org.apache.http.ssl.TrustStrategy 上的 ClassNotFoundException

Question

我正在尝试运行一个发出 HTTP/HTTPS POST 请求的插件。在它上面声明了所需的依赖关系，即httpclient 和httpcore。我分别使用版本 4.5.3 和 4.4.6。虽然全部正确导入（我的意思是），但我在执行时收到了这个错误：

Caused by: java.lang.NoClassDefFoundError: 
org/apache/http/ssl/TrustStrategy
25.06 19:59:12 [Server] INFO at 
com.b5team.postrequest.Main.onCommand(Main.java:77) ~[?:?]
25.06 19:59:12 [Server] INFO at 
org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~
[Spigot.jar:git-Spigot-3fb9445-6e3cec8]
25.06 19:59:12 [Server] INFO ... 10 more
25.06 19:59:12 [Server] INFO Caused by: 
java.lang.ClassNotFoundException: org.apache.http.ssl.TrustStrategy

这是我的代码：

package com.b5team.postrequest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;

public class SocketPOSTRequest {

    public void sendRequest(String myurl, String hash, String args[]) throws KeyManagementException, NoSuchAlgorithmException, KeyStoreException, ClientProtocolException, IOException {

        HttpClientBuilder b = HttpClientBuilder.create();

        SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {

            public boolean isTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
                return true;
            }
        }).build();

        b.setSSLContext(sslContext);

        HostnameVerifier hostnameVerifier = NoopHostnameVerifier.INSTANCE;

        SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContext, hostnameVerifier);
        Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory> create()
                .register("http", PlainConnectionSocketFactory.getSocketFactory())
                .register("https", sslSocketFactory)
                .build();

        PoolingHttpClientConnectionManager connMgr = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
        b.setConnectionManager(connMgr);

        HttpClient client = b.build();
        HttpPost post = new HttpPost(myurl);

        List<NameValuePair> params = new ArrayList<NameValuePair>(args.length);
        params.add(new BasicNameValuePair("hash", hash));

        for(int i = 0; i < args.length; i++) {
            params.add(new BasicNameValuePair("arg"+i, args[i]));
        }

        post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
        HttpResponse response = client.execute(post);
        HttpEntity entity = response.getEntity();

        if (entity != null) {

            InputStream in = entity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            String line;

            System.out.println("[POSTRequest] Data sent successfully!");

            while ((line = reader.readLine()) != null) {
                System.out.println("[POSTRequest] Report: "+line);
            }
        }
    }
}

编辑： 我使用 Ant 构建，并且正确添加了依赖项。我也用 Maven 进行了测试，添加了依赖项，但错误仍然存​​在。

EDIT2： 切换到 Maven，添加了 maven-shade-plugin 和 maven-compile-plugin。错误消失了，但现在得到了这个java.lang.NoSuchMethodError: org.apache.http.impl.client.HttpClientBuilder.setSSLContext。使用 junit 运行时，不会出现任何错误。它仅在服务器上运行时发生，即 Spigot 1.11.2 Minecraft 服务器。

Answer 1

如果您使用的是 maven 项目，请在您的 pom.xml 文件中添加以下依赖项。

 <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.3</version>
</dependency>

Answer 2

所以，我用 javax sslcontext 方法替换了 apache httpclient 和 httpcore 中的 sslcontext 方法。现在，一切正常。请记住，上面的代码在纯 java 上正常工作。真正的问题是在 Minecraft 服务器上运行时。

不管怎样，我会把新代码放在下面，作为文档，也许对某人有帮助。

package com.b5team.postrequest;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.KeyManager;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

public class HttpsPOSTRequest {

    public static void sendRequest(String myurl, String hash, String args[]) throws NoSuchAlgorithmException, KeyManagementException {

        try {
            SSLContext context = SSLContext.getInstance("TLS");
            context.init(new KeyManager[0], new TrustManager[] {new DefaultTrustManager()}, new SecureRandom());
            SSLContext.setDefault(context);

            URL url = new URL(myurl);
            HttpsURLConnection con = (HttpsURLConnection)url.openConnection();
            con.setHostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String arg0, SSLSession arg1) {
                    return true;
                }
            });

            con.setRequestMethod("POST");
            con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            con.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0;Windows98;DigExt)");
            con.setDoOutput(true);
            con.setDoInput(true);

            ArrayList<String> params = new ArrayList<String>(args.length + 1);

            DataOutputStream output = new DataOutputStream(con.getOutputStream());
            output.writeBytes("hash=" + hash);
            for(int i = 0; i < params.size(); i++) {
                output.writeBytes("&");
                output.writeBytes("arg" + i + "=" + args[i]);
                output.flush();
            }

            output.flush();
            output.close();

            DataInputStream input = new DataInputStream(con.getInputStream());
            BufferedReader reader = new BufferedReader(new InputStreamReader(input));
            String line;

            System.out.println("[POSTRequest] Data sent successfully!");
            System.out.println("[POSTRequest] Resp Code:"+con.getResponseCode());
            System.out.println("[POSTRequest] Resp Message:"+con.getResponseMessage());

            while ((line = reader.readLine()) != null) {
                System.out.println("[POSTRequest] Report: "+line);
            }

            input.close();

        } catch (UnsupportedEncodingException e) {
            System.out.println("[POSTRequest] Encoding error. Maybe string have invalid caracters.");
            e.printStackTrace();
        } catch (MalformedURLException e) {
            System.out.println("[POSTRequest] Invalid URL. Verify your URL and try again.");
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("[POSTRequest] Error on HTTPS connection.");
            e.printStackTrace();
        }
    }

    private static class DefaultTrustManager implements X509TrustManager {

        @Override
        public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}

        @Override
        public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {}

        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return null;
        }
    }
}