FastJson的常用操作

package Demo.Sample1;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONPath;import com.alibaba.fastjson.parser.Feature;import com.alibaba.fastjson.serializer.SerializerFeature;public class Sample {    public static void main(String[] args) {                Group group = GenerateGroup();        String ss="{\"id\":1.1,\"name\":\"admin\",\"users\":[{\"id\":2.2,\"name\":\"guest\"},{\"id\":3.3,\"name\":\"root\"}]}";                Group groupWithNull=GenerateGroupWithNull();                BasicObjectToStringCompare();        JsonObjectToStringCompare(ss);        NJsonObjectToStringCompare(group);        JsonStringSequence(group, ss);                JsonEval(ss,"$.users");        DealWithNullToStringString(groupWithNull);            }        public static void BasicObjectToStringCompare()    {        System.out.println("---------- 基元类型 toString() toJSONString() 比较: ----------");        System.out.println("ZifuChuan");        System.out.println(JSON.toJSONString("ZifuChuan"));        System.out.println(true);        System.out.println(JSON.toJSONString(true));        System.out.println(1.1);        System.out.println(JSON.toJSONString(1.1));    }        public static String NJsonObjectToStringCompare(Group group) {        String jsonString = JSON.toJSONString(group);        System.out.println("---------- 非JsonObject toString() toJSONString() 比较: ----------");        System.out.println(group.toString());        System.out.println(JSON.toJSONString(group));        return jsonString;    }        public static String JsonObjectToStringCompare(String ss) {        Object o=JSON.parse(ss,Feature.OrderedField);        System.out.println("---------- JsonObject toString() toJSONString() 比较: ----------");        System.out.println(o.toString());        System.out.println(JSON.toJSONString(o));        return ss;    }        public static void JsonStringSequence(Group group, String jsonString) {        System.out.println("---------- 是否有序: ----------");        Object o=JSON.parse(jsonString);        System.out.println(o.toString());;                Object o1=JSON.parse(jsonString,Feature.OrderedField);        System.out.println(o1.toString());                Object o2 = JSON.toJSON(group);        System.out.println(o2.toString());    }        public static void JsonEval(String ss,String jsonPath) {        System.out.println("---------- Json Eval: ----------");                Object o3=JSONPath.eval(JSON.parse(ss,Feature.OrderedField),jsonPath);        System.out.println(o3.toString());    }    public static void DealWithNullToStringString(Group groupWithNull) {        System.out.println("---------- JsonObject with null emlement: ----------");        System.out.println(JSON.toJSONString(groupWithNull));        System.out.println(JSON.toJSONString(groupWithNull,SerializerFeature.WriteMapNullValue));    }        private static Group GenerateGroup() {        Group group = new Group();        group.setId(1.1);        group.setName("admin");        User guestUser = new User();        guestUser.setId(2.2);        guestUser.setName("guest");        User rootUser = new User();        rootUser.setId(3.3);        rootUser.setName("root");        group.addUser(guestUser);        group.addUser(rootUser);        return group;    }        private static Group GenerateGroupWithNull() {        Group group = new Group();        group.setId(1.1);        group.setName("");        User guestUser1 = new User();        guestUser1.setId(null);        guestUser1.setName("guest");        User guestUser2 = new User();        guestUser2.setId(3.3);                User guestUser3 = new User();                group.addUser(guestUser1);        group.addUser(guestUser2);        group.addUser(guestUser3);        return group;    }}

---------- 基元类型 toString() toJSONString() 比较: ----------ZifuChuan"ZifuChuan"truetrue1.11.1---------- JsonObject toString() toJSONString() 比较: ----------{"id":1.1,"name":"admin","users":[{"id":2.2,"name":"guest"},{"id":3.3,"name":"root"}]}{"id":1.1,"name":"admin","users":[{"id":2.2,"name":"guest"},{"id":3.3,"name":"root"}]}---------- 非JsonObject toString() toJSONString() 比较: ----------Demo.Sample1.Group@23ab930d{"id":1.1,"name":"admin","users":[{"id":2.2,"name":"guest"},{"id":3.3,"name":"root"}]}---------- 是否有序: ----------{"name":"admin","id":1.1,"users":[{"name":"guest","id":2.2},{"name":"root","id":3.3}]}{"id":1.1,"name":"admin","users":[{"id":2.2,"name":"guest"},{"id":3.3,"name":"root"}]}{"name":"admin","id":1.1,"users":[{"name":"guest","id":2.2},{"name":"root","id":3.3}]}---------- Json Eval: ----------[{"id":2.2,"name":"guest"},{"id":3.3,"name":"root"}]---------- JsonObject with null emlement: ----------{"id":1.1,"name":"","users":[{"name":"guest"},{"id":3.3},{}]}{"id":1.1,"name":"","users":[{"id":null,"name":"guest"},{"id":3.3,"name":null},{"id":null,"name":null}]}