HttpClient使用

1:jar引入

       <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>4.4.6</version>
        </dependency>

2:get请求测试

void get(String url) throws IOException {
        CloseableHttpClient aDefault = HttpClients.createDefault();
        HttpGet get = new HttpGet(url);
        CloseableHttpResponse execute = aDefault.execute(get);
        int statusCode = execute.getStatusLine().getStatusCode();
        if (statusCode == 200) {
            HttpEntity entity = execute.getEntity();
            String s = EntityUtils.toString(entity, "utf-8");
            System.out.println(s);
        }
    }

void post(String url) throws IOException {
        CloseableHttpClient aDefault = HttpClients.createDefault();
        HttpPost post = new HttpPost(url);
        post.setHeader("token","111");
        List<NameValuePair> list = new ArrayList<>();
        list.add(new BasicNameValuePair("name", "cat"));
        list.add(new BasicNameValuePair("pwd", "123"));
        UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(list, "utf-8");
        post.setEntity(urlEncodedFormEntity);
        CloseableHttpResponse execute = aDefault.execute(post);
        int statusCode = execute.getStatusLine().getStatusCode();
        if (statusCode == 200) {
            HttpEntity entity = execute.getEntity();
            String s = EntityUtils.toString(entity, "utf-8");
            System.out.println(s);
        }
    }