使用org.apache.http.client发送get和post请求

最新推荐文章于 2025-05-28 13:59:30 发布

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最新推荐文章于 2025-05-28 13:59:30 发布

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本文详细介绍了如何使用Java的HttpClient库发送GET和POST请求。通过示例代码，读者可以学习到如何设置请求头，构建请求实体，以及如何处理响应。文章还展示了如何解析响应状态码和响应内容。

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1、GET

        //发送请求
        CloseableHttpClient httpclient = HttpClients.createDefault();
        String url = "";
        HttpGet httpget = new HttpGet(url);
       
        CloseableHttpResponse response = null;
        try {
            response = httpclient.execute(httpget);
            int code = response.getStatusLine().getStatusCode();
            if (code == HttpStatus.SC_OK) {
                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));
                }
            }
            if (response != null) {
                response.close();
            }
            httpclient.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

2、POST

        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost(url);
     
        httpPost.setHeader("Content-Type", "application/json");
        //vm是构建的body对象
        StringEntity entity = new StringEntity(JSON.toJSONString(vm),                 StandardCharsets.UTF_8);
        httpPost.setEntity(entity);
        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(httpPost);
            // 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 (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 释放资源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }