Apache HttpComponents Client详解

╰+哭是因爲堅強的太久メ 2023-10-14 16:39 44阅读 0赞

Apache HttpComponents Client（也称为HttpClient）是一个开源的Java库，用于发送HTTP请求并处理HTTP响应。它提供了一组易于使用的API，用于构建和执行HTTP请求，并处理请求和响应的各个方面，如URL处理、请求头、请求体、响应状态、响应内容等。

![006bd6c33c376dbd931962e34b418663.png][]

下面是一些关于使用Apache HttpComponents Client的常见操作：

1.  发送GET请求：

// 创建HttpClient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    
    // 创建HttpGet请求
    HttpGet httpGet = new HttpGet("http://example.com");
    
    // 执行请求
    CloseableHttpResponse response = httpClient.execute(httpGet);
    
    // 处理响应
    try {
        // 获取响应状态码
        int statusCode = response.getStatusLine().getStatusCode();
    
        // 获取响应内容
        String responseBody = EntityUtils.toString(response.getEntity());
    
        // 处理响应数据...
    } finally {
        // 关闭响应
        response.close();
    }
    
    // 关闭HttpClient
    httpClient.close();

发送POST请求：

// 创建HttpClient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    
    // 创建HttpPost请求
    HttpPost httpPost = new HttpPost("http://example.com");
    
    // 设置请求体参数
    List<NameValuePair> params = new ArrayList<>();
    params.add(new BasicNameValuePair("param1", "value1"));
    params.add(new BasicNameValuePair("param2", "value2"));
    httpPost.setEntity(new UrlEncodedFormEntity(params));
    
    // 执行请求
    CloseableHttpResponse response = httpClient.execute(httpPost);
    
    // 处理响应...
    
    // 关闭HttpClient
    httpClient.close();

设置请求头：

httpGet.addHeader("Content-Type", "application/json");
    httpPost.setHeader("Authorization", "Bearer token123");

处理文件上传：

// 创建HttpClient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    
    // 创建HttpPost请求
    HttpPost httpPost = new HttpPost("http://example.com/upload");
    
    // 创建文件
    File file = new File("path/to/file");
    
    // 创建文件上传实体
    MultipartEntityBuilder builder = MultipartEntityBuilder.create();
    builder.addBinaryBody("file", file, ContentType.DEFAULT_BINARY, file.getName());
    HttpEntity multipartEntity = builder.build();
    
    // 设置请求实体
    httpPost.setEntity(multipartEntity);
    
    // 执行请求...
    
    // 关闭HttpClient
    httpClient.close();

处理重定向：

// 创建HttpClient对象
    HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
    httpClientBuilder.setRedirectStrategy(new LaxRedirectStrategy());
    CloseableHttpClient httpClient = httpClientBuilder.build();
    
    // 执行请求...

这些只是Apache HttpComponents Client库的一些基本用法示例，它还提供了许多其他功能和配置选项，如连接池管理、代理设置、超时设置、SSL/TLS配置等，以满足更复杂的HTTP请求需求。

[006bd6c33c376dbd931962e34b418663.png]: https://img-blog.csdnimg.cn/img_convert/006bd6c33c376dbd931962e34b418663.png