okhttp3使用总结

okhttp简介

    okhttp是一个封装URL,比HttpClient更友好易用的工具.

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;

使用

1.创建OkHttpClient对象;
2.设置timeout时间,包括连接超时,读超市,写超时;
3.可选(拦截器);
4.创建RequestBody对象,即请求体;
5.创建Request对象,发送请求;
6.创建Response对象,接受响应内容;

源码链接

链接：http://pan.baidu.com/s/1miJVETa 密码：ldsc

封装的工具类

import com.alibaba.fastjson.JSON;import com.google.common.collect.Maps;import okhttp3.*;import org.apache.commons.lang3.StringUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.IOException;import java.util.Arrays;import java.util.Map;import java.util.concurrent.TimeUnit;/** * @author lcj * @version 1.0 * @description okhttp get post工具类 * @Create 2017-06-16 */public class OkHttpUtil {    private static final Logger LOGGER = LoggerFactory.getLogger(OkHttpUtil.class);    private static final OkHttpClient CLIENT;    static {        CLIENT = new OkHttpClient.Builder()                .connectTimeout(10, TimeUnit.SECONDS) //连接超时                .writeTimeout(10, TimeUnit.SECONDS) //写超时                .readTimeout(30, TimeUnit.SECONDS) //读超时                .build();    }   public enum OkHttpMethod {        POST,        PUT,        DELETE    }    /**     * get请求,支持http和https     * @param url 地址,比如: http://wwww.baidu.com     * @param params 参数,可以为null     * @param headers 请求头,可以为null     * @return     */    public static String get(String url,Map<String,Object> params,Map<String,String> headers){        //Builder对象        Request.Builder builder = new Request.Builder();        //处理参数        if(null != params && params.size() > 0){            StringBuilder stringBuilder = new StringBuilder("?");            params.forEach((k,v) -> {                stringBuilder.append(k).append("=").append(v).append("&");            });            String param = stringBuilder.toString();            url += param.substring(0,param.lastIndexOf("&"));        }        //处理请求头        if(null != headers && headers.size() > 0){            headers.forEach((k,v) -> builder.header(k,v));        }        //LOGGER.info("url:{}",url);        Request request = builder.url(url).build();        //LOGGER.info("所有的请求头: ");        //request.headers().toMultimap().forEach((k,v) -> {        //    LOGGER.info("{} : {}",k,v);        //});        //创建响应对象        try {            Response response = CLIENT.newCall(request).execute();            if(!response.isSuccessful()){                LOGGER.error("发送get请求失败,状态码:{}",response.code());                return "";            }            return response.body().string();        } catch (IOException e) {            LOGGER.error("发送get请求失败,原因:{}",e.getCause());            return "";        }    }  /**     * post,put,delete请求,支持http和https     * @param url 地址,比如: http://wwww.baidu.com     * @param params 参数,可以为null     * @param headers 请求头,可以为null     * @param okHttpMethod 请求方式     * @return     */    public static String postOrPutOrDelete(String url,Map<String,Object> params,Map<String,String> headers,OkHttpMethod okHttpMethod){        //Builder对象        Request.Builder builder = new Request.Builder();        //处理请求头        if(null != headers && headers.size() > 0){            headers.forEach((k,v) -> builder.header(k,v));        }        //处理参数        if(null != params && params.size() > 0){            RequestBody body = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), JSON.toJSONString(params));            switch (okHttpMethod){                case POST:                    builder.post(body);                    break;                case PUT:                    builder.put(body);                    break;                case DELETE:                    builder.delete(body);                    break;                default:                    builder.post(body);                    break;            }        }else {            switch (okHttpMethod){                case DELETE:                default:                    builder.delete();                    break;            }        }        //LOGGER.info("url:{}",url);        Request request = builder.url(url).build();        //LOGGER.info("所有的请求头: ");        //request.headers().toMultimap().forEach((k,v) -> {        //    LOGGER.info("{} : {}",k,v);        //});        //创建响应对象        try {            Response response = CLIENT.newCall(request).execute();            if(!response.isSuccessful()){                LOGGER.error("发送请求失败,状态码:{}",response.code());                return "";            }            return response.body().string();        } catch (IOException e) {            LOGGER.error("发送请求失败,原因:{}",e.getCause());            return "";        }    }    public static void main(String[] args) {        String url = "http://wwww.baidu.com";        Map<String,Object> params = Maps.newHashMap();        params.put("title","title");        params.put("age",23);        params.put("sex",true);        Map<String,String> headers = Maps.newHashMap();        headers.put("User-Agent","Android");        headers.put("Content-Type","application/json");        String result = get(url,params,headers);        System.out.println(result);    }}