java json对象转换

引入的jar包:

commons-beanutils-1.9.2.jar

commons-collections-3.2.1.jar

commons-lang-2.6.jar

commons-logging-1.2.jar

ezmorph-1.0.6.jar

json-lib-2.4-jdk15.jar

字符串存json对象里:

String content = "123";

String content2 = "456";

JSONObject jsonObj = new JSONObject();

jsonObj.put("a",content);

jsonObj.put("b",content2);

System.out.println(jsonObj);//输出{"a":"123","b":"456"}

fwriter = new FileWriter(savefile);

fwriter.write(jsonObj.toString()); //把jsonObj转成string类型 存到文件中

fwriter.flush();

fwriter.close();

从json对象里获取字符串

while ((lineTxt = br.readLine()) != null) {

System.out.println(lineTxt); //从文件中读出的内容

JSONObject json = JSONObject.fromObject(lineTxt); //转jsonobject

System.out.println(json.get("I"));//获取I导连

JSONArray arr = (JSONArray) json.get("I");;//获取I导连 放到集合中

//List list = (List) json.get("I"); 同上

System.out.println(list.get(2) instanceof Integer); //true

}

原文地址:https://www.cnblogs.com/zhi-ming/p/10453158.html