HttpClient实战

创建Get请求

HttpGet httpGet = new HttpGet(url+param);

设置请求头信息

HttpGet httpGet = new HttpGet(url+param);
httpGet.setHeader("Token",token);
httpGet.setHeader("Timespan",time);

设置响应模型

CloseableHttpResponse response = null;

客户端发起请求：这里要处理异常，调用的是响应模型的变量

//客户端发起请求
response = httpClient.execute(httpGet);

获取实体

//从相应模型中获取实体
HttpEntity responseEntity = response.getEntity();

方法：

getContentLength() 获取响应内容长度

EntityUtils.toString(responseEntity)  获取响应内容

完整代码

 public static void main(String[] args) {/**
         * 请求头
         * @param Token 验证加密值 Md5(key+Timespan+SecretKey) 加密的32位大写字符串)
         * @param Timespan 精确到秒的Unix时间戳
         * 请求参数
         * @param key 应用APPKEY(应用详细页查询)
         * @param keyword  搜索关键字
         */
        LocalDateTime time = LocalDateTime.now();
        String Timespan = time.toString();
        String Token = MD5Util.toMD5(appkey+Timespan+secretKey);
        String url = "http://api.qichacha.com/ECIV4/SearchWide?key="+ secretKey + "keyword=零瓴软件";
// 获得Http客户端(可以理解为:你得先有一个浏览器;注意:实际上HttpClient与浏览器是不一样的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 创建Get请求
        HttpGet httpGet = new HttpGet(url);
        // 添加请求头信息
        httpGet.addHeader("Token",Token);
        httpGet.addHeader("Timespan",Timespan);
        // 响应模型
        CloseableHttpResponse response = null;
        try {
            // 由客户端执行(发送)Get请求
            response = httpClient.execute(httpGet);
            // 从响应模型中获取响应实体
            HttpEntity responseEntity = response.getEntity();
            System.out.println("响应状态为:" + response.getStatusLine());
            if (responseEntity != null) {
                System.out.println("响应内容长度为:" + responseEntity.getContentLength());
                System.out.println("响应内容为:" + EntityUtils.toString(responseEntity));
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 释放资源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

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