How to Use Json to communicate with Java and C #

Communication between modules is often involved in projects, which inevitably involves communication between different languages, for example, in the previous project, the Java message needs to be received by C # (how to transmit the specific message can use RabbitMQ, etc, for more information about the use of RabbitMQ, see my previous blog. These are all object-oriented languages. It is difficult to resolve object-oriented messages to C. The following is a summary of the specific methods for Java and C # to communicate with each other using the Json password. Abstract: Json is a powerful tool for communication between Java and C #. the Java end converts a Java object to a Json string and then sends it. The C # End receives the Json string and converts it to a C # object; C # parses the Json string into a Java object after receiving the string. The Json string serves as a bridge between different languages. It is convenient to generate a Json string for the defined Java or C # object and generate a Java or C # object from the Json string. That is, jackson is used in Java, C # Use Newtonsoft. json, there are still some issues to be aware of, such as time-based conversion of common types, the following is my summary of this. Key words: Json, Java, C #, jackson, Newtonsoft prerequisites: a program written by Java, a program written by C. Requirement: Some information needs to be exchanged between Java programs and C # programs. The information is originally encapsulated in the form of objects. (Use jackson-all-1.9.0.jar and Newtonsoft. Json. dll. 1. Java below is a simple Java class example. It contains three attributes and provides two methods for mutual conversion between objects and Json strings. PublicclassNotifyRealTimeMessage implementsSerializable {private static ObjectMapper mapper = new ObjectMapper (); static {SimpleDateFormat dateFormat = new SimpleDateFormat ("yyyy-MM-dd HH: mm: ss"); mapper. setDateFormat (dateFormat) ;}@ JsonProperty ("messageType") private int type; @ JsonProperty ("geoData") private Object message; @ JsonProperty ("time") private Calendar time; public int getType (){ Return type;} public void setType (int type) {this. type = type;} public Object getMessage () {return message;} public void setMessage (Object message) {this. message = message;} public Calendar getTime () {return time;} public void setTime (Calendar time) {this. time = time;}/*** produce Json String **/public String toJson () throws JsonGenerationException, JsonMappingException, IOException {return ma Pper. writeValueAsString (this);}/*** construct the policyrealtimemessage object from the Json String **/public static policyrealtimemessage fromJson (String json) throws JsonParseException, JsonMappingException, IOException {if (json = null) {return null;} else {return mapper. readValue (json, policyrealtimemessage. class) ;}} the toJson method converts the policyrealtimemessage object to a Json string. The fromJson static method converts a Json string into a policyrealtimemessage object. Because the NotifyRealTimeMessage object contains a time-type Calendar field, you must first set the agreed time format for mapper, mapper. SetDateFormat. Use it like this: yyrealtimemessage policymessage = yyrealtimemessage. fromJson (json); String json = policymessage. toJson ();. II. C # The following is the C # class corresponding to the Java class. It also contains three attributes, but does not provide a method for converting Json strings, note that the name of the JsonProperty tag is the same as that of the Java class. Public class RealTimeDataMsg {[JsonProperty ("messageType")] public int MessageType {get; set;} [JsonProperty ("geoData")] public GeoData Data {get; set ;} [JsonProperty ("time")] public DateTime Time {get; set ;}} is a common tool class for converting C # objects and Json strings, it is implemented using generics. It provides two methods for mutual conversion between objects and Json strings. Public static class JsonHelper {private static readonly JsonSerializerSettings MyJsonSerializerSettings; static JsonHelper () {response = new JsonSerializerSettings (); IsoDateTimeConverter dateTimeConverter = new IsoDateTimeConverter (); dateTimeConverter. dateTimeFormat = "yyyy-MM-dd HH: mm: ss"; MyJsonSerializerSettings. converters. add (dateTimeConverter);} public static T FromJson <T> (String json) {if (string. isNullOrEmpty (json) {return default (T);} return JsonConvert. deserializeObject <T> (json, MyJsonSerializerSettings);} public static string ToJson <T> (T data) {return JsonConvert. serializeObject (data, MyJsonSerializerSettings) ;}} in C #, it is also very convenient to use, RealTimeDataMsg realMsg = JsonHelper. fromJson <RealTimeDataMsg> (json); string json = JsonHelper. toJson (realMsg );. Here, you also need to set the agreed time format for MyJsonSerializerSettings: yyyy-MM-dd HH: mm: ss to parse the Json string generated by Java correctly.