Servlet程序开发之表单

梦里梦外; 2022-03-22 01:44 189阅读 0赞

由于Servlet本身也存在HttpServletRquest和HttpServletResponse对象的声明，所以也可以使用Servlet接收用户所提交的内容

定义表单—input.html

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Servlet与表单</title>
    </head>
    <body>
    	<form action="InputServlet" method="post">
    		请输入内容：<input type="text" name="info"/>
    		<input type="submit" value="提交"/>
    	</form>
    </body>
    </html>

接收用户请求—InputServlet.java

package com.jmi.servletdemo;
    
    import java.io.*;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /** * Servlet implementation class InputServlet */
    @WebServlet("/InputServlet")//若是配置web.xml 文件，配置的url-pattern不能与这个地址"/InputServlet"重复
    public class InputServlet extends HttpServlet { 
    	private static final long serialVersionUID = 1L;
           
        /** * @see HttpServlet#HttpServlet() */
        public InputServlet() { 
            super();
            // TODO Auto-generated constructor stub
        }
    
    	/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    		// TODO Auto-generated method stub
    		response.setHeader("Content-Type", "text/html;charset=UTF-8");//设置UTF-8的显示页面的类型和字符集
    	    request.setCharacterEncoding("utf-8"); //设置通过post方法进行传参的字符集
    		PrintWriter out = response.getWriter() ;
    		String info = request.getParameter("info");//假设参数名称为info
    		out.println("<html>") ;
    		out.println("<head><title>ZWK</title></head>") ;
    		out.println("<body>") ;
    		out.println("<h1>" + info + "</h1>") ;
    		out.println("</body>") ;
    		out.println("</html>") ;
    		out.close() ;
    	}
    
    	/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    		// TODO Auto-generated method stub
    		doGet(request, response);//此方法是用来处理post提交
    	}
    
    }

在进行程序处理的时候一定要注意HTTP的提交方式，用的最多的就是两个：doGet()、doPost()。一定要多注意路径的问题，部分地方已作出注解，若有任何疑问或是不解请在下方评论，谢谢。