java 发送http和https请求的实例

http请求：

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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：

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。