Java Mina是一種輕量級(jí)的網(wǎng)絡(luò)應(yīng)用框架，它提供了一種高效、可擴(kuò)展的網(wǎng)絡(luò)通信方式。而JSON（JavaScript Object Notation）是一種輕量級(jí)的數(shù)據(jù)交換格式，以其易于讀寫(xiě)和解析的特點(diǎn)受到廣泛的應(yīng)用。在Java Mina中使用JSON進(jìn)行數(shù)據(jù)傳輸可以使通信更加高效、易于維護(hù)。

//引入Java Mina和JSON相關(guān)的包
import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.json.JSONObject;
//定義一個(gè)簡(jiǎn)單的數(shù)據(jù)傳輸類(lèi)
public class Data {
int id;
String name;
//將Data對(duì)象轉(zhuǎn)換為JSON
public JSONObject toJson() {
JSONObject obj = new JSONObject();
obj.put("id", this.id);
obj.put("name", this.name);
return obj;
}
//將JSON轉(zhuǎn)換為Data對(duì)象
public static Data fromJson(JSONObject obj) {
Data data = new Data();
data.id = obj.getInt("id");
data.name = obj.getString("name");
return data;
}
}
//在Mina客戶(hù)端中發(fā)送JSON數(shù)據(jù)
public class ClientHandler extends IoHandlerAdapter {
public void messageSent(IoSession session, Object message) throws Exception {
//將Data對(duì)象轉(zhuǎn)換為JSON字符串
Data data = new Data();
data.id = 1;
data.name = "Java Mina";
String jsonStr = data.toJson().toString();
//將JSON字符串轉(zhuǎn)換為IoBuffer
IoBuffer buffer = IoBuffer.allocate(jsonStr.length());
buffer.putString(jsonStr, Charset.forName("UTF-8"));
buffer.flip();
//發(fā)送IoBuffer
session.write(buffer);
}
}
//在Mina服務(wù)器端中接收J(rèn)SON數(shù)據(jù)
public class ServerHandler extends IoHandlerAdapter {
public void messageReceived(IoSession session, Object message) throws Exception {
//將IoBuffer轉(zhuǎn)換為JSON字符串
IoBuffer buffer = (IoBuffer) message;
String jsonStr = buffer.getString(Charset.forName("UTF-8").newDecoder());
//將JSON字符串轉(zhuǎn)換為Data對(duì)象
JSONObject obj = new JSONObject(jsonStr);
Data data = Data.fromJson(obj);
//處理Data對(duì)象
System.out.println("id=" + data.id + ", name=" + data.name);
}
}

以上代碼演示了在Java Mina中使用JSON進(jìn)行數(shù)據(jù)傳輸?shù)倪^(guò)程。客戶(hù)端將Data對(duì)象轉(zhuǎn)換為JSON字符串后發(fā)送給服務(wù)器，服務(wù)器接收到IoBuffer后將其轉(zhuǎn)換為JSON字符串，再將JSON字符串轉(zhuǎn)換為Data對(duì)象進(jìn)行處理。