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我正在尝试从我的 Java 本地应用程序上传一个将包含文件的对象到服务器。我的计划是在 tomcat 上运行的 servlet 将使用ObjectInputStreamindoGet方法获取对象。但我得到一个EOFE异常`。

这是客户端代码

import java.io.*;
import java.net.*;
public class Client {
    public static void main(String[] args) throws IOException {
        FileInputStream inputStream = new FileInputStream("c:\\rafi.txt");
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int n = 0;
        while (-1 != (n = inputStream.read(buffer))) {
            output.write(buffer, 0, n);
        }
        inputStream.close();
        File2 c2 = new File2(buffer);
        URL url = new URL("http://localhost:8080/servertest/Server");
        URLConnection cnx = url.openConnection();
        cnx.setDoInput(true);
        cnx.setDoOutput(true);
        cnx.setRequestProperty("Content-Type", "application/octet-stream");
        InputStream in = cnx.getInputStream();
        OutputStream out = cnx.getOutputStream();
        cnx.connect();
        ObjectOutputStream oos = new ObjectOutputStream(out);
        oos.writeObject(c2);
        oos.flush();
        oos.close();
        ObjectInputStream ois = new ObjectInputStream(in);
        boolean readBoolean = ois.readBoolean();
        System.out.println(readBoolean);
        ois.close();
        in.close();
        out.close();
    }
}

这是服务器的 servlet

import java.io.*;
import javax.servlet.*;
@WebServlet("/Server")
public class Server extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public Server() {
        super();
    }
    protected void doGet(HttpServletRequest req, HttpServletResponse res)
            throws ServletException, IOException {
        InputStream in = req.getInputStream();
        OutputStream out = res.getOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(out);
        ObjectInputStream ois = new ObjectInputStream(in);

        File2 data_in;
        try {
            data_in = (File2) ois.readObject();
            byte[] a = new byte[data_in.mybytearray.length];
            System.arraycopy(data_in.mybytearray, 0, a, 0,data_in.mybytearray.length);
            System.out.println(a.toString());
            oos.writeBoolean(true);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            oos.writeBoolean(false);
        }
        finally{
            oos.close();
            }

        res.setContentType("java-internal/" + File2.class.getName());
        in.close();
    }
}

当我调试服务器端并运行客户端时，我在这一行中得到了异常

ObjectOutputStream oos = new ObjectOutputStream(out);

这是我得到的错误

SEVERE: Servlet.service() for servlet [test1.Server] in context with path [/servertest] threw exception
java.io.EOFException
    at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source)
    at java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source)
    at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
    at java.io.ObjectInputStream.<init>(Unknown Source)
    at test1.Server.doGet(Server.java:38)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

我看到了这个问题，但我没有帮助我。我正在使用tomcat 7。

4

2 回答 2

2 
InputStream in = cnx.getInputStream();
OutputStream out = cnx.getOutputStream();

将URLConnection#getInputStream()立即将 HTTP 请求发送到服务器以检索响应正文。就像您编写代码的方式一样，这发生在您向 HTTP 请求正文写入任何位之前。因此EOFException在服务器端。

在将必要的数据写入 HTTP 请求正文URLConnection#getInputStream() 之后，您需要请求 HTTP 响应正文。这是一个重写：

URLConnection connection = new URL("http://localhost:8080/servertest/Server").openConnection();
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "application/octet-stream");

ObjectOutputStream oos = new ObjectOutputStream(connection.getOutputStream());
oos.writeObject(c2);
oos.close();

ObjectInputStream ois = new ObjectInputStream(connection.getInputStream());
boolean readBoolean = ois.readBoolean();
ois.close();

System.out.println(readBoolean);

此外，由于您基本上是在发送 HTTP POST 请求，因此您需要在 servlet 的doPost()方法而不是doGet()方法中处理它。

与具体问题无关：这并不是通过 HTTP 发送文件的最佳方式。虽然它可能有效，但它与 Java 序列化机制非常紧密地耦合在一起。我建议改为发送 HTTPmultipart/form-data请求。这可以通过客户端的Apache HttpComponents Client和服务器端的Apache Commons FileUpload来实现。这样，servlet 就可以用于其他目的，例如前面的 HTML 表单<input type="file">。客户端也可以通过这种方式被重用以将文件上传到其他 HTTP 网站。

于 2011-05-17T20:29:43.450 回答
1

我在客户端解决了这个 pbm ：

HttpURLConnection cnx = (HttpURLConnection) new URL("http://localhost:8080/web").openConnection();
cnx.setRequestMethod("PUT");
于 2012-03-27T13:19:56.473 回答