HttpClient 4.5.3（ get和post请求）

Posted 2021-02-10 heqiyoujing

版本HttpCilent 4.5.3 

1.GET请求

CloseableHttpClient httpCilent = HttpClients.createDefault();//Creates CloseableHttpClient instance with default configuration.
HttpGet httpGet = new HttpGet("http://www.baidu.com");
try {
    httpCilent.execute(httpGet);
} catch (IOException e) {
    e.printStackTrace();
}finally {
    try {
        httpCilent.close();//释放资源
    } catch (IOException e) {
        e.printStackTrace();
    }
}

2.GET请求，设置 超时时间

CloseableHttpClient httpCilent2 = HttpClients.createDefault();
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectTimeout(5000)   //设置连接超时时间
                .setConnectionRequestTimeout(5000) // 设置请求超时时间
                .setSocketTimeout(5000)
                .setRedirectsEnabled(true)//默认允许自动重定向
                .build();
        HttpGet httpGet2 = new HttpGet("http://www.baidu.com");
        httpGet2.setConfig(requestConfig);
        String srtResult = "";
        try {
            HttpResponse httpResponse = httpCilent2.execute(httpGet2);
            if(httpResponse.getStatusLine().getStatusCode() == 200){
                srtResult = EntityUtils.toString(httpResponse.getEntity());//获得返回的结果
                System.out.println(srtResult);
            }else if(httpResponse.getStatusLine().getStatusCode() == 400){
                //..........
            }else if(httpResponse.getStatusLine().getStatusCode() == 500){
                //.............
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                httpCilent2.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

3.POST请求，参数

//获取可关闭的 httpCilent
        CloseableHttpClient httpClient = HttpClients.createDefault();
        //配置超时时间
        RequestConfig requestConfig = RequestConfig.custom().
                setConnectTimeout(1000).setConnectionRequestTimeout(1000)
                .setSocketTimeout(1000).setRedirectsEnabled(true).build();
         
        HttpPost httpPost = new HttpPost("http://consentprt.dtac.co.th/webaoc/123SubscriberProcess");
        //设置超时时间
        httpPost.setConfig(requestConfig);
        //装配post请求参数
        List<BasicNameValuePair> list = new ArrayList<BasicNameValuePair>(); 
        list.add(new BasicNameValuePair("age", "20"));  //请求参数
        list.add(new BasicNameValuePair("name", "zhangsan")); //请求参数
        try {
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,"UTF-8"); 
            //设置post求情参数
            httpPost.setEntity(entity);
            HttpResponse httpResponse = httpClient.execute(httpPost);
            String strResult = "";
            if(httpResponse != null){ 
                System.out.println(httpResponse.getStatusLine().getStatusCode());
                if (httpResponse.getStatusLine().getStatusCode() == 200) {
                    strResult = EntityUtils.toString(httpResponse.getEntity());
                } else if (httpResponse.getStatusLine().getStatusCode() == 400) {
                    strResult = "Error Response: " + response.getStatusLine().toString();
                } else if (httpResponse.getStatusLine().getStatusCode() == 500) {
                    strResult = "Error Response: " + response.getStatusLine().toString();
                } else {
                    strResult = "Error Response: " + response.getStatusLine().toString();
                } 
            }else{
                 
            }
            System.out.println(strResult);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                if(httpClient != null){
                    httpClient.close(); //释放资源
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

4.Post 请求，map参数

public static String doPost(String url, Map<String, Object> paramsMap){
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);
        RequestConfig requestConfig = RequestConfig.custom().
                setConnectTimeout(180 * 1000).setConnectionRequestTimeout(180 * 1000)
                .setSocketTimeout(180 * 1000).setRedirectsEnabled(true).build();
        httpPost.setConfig(requestConfig);
         
        List<NameValuePair> nvps = new ArrayList<NameValuePair>();
        for (String key : paramsMap.keySet()) {
            nvps.add(new BasicNameValuePair(key, String.valueOf(paramsMap.get(key))));
        }
        try {
            httpPost.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8"));
            logger.info("httpPost ===**********===>>> " + EntityUtils.toString(httpPost.getEntity()));
            HttpResponse response = httpClient.execute(httpPost);
            String strResult = "";
            if (response.getStatusLine().getStatusCode() == 200) {
                 strResult = EntityUtils.toString(response.getEntity());
                 return strResult;
            } else {
                return "Error Response: " + response.getStatusLine().toString();
            }
        } catch (Exception e) {
            e.printStackTrace();
            return "post failure :caused by-->" + e.getMessage().toString();
        }finally {
            if(null != httpClient){
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

5.POST 请求，参数是json字符串

public static String doPostForJson(String url, String jsonParams){
            CloseableHttpClient httpClient = HttpClients.createDefault();
            HttpPost httpPost = new HttpPost(url);
            RequestConfig requestConfig = RequestConfig.custom().
                    setConnectTimeout(180 * 1000).setConnectionRequestTimeout(180 * 1000)
                    .setSocketTimeout(180 * 1000).setRedirectsEnabled(true).build();
             
            httpPost.setConfig(requestConfig);
            httpPost.setHeader("Content-Type","application/json");  //
            try {
                httpPost.setEntity(new StringEntity(jsonParams,ContentType.create("application/json", "utf-8")));
                System.out.println("request parameters" + EntityUtils.toString(httpPost.getEntity()));
                HttpResponse response = httpClient.execute(httpPost);
                System.out.println(" code:"+response.getStatusLine().getStatusCode());
                System.out.println("doPostForInfobipUnsub response"+response.getStatusLine().toString());
                return String.valueOf(response.getStatusLine().getStatusCode());
            } catch (Exception e) {
                e.printStackTrace();
                return "post failure :caused by-->" + e.getMessage().toString();
            }finally {
                if(null != httpClient){
                    try {
                        httpClient.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
}