JAVA發(fā)送http get/post請(qǐng)求，調(diào)用http接口、方法詳解

發(fā)布時(shí)間：2020-09-25 05:59:14 來(lái)源：腳本之家閱讀：576 作者：霄永梓欄目：編程語(yǔ)言

三個(gè)例子 —JAVA發(fā)送http get/post請(qǐng)求，調(diào)用http接口、方法

例1：使用 HttpClient （commons-httpclient-3.0.jar
jar下載地址：http://xiazai.jb51.net/201904/yuanma/commons-httpclient-3.0.rar

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.InputStreamRequestEntity;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;

public class HttpTool {

 /**
  * 發(fā)送post請(qǐng)求
  * 
  * @author Michael -----CSDN: http://blog.csdn.net/capmiachael
  * @param params
  *   參數(shù)
  * @param requestUrl
  *   請(qǐng)求地址
  * @param authorization
  *   授權(quán)書(shū)
  * @return 返回結(jié)果
  * @throws IOException
  */
 public static String sendPost(String params, String requestUrl,
   String authorization) throws IOException {

  byte[] requestBytes = params.getBytes("utf-8"); // 將參數(shù)轉(zhuǎn)為二進(jìn)制流
  HttpClient httpClient = new HttpClient();// 客戶端實(shí)例化
  PostMethod postMethod = new PostMethod(requestUrl);
  //設(shè)置請(qǐng)求頭Authorization
  postMethod.setRequestHeader("Authorization", "Basic " + authorization);
  // 設(shè)置請(qǐng)求頭 Content-Type
  postMethod.setRequestHeader("Content-Type", "application/json");
  InputStream inputStream = new ByteArrayInputStream(requestBytes, 0,
    requestBytes.length);
  RequestEntity requestEntity = new InputStreamRequestEntity(inputStream,
    requestBytes.length, "application/json; charset=utf-8"); // 請(qǐng)求體
  postMethod.setRequestEntity(requestEntity);
  httpClient.executeMethod(postMethod);// 執(zhí)行請(qǐng)求
  InputStream soapResponseStream = postMethod.getResponseBodyAsStream();// 獲取返回的流
  byte[] datas = null;
  try {
   datas = readInputStream(soapResponseStream);// 從輸入流中讀取數(shù)據(jù)
  } catch (Exception e) {
   e.printStackTrace();
  }
  String result = new String(datas, "UTF-8");// 將二進(jìn)制流轉(zhuǎn)為String
  // 打印返回結(jié)果
  // System.out.println(result);

  return result;

 }

 /**
  * 從輸入流中讀取數(shù)據(jù)
  * 
  * @param inStream
  * @return
  * @throws Exception
  */
 public static byte[] readInputStream(InputStream inStream) throws Exception {
  ByteArrayOutputStream outStream = new ByteArrayOutputStream();
  byte[] buffer = new byte[1024];
  int len = 0;
  while ((len = inStream.read(buffer)) != -1) {
   outStream.write(buffer, 0, len);
  }
  byte[] data = outStream.toByteArray();
  outStream.close();
  inStream.close();
  return data;
 }
}

例2：

import java.io.BufferedReader; 
import java.io.IOException;
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException; 
import java.net.HttpURLConnection; 
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL; 
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

/** 
 * Http請(qǐng)求工具類(lèi) 
 * @author snowfigure 
 * @since 2014-8-24 13:30:56 
 * @version v1.0.1 
 */
public class HttpRequestUtil {
 static boolean proxySet = false;
 static String proxyHost = "127.0.0.1";
 static int proxyPort = 8087;
 /** 
  * 編碼 
  * @param source 
  * @return 
  */ 
 public static String urlEncode(String source,String encode) { 
  String result = source; 
  try { 
   result = java.net.URLEncoder.encode(source,encode); 
  } catch (UnsupportedEncodingException e) { 
   e.printStackTrace(); 
   return "0"; 
  } 
  return result; 
 }
 public static String urlEncodeGBK(String source) { 
  String result = source; 
  try { 
   result = java.net.URLEncoder.encode(source,"GBK"); 
  } catch (UnsupportedEncodingException e) { 
   e.printStackTrace(); 
   return "0"; 
  } 
  return result; 
 }
 /** 
  * 發(fā)起http請(qǐng)求獲取返回結(jié)果 
  * @param req_url 請(qǐng)求地址 
  * @return 
  */ 
 public static String httpRequest(String req_url) {
  StringBuffer buffer = new StringBuffer(); 
  try { 
   URL url = new URL(req_url); 
   HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection(); 

   httpUrlConn.setDoOutput(false); 
   httpUrlConn.setDoInput(true); 
   httpUrlConn.setUseCaches(false); 

   httpUrlConn.setRequestMethod("GET"); 
   httpUrlConn.connect(); 

   // 將返回的輸入流轉(zhuǎn)換成字符串 
   InputStream inputStream = httpUrlConn.getInputStream(); 
   InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8"); 
   BufferedReader bufferedReader = new BufferedReader(inputStreamReader); 

   String str = null; 
   while ((str = bufferedReader.readLine()) != null) { 
    buffer.append(str); 
   } 
   bufferedReader.close(); 
   inputStreamReader.close(); 
   // 釋放資源 
   inputStream.close(); 
   inputStream = null; 
   httpUrlConn.disconnect(); 

  } catch (Exception e) { 
   System.out.println(e.getStackTrace()); 
  } 
  return buffer.toString(); 
 } 

 /** 
  * 發(fā)送http請(qǐng)求取得返回的輸入流 
  * @param requestUrl 請(qǐng)求地址 
  * @return InputStream 
  */ 
 public static InputStream httpRequestIO(String requestUrl) { 
  InputStream inputStream = null; 
  try { 
   URL url = new URL(requestUrl); 
   HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection(); 
   httpUrlConn.setDoInput(true); 
   httpUrlConn.setRequestMethod("GET"); 
   httpUrlConn.connect(); 
   // 獲得返回的輸入流 
   inputStream = httpUrlConn.getInputStream(); 
  } catch (Exception e) { 
   e.printStackTrace(); 
  } 
  return inputStream; 
 }


 /**
  * 向指定URL發(fā)送GET方法的請(qǐng)求
  * 
  * @param url
  *   發(fā)送請(qǐng)求的URL
  * @param param
  *   請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
  * @return URL 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
  */
 public static String sendGet(String url, String param) {
  String result = "";
  BufferedReader in = null;
  try {
   String urlNameString = url + "?" + param;
   URL realUrl = new URL(urlNameString);
   // 打開(kāi)和URL之間的連接
   URLConnection connection = realUrl.openConnection();
   // 設(shè)置通用的請(qǐng)求屬性
   connection.setRequestProperty("accept", "*/*");
   connection.setRequestProperty("connection", "Keep-Alive");
   connection.setRequestProperty("user-agent",
     "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
   // 建立實(shí)際的連接
   connection.connect();
   // 獲取所有響應(yīng)頭字段
   Map<String, List<String>> map = connection.getHeaderFields();
   // 遍歷所有的響應(yīng)頭字段
   for (String key : map.keySet()) {
    System.out.println(key + "--->" + map.get(key));
   }
   // 定義 BufferedReader輸入流來(lái)讀取URL的響應(yīng)
   in = new BufferedReader(new InputStreamReader(
     connection.getInputStream()));
   String line;
   while ((line = in.readLine()) != null) {
    result += line;
   }
  } catch (Exception e) {
   System.out.println("發(fā)送GET請(qǐng)求出現(xiàn)異常！" + e);
   e.printStackTrace();
  }
  // 使用finally塊來(lái)關(guān)閉輸入流
  finally {
   try {
    if (in != null) {
     in.close();
    }
   } catch (Exception e2) {
    e2.printStackTrace();
   }
  }
  return result;
 }

 /**
  * 向指定 URL 發(fā)送POST方法的請(qǐng)求
  * 
  * @param url
  *   發(fā)送請(qǐng)求的 URL
  * @param param
  *   請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
  * @param isproxy
  *    是否使用代理模式
  * @return 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
  */
 public static String sendPost(String url, String param,boolean isproxy) {
  OutputStreamWriter out = null;
  BufferedReader in = null;
  String result = "";
  try {
   URL realUrl = new URL(url);
   HttpURLConnection conn = null;
   if(isproxy){//使用代理模式
    @SuppressWarnings("static-access")
    Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));
    conn = (HttpURLConnection) realUrl.openConnection(proxy);
   }else{
    conn = (HttpURLConnection) realUrl.openConnection();
   }
   // 打開(kāi)和URL之間的連接

   // 發(fā)送POST請(qǐng)求必須設(shè)置如下兩行
   conn.setDoOutput(true);
   conn.setDoInput(true);
   conn.setRequestMethod("POST"); // POST方法


   // 設(shè)置通用的請(qǐng)求屬性

   conn.setRequestProperty("accept", "*/*");
   conn.setRequestProperty("connection", "Keep-Alive");
   conn.setRequestProperty("user-agent",
     "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
   conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

   conn.connect();

   // 獲取URLConnection對(duì)象對(duì)應(yīng)的輸出流
   out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
   // 發(fā)送請(qǐng)求參數(shù)
   out.write(param);
   // flush輸出流的緩沖
   out.flush();
   // 定義BufferedReader輸入流來(lái)讀取URL的響應(yīng)
   in = new BufferedReader(
     new InputStreamReader(conn.getInputStream()));
   String line;
   while ((line = in.readLine()) != null) {
    result += line;
   }
  } catch (Exception e) {
   System.out.println("發(fā)送 POST 請(qǐng)求出現(xiàn)異常！"+e);
   e.printStackTrace();
  }
  //使用finally塊來(lái)關(guān)閉輸出流、輸入流
  finally{
   try{
    if(out!=null){
     out.close();
    }
    if(in!=null){
     in.close();
    }
   }
   catch(IOException ex){
    ex.printStackTrace();
   }
  }
  return result;
 } 

 public static void main(String[] args) {
  //demo:代理訪問(wèn)
  String url = "http://api.adf.ly/api.php";
  String para = "key=youkeyid&youuid=uid&advert_type=int&domain=adf.ly&url=http://somewebsite.com";

  String sr=HttpRequestUtil.sendPost(url,para,true);
  System.out.println(sr);
 }

}

例3

/**
  * 發(fā)送Http post請(qǐng)求
  * 
  * @param xmlInfo
  *   json轉(zhuǎn)化成的字符串
  * @param URL
  *   請(qǐng)求url
  * @return 返回信息
  */
 public static String doHttpPost(String xmlInfo, String URL) {
  System.out.println("發(fā)起的數(shù)據(jù):" + xmlInfo);
  byte[] xmlData = xmlInfo.getBytes();
  InputStream instr = null;
  java.io.ByteArrayOutputStream out = null;
  try {
   URL url = new URL(URL);
   URLConnection urlCon = url.openConnection();
   urlCon.setDoOutput(true);
   urlCon.setDoInput(true);
   urlCon.setUseCaches(false);
   urlCon.setRequestProperty("content-Type", "application/json");
   urlCon.setRequestProperty("charset", "utf-8");
   urlCon.setRequestProperty("Content-length",
     String.valueOf(xmlData.length));
   System.out.println(String.valueOf(xmlData.length));
   DataOutputStream printout = new DataOutputStream(
     urlCon.getOutputStream());
   printout.write(xmlData);
   printout.flush();
   printout.close();
   instr = urlCon.getInputStream();
   byte[] bis = IOUtils.toByteArray(instr);
   String ResponseString = new String(bis, "UTF-8");
   if ((ResponseString == null) || ("".equals(ResponseString.trim()))) {
    System.out.println("返回空");
   }
   System.out.println("返回?cái)?shù)據(jù)為:" + ResponseString);
   return ResponseString;

  } catch (Exception e) {
   e.printStackTrace();
   return "0";
  } finally {
   try {
    out.close();
    instr.close();

   } catch (Exception ex) {
    return "0";
   }
  }
 }

以上所述是小編給大家介紹的Java發(fā)送http get/post請(qǐng)求調(diào)用接口/方法詳解整合，希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)億速云網(wǎng)站的支持！

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