Rest服务可在浏览器中访问，而不是在Java代码中访问

我已经在服务器a上创建了一个restful Web服务。 我试图在客户端的vpn环境中使用Java类调用此服务。从代码中点击时的服务将我的错误显示为连接被拒绝，但在浏览器中调用时可以访问

我尝试使用相同的代码从公共互联网访问相同的服务，它工作得很好

我正在使用

URLConnection

以Java代码调用该服务。 也尝试应用下面的代码，但没有帮助

connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11");

可能的原因是什么？有什么建议吗

编辑：附加代码

private final String crlf = "\r\n";
    private String url;
    private String boundary;
    private final int bufferSize = 4096;

    public UploadFiles(String argUrl) {
        url = argUrl;
        System.out.println(url);
        logEntry(url);
        boundary = "---------------------------4664151417711";
    }

    public int post() throws MalformedURLException, IOException {
        String charset = "UTF-8";
        String param = "value";
        String boundary = Long.toHexString(System.currentTimeMillis()); // Just generate some unique random value.
        String CRLF = "\r\n"; // Line separator required by multipart/form-data.

        URLConnection connection = new URL(url).openConnection();
        connection.setDoOutput(true);
        connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11");
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

        try (
                OutputStream output = connection.getOutputStream();
                PrintWriter writer = new PrintWriter(new OutputStreamWriter(output, charset), true);) {

            File fileDir = new File(HomeController.configBean.getFilePath());
            File[] listFiles = fileDir.listFiles();

            for (File file : listFiles) {
                // Send text file.
                writer.append("--" + boundary).append(CRLF);
                writer.append("Content-Disposition: form-data; name=\"textFile\"; filename=\"" + file.getName() + "\"").append(CRLF);
                writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF); // Text file itself must be saved in this charset!
                writer.append(CRLF).flush();
                Files.copy(file.toPath(), output);
                output.flush(); // Important before continuing with writer!
                writer.append(CRLF).flush(); // CRLF is important! It indicates end of boundary.
            }
            // End of multipart/form-data.
            writer.append("--" + boundary + "--").append(CRLF).flush();
        } catch (IOException ex) {
            Logger.getLogger(UploadFiles.class.getName()).log(Level.SEVERE, null, ex);
        }

// Request is lazily fired whenever you need to obtain information about response.
        int responseCode = ((HttpURLConnection) connection).getResponseCode();
        System.out.println(responseCode); // Should be 200

        return responseCode;
    } // post() method

编辑2：错误

java.net.ConnectException: Connection refused: connect
        at java.net.DualStackPlainSocketImpl.connect0(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 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.plainConnect0(Unknown Sou
rce)
        at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Sour
ce)
        at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
        at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(Unknown
Source)
        at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(Unknown S
ource)
        at testfileupload.UsingURLConnection.uploadFilesUsingURLConnecton(UsingU
RLConnection.java:42)
        at testfileupload.FormUploadTestController.lambda$0(FormUploadTestContro
ller.java:62)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Comp
ositeEventHandler.java:86)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventH
andlerManager.java:238)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventH
andlerManager.java:191)
        at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(C
ompositeEventDispatcher.java:59)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDis
patcher.java:58)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispat
chChainImpl.java:114)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDis
patcher.java:56)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispat
chChainImpl.java:114)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDis
patcher.java:56)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispat
chChainImpl.java:114)
        at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
        at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
        at javafx.event.Event.fireEvent(Event.java:198)
        at javafx.scene.Node.fireEvent(Node.java:8413)
        at javafx.scene.control.Button.fire(Button.java:185)
        at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(Bu
ttonBehavior.java:182)
        at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorS
kinBase.java:96)
        at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorS
kinBase.java:89)
        at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.h
andleBubblingEvent(CompositeEventHandler.java:218)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Comp
ositeEventHandler.java:80)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventH
andlerManager.java:238)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventH
andlerManager.java:191)
        at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(C
ompositeEventDispatcher.java:59)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDis
patcher.java:58)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispat
chChainImpl.java:114)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDis
patcher.java:56)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispat
chChainImpl.java:114)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDis
patcher.java:56)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispat
chChainImpl.java:114)
        at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
        at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
        at javafx.event.Event.fireEvent(Event.java:198)
        at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
        at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
        at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
        at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotificatio
n.run(GlassViewEventHandler.java:381)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotificatio
n.run(GlassViewEventHandler.java:295)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEve
nt$354(GlassViewEventHandler.java:417)
        at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Quantum
Toolkit.java:389)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Glas
sViewEventHandler.java:416)
        at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
        at com.sun.glass.ui.View.notifyMouse(View.java:937)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.ja
va:191)
        at java.lang.Thread.run(Unknown Source) 

---

我做错什么了吗？请建议。

我用Postman示例API尝试了这个，它对我来说很好，可以打印200

public void UploadFiles(String argUrl) {
    url = argUrl;
    System.out.println(url);
    boundary = "---------------------------4664151417711";
}

public static void main(String...strings) throws MalformedURLException, IOException {
    String charset = "UTF-8";
    String param = "value";
    String boundary = Long.toHexString(System.currentTimeMillis()); // Just generate some unique random value.
    String CRLF = "\r\n"; // Line separator required by multipart/form-data.

    HttpURLConnection connection = (HttpURLConnection) new URL("https://postman-echo.com/post").openConnection();
    connection.setDoOutput(true);
    connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11");
    connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

    try { 
        OutputStream output = connection.getOutputStream();
        PrintWriter writer = new PrintWriter(new OutputStreamWriter(output, charset), true);

        File fileDir = new File("C:\\Test");
        File[] listFiles = fileDir.listFiles();

        for (File file : listFiles) {
            // Send text file.
            writer.append("--" + boundary).append(CRLF);
            writer.append("Content-Disposition: form-data; name=\"textFile\"; filename=\"" + file.getName() + "\"").append(CRLF);
            writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF); // Text file itself must be saved in this charset!
            writer.append(CRLF).flush();
            Files.copy(file.toPath(), output);
            output.flush(); // Important before continuing with writer!
            writer.append(CRLF).flush(); // CRLF is important! It indicates end of boundary.
        }
        writer.append("--" + boundary + "--").append(CRLF).flush();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

    int responseCode = ((HttpURLConnection) connection).getResponseCode();
    System.out.println(responseCode); // Should be 200
    if(connection!=null) {
        connection.disconnect();
    }

}

---

接受

标题，…网络。。。但是，我建议您使用

restemplate

几乎所有内容。您能分享确切的例外情况和代码示例吗？您的浏览器中是否配置了所需的代理，但Java应用程序中没有？在客户端VM上。。。可能是任何与网络相关的东西。代理、防火墙、被阻止的端口。。。我会试着向客户询问他们的基础设施。@Harshita Sethi:-您需要关闭连接，让我知道它是否适合您。URLConnection没有名为

disconnect（）

的方法。他使用的是HttpURLConnection类，而您使用的是URLConnection类。请更改为HttpUrlConnection导入java.net.HttpUrlConnection我猜您的意思正好相反。。并且这些类属于同一个包，在处理http请求时最好使用httpurl连接。@Vigneshwaran请仔细检查一下

public void UploadFiles(String argUrl) {
    url = argUrl;
    System.out.println(url);
    boundary = "---------------------------4664151417711";
}

public static void main(String...strings) throws MalformedURLException, IOException {
    String charset = "UTF-8";
    String param = "value";
    String boundary = Long.toHexString(System.currentTimeMillis()); // Just generate some unique random value.
    String CRLF = "\r\n"; // Line separator required by multipart/form-data.

    HttpURLConnection connection = (HttpURLConnection) new URL("https://postman-echo.com/post").openConnection();
    connection.setDoOutput(true);
    connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11");
    connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

    try { 
        OutputStream output = connection.getOutputStream();
        PrintWriter writer = new PrintWriter(new OutputStreamWriter(output, charset), true);

        File fileDir = new File("C:\\Test");
        File[] listFiles = fileDir.listFiles();

        for (File file : listFiles) {
            // Send text file.
            writer.append("--" + boundary).append(CRLF);
            writer.append("Content-Disposition: form-data; name=\"textFile\"; filename=\"" + file.getName() + "\"").append(CRLF);
            writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF); // Text file itself must be saved in this charset!
            writer.append(CRLF).flush();
            Files.copy(file.toPath(), output);
            output.flush(); // Important before continuing with writer!
            writer.append(CRLF).flush(); // CRLF is important! It indicates end of boundary.
        }
        writer.append("--" + boundary + "--").append(CRLF).flush();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

    int responseCode = ((HttpURLConnection) connection).getResponseCode();
    System.out.println(responseCode); // Should be 200
    if(connection!=null) {
        connection.disconnect();
    }

}