我正在尝试创建一个多人游戏,如果大厅未满,主机有人工智能飞船,它们将它们的 Action 发送到服务器,服务器将它们的“ Action ”广播到客户端游戏中的空白飞船。广播伴随着一个“i”,它是 AIShips 标识符,因此正确的船只被告知在客户端游戏中移动。
这是使用它的代码:
初始发出:(AIShip.java)
JSONObject data = new JSONObject();
try {
data.put("i", identifier); //Identifier is an int set once in the constructor
gameScreen.spaceSoccer.socket.emit("moveAIShipForward", data);
} catch (JSONException e){
e.printStackTrace();
}
我的服务器:(index.js)
socket.on("moveAIShipForward", function(i) {
socket.broadcast.emit("moveAIShipForward", {id: socket.id, i: i})
});
对广播的响应:(SpaceSoccer.java)
.on("moveAIShipForward", new Emitter.Listener() {
@Override
public void call(Object... args) {
JSONObject data = (JSONObject) args[0];
try {
int i = data.getInt("i"); //error
gameScreen.AIShip[i].moveBodyForward();
} catch (JSONException e) {
e.printStackTrace();
}
});
错误:W/System.err: org.json.JSONException: org.json.JSONObject 类型的 i 处的值 {"i":0} 无法转换为 int W/System.err:位于 org.json.JSON.typeMismatch(JSON.java:100)
最佳答案
这是因为您嵌套了 { "i":identifier }
对象。看一下(在下面的注释代码中进行了解释):
初始发出:(AIShip.java)
JSONObject data = new JSONObject();
...
data.put("i", identifier);
// here the `data` is like `{ "i": 0 }` and it's emmited
gameScreen.spaceSoccer.socket.emit("moveAIShipForward", data);
...
我的服务器:(index.js)
// here, the `i` is what you have sent earlier: `{ "i": 0 }`
socket.on("moveAIShipForward", function(i) {
// here, you are passing the `{ "i": 0 }` object to the new object, under `i` key, the resulting object looks like this:
// `{ id: 0, i: { i: 0 } }`
// and it's emitted
socket.broadcast.emit("moveAIShipForward", {id: socket.id, i: i})
});
对广播的响应:(SpaceSoccer.java)
.on("moveAIShipForward", new Emitter.Listener() {
...
JSONObject data = (JSONObject) args[0];
try {
// now here, the object looks like above (in the .js file), so `.get("i")` would return a `{ "i": 0 }` obejct, which obviously cannot be converted to int.
int i = data.getInt("i"); // { "i": 0 } is not an integer!
....
});
解决方案(不是唯一的解决方案,一旦您知道原因):
在您的 index.js
中,将您要发送的有效负载更改为如下所示,例如:
socket.on("moveAIShipForward", function(data) {
socket.broadcast.emit("moveAIShipForward", {id: socket.id, i: data.i})
});
关于java - (Node.js、socket.io)JSONObject 无法转换为 int,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58731708/