Servlet：空白屏幕
我正在使用Eclipse IDE和下面的代码在浏览器上给出空白屏幕。我不知道为什么它显示空白屏幕。有什么想法吗？ 在此先感谢。Servlet：空白屏幕
/**
* Servlet implementation class Ch1Servlet
*/
public class Ch1Servlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
PrintWriter out=response.getWriter();
Date dat=new Date();
System.out.println(dat);
out.println("<html>" + "<body>" + "<h1>Heello world</h1>" + dat + "</body>" + "</html>");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
请找到部署描述符文件。 web.xml中：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Monte</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>Ch1Servlet</display-name>
<servlet-name>Ch1Servlet</servlet-name>
<servlet-class>Ch1Servlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Ch1Servlet</servlet-name>
<url-pattern>/Ch1Servlet</url-pattern>
</servlet-mapping>
</web-app>
尝试是这样的：
package package;
/**
*
* @author
*/
public class Ch1Servlet extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
//you code here
} catch (Exception exc) {
throw new MyException(exc);
}finally{
out.close()
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*/
@Override
public String getServletInfo() {
return "Short description";
}
// </editor-fold>
}
上面的代码接受GET和POST
我写的方式与您所提到的相同，但仍然出现空白屏幕:( – User1123123 2013-02-20 19:38:12
）您有一些System.out.println（）语句。日期字符串是否打印到控制台？任何服务器错误日志？当你右键点击浏览器并选择“查看源代码”时，你是否看到任何html源代码？ – Lan 2013-02-20 21:33:53
@Surge：谢谢你的回复。没有不在控制台上显示日期。我也检查了源.Source也仅作为空白处理。 – User1123123 2013-02-21 17:22:07
请出示你的'的serlvet，mapping''url'以及如何尝试访问这个servlet。一旦完成了你的'PrintWriter'，你应该也可以调用'out.close（）'。 – 2013-02-20 19:05:26
感谢您的回复!!我已经用Deployment descripotor文件添加了我的帖子。我尝试了out.close仍然变黑屏。 – User1123123 2013-02-20 19:16:54
什么是您的请求网址？ – 2013-02-20 19:18:22