关于Java访问一个url，不打开浏览器，后台虚拟请求问题

方法 1. java后台访问url，通过默认浏览器打开 （不建议）

  private static void browse(String url) throws Exception {
  //获取操作系统的名字 
   String osName = System.getProperty("os.name", "");
   if (osName.startsWith("Mac OS")) {
    //苹果的打开方式 
    Class fileMgr = Class.forName("com.apple.eio.FileManager"); 
    Method openURL = fileMgr.getDeclaredMethod("openURL", new Class[] { String.class }); 
    openURL.invoke(null, new Object[] { url });    
   }else if(osName.startsWith("Windows")) {
    //windows的打开方式。 
    try{
       Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + url);  
    }catch(Exception e2){ e2.printStackTrace();}
   }else{
   // Unix or Linux的打开方式 
    String[] browsers = { "firefox", "opera", "konqueror", "epiphany", "mozilla", "netscape" }; 
    String browser = null;
    for (int count = 0; count < browsers.length && browser == null; count++){
               //执行代码，在brower有值后跳出， 
      //这里是如果进程创建成功了，==0是表示正常结束。
     if (Runtime.getRuntime().exec(new String[] { "which", browsers[count] }).waitFor() == 0) { 
      browser = browsers[count]; 
     }
               if (browser == null) {
                   throw new Exception("Could not find web browser"); 
               }else{ 
                   //这个值在上面已经成功的得到了一个进程。 
                   Runtime.getRuntime().exec(new String[] { browser, url }); 
               }            
    }
   
   } 
  }

方法 2. Java后台访问url，不打开浏览器页面 ,利用URLConnection。（伪点击量 ，不推荐，存在监测方数据遗漏问题）

 public static void openURL(String url) throws MalformedURLException, IOException { 
   URL url1 = null;
   url1 = new URL(url);  
   //URLConnection conn = new URL(url).openConnection();
    URLConnection conn = url1.openConnection();
   System.out.println(url1.getAuthority());
   InputStream is = conn.getInputStream();
   is.close();

}

方法 3 . java 调用curl 命令行方式 （还有一种Java利用jni调用curl的，本人未能实现，若有大神实现，求教）

前提：安装curl工具

参考：windows：https://blog.youkuaiyun.com/qq_21126979/article/details/78690960?locationNum=10&fps=1

           linux：https://blog.youkuaiyun.com/ivan_ljf/article/details/53966655

	public static void main(String[] args) {

		String url="http://s.trafficjam.cn/......";
                //windows下curl安装目录
		String []cmds = {"D:/curl-7.61.0/I386/curl", "-i", "-w", "{StateCode:%{http_code},DNSTime:%{time_namelookup},"
				+ "WaitTime:%{time_pretransfer},TCPConnect:%{time_connect},MakeRequest:%{time_starttransfer},"
				+ "TotleTime:%{time_total}}",url};
                //Linux下curl安装目录
//		String []cmds = {"/usr/local/curl/bin/curl", "-i", "-w", "状态%{http_code};DNS时间%{time_namelookup};"
//				+ "等待时间%{time_pretransfer}TCP 连接%{time_connect};发出请求%{time_starttransfer};"
//				+ "总时间%{time_total}",url};
		ProcessBuilder pb=new ProcessBuilder(cmds);
		pb.redirectErrorStream(true);
		Process p;
		String StateCode = null;
		String reqBody=null;
		try {
			p = pb.start();
			BufferedReader br=null;
			BufferedReader isErr=null;
			String line=null;
			String strLastLine = null;
			br=new BufferedReader(new InputStreamReader(p.getInputStream()));
			while((line=br.readLine())!=null){ // 取走子进程输出流信息
					System.out.println("\t"+line);
					strLastLine=line;
					reqBody += "\t"+line;
			}
			isErr=new BufferedReader(new InputStreamReader(p.getErrorStream()));
			line=null;			
			while((line=isErr.readLine())!=null){ //取走子程序错物流信息
				System.out.println("\t"+line);
				strLastLine=line;
				reqBody += "\t"+line;
			}
			br.close();
			System.out.println("---最后一行响应-----"+strLastLine);
			System.out.println("---响应reqBody-----"+reqBody);
                        //取状态码stateCode
			try{
			JSONObject  jasonObject = JSONObject.fromObject(strLastLine);
			Map<String,Object> map = (Map<String,Object>)jasonObject;
			StateCode= map.get("StateCode").toString();
			}catch(JSONException e){
				e.printStackTrace();
			}
			System.out.println("-----StateCode--"+StateCode);
		} catch (IOException e) {
			e.printStackTrace();
		}
		if("200".equals(StateCode)){
			System.out.println("llllllllllllllllllll");
		}
//		return StateCode;
	}

参考：

https://blog.youkuaiyun.com/c315838651/article/details/72085739

https://blog.youkuaiyun.com/zhongyuan_1990/article/details/46634017