java中httpclient封装post请求和get的请求实例

下面是“java中httpclient封装post请求和get的请求实例”的完整攻略：

一、介绍httpclient

HttpClient是Apache Jakarta Common下的子项目，用来提供高效的、最新的、功能丰富的支持HTTP协议的客户端编程工具包，并且它支持HTTP协议最新的版本和建议，比如1.1和RFC2616。HttpClient实现了所有HTTP方法（GET、POST、PUT、DELETE、HEAD、OPTIONS等），还支持HTTPS（基于SSL协议）。

HttpClient连接管理的机制及连接池功能都是Apache httpclient独有的功能。

二、httpclient封装get请求实例

/**
 * HttpClient 进行 GET 请求
 */
public static String doGet(String url, Map<String, String> headers) throws Exception {

    //创建httpClient实例，获取HttpClient对象
    CloseableHttpClient httpClient = HttpClientBuilder.create().build();

    try {
        //创建httpGET请求
        HttpGet httpGet = new HttpGet(url);

        //设置headers
        setHeader(headers, httpGet);

        //执行http GET请求
        CloseableHttpResponse httpResponse = httpClient.execute(httpGet);

        try {
            //获取响应内容
            HttpEntity entity = httpResponse.getEntity();

            //将响应内容转换成String类型
            String responseBody = EntityUtils.toString(entity, Charset.forName("UTF-8"));

            //打印响应内容
            System.out.println("responseBody: " + responseBody);

            return responseBody;
        } finally {
            //释放连接
            httpResponse.close();
        }
    } finally {
        //关闭httpClient
        httpClient.close();
    }
}

private static void setHeader(Map<String, String> headers, HttpRequestBase httpRequestBase) {
    if (headers == null || headers.isEmpty()) {
        return;
    }

    for (Map.Entry<String, String> entry : headers.entrySet()) {
        httpRequestBase.setHeader(entry.getKey(), entry.getValue());
    }
}

三、httpclient封装post请求实例

/**
 * httpClient 进行 POST 请求
 */
public static String doPost(String url, Map<String, String> headers, Map<String, String> params) throws Exception {

    //创建httpClient实例，获取HttpClient对象
    CloseableHttpClient httpClient = HttpClientBuilder.create().build();

    try {
        //创建httpPost请求
        HttpPost httpPost = new HttpPost(url);

        //设置headers
        setHeader(headers, httpPost);

        //设置参数
        setParams(params, httpPost);

        //执行http Post请求
        CloseableHttpResponse httpResponse = httpClient.execute(httpPost);

        try {
            //获取响应内容
            HttpEntity entity = httpResponse.getEntity();

            //将响应内容转换成String类型
            String responseBody = EntityUtils.toString(entity, Charset.forName("UTF-8"));

            //打印响应内容
            System.out.println("responseBody: " + responseBody);

            return responseBody;
        } finally {
            //释放连接
            httpResponse.close();
        }
    } finally {
        //关闭httpClient
        httpClient.close();
    }
}

private static void setParams(Map<String, String> params, HttpPost httpPost) throws UnsupportedEncodingException {
    if (params == null || params.isEmpty()) {
        return;
    }

    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
    for (Map.Entry<String, String> entry : params.entrySet()) {
        nameValuePairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
    }

    httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
}

以上就是我对“java中httpclient封装post请求和get的请求实例”的完整攻略，希望能对您有所帮助。

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