restTemplate发送https请求

场景

restTemplate发送http请求时没问题，发送https请求时要求验证证书，造成请求失败。

解决方案

方案一 忽略证书验证

新建一个SSL类，代码：

public class SSL 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) {
        }

    }

}

Application或者Configuration类里面配置restTemplate：

@Bean
@Resource(name="simpleClientHttpRequestFactory") // 在多ClientHttpRequestFactory的时候指定用哪个
public RestTemplate restTemplate(ClientHttpRequestFactory factory) {
    return new RestTemplate(factory);
}

@Bean
public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
    SSL factory = new SSL();
    factory.setReadTimeout(60000);
    factory.setConnectTimeout(30000);//单位为ms
    return factory;
}

这样就可以发送https请求了。

好处是代码相对简单，开发速度快。
缺点是不太安全。

方案二 添加证书列表

好处是更安全。
缺点是代码稍复杂，要多花点时间研究。

代码暂略。