httpClient的简单用法

最新推荐文章于 2025-04-01 09:44:12 发布

原创最新推荐文章于 2025-04-01 09:44:12 发布

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本文介绍如何利用Apache HttpClient库实现GET与POST请求的方法。包括创建HttpClient实例、配置请求参数、执行请求并处理响应结果等步骤。适用于需要通过Java发起HTTP请求的应用场景。

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public class HttpClientResponseResult {
    private int statusCode; //httpClient请求返回的状态码。0：失败；1：成功
    private String responseContent; //httpClient请求返回成功或失败的内容
    public int getStatusCode() {
        return statusCode;
    }
    public void setStatusCode(int statusCode) {
        this.statusCode = statusCode;
    }
    public String getResponseContent() {
        return responseContent;
    }
    public void setResponseContent(String responseContent) {
        this.responseContent = responseContent;
    }

}

public class HttpClientUtil {
/**
     * 进行模拟GET请求方法
     * @paramurl
     * @return
     */
    public static HttpClientResponseResult requestGet(String url){
        HttpClientResponseResult responseResult = new HttpClientResponseResult();
        //生成HttpClinet对象并设置参数
        CloseableHttpClient httpClient = HttpClients.createDefault();
        //生成HttpGet对象并设置参数
        HttpGet httpGet = new HttpGet(url);
        //设置httpGet请求超时为 5 秒
        RequestConfig requestConfig = RequestConfig.custom()
                .setSocketTimeout(5000).setConnectTimeout(5000).build();
        httpGet.setConfig(requestConfig);

        // 定义返回对象
        String jsonStr = "";
        //执行 HTTP GET 请求
        try {
            CloseableHttpResponse httpResponse = httpClient.execute(httpGet);
            //获取响应编码
            int statusCode = httpResponse.getStatusLine().getStatusCode();
            responseResult.setStatusCode(statusCode);
            //解析响应内容
            HttpEntity httpEntity = httpResponse.getEntity();
            jsonStr = EntityUtils.toString(httpEntity,"UTF-8");
            responseResult.setResponseContent(jsonStr);
        } catch (IOException e) {
            //发生网络异常

        } finally {
            //释放连接
            httpGet.releaseConnection();
            try {
                httpClient.close();
            } catch (IOException e) {

            }
        }
        return responseResult;
    }
/**
     * 进行模拟POST请求方法
     * @paramurl
     * @paramparams
     * @return
     */
    public static HttpClientResponseResult requestPost(String url, Map<String,String> paramMap){
    if(paramMap==null)
            return null;
        HttpClientResponseResult responseResult = new HttpClientResponseResult();
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);
        String jsonStr = "";
        HttpEntity entity = null;  
        try {
            entity = new StringEntity(new Gson().toJson(paramMap),ContentType.APPLICATION_JSON);//new UrlEncodedFormEntity(params, "UTF-8");
            httpPost.setEntity(entity);
            CloseableHttpResponse httpResponse = null;
            httpResponse = httpClient.execute(httpPost); 
            int statusCode = httpResponse.getStatusLine().getStatusCode();
            responseResult.setStatusCode(statusCode);
            HttpEntity httpEntity = httpResponse.getEntity();
            if (httpEntity != null) {  
                jsonStr = EntityUtils.toString(httpEntity,"UTF-8");
                responseResult.setResponseContent(jsonStr);
            } 
        } catch (IOException e) {
        }finally{
            httpPost.releaseConnection();
            try {
                httpClient.close();
            } catch (IOException e) {
            }
        }
        return responseResult;
}





















}