JavaWeb企业实训(一)servlet检测输入为空

form表单提交与url大同小异。

Myeclipse创建servlet会自动配置web.xml

  
    This is the description of my J2EE component
    This is the display name of my J2EE component
    CheckServlet
    cn.edu.bzu.py.servlet.CheckServlet
  

  
    CheckServlet
    /servlet/CheckServlet
  

CheckServlet.java

package cn.edu.bzu.py.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CheckServlet extends HttpServlet {


	public CheckServlet() {
		super();
	}


	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}


	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

			//System.out.println("hahahha");
		//检查输入是否为空
		String name = request.getParameter("uname");
		response.setContentType("text/html;charset=utf8");
		PrintWriter out = response.getWriter();
		out.println("输入"+name);
		
		out.close();
		
	}


	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
				doGet(request, response);

	}


	public void init() throws ServletException {
		// Put your code here
	}

}

把项目部署到tomcat之后，使用下面的url访问这个Servlet

http://localhost:8080/MyJavaWeb/servlet/CheckServlet?uname=123