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How to use fastjson

2025-01-16 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Internet Technology >

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This article introduces the knowledge of "how to use fastjson". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

JSONObject's method

Package name: com.alibaba.fastjson maven dependency:

The use of com.alibaba fastjson 1.2.7JSONObject converts strings to JSONObject objects String str = "{\" desc\ ":\" string in json format\ ",\" sex\ ":\" male\ "}"; JSONObject jo = JSONObject.parseObject (str)

JSONObject can convert extremely complex json objects, as can the following json statement, and obtain the corresponding values through the corresponding methods.

{"protocol": {"itemID": "9527", "companyID": "4399", "userID": "233"}," operateInfo ": {" cooptaskSceneDataPackets ": [{" taskID ":" 123", "runSceneID": "345"," dataTagCode ":" objection " "dataTagID": "", "dataTagName": "Yes", "dataTagBelongOrg": "}, {" taskID ":" 126 "," runSceneID ":" 345 "," dataTagCode ":"," dataTagID ":" "dataTagName": "Yes", "dataTagBelongOrg": ""}, {"taskID": "123"," runSceneID ":" 345", "dataTagCode": "unable", "dataTagID": "15th", "dataTagName": "Yes" "dataTagBelongOrg": "572"}, {"taskID": "124", "runSceneID": "235", "dataTagCode": "", "dataTagID": "", "dataTagName": "" "dataTagBelongOrg": ""}]} convert String objects to entity classes

Use JSONObject.parseObject (String text, Class clazz)

String str = "{\" itemID\ ":\" 9527\ ",\" companyID\ ":\" 4399\ ",\" userID\ ":\" 4399\ "}"; EntityProtocol entityProtocol = JSONObject.parseObject (str, EntityProtocol.class)

If the type does not match, the entity class with all attributes null is created.

Add or modify properties to the JSONObject object

Use the .put (key,value) method

If the key parameter is not in the original object, the key property is added and assigned to value in the original object.

If the key parameter exists, change the value of key to value

/ / JSONObject.put (String key,Object value); jo.put ("key", "value"); jo.put ("sex", "modify"); JSONObject.putAll (Map

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