okhttp简单封装

之前一直用的是httpclient，今天okhttp简单封装了一下，主要有三个方法

1. 发送get请求
2. 发送post请求，请求体是json字符串
3. 发送post请求，可以什么都不传，可以是简单的表单提交，也可以是带文件上传的表单提交

post上传文件需要的实体

/**
 * form表单提交文件上传的文件对象
 *
 * @author chenggaowei Created on 2018-05-09 23:30
 **/
@Getter
@Setter
@ToString
public class PostFile {

  /**
   * 要上传的文件
   */
  private File file;
  /**
   * 表单对应的名称
   */
  private String formName;

  public PostFile(File file, String formName) {
    this.file = file;
    this.formName = formName;
  }
}

封装的工具类

/**
 * OkHttp工具类
 *
 * @author chenggaowei Created on 2018-05-09 23:45
 **/
public class OkHttpUtil {

  private static final MediaType JSON_TYPE = MediaType.parse("application/json; charset=utf-8");
  private static final String USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36";
  private static final OkHttpClient CLIENT;

  static {
    CLIENT = new OkHttpClient.Builder().addInterceptor(chain -> {
      Request request = chain.request().newBuilder()
          .addHeader("User-Agent", USER_AGENT)
          .addHeader("Connection", "keep-alive")
          .addHeader("Accept", "*/*")
          .build();
      return chain.proceed(request);
    })
        .connectTimeout(5, TimeUnit.SECONDS) //连接超时
        .writeTimeout(10, TimeUnit.SECONDS) //写超时
        .readTimeout(10, TimeUnit.SECONDS) //读超时
        .build();
  }

  /**
   * get请求，参数一般都在url里
   */
  public static String sendGet(String url) throws IOException {
    Request request = new Request.Builder().url(url).build();
    Response response = CLIENT.newCall(request).execute();
    return response.body().string();
  }

  /**
   * post提交json
   *
   * @param url 地址
   * @param jsonStr json字符串
   */
  public static String sendPost(String url, String jsonStr) throws IOException {
    RequestBody body = RequestBody.create(JSON_TYPE, jsonStr);
    Request request = new Request.Builder().url(url).post(body).build();
    Response response = CLIENT.newCall(request).execute();
    return response.body().string();
  }

  /**
   * post提交表单
   *
   * @param url 地址
   * @param params 参数
   * @param files 文件
   */
  public static String sendPost(String url, Map<String, Object> params, List<PostFile> files)
      throws IOException {
    if (CollectionUtils.isEmpty(files)) { // 没有文件上传的
      FormBody.Builder requestBody = new FormBody.Builder();
      if (MapUtils.isNotEmpty(params)) {
        params.forEach((k, v) -> requestBody.add(k, v.toString()));
      }
      FormBody body = requestBody.build();
      Request request = new Request.Builder().url(url).post(body).build();
      Response response = CLIENT.newCall(request).execute();
      return response.body().string();
    } else { // 有文件上传的
      MultipartBody.Builder requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM);
      if (MapUtils.isNotEmpty(params)) {
        params.forEach((k, v) -> requestBody.addFormDataPart(k, v.toString()));
      }
      if (CollectionUtils.isNotEmpty(files)) {
        for (PostFile postFile : files) {
          if (null != postFile.getFile()) {
            Path path = Paths.get(postFile.getFile().getName());
            String contentType = Files.probeContentType(path);
            if (StringUtils.isEmpty(contentType)) {
              contentType = "application/octet-stream";
            }
            RequestBody body = RequestBody.create(MediaType.parse(contentType), postFile.getFile());
            requestBody.addFormDataPart(postFile.getFormName(), postFile.getFile().getName(), body);
          }
        }
      }
      Request request = new Request.Builder().url(url).post(requestBody.build()).build();
      Response response = CLIENT.newCall(request).execute();
      return response.body().string();
    }
  }

}

如果需要在请求头携带参数类似自定义Header这种，这个时候需要把Builder封装一下

这个也可以封装成类似于PostFile这种数组

private static Builder getBuilder(String url, String header) {
    Builder builder = new Builder().url(url);
    if (StringUtils.isNotEmpty(token)) {
      builder.addHeader("header", header);
    }
    return builder;
  }

调用的地方以get和post为例

    /**
     * get请求，参数一般都在url里
     */
    public static String sendGet(String url, String header) throws IOException {
        Request request = getBuilder(url, header).build();
        Response response = CLIENT.newCall(request).execute();
        return response.body().string();
    }

    /**
     * post提交json
     *
     * @param url 地址
     * @param jsonStr json字符串
     */
    public static String sendPost(String url, String header, String jsonStr) throws IOException {
        RequestBody body = RequestBody.create(JSON_TYPE, jsonStr);
        Request request = getBuilder(url, header).post(body).build();
        Response response = CLIENT.newCall(request).execute();
        return response.body().string();
    }