apache http client 与 okhttp 使用

apache http升级经常做不兼容修改，这个使用起来有点蛋疼
okhttp升级到3.0以后与2.X版本也是做了不兼容修改，有点蛋疼

apache httpClient组件由于用的比较早，自己有比较好的封装使用起来也很简单; apache httpClient 对Cooke已经有很好的处理，访问同一个网站的URL，可以进行很好的Cookie传递；apache对返回Response流也进行了很好的预处理，比如gzip流的解压。

okhttp使用优点

okhttp 的api使用起来就，就像在进行http对话，创建一个httpClient后提供request,后处理response,代码层级清晰理解简单；okhttp对cookie管理还需要自己使实现；response的gzip需自己解压； 

okhttp3变化

com.squareup.okhttp.* 改成了 okhttp3
okhttp3 增加Builder类 
比如OkHttpClient MultipartBuilder 被替换成 FormBody.Builder 使用起来更加方便
FormEncodingBuilder 被替换成 FormBody.Builder 使用起来更加方便
Cookie处理方式有修改

okhttp 初始化变更

OkHttpClient client = new OkHttpClient();
client.setReadTimeout(10, TimeUnit.SECONDS);
client.setConnectTimeout(10, TimeUnit.SECONDS);
client.setFollowRedirects(true);

OkHttpClient.Builder builder = new OkHttpClient.Builder();
builder.readTimeout(10, TimeUnit.SECONDS);
builder.connectTimeout(10, TimeUnit.SECONDS);
builder.followRedirects(true);
return builder.build();

FormEncodingBuilder 被替换成 FormBody.Builder 使用起来更加方便

//已经删除

FormEncodingBuilder builder = new FormEncodingBuilder();
for (MucangNameValuePair pair : list) {
    builder.add(pair.getName(), pair.getValue());
}

FormBody.Builder builder = new FormBody.Builder();
for (MucangNameValuePair pair : list) {
    builder.add(pair.getName(), pair.getValue());
}

Cookie处理方式有修改

cookie okhttp2 

client.setCookieHandler(new CookieHandler() {
            @Override
            public Map> get(URI uri, Map> requestHeaders) throws IOException {
                return null;
            }

            @Override
            public void put(URI uri, Map> responseHeaders) throws IOException {

            }
        });

cookie okhttp3

builder.cookieJar(new CookieJar() {
    @Override
    public void saveFromResponse(HttpUrl url, List cookies) {
        
    }

    @Override
    public List loadForRequest(HttpUrl url) {
        return null;
    }
})

//可以对 Method 与 HttpRequestBase再做简单的封装就可以处理任意类型的请求 如：put、delete
public static String httpPost(String url, HttpEntity entity, List
 headers) {
    RequestConfig requestConfig = RequestConfig.custom()
            .setConnectTimeout(80000)
            .setSocketTimeout(80000)
            .build();
    try (CloseableHttpClient httpClient = HttpClientBuilder
            .create()
            .setDefaultRequestConfig(requestConfig)
            .build()) {
        HttpPost httpPost = new HttpPost(url);
        if (CollectionUtils.isNotEmpty(headers)) {
            for (Header header : headers) {
                httpPost.addHeader(header);
            }
        }
        httpPost.setEntity(entity);
        HttpResponse response = httpClient.execute(httpPost);
        return EntityUtils.toString(response.getEntity(), "UTF-8");
    } catch (Exception ex) {
        LOG.error(null, ex);
    }
    return null;
}


public static  T httpGet(String url, List
 headers, ResponseHandler handler) {
    RequestConfig requestConfig = RequestConfig.custom()
            .setConnectTimeout(8000)
            .setSocketTimeout(8000)
            .build();
    try (CloseableHttpClient httpClient = HttpClientBuilder
            .create()
            .setDefaultRequestConfig(requestConfig)
            .build()) {
        HttpGet httpGet = new HttpGet(url);
        if (CollectionUtils.isNotEmpty(headers)) {
            for (Header header : headers) {
                httpGet.addHeader(header);
            }
        }
        HttpResponse response = httpClient.execute(httpGet);
        return handler.handler(response);
    } catch (Exception ex) {
        LOG.error(null, ex);
    }
    return null;
}

public static interface ResponseHandler {

     T handler(HttpResponse response) throws Exception;
}

apache 官方文档： http://hc.apache.org/

okhttp 官方文档： http://square.github.io/okhttp/#overview