问题描述

在httpclient中使用Serializable接口报错

public static void main(String[] args) throws IOException ClassNotFoundException
{
String url = ""http://localhost:8080/RmiJetty/test"";

    Scanner sc1 = new Scanner(System.in);    String queryString1 = ""num1 = 1"";    String queryString2 = ""num2 = 1"";    String inputObj = sc1.next();    Serializable s = getObjFromServer(url queryString1queryString2 inputObj);    System.out.println(s.toString());}/** * @param url * @param queryString 类似a=b&c=d 形式的参数 *  * @param inputObj   发送到服务器的对象。 *      * @return 服务器返回到客户端的对象。 * @throws IOException */public static Serializable getObjFromServer(String url String queryString1String queryString2Serializable inputObj) throws IOException{    HttpClient client = new HttpClient();    PostMethod post = new PostMethod(url);    post.setQueryString(queryString1);    post.setQueryString(queryString2);    post.setRequestHeader(""Content-Type""application/octet-stream"");    java.io.ByteArrayOutputStream bOut = new java.io.ByteArrayOutputStream(1024);    java.io.ByteArrayInputStream bInput = null;    java.io.ObjectOutputStream out = null;    Serializable returnObj = null;    try    {        out = new java.io.ObjectOutputStream(bOut);        out.writeObject(inputObj);        out.flush();        out.close();        out = null;        bInput = new java.io.ByteArrayInputStream(bOut.toByteArray());        RequestEntity re = new InputStreamRequestEntity(bInput);        post.setRequestEntity(re);        client.executeMethod(post);        java.io.InputStream in = post.getResponseBodyAsStream();        java.io.ObjectInputStream oInput = new java.io.ObjectInputStream(in);        returnObj = (Serializable) oInput.readObject();        oInput.close();        oInput = null;    }    catch (IOException e)    {        // TODO Auto-generated catch block        e.printStackTrace();    }    catch (ClassNotFoundException e)    {        // TODO Auto-generated catch block        e.printStackTrace();    }    finally    {        if (out != null)        {            out.close();            out = null;        }        if (bInput != null)        {            bInput.close();            bInput = null;        }        //释放连接        post.releaseConnection();    }    return returnObj;}

下面是servlet：
public class servlet1 extends HttpServlet{

 protected void doGet(HttpServletRequest request HttpServletResponse response)   throws ServletException IOException {     String strnum1 = request.getParameter(""num1"");     String strnum2 = request.getParameter(""num2"");     //String strnum3 = request.getParameter(""inputObj"");     java.io.ObjectInputStream oi = null;     java.io.ObjectOutputStream ot = null;     String url=""rmi://127.0.0.1/Hello"";      //hello表示为一个token，类似秘钥    try {      NumServer  server = (NumServer)Naming.lookup(url);      oi = new java.io.ObjectInputStream(request.getInputStream());      Object o = oi.readObject();      oi.close();      oi = null;      //int result = Integer.parseInt(strnum1) + Integer.parseInt(o.toString());      int a = Integer.parseInt(strnum1);      int b = Integer.parseInt(strnum2);      int result = server.num(abo.toString());      ot = new java.io.ObjectOutputStream(response.getOutputStream());      ot.writeObject(result);      ot.flush();      ot.close();      ot = null;      PrintWriter pw = response.getWriter();      pw.println(result);    }catch (IOException e)    {        // TODO Auto-generated catch block        e.printStackTrace();    }    catch (ClassNotFoundException e)    {        // TODO Auto-generated catch block        e.printStackTrace();    } catch (NotBoundException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }    finally    {        try        {            if (oi != null)            {                oi.close();                oi = null;            }            if (ot != null)            {                ot.close();                ot = null;            }        }        catch (IOException e)        {            // TODO Auto-generated catch block            e.printStackTrace();        } 

}

}
}
这是报的错：
java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2281)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2750)
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:780)
at java.io.ObjectInputStream.(ObjectInputStream.java:280)
at RmiClient.HttpClientTest1.getObjFromServer(HttpClientTest1.java:79)
at RmiClient.HttpClientTest1.main(HttpClientTest1.java:31)
Exception in thread ""main"" java.lang.NullPointerException
at RmiClient.HttpClientTest1.main(HttpClientTest1.java:33)
求大神帮忙啊

解决方案

main函数里有空值。你看看这几行代码有没有空值。
String inputObj = sc1.next();

Serializable s = getObjFromServer(url queryString1queryString2 inputObj);System.out.println(s.toString());