Question

我通过servlet将文件上传到我的服务器上。它一直很好，直到今天下午，突然间我开始得到

java.io.IOException: Server returned HTTP response code: 500 for URL: http://localhost:8282

我一直在使用tomcat 7进行应用程序，并且工作正常。我不确定服务器内发生了什么事情，或者问题究竟发生在哪里。

我试过了：

更改不同的端口
清理，删除和使用不同的服务器（Vfabric）
将JAVA_TOOL_OPTIONS添加到系统变量。
卸载并重新安装tomcat。
尝试重新启动系统以查看是否有任何打开/守护程序线程挂起。
增加了tomcat文件夹中server.xml的最大线程大小。

我无法找到解决问题的其他可行方案。如果可能，请建议并提供见解。

以下是我的应用程序中的代码:(客户端代码）：

private URLConnection getServletConnection() throws MalformedURLException,
            IOException {

        // Config
        servletConnection.setDoInput(true);
        servletConnection.setDoOutput(true);
        servletConnection.setUseCaches(false);
        servletConnection.setDefaultUseCaches(false);
        servletConnection.setRequestMethod("POST");
        servletConnection.setRequestProperty("Content-Type",
                "multipart/form-data;boundary=" + this.boundary);
        servletConnection.setRequestProperty("Connection", "Keep-Alive");
        servletConnection.connect();
        return servletConnection;
    }

    private boolean onSendData(String fileEntry) {
        try {
            // Send data to the servlet
            HttpURLConnection servletConnection = (HttpURLConnection) getServletConnection();
            DataOutputStream dataOutputStream = new DataOutputStream(
                    servletConnection.getOutputStream());
            final FileInputStream fileInputStream = new FileInputStream(
            ...
            // send multipart form data necesssary after file data
            dataOutputStream.writeBytes(lineEnd);
            dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens
                    + lineEnd);


            // Receive result from servlet
            InputStream inputStream = servletConnection.getInputStream();
            ObjectInputStream objectInputStream = new ObjectInputStream(
                    inputStream);
            String result = (String) objectInputStream.readObject();

            objectInputStream.close();
            inputStream.close();
            dataOutputStream.flush();
            dataOutputStream.close();
            fileInputStream.close();

        } catch (java.net.MalformedURLException mue) {
            mue.printStackTrace();
            System.out
                    .println("Invalid serlvetUrl, error: " + mue.getMessage());
            errorLabel.setText(mue.getMessage());
        } catch (java.io.IOException ioe) {
            ioe.printStackTrace();
            System.out.println("Couldn't open a URLConnection, error: "
                    + ioe.getMessage());
            errorLabel.setText(ioe.getMessage());
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("Exception caught, error: " + e.getMessage());
            errorLabel.setText(e.getMessage());
        }
        return fileUploaded;
    }

这就是我所看到的错误（当我在我的IDE中运行代码时）：

Caused by: java.io.IOException: Server returned HTTP response code: 500 for URL: http://localhost:8282/UploadFile/upload
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1626)
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
    at com.FileUpload.onSendData(FileUpload.java:317)
    ... 4 more

奇怪的是，当我在网络浏览器上运行它（作为一个签名的JAR文件运行）时，我在java控制台中看到以下错误（这是一个小程序）。

java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at sun.net.NetworkClient.doConnect(Unknown Source)
    at sun.net.www.http.HttpClient.openServer(Unknown Source)
    at sun.net.www.http.HttpClient.openServer(Unknown Source)
    at sun.net.www.http.HttpClient.<init>(Unknown Source)
    at sun.net.www.http.HttpClient.New(Unknown Source)
    at sun.net.www.http.HttpClient.New(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
   Couldn't open a URLConnection, error: Connection refused: connect

具有io异常的http 500 servlet - 处于不确定状态

0 个答案: