fastjson 是一个性能很好的 Java 语言实现的 JSON 解析器和生成器,来自阿里巴巴的工程师开发。
主要特点:
快速FAST (比其它任何基于Java的解析器和生成器更快,包括jackson)
强大(支持普通JDK类包括任意Java Bean Class、Collection、Map、Date或enum)
零依赖(没有依赖其它任何类库除了JDK)
public class FastJsonMain { static String json = "{\"study\": 10,\"study_course_count\": 10, \"recieved_reg_form_count\": 0,\"unread_count\": 5,\"teach_course_count\": 8,\"avatar\": \"1316634098115-02-57\",\"user_id\": 201,\"nickname\": \"Asus人名\"}"; static String arrayAyy="[[14,\"小学语文\"],[154,\"美食\"],[72,\"高中物理\"],null,[50,\"高中化学\"],[15,\"小学数学\"],[13\"英语\"],null,[1,\"其他英语培训\"],null]"; /** * Json 转换 实体类 提示:FastJson在映射实体上非常棒, json有的K,实体没有,依然不影响解析.. */ private void Json2Eetity() { // TODO Auto-generated method stub Welcome welcome = JSON.parseObject(json, Welcome.class); System.out.println(welcome.toString()); System.out.println(welcome.getNickname()); } /** * 实体类 转换 Json */ private void Eetity2Json() { // TODO Auto-generated method stub Welcome welcome = new Welcome(2, 3, 4, 5, "imagUrl", 11, "Mers"); String json = JSON.toJSONString(welcome, true); System.out.println("实体转换Json:" + json); } /** * list集合转json格式字符串 */ public void list2Json() { List<Welcome> list = new ArrayList<Welcome>(); Welcome welcome1 = new Welcome(2, 3, 4, 5, "imagUrl", 11, "Mers"); Welcome welcome2 = new Welcome(22, 33, 44, 55, "imag", 65, "Kers"); Welcome welcome3 = new Welcome(64, 33, 34, 05, "imagUrl", 43, "Wers"); Welcome welcome4 = new Welcome(62, 75, 41, 25, "imagUrl", 109, "Oers"); list.add(welcome1); list.add(welcome2); list.add(welcome3); list.add(welcome4); String json = JSON.toJSONString(list, true); System.out.println("ist集合转json格式字符串 :" + json); } /** * String转换 JSONArray * 并且去除null */ private void String2JSONArray() { // TODO Auto-generated method stub JSONArray array=JSONArray.parseArray(arrayAyy); System.out.println(array); System.out.println("长度: "+array.size()); Collection nuCon = new Vector(); nuCon.add(null); array.removeAll(nuCon); System.out.println(array); System.out.println("长度: "+array.size()); } public static void main(String[] args) { FastJsonMain main = new FastJsonMain(); main.Json2Eetity(); System.out.println(" "); main.Eetity2Json(); System.out.println(""); main.list2Json(); System.out.println(" "); main.String2JSONArray(); } }