java.io.FileNotFoundException: 在访问 REST 服务时

Question

我正在尝试通过 REST API post 方法访问 Web 服务并以 FileNotFoundException

结束

代码：

public class TestService {

    static {
        disableSSLVerification();
    }

    public static void main(String[] args) {

        String[] names = {"login","seq","password"};    
        String[] values = { "admin", "2811", "admin" }; 

        String url = "https://localhost:8844/login";

        try {
            httpPost(url, names, values);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    public static String httpPost(String urlStr, String[] paramName, String[] paramVal) throws Exception {
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setUseCaches(false);
        conn.setAllowUserInteraction(false);
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

        OutputStream out = conn.getOutputStream();
        Writer writer = new OutputStreamWriter(out, "UTF-8");
        for (int i = 0; i < paramName.length; i++) {
            writer.write(paramName[i]);
            writer.write("=");
            writer.write(URLEncoder.encode(paramVal[i], "UTF-8"));
            writer.write("&");
        }
        System.out.println("WRITER: " + writer);
        writer.close();
        out.close();

        if (conn.getResponseCode() != 200) {
            throw new IOException(conn.getResponseMessage());
        }

        BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        StringBuilder sb = new StringBuilder();
        String line;
        while ((line = rd.readLine()) != null) {
            sb.append(line);
        }
        rd.close();

        conn.disconnect();
        return sb.toString();
    }

    public static void disableSSLVerification() {

        TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return null;
            }

            public void checkClientTrusted(X509Certificate[] certs, String authType) {
            }

            public void checkServerTrusted(X509Certificate[] certs, String authType) {
            }

        } };

        SSLContext sc = null;
        try {
            sc = SSLContext.getInstance("SSL");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
        } catch (KeyManagementException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());

        HostnameVerifier allHostsValid = new HostnameVerifier() {
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        };      
        HttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);       
    }
}

日志：

java.io.FileNotFoundException: https://localhost:8844/login
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown S
ource)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown So
urce)
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unkn
own Source)

谁能帮我解决这个问题？请尽量帮我标记这个 'duplicate'.

Answer 1

其实是一个HttpsURL连接（你打开的是一个https://url）
URL不存在，请用浏览器打开试试。如果 url 存在，则可能是您在该 https 主机上使用了自签名证书，该证书被 java url 连接类拒绝（但我不不认为是这种情况，例外情况应该有所不同，在这种情况下，您将需要实现一个无论如何都接受证书的包装器）。

Answer 2

由于方法签名存在问题，因此未收到响应。它已经更新。我已经相应地改变了，现在它工作正常。

String[] names = {"username","password"};    
String[] values = { "admin", "admin" }; 
String url = "https://localhost:8844/session";

Answer 3

您可以尝试删除：

conn.setDoOutput(true);
conn.setDoInput(true);

java.io.FileNotFoundException: 在访问 REST 服务时

java.io.FileNotFoundException: while accessing REST service

java

rest

web-services

filenotfoundexception