java httpclient接口自动化

环境准备：

idea 在pom文件中引入依赖包

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.2</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.4.4</version>
        </dependency>

先初始化一些参数和实例

String url；  //请求地址
CloseableHttpClient httpClient; //用来发送http请求的HttpClient实例
CloseableHttpResponse httpResponse; //用来接受响应信息的实例
String responseBody; //存储响应主体

创建get请求：

//创建一个httpClient的实例　　
httpClient = HttpClients.createDefault();　　
//创建一个httpGet请求实例
HttpGet httpGet = new HttpGet(url);　　
//使用httpClient实例发送刚创建的get请求，并用httpResponse将反馈接收
httpResponse = httpClient.execute(httpGet);
//处理响应
HttpEntity entity = httpResponse.getEntity();

responseBody = EntityUtils.toString(entity,"tuf-8");

创建post请求：

//创建一个httpClient的实例　　
httpClient = HttpClients.createDefault();　　
//创建一个httpGet请求实例
HttpPost httpPost = new HttpPost(url);　　
//添加参数params
Map<String, String> params = new HashMap<String, String>();
        params.put("username","ceshi1");
        params.put("password","123456");
        List<NameValuePair> formParams = new ArrayList<NameValuePair>(); //创建参数队列
        for (Map.Entry<String, String> entry : params.entrySet()) {
            formParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
        }
        post.setEntity(new UrlEncodedFormEntity(formParams, "utf-8"));
//使用httpClient实例发送刚创建的get请求，并用httpResponse将反馈接收
httpResponse = httpClient.execute(httpPost);
//处理响应
HttpEntity entity = httpResponse.getEntity();
responseBody = EntityUtils.toString(entity,"utf-8");