HTTP调用工具类（基于OkHttp4.x）

http调用工具类（基于OkHttp4.x）

import manage.constant.ContentType;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import okhttp3.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Map;

/**
 * http调用工具
 *
 * @author xiaoxiong
 */
public class HttpUtil {
    private static final Logger LOG = LoggerFactory.getLogger(HttpUtil.class);
    private static final OkHttpClient CLIENT = new OkHttpClient.Builder().build();
    private static final ObjectMapper MAPPER = new ObjectMapper();

    public static ResponseBody get(String url, Map<String, String> headersMap) {
        if (url == null || "".equals(url.trim())) {
            throw new RuntimeException("url is empty!");
        }

        Request.Builder builder = new Request.Builder();

        // 是否需要添加头部
        if (headersMap != null && !headersMap.isEmpty()) {
            builder = builder.headers(Headers.of(headersMap));
        }

        Request request = builder.url(url).get().build();
        try {
            return CLIENT.newCall(request).execute().body();
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }
    }

    public static ResponseBody get(String url) {
        return get(url, null);
    }

    public static String getToString(String url) {
        return toJsonString(get(url, null));
    }

    public static ResponseBody post(String contentType, String url, Map<String, String> headersMap, Map<String, Object> params) {
        MediaType mediaType;
        if (contentType == null) {
            mediaType = MediaType.get(ContentType.APPLICATION_JSON);
        } else {
            mediaType = MediaType.get(contentType);
        }
        RequestBody requestBody = RequestBody.create(params.toString(), mediaType);
        Request.Builder builder = new Request.Builder();
        if (headersMap != null && !headersMap.isEmpty()) {
            builder.headers(Headers.of(headersMap));
        }
        Request request = builder.url(url).post(requestBody).build();
        try {
            return CLIENT.newCall(request).execute().body();
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }
    }

    public static ResponseBody post(String contentType, String url, Map<String, Object> params) {
        return post(contentType, url, null, params);
    }

    public static ResponseBody post(String url, Map<String, Object> params) {
        return post(null, url, params);
    }

    public static String postToString(String contentType, String url, Map<String, Object> params) {
        return toJsonString(post(contentType, url, null, params));
    }

    public static String postToString(String url, Map<String, Object> params) {
        return toJsonString(post(null, url, params));
    }

    private static String toJsonString(Object object) {
        if (object == null) {
            LOG.warn("object is null");
            return "{}";
        }

        try {
            return MAPPER.writeValueAsString(object);
        } catch (JsonProcessingException e) {
            LOG.warn("JSON transformation error");
        }
        return null;
    }
}

Http的content type

/**
 * http调用媒体类型
 *
 * @author xiaoxiong
 */
public class ContentType {
    public static final String APPLICATION_X_WWW_FORM_URLENCODED = "application/x-www-form-urlencoded;charset=UTF-8";
    public static final String APPLICATION_JSON = "application/json;charset=UTF-8";
    public static final String MULTIPART_FORM_DATA = "multipart/form-data;charset=UTF-8";
    public static final String TEXT_XML = "text/xml;charset=UTF-8";
}