从Java prgram在Servlet中执行doGet
[英]Execute doGet in Servlet from java prgram
问题描述
I try execute method doGet (just show popup) in servlet from java program. 
我尝试从Java程序的servlet中执行doGet方法（只是显示弹出窗口）。
Code in java program: Java程序中的代码：
URL url = new URL( "http://localhost:9999/xxx/screen?msg=VVU6" );
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
line = in.readLine();
System.out.println( line );
in.close();
Code in doGet: doGet中的代码：
PrintWriter out = response.getWriter();
out.println("<script type='text/javascript'>");
out.println("alert('peek-a-boo');");
out.println("</script>");
But, when run it not show popup alert, it just print data in console. 但是，运行时它不显示弹出警报，它只是在控制台中打印数据。
May you help me in this case ? 在这种情况下，你能帮我吗？
Thanks all! 谢谢大家！
3 个解决方案
解决方案1
0 2017-10-13 09:34:02
您可以使用Selenium Web驱动程序与来自Java代码的URL进行交互： http : //www.seleniumhq.org/docs/03_webdriver.jsp
解决方案2
0 2017-10-13 09:39:37
The code you have written in doGet writes the markup you have written to the outputstream . 您在doGet中编写的代码会将您编写的标记写入到outputstream 。 When the URL mapped to the servlet is hit from a web browser or a browser equivalent(web drivers or in-memory browsers for example), it will be rendered as a html markup . 当从Web浏览器或等效的浏览器（例如，Web驱动程序或内存浏览器）中命中映射到servlet的URL时，它将呈现为html markup 。
Read the basics of J2EE servlet and JSP to get a clear understanding of the usage and use case. 阅读J2EE servlet和JSP的基础知识，以清楚地了解其用法和用例。 A console cannot be used to generate popups. 控制台不能用于生成弹出窗口。
解决方案3
0 2017-10-13 09:45:59
pre-condition : your Servlet is running in a Servlet Container (Jetty, Tomcat) at http://localhost:9999/xxx 前提条件 ：您的Servlet在http：// localhost：9999 / xxx的Servlet容器（Jetty，Tomcat）中运行
If your routing is correct, (you access the doGet method in your Servlet by pointing your browser at http://localhost:9999/xxx/screen ) you should be able to see the alert with: 如果路由正确（通过将浏览器指向http：// localhost：9999 / xxx / screen来访问Servlet中的doGet方法），则应该可以看到警报：
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><head></head><body>");
out.println("<script>alert('peek-a-boo');</script>");
out.println("</body></html>");
If you wanna perform the GET from a JavaSE program please give a look to any small REST Client library like Unirest to be up to speed quickly. 如果要从JavaSE程序执行GET，请查看Unirest等任何小型REST客户端库，以加快速度。
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