Http请求接口的模板

旧城等待， 2023-02-19 06:30 14阅读 0赞

1.  使用Apache的HttpClient

@Controller
    public class HttpDemo {
        //接口地址
        private String url = "http://ws.webxml.com.cn/webservices/qqOnlineWebService.asmx/qqCheckOnline";
        
        //GET请求
       @RequestMapping("getInfo")
        @ResponseBody
        public String getInfo(){
            HttpClient httpClient = HttpClientBuilder.create().build();
            HttpGet httpGet = new HttpGet(url + "?qqCode=222222222");
            try {
                HttpResponse response = httpClient.execute(httpGet);
                HttpEntity entity = response.getEntity();
                return EntityUtils.toString(entity, "utf-8");
            } catch (IOException e) {
                e.printStackTrace();
            }
            return "";
        }
       //POST请求
        @RequestMapping("postInfo")
        @ResponseBody
        public String postInfo(){
            HttpClient httpClient = HttpClientBuilder.create().build();
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("qqCode","222222222"));
            UrlEncodedFormEntity entity1 = null;
            try {
                entity1 = new UrlEncodedFormEntity(params, "utf-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(entity1);
            httpPost.addHeader("Content-Type","application/x-www-form-urlencoded");
            HttpResponse response = null;
            try {
                response = httpClient.execute(httpPost);
            } catch (IOException e) {
                e.printStackTrace();
            }
            HttpEntity entity2 = response.getEntity();
            String ret = "";
            try {
                ret = EntityUtils.toString(entity2, "utf-8");
            } catch (IOException e) {
                e.printStackTrace();
            }
            return ret;
        }
    }

1.  使用JDK自带的HttpUrlConnection

@Controller
    public class HttpDemo {
       //接口地址
        private String addr = "http://ws.webxml.com.cn/webservices/qqOnlineWebService.asmx/qqCheckOnline";
        
        //GET请求
        @RequestMapping("getInfo")
        @ResponseBody
        public String getInfo() {
            URL url = null;
            try {
                url = new URL(addr + "?qqCode=347635191");
            } catch (MalformedURLException e) {
                e.printStackTrace();
            }
            HttpURLConnection connection = null;
            try {
                connection = (HttpURLConnection) url.openConnection();
            } catch (IOException e) {
                e.printStackTrace();
            }
            connection.setDoOutput(true);
            connection.setDoInput(true);
            try {
                connection.setRequestMethod("GET");
            } catch (ProtocolException e) {
                e.printStackTrace();
            }
            try {
                connection.connect();
            } catch (IOException e) {
                e.printStackTrace();
            }
            BufferedReader bf = null;
            try {
                bf = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
            } catch (IOException e) {
                e.printStackTrace();
            }
            String line;
            StringBuilder sb = new StringBuilder();
            try {
                while ((line = bf.readLine()) != null) {
                    sb.append(line).append(System.getProperty("line.separator"));
                }
            }catch (IOException e){
                e.printStackTrace();
            }
            try {
                bf.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            connection.disconnect();
            return sb.toString();
        }
        
        //POST请求
        @RequestMapping("postInfo")
        @ResponseBody
        public String postInfo(){
            Map<String,String> param = new HashMap<String,String>();
            param.put("qqCode","347635191");
            URL url = null;
            try {
                url = new URL(addr);
            } catch (MalformedURLException e) {
                e.printStackTrace();
            }
            HttpURLConnection connection = null;
            try {
                connection = (HttpURLConnection) url.openConnection();
            } catch (IOException e) {
                e.printStackTrace();
            }
            connection.setDoOutput(true);
            connection.setDoInput(true);
            try {
                connection.setRequestMethod("POST");
            } catch (ProtocolException e) {
                e.printStackTrace();
            }
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
            try {
                connection.connect();
            } catch (IOException e) {
                e.printStackTrace();
            }
            DataOutputStream dataout = null;
            try {
                dataout = new DataOutputStream(connection.getOutputStream());
            } catch (IOException e) {
                e.printStackTrace();
            }
            String paramStr =builderUrlParams(param);
            try {
                  dataout.writeBytes(paramStr);
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                dataout.flush();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                dataout.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            BufferedReader bf = null;
            try {
                bf = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
            } catch (IOException e) {
                e.printStackTrace();
            }
            String line;
            StringBuilder sb = new StringBuilder();
            try {
                while ((line = bf.readLine()) != null) {
                    sb.append(line).append(System.getProperty("line.separator"));
                }
            }catch (IOException e){
                e.printStackTrace();
            }
            try {
                bf.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            connection.disconnect();
            return sb.toString();
            }
        //构造HttpURLConnection进行Post请求所需要的参数
        public static String builderUrlParams(Map<String, String> params){
            Set<String> keySet = params.keySet();
            List<String> keyList = new ArrayList<String>(keySet);
            Collections.sort(keyList);
            StringBuilder sb = new StringBuilder();
            for (String key : keyList) {
                String value = params.get(key);
                if (StringUtils.isEmpty(value)) {
                    continue;
                }
                sb.append(key);
                sb.append("=");
                try {
                    sb.append(URLEncoder.encode(params.get(key),"UTF-8"));
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                sb.append("&");
            }
            sb.deleteCharAt(sb.length() - 1);
            return sb.toString();
        }
    }