java 发送http和https请求的实例

时间:2022-10-09 10:25:57

HTTP请求:

如果需要Json格式的自己转下,度娘上N种姿势…

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//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:

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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:

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/*
 * 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服务器之家。

原文链接:http://blog.csdn.net/qq_33583322/article/details/78600670