HTTP请求：

如果需要Json格式的自己转下，度娘上N种姿势…

//处理http请求 requestUrl为请求地址 requestMethod请求方式，值为"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(); //往服务器端写内容 也就是发起http请求需要带的参数 if(null!=outputStr){ OutputStream os=conn.getOutputStream(); os.write(outputStr.getBytes("utf-8")); os.close(); } //读取服务器端返回的内容 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请求：

1、https和http的区别我这里就不介绍了，在java 中访问https链接的话需要有相应的SSL证书，如果没有就无法访问（使用http访问https会返回403），所以我们要先自定义一个信任管理器。实现java自带的X509TrustManger接口，代码：

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、然后我们就可以使用https请求了：

/* * 处理https GET/POST请求 * 请求地址、请求方法、参数 * */ public static String httpsRequest(String requestUrl,String requestMethod,String outputStr){ StringBuffer buffer=null; try{ //创建SSLContext SSLContext sslContext=SSLContext.getInstance("SSL"); TrustManager[] tm={new MyX509TrustManager()}; //初始化 sslContext.init(null, tm, new java.security.SecureRandom());; //获取SSLSocketFactory对象 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); //设置当前实例使用的SSLSoctetFactory conn.setSSLSocketFactory(ssf); conn.connect(); //往服务器端写内容 if(null!=outputStr){ OutputStream os=conn.getOutputStream(); os.write(outputStr.getBytes("utf-8")); os.close(); } //读取服务器端返回的内容 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(); }

以上这篇java 发送http和https请求的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。