JAVA使用HTTP调用接口

httpUtil：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutionException;

public class HttpClient {

   public String post(String requestUrl, String requestPram,String accessToken){
      OutputStreamWriter outputStreamWriter  = null;
      BufferedReader bufferedReader = null;
      StringBuffer responseResult = new StringBuffer();
      HttpURLConnection httpURLConnection = null;
      try {
         URL realUrl = new URL(requestUrl);
         httpURLConnection = (HttpURLConnection) realUrl.openConnection();
         httpURLConnection.setRequestProperty("accept", "*/*");
         httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
         httpURLConnection.setRequestProperty("connection", "Keep-Alive");
         if(!accessToken.equals("")||accessToken!=null){
            httpURLConnection.setRequestProperty("access-token", accessToken);
         }
         httpURLConnection.setRequestProperty("Content-Length", String.valueOf(requestPram.length()));
         httpURLConnection.setDoOutput(true);
         httpURLConnection.setDoInput(true);
         outputStreamWriter = new OutputStreamWriter(httpURLConnection.getOutputStream(), "utf-8");
         outputStreamWriter.write(requestPram);
         outputStreamWriter.flush();
         bufferedReader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(),"utf-8"));
         String line;
         while ((line = bufferedReader.readLine()) != null) {
            responseResult.append(line);
         }
      } catch (Exception e) {
         e.printStackTrace();
      } finally {
         httpURLConnection.disconnect();
         try {
            if (outputStreamWriter != null) {
               outputStreamWriter.close();
            }
            if (bufferedReader != null) {
               bufferedReader.close();
            }
         } catch (IOException ex) {
            ex.printStackTrace();
         }

      }
      return responseResult.toString();
   }

   public String postJson(String requestUrl, String requestPram,String accessToken){
      OutputStreamWriter outputStreamWriter  = null;
      BufferedReader bufferedReader = null;
      StringBuffer responseResult = new StringBuffer();
      HttpURLConnection httpURLConnection = null;
      try {
         URL realUrl = new URL(requestUrl);
         httpURLConnection = (HttpURLConnection) realUrl.openConnection();
         httpURLConnection.setRequestProperty("accept", "*/*");
         httpURLConnection.setRequestProperty("Content-Type", "application/json");
         httpURLConnection.setRequestProperty("connection", "Keep-Alive");
         if(!accessToken.equals("")||accessToken!=null){
            httpURLConnection.setRequestProperty("access-token", accessToken);
         }
         httpURLConnection.setRequestProperty("Content-Length", String.valueOf(requestPram.length()));
         httpURLConnection.setDoOutput(true);
         httpURLConnection.setDoInput(true);
         outputStreamWriter = new OutputStreamWriter(httpURLConnection.getOutputStream(), "utf-8");
         outputStreamWriter.write(requestPram);
         outputStreamWriter.flush();
         bufferedReader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(),"utf-8"));
         String line;
         while ((line = bufferedReader.readLine()) != null) {
            responseResult.append(line);
         }
      } catch (Exception e) {
         e.printStackTrace();
      } finally {
         httpURLConnection.disconnect();
         try {
            if (outputStreamWriter != null) {
               outputStreamWriter.close();
            }
            if (bufferedReader != null) {
               bufferedReader.close();
            }
         } catch (IOException ex) {
            ex.printStackTrace();
         }

      }
      return responseResult.toString();
   }

   public String get(String url, String param) throws Exception {
      String result = "";
      BufferedReader in = null;
      try {
         String urlNameString = url + "?" + param;
         URL realUrl = new URL(urlNameString);
         // 打开和URL之间的连接
         URLConnection connection = realUrl.openConnection();
         // 设置通用的请求属性
         connection.setRequestProperty("accept", "*/*");
         connection.setRequestProperty("connection", "Keep-Alive");
         connection.setRequestProperty("user-agent",
               "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
         // 建立实际的连接
         connection.connect();
         // 获取所有响应头字段
         Map<String, List<String>> map = connection.getHeaderFields();
         // 遍历所有的响应头字段
         for (String key : map.keySet()) {
            //System.out.println(key + "--->" + map.get(key));
         }
         // 定义 BufferedReader输入流来读取URL的响应
         in = new BufferedReader(new InputStreamReader(
               connection.getInputStream()));
         String line;
         while ((line = in.readLine()) != null) {
            result += line;
         }
      }
      // 使用finally块来关闭输入流
      finally {
         try {
            if (in != null) {
               in.close();
            }
         } catch (Exception e2) {
            e2.printStackTrace();
         }
      }
      return result;
   }
}

 

使用：
postJson：

HttpClient httpClient = new HttpClient();
String param = "{\"appKey\":\""+appKey+"\"," +
        "\"signature\":\""+signature+"\"," +
        "\"time\":\""+time+"\"}";
String resJson =httpClient.postJson(url+"/api/token",param,"");
JSONObject bodyJson = (JSONObject) JSONObject.parse(resJson);

get：

String cityPram = "appKey=yongjia_pro&token="+XinLingTask.getToken();
HttpClient httpTest = new HttpClient();
String cityRes = httpTest.get(XinLingTask.url+"/addition/577/5775/api/dailyCity",cityPram);

//调用返回HTML

public static String getHTMLResourceByUrl(String url,String encoding){
    StringBuffer sb = new StringBuffer();
    URL urlObj =null;
    URLConnection openConnection =null;
    InputStreamReader isr = null;
    BufferedReader br = null;
    try {
        urlObj = new URL(url);
        openConnection = urlObj.openConnection();
        isr = new InputStreamReader(openConnection.getInputStream(),encoding);
        br = new BufferedReader(isr);
        String temp = null;
        while((temp=br.readLine())!=null){
            sb.append(temp+"\n");
        }
    } catch (MalformedURLException e) {
        log.error("error message", e);
    } catch (IOException e) {
        log.error("error message", e);
    }finally{
        try {
            if(isr !=null){
                isr.close();
            }
        } catch (IOException e) {
            log.error("error message", e);
        }
    }
    return sb.toString();
}

　　

HTTPClient调用https请求，通过基本认证用户名密码（Basic Auth）

参考：https://www.cnblogs.com/rinack/p/7568020.html

          https://blog.csdn.net/qq_27605885/article/details/79131483