1.使用java语句连接服务器上的mongodb数据库,首先连接成功,几毫秒后因出现套接字异常被断开连接
这是日志显示的
这是 mongdb的日志
确实有连接进来的日志显示
import java.util.List;
import java.util.ArrayList;
import java.util.List;
import org.bson.types.ObjectId;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
public class csdnconnect {
static Mongo connection = null;
static DB db = null;
public void MongoDBUtil(String dbName) throws Exception
{
connection = new Mongo("47.114.149.208:27017");
db = connection.getDB(dbName);
}
public static Mongo getConnection() {
return connection;
}
public List<String> findd(String collName)
{
DBCollection collection = db.getCollection(collName);
DBCursor cursor =collection.find();
return convertCursorToList(cursor);
}
private List<String> convertCursorToList(DBCursor cursor)
{
List<String> results = new ArrayList<String>();
while(cursor.hasNext())
{
DBObject dbObject = cursor.next();
for(String key : dbObject.keySet())
{
results.add("{"+key+":"+dbObject.get(key)+"}");
}
}
return results;
}
}
这是 连接mongodb数据库的代码 包括连接和查询
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.view.View;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private SensorManager sm;
private Sensor mysensor;
private StringBuffer sb = new StringBuffer();
private csdnconnect db = new csdnconnect();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
System.out.println("wudi1");
sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
try {
db.MongoDBUtil("mycol");
System.out.println("wudi2");
db.getConnection();
List<String> cursor=db.findd("mycol");
System.out.println("wudi3");
System.out.println(cursor);
} catch (Exception e) {
e.printStackTrace();
}
}
}
这是安卓代码mainactivity部分,数据库相关的只有try catch里面的内容,其实“wudi3”和cursor并没有输出
希望有大佬能帮我看看问题出在哪里