大家好，我有一個簡單的問題，我似乎無法使用 jersey 中的 GSON 庫將 zookeeper 對象轉換為 json ，反之亦然。我得到的錯誤是Exception in thread "main" java.lang.StackOverflowError at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:381) at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:376) at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:381) at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:376)它一直在持續很大。從我搜索的內容來看，這似乎是嵌套太深的對象和遞歸的問題。這是我嘗試的簡單 POCZooKeeper zoo; try { zoo = new ZooKeeper("localhost:2182",5000,null); String obj=gson.toJson(zoo, ZooKeeper.class); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); }有人可以清楚地解釋什么是實際問題，即使可以將 zookeeper 對象轉換為 json 并將其使用（因為與之關聯的所有線程）
1 回答
Helenr
TA貢獻1780條經驗 獲得超4個贊
ZooKeeper 是服務器而不是 DTO
也許你想用 DTO 配置做一個 json
我的提議
public static void main(String[] args) {
ZooKeeper zoo;
try {
ZooKeeperConfDTO conf = new ZooKeeperConfDTO("localhost:2182", 5000, null);
zoo = runZoo(conf);
String json = new Gson().toJson(conf);
System.out.println(json); //---->{"connectString":"localhost:2182","sessionTimeout":5000}
} catch (Exception e) {
e.printStackTrace();
}
}
private static ZooKeeper runZoo(ZooKeeperConfDTO conf) throws IOException {
return new ZooKeeper(conf.connectString, conf.sessionTimeout, conf.watcher);
}
并創建了班級
import org.apache.zookeeper.Watcher;
public class ZooKeeperConfDTO {
public String connectString;
public int sessionTimeout;
public Watcher watcher;
public ZooKeeperConfDTO(String connectString, int sessionTimeout, Watcher watcher) {
this.connectString = connectString;
this.sessionTimeout = sessionTimeout;
this.watcher = watcher;
}
}
版本 2：
為 ClientCnxn 創建你的 TypeAdapter
import java.io.IOException;
import org.apache.zookeeper.ClientCnxn;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
public class ClientCnxnAdapter extends TypeAdapter<ClientCnxn> {
@Override
public void write(JsonWriter writer, ClientCnxn cnxn) throws IOException {
writer.beginObject();
writer.name("sessionId");
writer.value(cnxn.getSessionId());
writer.name("timeOut");
writer.value(cnxn.getSessionTimeout());
writer.endObject();
}
@Override
public ClientCnxn read(JsonReader in) throws IOException {
return null;
}
}
并使用它
public static void main(String[] args) {
ZooKeeper zoo;
try {
zoo = new ZooKeeper("localhost:2182", 5000, null);
Gson gson = new GsonBuilder().registerTypeAdapter(ClientCnxn.class, new ClientCnxnAdapter()).create() ;
String json = gson.toJson(zoo);
System.out.println(json); //---->{"cnxn":{"sessionId":0,"timeOut":0},"watchManager":{"dataWatches":{},"existWatches":{},"childWatches":{}}}
} catch (Exception e) {
e.printStackTrace();
}
}
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