Question

我有Drugbean对象，必须插入数据库我使用对象输入流，以便当我将对象的数据插入数据库时从另一个类获取对象我得到java.io.EOFException

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        int flag=0;
        ObjectInputStream inputStream = null;
        ObjectOutputStream outputStream = null;
        DrugModel drugBean = new DrugModel();
        List<DrugModel> itemFromClient = new ArrayList<DrugModel>();
        List<String> itemToClient = new ArrayList<String>();    
        try {           
            inputStream = new ObjectInputStream(request.getInputStream());          
            while((drugBean = (DrugModel) inputStream.readObject())!=null){             
                flag = MakeConnection.insertDrugRecord(drugBean);                           
            }                           
            inputStream.close();                        
            if (flag == 1) {
                itemToClient.add("true");
                outputStream = new ObjectOutputStream(response.getOutputStream());
                outputStream.writeObject(itemToClient);
            } else {
                itemToClient.add("false");
                outputStream = new ObjectOutputStream(response.getOutputStream());
                outputStream.writeObject(itemToClient);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

cosole.error

java.io.EOFException
    at java.io.ObjectInputStream$BlockDataInputStream.peekByte(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    at com.medeil_plus.SyncDrugTable.doPost(SyncDrugTable.java:47)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

Answer 1

致电EOFException时，

readObject()是正常的。当你到达流的末尾时会发生这种情况。

您的错误在于假设它在流结束时返回null。它没有。它可以在您写入null时返回null。

因此，您的阅读循环应为while (true)，并明确表示EOFException将其退出。

这里使用Object Input Stream将对象数据插入数据库

1 个答案: