忽略SSL

import org.springframework.http.client.SimpleClientHttpRequestFactory;

import javax.net.ssl.*;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;

/**
 * 跳过证书验证封装
 */
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) {
        }

    }

}

@Bean
public RestTemplate restTemplate(ClientHttpRequestFactory factory) {
    return new RestTemplate(factory);
}

@Bean
public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
    SSL factory = new SSL();
    factory.setReadTimeout(30000);
    factory.setConnectTimeout(30000);
    return factory;
}

POST

HttpEntity<Map<String, Object>> httpEntity = new HttpEntity<>(postData, headers);
HttpEntity<String> o = restTemplate.postForEntity("URL", httpEntity, String.class);
JSONObject jsonObject1 = JSON.parseObject(o.getBody());

GET

HttpEntity<String> requestEntity = new HttpEntity<>(headers);
ResponseEntity<String> resEntity = restTemplate.exchange("URL", HttpMethod.GET, requestEntity, String.class);
JSONObject hostJsonObject = JSON.parseObject(resEntity.getBody());

PUT

@Test
public void a() {
    URI uri = UriComponentsBuilder.fromUriString("url").build().toUri();
    RequestEntity<String> requestEntity = RequestEntity.put(uri)
            .headers(headers)
            .body(jsonObject.toJSONString());
    ResponseEntity<String> resEntity = restTemplate.exchange(requestEntity, String.class);
    return resEntity.toString();
}

DELETE

@Test
public void a() {
    HttpEntity<String> requestEntity = new HttpEntity<>(headers);
    ResponseEntity<String> resEntity = restTemplate.exchange("URL", HttpMethod.DELETE, requestEntity, String.class);
    HttpStatus httpStatus = resEntity.getStatusCode();
    result = httpStatus.is2xxSuccessful();
}