使用gson的tojson和fromjson实现对象和json的转换
Gson gson = new Gson(); // Or use new GsonBuilder().create();
MyType target = new MyType();
String json = gson.toJson(target); // serializes target to Json
MyType target2 = gson.fromJson(json, MyType.class); // deserializes json into target2
Type listType = new TypeToken<List<String>>() {}.getType();
List<String> target = new LinkedList<String>();
target.add("blah");
Gson gson = new Gson();
String json = gson.toJson(target, listType);
List<String> target2 = gson.fromJson(json, listType);
使用GsonBuilder创建gson对象
Gson gson = new GsonBuilder()
.registerTypeAdapter(Id.class, new IdTypeAdapter())
.enableComplexMapKeySerialization()
.serializeNulls()
.setDateFormat(DateFormat.LONG)
.setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE)
.setPrettyPrinting()
.setVersion(1.0)
.create();
Gson gson = new GsonBuilder()
.register(Point.class, new MyPointTypeAdapter())
.enableComplexMapKeySerialization()
.create();
map对象转换成json对象
Gson gson = new GsonBuilder()
.register(Point.class, new MyPointTypeAdapter())
.enableComplexMapKeySerialization()
.create();
Map<Point, String> original = new LinkedHashMap<Point, String>();
original.put(new Point(5, 6), "a");
original.put(new Point(8, 8), "b");
System.out.println(gson.toJson(original, type));
The above code prints this JSON object:
{
"(5,6)": "a",
"(8,8)": "b"
}
map对象转化成jsonArray对象：
Gson gson = new GsonBuilder().enableComplexMapKeySerialization().create();Map<Point, String> original = new LinkedHashMap<Point, String>();original.put(new Point(5, 6), "a");original.put(new Point(8, 8), "b");System.out.println(gson.toJson(original, type));The JSON output would look as follows: [[{"x": 5,"y": 6},"a"],[{"x": 8,"y": 8},"b"]]
JsonParser
parse方法将json类型的字符串，或者reader对象或者JsonReader对象解析成为jsonElement对象
（转）)
