在Java中通過代理發送SOAP消息

Question

我需要知道如何設置代理並確認它是否正常工作。

我做了一個看起來像這樣的測試程序：

您可以在哪里指定代理地址和端口號。

（我找到了地址和端口： http ： //www.freeproxylists.net/ ）

選中“使用代理”時，SOAP調用看起來像這樣：

        Socket socket = new Socket();
        SocketAddress sockaddr = new InetSocketAddress(PROXY_ADDRESS, PROXY_PORT);
        socket.connect(sockaddr, 10000);
        Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(socket.getInetAddress(), PROXY_PORT));
        URL url = new URL(urlStr);
        HttpURLConnection uc = (HttpURLConnection) url.openConnection(proxy);
        return connection.call(message, uc);

這里的問題是SOAPConnection.call(..)的最后一行不允許HttpURLConnection作為輸入，從而給出：

錯誤的endPoint類型

知道如何將代理地址添加到SOAP調用並驗證代理是否正在使用？

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.MalformedURLException;
import java.net.Proxy;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.URL;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.xml.soap.MessageFactory;
import javax.xml.soap.SOAPConnection;
import javax.xml.soap.SOAPConnectionFactory;
import javax.xml.soap.SOAPException;
import javax.xml.soap.SOAPMessage;

public class TestProxy implements ActionListener {

    public JTextField proxyField;
    public JTextField portField;
    public JCheckBox useProxy;

    // GUI
    public TestProxy() {
        JFrame f = new JFrame("Proxy tester");
        f.getContentPane().setLayout(new BoxLayout(f.getContentPane(), BoxLayout.Y_AXIS));

        proxyField = new JTextField("103.247.43.218");
        portField = new JTextField("8081");
        useProxy = new JCheckBox("Use Proxy");

        JButton b = new JButton("Connect!");
        b.addActionListener(this);

        f.getContentPane().add(proxyField);
        f.getContentPane().add(portField);
        f.getContentPane().add(useProxy);
        f.getContentPane().add(b);

        f.pack();
        f.setLocationRelativeTo(null);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }

    // ACTION
    @Override
    public void actionPerformed(ActionEvent e) {

        SOAPMessage response = null;
        try {
            SOAPMessage msg = createSOAPRequest();
            String urlStr = "http://www.webservicex.net/CurrencyConvertor.asmx?WSDL";
            response = sendSOAPMessage(msg, urlStr);
        } catch (MalformedURLException e1) {
            e1.printStackTrace();
        } catch (SOAPException e1) {
            e1.printStackTrace();
        } catch (Exception e2) {
            e2.printStackTrace();
        }
        if (response == null)
            JOptionPane.showMessageDialog(null, "Null returned...");
        else
            JOptionPane.showMessageDialog(null, "Returned response!!!");
    }

    // SOAP CALL
    public SOAPMessage sendSOAPMessage(SOAPMessage message, String urlStr) throws SOAPException, MalformedURLException {

        String PROXY_ADDRESS = proxyField.getText();
        int PROXY_PORT = Integer.parseInt(portField.getText());
        try {
            SOAPConnectionFactory factory = SOAPConnectionFactory.newInstance();
            SOAPConnection connection = factory.createConnection();
            if (useProxy.isSelected()) {
                Socket socket = new Socket();
                SocketAddress sockaddr = new InetSocketAddress(PROXY_ADDRESS, PROXY_PORT);
                socket.connect(sockaddr, 10000);
                Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(socket.getInetAddress(), PROXY_PORT));
                URL url = new URL(urlStr);
                HttpURLConnection uc = (HttpURLConnection) url.openConnection(proxy);
                // This "call" is not allowed!!
                return connection.call(message, uc);
            } else {
                return connection.call(message, urlStr);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    // SOAP MESSAGE
    private static SOAPMessage createSOAPRequest() throws Exception {
        MessageFactory messageFactory = MessageFactory.newInstance();
        SOAPMessage soapMessage = messageFactory.createMessage();
        return soapMessage;
    }

    public static void main(String[] args) {
        new TestProxy();
    }
}

Answer 1

使用代理的sendSOAPMessage方法：

public static SOAPMessage sendSOAPMessage(SOAPMessage message, String url, final Proxy p) throws SOAPException, MalformedURLException {
    SOAPConnectionFactory factory = SOAPConnectionFactory.newInstance();
    SOAPConnection connection = factory.createConnection();

    URL endpoint = new URL(null, url, new URLStreamHandler() {
        protected URLConnection openConnection(URL url) throws IOException {
            // The url is the parent of this stream handler, so must
            // create clone
            URL clone = new URL(url.toString());

            URLConnection connection = null;
            if (p.address().toString().equals("0.0.0.0/0.0.0.0:80")) {
                connection = clone.openConnection();
            } else
                connection = clone.openConnection(p);
            connection.setConnectTimeout(5 * 1000); // 5 sec
            connection.setReadTimeout(5 * 1000); // 5 sec
            // Custom header
            connection.addRequestProperty("Developer-Mood", "Happy");
            return connection;
        }
    });

    try {
        SOAPMessage response = connection.call(message, endpoint);
        connection.close();
        return response;
    } catch (Exception e) {
        // Re-try if the connection failed
        SOAPMessage response = connection.call(message, endpoint);
        connection.close();
        return response;
    }
}

Answer 2

您可以使用Java Proxy的詳細信息-類此 。 實質上，您可以嘗試是否reachable指定的Proxy地址。 如果它是你可以建立一個URL連接（如下所示的HTTP連接或你自己的協議 - 如SOAP） 編輯：

使用SocketAddress嘗試使用端口值

   Socket socket = null;
        try {
            SocketAddress sockaddr = new InetSocketAddress(PROXY_ADDRESS,
                    PROXY_PORT);

            socket = new Socket();

            socket.connect(sockaddr, 10000);
            Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(
                    socket.getInetAddress(), PROXY_PORT));

            if (socket.getInetAddress().isReachable(10000)) {
                URL url = new URL("http://www.popofibo.com");
                HttpURLConnection uc = (HttpURLConnection) url
                        .openConnection(proxy);
                System.out.println("Content: " + uc.getContentType());
                uc.connect();
            }

        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                socket.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

在上面的示例中，您將建立代理連接並檢查InetAddress是否可訪問。 如果是，您可以使用代理建立http連接。

編輯：由於isReachable()的可信度值得懷疑，您可以嘗試捕獲異常並建立自己的boolean標志，下面的工作示例。

在這里，您嘗試通過Socket連接使用其地址和端口連接proxy並捕獲異常。 我用我自己的代理服務器測試了這兩個例子並且它可以工作，它肯定會失敗，因為你在示例中提到的IP 。

public static void main(String[] args) {
        Socket socket = new Socket();
        boolean proxyReachable = false;

        SocketAddress sockaddr = new InetSocketAddress(PROXY_ADDRESS,
                PROXY_PORT);

        try {
            socket.connect(sockaddr, 10000);
            proxyReachable = true;
        } catch (SocketTimeoutException e) {
            proxyReachable = false;

        } catch (IOException e) {
            proxyReachable = false;
        }

        if (proxyReachable) {
            try {
                Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(
                        socket.getInetAddress(), PROXY_PORT));

                URL url = new URL("http://www.popofibo.com");

                HttpURLConnection uc = (HttpURLConnection) url
                        .openConnection(proxy);
                System.out.println("Content: " + uc.getContentType());
                uc.connect();
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        try {
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

輸出（使用有效的代理地址/端口）：

Content: text/html; charset=UTF-8