if(jsonObject.containsKey("name")){System.out.println("JSON对象包含key 'name'");}else{System.out.println("JSON对象不包含key 'name'");} 1. 2. 3. 4. 5. 在上面的代码中,我们使用containsKey()方法来判断JSON对象是否包含key “name”。如果包含
importorg.json.JSONObject;publicclassJsonKeyChecker{publicstaticvoidmain(String[]args){StringjsonString="{\"name\":\"Alice\", \"age\":30, \"isStudent\":false}";JSONObjectjsonObject=newJSONObject(jsonString);// 检查键是否存在if(jsonObject.has("name")){System.out.println("JSON contains k...
JSONObject.containsKey("key")
containsKey("origin")返回的是true,但是get("origin")是null的时候,json.toString()返回的toString是没有值为null的属性的,需要再加判断= =||| jsonObject.get("origin") != null
java jsonobject containskey 文心快码BaiduComate 在Java中,JSONObject.containsKey(String key)方法是一个非常实用的功能,它用于检查一个JSONObject对象中是否包含指定的键(key)。以下是对该方法的详细解释和示例: JSONObject.containsKey(String key)方法的作用: 这个方法用于检查一个JSONObject对象中是否包含指定的键(...
记录fastjson containsKey踩的坑 业务场景:API调用结果com.alibaba.fastjson.JSONObject,containsKey判断某key是否存在, 如存在进行相关业务1操作,否则进行相关业务2操作; 异常情况:当某key不存在时,进入了业务1操作,业务代码报了空指针异常; 排查历程: 1、一脸懵逼;...
+"','"+ (jsonAccno.containsKey("linkmobile")?jsonAccno.getString("linkmobile"):"") +"','"+ (jsonAccno.containsKey("username")?jsonAccno.getString("username"):"") +"','"+ (jsonAccno.containsKey("certsn")?jsonAccno.getString("certsn"):"") ...
containsKey("secondarySpeaker")) { String secondarySpeakerName = talkObject.getString("secondarySpeaker"); speakerList.add(getSpeakerOrCreateOneIfNull(code, title, secondarySpeakerName)); } if (talkObject.containsKey("otherSpeakers")) { JsonArray otherSpeakersArray = talkObject.getJsonArray("other...
publicStringsign(Algorithm algorithm)throws IllegalArgumentException,JWTCreationException{if(algorithm==null){thrownewIllegalArgumentException("The Algorithm cannot be null.");}else{this.headerClaims.put("alg",algorithm.getName());if(!this.headerClaims.containsKey("typ")){this.headerClaims.put("typ"...
containsKey("isbn"); } }; List<Map<String, Object>> books = reader.read("$.store.book[?].isbn", List.class, booksWithISBN); Path vs Value In the Goessner implementation a JsonPath can return either Path or Value. Value is the default and what all the examples above are returning. ...