java 发送http和https请求的实例

//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(); 
  } 

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; 
  } 
} 

/* 
 * 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(); 
}