httpclient处理http basic认证

最近工作中，需要用http请求访问一个带用户认证的接口，花了点时间了解了下，直接上代码：

private static ResponseResult doHttpPostForJsonWithAuth(String url, Map<String, String> headers,
			String json, String encoding, String username, String password) {
		HttpPost httpPost = new HttpPost(url);
		try {
			// Post请求
			if (null == headers) {
				headers = new HashMap<>();
			}
			if(headers.size() == 0) {
				headers.put("Accept", "application/json");
				headers.put("accept-charset", encoding);
				headers.put("Content-Type", "application/json; charset=UTF-8");
			}
			httpPost.setHeaders(assemblyHeader(headers));
			// 设置参数
			if (StringUtils.isNotBlank(json)) {
				httpPost.setEntity(new StringEntity(json, encoding));
			}
			//生成httpclient
			DefaultHttpClient httpClient = url.startsWith("https")
					? (DefaultHttpClient)createHttpsClient() : (DefaultHttpClient)createHttpClient();
			//处理认证
			URL netUrl = new URL(url);
			HttpHost targetHost = new HttpHost(netUrl.getHost(), netUrl.getPort(), netUrl.getProtocol());
			httpClient.getCredentialsProvider().setCredentials(new AuthScope(targetHost),
					new UsernamePasswordCredentials(username, password));
			//创建 AuthCache 对象
			AuthCache authCache = new BasicAuthCache();
			//创建 BasicScheme，并把它添加到 auth cache中
			BasicScheme basicAuth = new BasicScheme();
			authCache.put(targetHost, basicAuth);
			//把AutoCache添加到上下文中
			BasicHttpContext httpContext = new BasicHttpContext();
			httpContext.setAttribute(ClientContext.AUTH_CACHE, authCache);

			long t1 = System.currentTimeMillis();
			// 发送请求，除了httpPost外， 还需要带上host、httpContext
			HttpResponse httpresponse = httpClient.execute(targetHost, httpPost, httpContext);
			StatusLine statusLine = httpresponse.getStatusLine();
			// 获取返回数据
			HttpEntity entity = httpresponse.getEntity();
			String body = EntityUtils.toString(entity);
            EntityUtils.consumeQuietly(entity);
            long time = System.currentTimeMillis() - t1;
			logger.info("post url=" + url + ", paramters="+json+", time=" + time + " ms");
			return new ResponseResult(statusLine.getStatusCode(),statusLine.getReasonPhrase(),body);
		} catch (ParseException e) {
			throw new RuntimeException("parse error for url:" + url, e);
		} catch (UnsupportedEncodingException e) {
			throw new RuntimeException("bad encoding:" + encoding, e);
		} catch (IOException e) {
			throw new RuntimeException("error for url:" + url, e);
		}finally{
			httpPost.releaseConnection();
		}
	}

以上代码在httpclient 4.2.5版本下验证通过。 apache的httpclient有commons-httpclient与httpclient，本文代码在httpclient-4.2.5下运行无误，jar包对应的maven引入为：

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.2.5</version>
</dependency>

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