Conversion between JSON and JAVA data

Import net. sf. json. JSONArray;
Import net. sf. json. JSONException;
Import net. sf. json. JSONObject;
Import net. sf. json. JSONSerializer;


/**
* Converting a json object to a java object
*
* @ Throws JSONException
*/
@ Test
Public void jsonToJava (){
String json = "[{\" addTime \ ": \" 14:23:02 \ ", \" iccid \ ": \" 1111 \ ", \" id \ ": 0, \ "imei \": \ "2222 \", \ "imsi \": \ "3333 \", \ "phoneType \": \ "4444 \", \ "remark \": \ "aaaa \", \ "tel \" :\" 5555 \ "}]";
// Receives the {} object. An exception occurs when receiving the array object.
If (json. indexOf ("[")! =-1 ){
Json = json. replace ("[","");
}
If (json. indexOf ("]")! =-1 ){
Json = json. replace ("]", "");
}
JSONObject obj = new JSONObject (). fromObject (json );
SimInfo simInfo = (SimInfo) JSONObject. toBean (obj, SimInfo. class );
System. out. println ("obj:" + simInfo );
System. out. println (simInfo. getAddTime ());
System. out. println (simInfo. getIccid ());
System. out. println (simInfo. getImei ());
System. out. println (simInfo. getImsi ());
System. out. println (simInfo. getPhoneType ());
System. out. println (simInfo. getRemark ());
System. out. println (simInfo. getTel ());
System. out. println (simInfo. getId ());

DaoFactory. getSimInfoDao (). add (simInfo );
}

/**
* Convert json to a java Collection object
*/
@ Test
Public void jsonToJavas (){
String jsons = "[{\" addTime \ ": \" 14:23:02 \ ", \" iccid \ ": \" 1111 \ ", \" id \ ": 0, \ "imei \": \ "2222 \", \ "imsi \": \ "3333 \", \ "phoneType \": \ "4444 \", \ "remark \": \ "aaaa \", \ "tel \": \ "5555 \"}, "+
"{\" AddTime \ ": \" 2011-11-11 14:23:02 \ ", \" iccid \ ": \" 2222 \ ", \" id \ ": 0, \ "imei \": \ "2222 \", \ "imsi \": \ "3333 \", \ "phoneType \": \ "4444 \", \ "remark \": \ "aaaa \", \ "tel \" :\" 5555 \ "}]";
List <SimInfo> simInfos = getJavaCollection (new SimInfo (), jsons );
System. out. println (simInfos. size ());
For (SimInfo simInfo: simInfos ){
System. out. println ("addTime:" + simInfo. getAddTime ());
System. out. println ("========= ");
}

}

/**
* Encapsulate and convert a json object to a java Collection object
*
* @ Param <T>
* @ Param clazz
* @ Param jsons
* @ Return
*/
Private <T> List <T> getJavaCollection (T clazz, String jsons ){
List <T> objs = null;
JSONArray jsonArray = (JSONArray) JSONSerializer. toJSON (jsons );
If (jsonArray! = Null ){
Objs = new ArrayList <T> ();
List list = (List) JSONSerializer. toJava (jsonArray );
For (Object o: list ){
JSONObject jsonObject = JSONObject. fromObject (o );
T obj = (T) JSONObject. toBean (jsonObject, clazz. getClass ());
Objs. add (obj );
}
}
Return objs;
}

/**
* Converting a java object to a json object
*
* @ Throws JSONException
*/
@ Test
Public void javaToJson (){
SimInfo simInfo = new SimInfo ();
SimInfo. setAddTime (UtilTool. dateToStr (new Date (), null ));
SimInfo. setIccid ("1111 ");
SimInfo. setImei ("2222 ");
SimInfo. setImsi ("3333 ");
SimInfo. setPhoneType (4 );
SimInfo. setRemark ("aaaa ");
SimInfo. setTel ("5555 ");
// Convert a java object to a json object
String json = new JSONArray (). fromObject (simInfo). toString ();
// Json: [{"addTime": "14:23:02", "iccid": "1111", "id": 0, "imei": "2222 ", "imsi": "3333", "phoneType": "4444", "remark": "aaaa", "tel": "5555"}]
System. out. println ("json:" + json );
}

Jackson-core-asl-1.7.2.jar

Jackson-mapper-asl-1.7.2.jar

// Convert a Java object to JSON
StringWriter writer = new StringWriter ();
ObjectMapper mapper = new ObjectMapper ();
Mapper. writeValue (writer, simInfo );
String json = writer. toString ();

Json instance program based on json-lib.jar package
1. JSONObject to DynaBean
String json = "{name = \" json \ ", bool: true, int: 1, double: 2.2 }";
JSONObject jsonObject = JSONObject. fromObject (json );
// Abstract statement: DynaBean bean = (DynaBean) JSONSerializer. toJava (jsonObject );
Object bean = JSONObject. toBean (jsonObject );
// Object bean1 = JSONSerializer. toJava (jsonObject );
AssertEquals (jsonObject. get ("name"), PropertyUtils. getProperty (bean, "name "));
AssertEquals (jsonObject. get ("bool"), PropertyUtils. getProperty (bean, "bool "));
AssertEquals (jsonObject. get ("int"), PropertyUtils. getProperty (bean, "int "));
AssertEquals (jsonObject. get ("double"), PropertyUtils. getProperty (bean, "double "));

2. JSONObject to JavaBean
String json = "{name: \" zhangsan \ ", age: 25, hight: 1.72, sex: true }";
JSONObject jsonObject = JSONObject. fromObject (json );
UserBean bean = (UserBean) JSONObject. toBean (jsonObject, UserBean. class );
System. out. println (jsonObject );
Theoretically, this is fine, but there is an exception Caused by: java. lang. NoSuchMethodException: com. json. Json $ UserBean. <init> ()

             
3.JSONArray to List
String json = "[\"first\",\"second\"]";
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(json);
List output = (List) JSONSerializer.toJava(jsonArray);

4.JSONArray to array
String json = "[\"first\",\"second\"]";
JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(json);
JsonConfig jsonConfig = new JsonConfig();
jsonConfig.setArrayMode(JsonConfig.MODE_OBJECT_ARRAY);
Object[] output = (Object[]) JSONSerializer.toJava(jsonArray, jsonConfig);
Object[] expected = new Object[] { "first", "second" };
ArrayAssertions.assertEquals(expected, output);

5. The JSON string is specially designed for JavaBean (the jar package required for demonstration by Liu huibin demo is included in the attachment)

String str = "[{\" id \ ": \" 328 \ ", \" mestype \ ": \" inbox \ "},{ \" id \": \ "327 \", \ "mestype \": \ "inbox \" },{ \ "id \": \ "279 \", \ "mestype \": \ "already \" },{ \ "id \": \ "278 \", \ "mestype \": \ "already \" },{ \ "id \": \ "277 \", \ "mestype \": \ "already \" },{ \ "id \": \ "310 \", \ "mestype \": \ "inbox \" },{ \ "id \": \ "308 \", \ "mestype \": \ "inbox \" },{ \ "id \": \ "305 \", \ "mestype \": \ "inbox \" },{ \ "id \": \ "304 \", \ "mestype \": \ "inbox \" },{ \ "id \": \ "303 \", \ "mestype \": \ "inbox \"}] ";
JSONArray jsonArray = (JSONArray) JSONSerializer. toJSON (str );
List list = (List) JSONSerializer. toJava (jsonArray );
For (Object obj: list ){
JSONObject jsonObject = JSONObject. fromObject (obj );
MessageBean bean = (MessageBean) JSONObject. toBean (jsonObject, MessageBean. class );
String id = bean. getId () + "";
String type = bean. getMestype ();
System. out. println (id + "" + type );
}
System. out. println (list. size ());