JSONObject获取值后为一个对象，将对象转为JSONObject时报错

将json字符串转化成JavaBean对象

Person person = new Person("1","gson",1);

Gson gson = new Gson();

//这里将javabean转化成json字符串

String jsonString = gsontoJson(person);

Systemoutprintln(jsonString);

//这里将json字符串转化成javabean对象,

person = gsonfromJson(jsonString,Personclass);

将json字符串转化成List<JavaBean>对象

Person person1 = new Person("1","gson1",1);

Person person2 = new Person("2","gson2",2);

List<Person> persons = new ArrayList<Person>();

personsadd(person1);

personsadd(person2);

Gson gson = new Gson();

//这里将lsit<javabean>转化成json字符串

String jsonString = gsontoJson(persons);

//解析json字符串

List<Person> persons2 = gsonfromJson(jsonString, new TypeToken<List<Person>>(){}getType());

将json字符串转化成List<String>对象

List<String> list = new ArrayList<String>();

listadd("gson1");

listadd("gson2");

listadd("gson3");

Gson gson = new Gson();

String jsonString = gsontoJson(list);

Systemoutprintln("json字符串:"+jsonString);

//解析json字符串

List<String> list2 = gsonfromJson(jsonString, new TypeToken<List<String>>(){}getType());

将json字符串转化成List<Map<String,Object>>对象

Map<String,Object> map = new HashMap<String,Object>();

mapput("key1", "value1");

mapput("key2", "value2");

Map<String,Object> map2 = new HashMap<String,Object>();

map2put("key1", 1);

map2put("key2", 2);

List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();

listadd(map);

listadd(map2);

Gson gson =  new Gson();

String jsonString = gsontoJson(list);

Systemoutprintln("json字符串:"+jsonString);

//解析json字符串

List<Map<String,Object>> list2 = gsonfromJson(jsonString, new TypeToken<List<Map<String,Object>>>(){}getType());

我们需要先把json字符串转化为netsfjsonJSONObject对象，java中这样就可以完成json字符串到Map的转换了。

1将数组转换为JSON：String[] arr = {"asd","dfgd","asd","234"};JSONArray jsonarray = JSONArrayfromObject(arr);Systemoutprintln(jsonarray);

2对象转换成JSON：UserInfo user = new UserInfo(1001,"张三");JSONArray jsonArray = JSONArrayfromObject(user);Systemoutprintln( jsonArray );

3把Map转换成json， 要使用jsonObject对象：Map<String, Object> map = new HashMap<String, Object>();mapput("userId", 1001);mapput("userName", "张三");mapput("userSex", "男");JSONObject jsonObject = JSONObjectfromObject(map);Systemoutprintln(jsonObject);

4把List转换成JSON数据：List<UserInfo> list = new ArrayList<UserInfo>();UserInfo user = new UserInfo(1001, "张三");listadd(user);listadd(user);listadd(user);JSONArray jsonArray = JSONArrayfromObject(list);Systemoutprintln(jsonArray);

5

那要看你的json数据是什么要的格式，比如javabean实体中包含实体的转换

JSONObject jsonObject = JSONObjectfromObject("你的json数据");

Map<String, Object> classMap = new HashMap<String, Object>();

/如：{"validateMessagesShowId":"_validatorMessage","status":true,">

我们需要先把json字符串转化为netsfjsonJSONObject对象，java中这样就可以完成json字符串到Map的转换了。

1将数组转换为JSON：String[] arr = {"asd","dfgd","asd","234"};JSONArray jsonarray = JSONArrayfromObject(arr);Systemoutprintln(jsonarray);

2对象转换成JSON：UserInfo user = new UserInfo(1001,"张三");JSONArray jsonArray = JSONArrayfromObject(user);Systemoutprintln( jsonArray );

3把Map转换成json， 要使用jsonObject对象：Map<String, Object> map = new HashMap<String, Object>();mapput("userId", 1001);mapput("userName", "张三");mapput("userSex", "男");JSONObject jsonObject = JSONObjectfromObject(map);Systemoutprintln(jsonObject);

4把List转换成JSON数据：List<UserInfo> list = new ArrayList<UserInfo>();UserInfo user = new UserInfo(1001, "张三");listadd(user);listadd(user);listadd(user);JSONArray jsonArray = JSONArrayfromObject(list);Systemoutprintln(jsonArray);

5

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