當讀取Servlet中的序列化對象時發生EOFException

我有一個applet嘗試將java序列化對象發送給一個servlet（託管在Tomcat 6中）。這些URL是正確的，小程序到達了正確的小服務程序，但是在讀取servlet端的任何內容時，出現錯誤。當讀取Servlet中的序列化對象時發生EOFException

這裏是applet代碼：


String adresse = "/Applic_ClientsPartners/NewMemberServlet"; 
URL page = getDocumentBase(); 
String protocole = page.getProtocol(); 
String host = page.getHost(); 
int port = page.getPort(); 
System.out.println(protocole + "://" + host + ":" + port + adresse); 
URL serv = new URL(protocole, host, port, adresse); 
URLConnection conn = serv.openConnection(); 
conn.setUseCaches(false); 
conn.setDefaultUseCaches(false); 
//conn.setRequestProperty("Content-Type", "application/x-java-serialized-object"); 
conn.setRequestProperty("Content-Type", "application/octet-stream"); 
conn.setDoInput(true); 
conn.setDoOutput(true); 
System.out.println("Connection open"); 
ObjectOutputStream oos = new ObjectOutputStream(conn.getOutputStream()); 
ObjectInputStream ois = new ObjectInputStream(conn.getInputStream()); 
System.out.println("Envoi de 'test'"); //sending a test String 
String t = "test"; 
oos.writeObject(t); 
System.out.println("test flush"); 
oos.flush(); 
System.out.println("test between flush & writeObject"); 
oos.writeObject(nouveau); //this is a serializable custom object 
oos.flush(); 
//Boolean result = ois.readBoolean(); 
ois.close(); 
oos.close(); 
System.out.println("Streams fermés"); //streams closed successfully

下面是servlet代碼：


response.setContentType("application/octet-stream"); 
ObjectInputStream ois = new ObjectInputStream(request.getInputStream()); 
ObjectOutputStream oos = new ObjectOutputStream(response.getOutputStream()); 
System.out.println("AVAILABLE " + ois.available()); 
System.out.println("Pré read test"); 
String t = (String) ois.readObject(); 
System.out.println(t + " lu"); 
Cards.Member nouveau = (Cards.Member) ois.readObject(); 
System.out.println("Post read test"); 
oos.close(); 
ois.close(); 
System.out.println("Streams fermés"); //Streams closed successfully 
return;

我有一個try ... catch（IOException異常前）周圍兩個課程的。該錯誤是如下：


java.io.EOFException 
     at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2554) 
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1297) 
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) 
     at Servlets.NewMemberServlet.doPost(NewMemberServlet.java:96) 
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
     at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) 
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) 
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
     at java.lang.Thread.run(Thread.java:619)

我真的不明白這裏發生了什麼：Servlet的ObjectInputStream的，似乎什麼也沒有，但我有在同一Web項目中的另一個小程序，小服務程序，儘管與HTTP隧道，他們正在完美地工作？！

任何幫助，將不勝感激:)

來源

2011-01-27 Lupuss

有兩個調用.readObject（），這是引發異常？ – vz0 2011-01-27 14:15:46

你在標準輸出上看到的測試輸出是什麼？ – biziclop 2011-01-27 14:23:45

第一次調用readObject（）會引發Exception;至於測試輸出，它們都顯示爲applet，但servlet停在「Préread test」（所以在第一次調用readObject（）之前）。希望這可以幫助。 – Lupuss 2011-01-27 14:41:19

嘗試在你的小應用程序創建的ObjectInputStream你寫數據到ObjectOutputStream中之後。而在servlet方面，延遲ObjectOutputStream的創建。

原因：

我想怎麼寫，它應該工作（這是在正確的順序），但我知道我周圍有問題的代碼這些流設置的順序和時間。

來源

2011-01-27 14:41:40 kaliatech

在你的servlet上，先做所有的輸入處理，然後才處理輸出處理。特別是，我會重新排序你的代碼：

// Read input: 
ObjectInputStream ois = new ObjectInputStream(request.getInputStream()); 
System.out.println("AVAILABLE " + ois.available()); 
System.out.println("Pré read test"); 
String t = (String) ois.readObject(); 
System.out.println(t + " lu"); 
Cards.Member nouveau = (Cards.Member) ois.readObject(); 
System.out.println("Post read test"); 
ois.close(); 

// Write output: 
response.setContentType("application/octet-stream"); 
ObjectOutputStream oos = new ObjectOutputStream(response.getOutputStream()); 
// oos.writeObject(someSerializablebject); 
oos.close(); 
System.out.println("Streams fermés"); //Streams closed successfully

來源

2011-01-27 15:00:46

當讀取Servlet中的序列化對象時發生EOFException

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