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  • HttpClient 4.5.3 get和post请求

    HttpCilent 4.5.3 

    GET请求

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    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();
        }
    }

    　GET　设置 超时时间

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    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();
                }
            }

    　　POST请求

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    //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();
                }
            }

    　　Post 请求

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    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();
                    }
                }
            }
        }

    　　

    POST 请求，参数是json字符串

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    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();
                        }
                    }
                }
    }

    　　

    　　

    　　
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  • 原文地址：https://www.cnblogs.com/jpfss/p/9083465.html
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