spring集成okhttp3的步骤详解

前言

okhttp 介绍

HTTP is the way modern applications network. It's how we exchange data & media. >Doing HTTP efficiently makes your stuff load faster and saves bandwidth.

OkHttp is an HTTP client that's efficient by default:

HTTP/2 support allows all requests to the same host to share a socket.
Connection pooling reduces request latency (if HTTP/2 isn't available).
Transparent GZIP shrinks download sizes.
Response caching avoids the network completely for repeat requests.
OkHttp perseveres when the network is troublesome: it will silently recover from > >common connection problems. If your service has multiple IP addresses OkHttp will >attempt alternate addresses if the first connect fails. This is necessary for IPv4+IPv6 >and for services hosted in redundant data centers. OkHttp initiates new connections >with modern TLS features (SNI, ALPN), and falls back to TLS 1.0 if the handshake fails.

Using OkHttp is easy. Its request/response API is designed with fluent builders and immutability. It supports both synchronous blocking calls and async calls with callbacks.

OkHttp supports Android 2.3 and above. For Java, the minimum requirement is 1.7. —摘自 https://square.github.io/okhttp/

特点

1.支持http和https协议,api相同,易用;

2.http使用线程池,https使用多路复用;

3.okhttp支持同步和异步调用;

4.支持普通form和文件上传form;

5.提供了拦截器,操作请求和响应(日志,请求头,body等);

6.okhttp可以设置缓存;

准备工作

在pom.xml文件中增加以下依赖

 com.squareup.okhttp3
 okhttp
 3.6.0

书写配置类

用@Configuration注解该类，等价与XML中配置beans；用@Bean标注方法等价于XML中配置bean。

@Configuration
public class OkHttpConfiguration {
 @Bean
 public X509TrustManager x509TrustManager() {
 return new X509TrustManager() {
  @Override
  public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
  }
  @Override
  public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
  }
  @Override
  public X509Certificate[] getAcceptedIssuers() {
  return new X509Certificate[0];
  }
 };
 }
 @Bean
 public SSLSocketFactory sslSocketFactory() {
 try {
  //信任任何链接
  SSLContext sslContext = SSLContext.getInstance("TLS");
  sslContext.init(null, new TrustManager[]{x509TrustManager()}, new SecureRandom());
  return sslContext.getSocketFactory();
 } catch (NoSuchAlgorithmException e) {
  e.printStackTrace();
 } catch (KeyManagementException e) {
  e.printStackTrace();
 }
 return null;
 }
 
 @Bean
 public ConnectionPool pool() {
 return new ConnectionPool(200, 5, TimeUnit.MINUTES);
 }
 @Bean
 public OkHttpClient okHttpClient() {
 return new OkHttpClient.Builder()
  .sslSocketFactory(sslSocketFactory(), x509TrustManager())
  .retryonConnectionFailure(false)//是否开启缓存
  .connectionPool(pool())//连接池
  .connectTimeout(10L, TimeUnit.SECONDS)
  .readTimeout(10L, TimeUnit.SECONDS)
  .build();
 }
}

工具类

自己写的工具类，比较简单，不是REST风格

@Component
public class OkHttpUtil {
 private static final Logger logger = LoggerFactory.getLogger(OkHttpUtil.class);
 @Resource
 private OkHttpClient okHttpClient;
 
 public String get(String url, Map queries) {
 String responseBody = "";
 StringBuffer sb = new StringBuffer(url);
 if (queries != null && queries.keySet().size() > 0) {
  boolean firstFlag = true;
  Iterator iterator = queries.entrySet().iterator();
  while (iterator.hasNext()) {
  Map.Entry entry = (Map.Entry) iterator.next();
  if (firstFlag) {
   sb.append("?" + entry.getKey() + "=" + entry.getValue());
   firstFlag = false;
  } else {
   sb.append("&" + entry.getKey() + "=" + entry.getValue());
  }
  }
 }
 Request request = new Request
  .Builder()
  .url(sb.toString())
  .build();
 Response response = null;
 try {
  response = okHttpClient.newCall(request).execute();
  int status = response.code();
  if (status == 200) {
  return response.body().string();
  }
 } catch (Exception e) {
  logger.error("okhttp put error >> ex = {}", ExceptionUtils.getStackTrace(e));
 } finally {
  if (response != null) {
  response.close();
  }
 }
 return responseBody;
 }
 
 public String post(String url, Map params) {
 String responseBody = "";
 FormBody.Builder builder = new FormBody.Builder();
 //添加参数
 if (params != null && params.keySet().size() > 0) {
  for (String key : params.keySet()) {
  builder.add(key, params.get(key));
  }
 }
 Request request = new Request
  .Builder()
  .url(url)
  .post(builder.build())
  .build();
 Response response = null;
 try {
  response = okHttpClient.newCall(request).execute();
  int status = response.code();
  if (status == 200) {
  return response.body().string();
  }
 } catch (Exception e) {
  logger.error("okhttp post error >> ex = {}", ExceptionUtils.getStackTrace(e));
 } finally {
  if (response != null) {
  response.close();
  }
 }
 return responseBody;
 }
 
 public String postFile(String url, Map params, String fileType) {
 String responseBody = "";
 MultipartBody.Builder builder = new MultipartBody.Builder();
 //添加参数
 if (params != null && params.keySet().size() > 0) {
  for (String key : params.keySet()) {
  if (params.get(key) instanceof File) {
   File file = (File) params.get(key);
   builder.addFormDataPart(key, file.getName(), RequestBody.create(MediaType.parse(fileType), file));
   continue;
  }
  builder.addFormDataPart(key, params.get(key).toString());
  }
 }
 Request request = new Request
  .Builder()
  .url(url)
  .post(builder.build())
  .build();
 Response response = null;
 try {
  response = okHttpClient.newCall(request).execute();
  int status = response.code();
  if (status == 200) {
  return response.body().string();
  }
 } catch (Exception e) {
  logger.error("okhttp postFile error >> ex = {}", ExceptionUtils.getStackTrace(e));
 } finally {
  if (response != null) {
  response.close();
  }
 }
 return responseBody;
 }
}

使用方法

@Resource
private OkHttpUtil okHttpUtil;

总结

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