httpClient

java代码中用httpClient调用API接口,简单示例,为了以后复制粘贴
事先准备了几个PHP接口,会已json形式返回它接收到的数据.
用的jar包版本4.5.10

    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.10</version>
    </dependency>

• httpClient 发送get请求

public void httpClientGet() {
        try {
            //用这个对象执行请求
            CloseableHttpClient client = HttpClients.createDefault();
            //请求地址
            URIBuilder uriBuilder = new URIBuilder("https://zy1993.top/get.php");
            //准备参数
            ArrayList<NameValuePair> arrayList = new ArrayList<NameValuePair>();
            arrayList.add(new BasicNameValuePair("name", "zhsangSan"));
            arrayList.add(new BasicNameValuePair("age", "11"));
            //设置参数
            uriBuilder.setParameters(arrayList);
            //执行
            CloseableHttpResponse response = client.execute(
                    new HttpGet(uriBuilder.build()));
            //输出结果
            System.out.println(EntityUtils.toString(response.getEntity()));
        } catch (URISyntaxException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

结果: 图片.png

• httpClient 发送post请求

public void httpClientPost() {
        try {
            //用这个对象执行请求
            CloseableHttpClient client = HttpClients.createDefault();
            //请求地址
            URIBuilder uriBuilder = new URIBuilder("https://zy1993.top/post.php");
            //准备参数
            ArrayList<NameValuePair> arrayList = new ArrayList<NameValuePair>();
            arrayList.add(new BasicNameValuePair("name", "lisi"));
            arrayList.add(new BasicNameValuePair("age", "22"));
            //参数封装成实体
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(arrayList,"utf-8");
            //设置参数
            HttpPost httpPost = new HttpPost(uriBuilder.build());
            httpPost.setEntity(entity);
            //执行
            CloseableHttpResponse response = client.execute(httpPost);
            //输出结果
            System.out.println(EntityUtils.toString(response.getEntity()));
        } catch (URISyntaxException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

执行结果 图片.png

• httpClient 发送post请求(json数据)

public void httpClientPostJson() {  
        try {
            CloseableHttpClient client = HttpClients.createDefault();
            URIBuilder uriBuilder = new URIBuilder("https://zy1993.top/json.php");
            HttpPost httpPost = new HttpPost(uriBuilder.build());
            //准备json
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("name", "wangWu");
            jsonObject.put("age", "33");
            String jsonString = JSON.toJSONString(jsonObject);
            //准备string类型的实体
            StringEntity stringEntity = new StringEntity(jsonString, "utf-8");
            //设置实体
            httpPost.setEntity(stringEntity);
            //执行
            CloseableHttpResponse response = client.execute(httpPost);
            //输出结果
            System.out.println(EntityUtils.toString(response.getEntity())); 
        } catch (URISyntaxException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }   
    }

结果: 图片.png