字符串转为jsonobject(string字符串转json)

JSONObject与json字符串彼此转化

wangxl@20180718

所需jar包

commons-beanutils-1.8.0.jar不加这个包

java.lang.NoClassDefFoundError:org/apache/commons/beanutils/DynaBean

2、commons-collections-3.1.jar不加这个包

java.lang.NoClassDefFoundError:org/apache/commons/collections/map/ListOrderedMap

3、commons-lang-2.5.jar不加这个包

java.lang.NoClassDefFoundError:org/apache/commons/lang/exception/NestableRuntimeException

4、commons-logging-1.2.jar不加这个包

java.lang.NoClassDefFoundError:org/apache/commons/logging/LogFactory

5、ezmorph-1.0.6.jar不加这个包

java.lang.NoClassDefFoundError:net/sf/ezmorph/Morpher

6、json-lib-2.4-jdk15.jar不加这个包

java.lang.NoClassDefFoundError:net/sf/json/JSONObject

参阅下载网址：https://download.csdn.net/download/flyme2010/10548102

函数参阅

//json字符串转成JSONObject

publicvoidJsonStr2JSONObject()

{undefined

Stringjsonstr=”{\”msgType\”:\”1\”,\”hasMore\”:\”0\”,\”data\”:[{\”serviceId\”:\”StreetLight\”,\”serviceData\”:{\”length\”:12,\”value\”:\”123456789012\”}}]}”;

JSONObjectjsonObject=JSONObject.fromObject(jsonstr);

StringmsgType=jsonObject.getString(“msgType”);

System.out.println(“msgType=”+msgType);//输出：msgType=1

JSONArraydata=jsonObject.getJSONArray(“data”);

Stringss=data.getString(0);

JSONObjectdata2=JSONObject.fromObject(ss);

StringserviceId=data2.getString(“serviceId”);

System.out.println(“serviceId=”+serviceId);//输出：serviceId=StreetLight

StringserviceData=data2.getString(“serviceData”);

JSONObjectdata3=JSONObject.fromObject(serviceData);

Stringvalue=data3.getString(“value”);

System.out.println(“value=”+value);//输出：value=123456789012

}

//JSONObject生成json字符串

publicvoidJSONObject2JsonStr()

{undefined

JSONObjectjsonObject=newJSONObject();

MapparamData=newHashMap<>();

MapserviceData=newHashMap<>();

serviceData.put(“length”,newInteger(12));

serviceData.put(“value”,”123456789012″);

paramData.put(“serviceId”,”StreetLight”);

paramData.put(“serviceData”,serviceData);

List>cmds=newArrayList>();//数组

cmds.add(paramData);

jsonObject.put(“msgType”,”1″);

jsonObject.put(“hasMore”,newInteger(0));

jsonObject.put(“data”,cmds);

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

//打印输出：{“msgType”:”1″,”hasMore”:0,”data”:[{“serviceData”:{“length”:12,”value”:”123456789012″},”serviceId”:”StreetLight”}]}

}
,string字符串转json,以下均利用Gson来处理：

1.将bean转换成Json字符串：

publicstaticStringbeanToJSONString(Objectbean){

returnnewGson().toJson(bean);

}

2.将Json字符串转换成对象：

publicstaticObjectJSONToObject(Stringjson,ClassbeanClass){

Gsongson=newGson();

Objectres=gson.fromJson(json,beanClass);

returnres;

}

注：转换后的对象使用前进行强转：例如beanbean1=(bean)FormatUtil.JSONToObject(json,bean.class);

3.将Json字符串转换成JsonObject对象：

1

JsonObjectreturnData=newJsonParser().parse(jsonstr).getAsJsonObject();

4.将JsonArray类型的Json字符串解析成对象方法：

Gsongson=newGson();

JsonParserparser=newJsonParser();

JsonArrayJarray=parser.parse(jstring).getAsJsonArray();

ArrayList<channelSearchEnum>lcs=newArrayList<channelSearchEnum>();

for(JsonElementobj:Jarray){

channelSearchEnumcse=gson.fromJson(obj,channelSearchEnum.class);

lcs.add(cse);

}

或者

Stringjson=”[{\”username\”:\”test\”},{\”username\”:\”test2\”}]”;

System.out.println(newJsonParser().parse(json).getAsJsonArray().get(0).getAsJsonObject().get(“username”).getAsString());

5.获取JsonObject中指定key值对应的JsonArray对象：

Stringjson=”{\”pids\”:[\”1\”,\”2\”,\”3\”]}”;

System.out.println(newJsonParser().parse(json).getAsJsonObject().getAsJsonArray(“pids”).get(0).getAsString());