如何在java中发起http和https请求

http://blog.csdn.net/guozili1/article/details/53995121

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package com.vagun.test;


import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.X509TrustManager;


import com.sun.net.ssl.TrustManager;


public class MyX509TrustManager implements X509TrustManager, TrustManager {


@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;
}


}

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package com.vagun.test;


import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;


import javax.net.ssl.HttpsURLConnection;


import com.sun.net.ssl.SSLContext;
 
public class Okhttp {
/*
* 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");
com.sun.net.ssl.TrustManager[] tm={new MyX509TrustManager()};
//初始化
sslContext.init(null, tm, new java.security.SecureRandom());;
//获取SSLSocketFactory对象
javax.net.ssl.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();
}
public static void main(String[] args) {
 String s=Okhttp.httpsRequest("https://openpay.meituan.com/api/common/bank/all","GET",null);  
       System.out.println(s);  
}
}