可序列化類錯誤

Question

我有一個java服務器，通過套接字將一些數據發送到android中開發的客戶端。 發送的數據是序列化......在試圖從ObjectInputStream中我碰到下面的錯誤，閱讀時客戶端：

java.lang.ClassNotFoundException: servers.Coordinate  
at java.lang.Class.classForName(Native Method) 
at java.lang.Class.forName(Class.java:237) 
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:2604) 
at java.io.ObjectInputStream.readNewClassDesc(ObjectInputStream.java:1860) 
java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:840) 
at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:2080) 
java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:943) 
java.io.ObjectInputStream.readObject(ObjectInputStream.java:2299) 
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2254) 
at com.Server_1.ClientThread_special.run(ClientThread_special.java:30) 
at java.lang.Thread.run(Thread.java:1096) 
Caused by: java.lang.NoClassDefFoundError: servers.Coordinate 
Caused by: java.lang.ClassNotFoundException: servers.Coordinate in loader dalvik.system.PathClassLoader@43d02e18 
at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243) 

現在，這裏是我的代碼在服務器端：

clientSocket = serverSocket.accept(); 
     System.out.println("S-a conectat clientul de monitorizare!"); 


     os=new ObjectOutputStream(clientSocket.getOutputStream()); 
     try{ 
     while(true){ 
      coord=(Coordinate)queue.take(); 
      System.out.println(coord.getLat()); 
     os.writeObject(coord); 

     os.flush(); 

     } 
     } 
     catch(Exception e) 
     { 
      e.printStackTrace(); 

     } 

在客戶端我有這樣的：

public void run() { 

    try { 
     InetAddress serverAddr = InetAddress.getByName(serverIpAddress); 

     Socket socket = new Socket(serverIpAddress, serverPort); 

     is=new ObjectInputStream(socket.getInputStream()); 



      try{ 
       while(!stop){ 

      coord=(Coordinate)is.readObject(); 

      System.out.println("Date de la clientul de monitorizare:"+coord.getLat()); 

      } 

      } 
      catch(Exception e) 
      { 
       e.printStackTrace(); 
      } 

     is.close(); 

    } catch (UnknownHostException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

---

，這裏是我的serializ能夠類我把它都在客戶端和服務器端：

public class Coordinate implements Serializable{ 

    private final double lon; 

    private final double lat; 

    private final int workerId; 



    public Coordinate(double lat, double lon, int workerId) { 

    this.lat = lat; 
    this.lon = lon; 

    this.workerId=workerId; 
    } 

    public double getLon() { 
    return lon; 
    } 

    public double getLat() { 
    return lat; 
    } 
    public int getwId(){ 
     return workerId; 
    } 


} 

---

這個類的一個實例就是我送過插座。

---

編輯：

上服務器我有以下：

包服務器;

import java.io.Serializable;

公共類座標實現Serializable {

private final double lon; 

    private final double lat; 

    private final int workerId; 



    public Coordinate(double lat, double lon, int workerId) { 

    this.lat = lat; 
    this.lon = lon; 

    this.workerId=workerId; 
    } 

    public double getLon() { 
    return lon; 
    } 

    public double getLat() { 
    return lat; 
    } 
    public int getwId(){ 
     return workerId; 
    } 


} 

在客戶端我有以下：

包com.Server_1;

import java.io.Serializable;

公共類座標實現Serializable {

private final double lon; 

    private final double lat; 

    private final int workerId; 

    public Coordinate(double lat, double lon, int workerId) { 

    this.lat = lat; 
    this.lon = lon; 

    this.workerId=workerId; 
    } 

    public double getLon() { 
    return lon; 
    } 

    public double getLat() { 
    return lat; 
    } 
    public int getwId(){ 
     return workerId; 
    } 


} 

我不明白我怎麼能更改包是他們兩人的相同!!!!!!

Answer 1

該類的包名稱在服務器和客戶端上必須相同。我也將serialVersionUID添加到類中。 Implementing Serializable