Springboot RestTemplate如何配置http和https

RestTemplate 基本使用這里不說了，拿最簡單的配置來對比吧。看代碼比較直接，先來看一個基本配置

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
 
@Configuration
public class RestTemplateConfig {
 
	@Bean
	public RestTemplate restTemplate(ClientHttpRequestFactory factory) {
		return new RestTemplate(factory);
	}
 
	@Bean
	public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
		SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
		factory.setReadTimeout(5000);
		factory.setConnectTimeout(15000);
		return factory;
	}
}

RestTemplate封裝很好，這個配置操作http請求基本夠用了，但是卻不支持https。
可能是對於spring封裝的代碼有信心，就想找找有沒有替代的類，我首先想到的是ClientHttpRequestFactory接口的實現類。
果然，在SimpleClientHttpRequestFactory類下面找到了一個子類SkipSslVerificationHttpRequestFactory，可惜這個類不對外暴露，只能同包引用。

這個類在spring-boot-actuator-autoconfigure的jar包中，如果項目中沒有引用的話可以直接復制我下面貼的代碼，有的話可以直接在自己代碼中找到這個類

/*
 * Copyright 2012-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
package org.springframework.boot.actuate.autoconfigure.cloudfoundry.servlet;
 
import java.io.IOException;
import java.net.HttpURLConnection;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
 
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
 
import org.springframework.http.client.SimpleClientHttpRequestFactory;
 
/**
 * {@link SimpleClientHttpRequestFactory} that skips SSL certificate verification.
 *
 * @author Madhura Bhave
 */
class SkipSslVerificationHttpRequestFactory extends SimpleClientHttpRequestFactory {
 
	@Override
	protected void prepareConnection(HttpURLConnection connection, String httpMethod)
			throws IOException {
		if (connection instanceof HttpsURLConnection) {
			prepareHttpsConnection((HttpsURLConnection) connection);
		}
		super.prepareConnection(connection, httpMethod);
	}
 
	private void prepareHttpsConnection(HttpsURLConnection connection) {
		connection.setHostnameVerifier(new SkipHostnameVerifier());
		try {
			connection.setSSLSocketFactory(createSslSocketFactory());
		}
		catch (Exception ex) {
			// Ignore
		}
	}
	private SSLSocketFactory createSslSocketFactory() throws Exception {
		SSLContext context = SSLContext.getInstance("TLS");
		context.init(null, new TrustManager[] { new SkipX509TrustManager() },
				new SecureRandom());
		return context.getSocketFactory();
	}
	private class SkipHostnameVerifier implements HostnameVerifier {
 
		@Override
		public boolean verify(String s, SSLSession sslSession) {
			return true;
		}
	}
 
	private static class SkipX509TrustManager implements X509TrustManager {
 
		@Override
		public X509Certificate[] getAcceptedIssuers() {
			return new X509Certificate[0];
		}
 
		@Override
		public void checkClientTrusted(X509Certificate[] chain, String authType) {
		}
 
		@Override
		public void checkServerTrusted(X509Certificate[] chain, String authType) {
		}
	}
 
}

這個類代碼很簡潔，沒有多余依賴，主要做了ssl的單項認證，同時支持http和https，下接下來就不用說了，復制一份到本地包，我這里起名SslClientHttpRequestFactory，然后替換掉之前的SimpleClientHttpRequestFactory。

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
 
@Configuration
public class RestTemplateConfig {
 
	@Bean
	public RestTemplate restTemplate(ClientHttpRequestFactory factory) {
		return new RestTemplate(factory);
	}
 
	@Bean
	public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
		SslClientHttpRequestFactory factory = new SslClientHttpRequestFactory();
		factory.setReadTimeout(5000);
		factory.setConnectTimeout(15000);
		return factory;
	}
}

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