java 發送http和https請求的實例

HTTP請求：

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 //處理http請求requestUrl為請求地址requestMethod請求方式，值為"GET"或"POST" public static String httpRequest(String requestUrl,String requestMethod,String outputStr){ StringBuffer buffer=null; try{ URL url=new URL(requestUrl); HttpURLConnection conn=(HttpURLConnection)url.openConnection(); conn.setDoOutput(true); conn.setDoInput(true); conn.setRequestMethod(requestMethod); conn.connect(); //往服務器端寫內容也就是發起http請求需要帶的參數if(null!=outputStr){ OutputStream os=conn.getOutputStream(); os.write(outputStr.getBytes("utf-8")); os.close(); } //讀取服務器端返回的內容InputStream is=conn.getInputStream(); InputStreamReader isr=new InputStreamReader(is,"utf-8"); BufferedReader br=new BufferedReader(isr); buffer=new StringBuffer(); String line=null; while((line=br.readLine())!=null){ buffer.append(line); } }catch(Exception e){ e.printStackTrace(); } return buffer.toString(); }

HTTPS請求：

1、https和http的區別我這裡就不介紹了，在java 中訪問https鏈接的話需要有相應的SSL證書，如果沒有就無法訪問（使用http訪問https會返回403），所以我們要先自定義一個信任管理器。實現java自帶的X509TrustManger接口，代碼：

 import java.security.cert.CertificateException; import java.security.cert.X509Certificate; import javax.net.ssl.X509TrustManager; public class MyX509TrustManager implements X509TrustManager { @Override public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException { // TODO Auto-generated method stub } @Override public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException { // TODO Auto-generated method stub } @Override public X509Certificate[] getAcceptedIssuers() { // TODO Auto-generated method stub return null; } }

2、然後我們就可以使用https請求了：

 /* * 處理https GET/POST請求* 請求地址、請求方法、參數* */ public static String httpsRequest(String requestUrl,String requestMethod,String outputStr){ StringBuffer buffer=null; try{ //創建SSLContext SSLContext sslContext=SSLContext.getInstance("SSL"); TrustManager[] tm={new MyX509TrustManager()}; //初始化sslContext.init(null, tm, new java.security.SecureRandom());; //獲取SSLSocketFactory對象SSLSocketFactory ssf=sslContext.getSocketFactory(); URL url=new URL(requestUrl); HttpsURLConnection conn=(HttpsURLConnection)url.openConnection(); conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); conn.setRequestMethod(requestMethod); //設置當前實例使用的SSLSoctetFactory conn.setSSLSocketFactory(ssf); conn.connect(); //往服務器端寫內容if(null!=outputStr){ OutputStream os=conn.getOutputStream(); os.write(outputStr.getBytes("utf-8")); os.close(); } //讀取服務器端返回的內容InputStream is=conn.getInputStream(); InputStreamReader isr=new InputStreamReader(is,"utf-8"); BufferedReader br=new BufferedReader(isr); buffer=new StringBuffer(); String line=null; while((line=br.readLine())!=null){ buffer.append(line); } }catch(Exception e){ e.printStackTrace(); } return buffer.toString(); }

以上這篇java 發送http和https請求的實例就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持武林網。