09 12 07 Java web 学习笔记

来源：互联网发布：档案管理系统软件问题编辑：程序博客网时间：2024/05/16 00:27

---09 12 07---

编写一个Servlet，实际上就是编写一个实现javax.servlet.Servlet接口的类，除此之外没什么特别的。

一个简单的Servlet:
用户从浏览器输入用户名然后提交到FirstServlet，Servlet接受请求并响应用户向前台输出用户所输入的用户名

package com.cric.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class for Servlet: FirstServlet
*
*/
public class FirstServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
   static final long serialVersionUID = 1L;

    /* (non-Java-doc)
* @see javax.servlet.http.HttpServlet#HttpServlet()
*/
public FirstServlet() {
  super();
}

/* (non-Java-doc)
* @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,

IOException {
  // TODO Auto-generated method stub
  String userName=request.getParameter("userName");
  response.getWriter().write("do get:"+userName);
}

/* (non-Java-doc)
* @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,

IOException {
  // TODO Auto-generated method stub
  String userName=request.getParameter("userName");
  response.getWriter().write("do post:"+userName);
}
}

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
get
<form method="get" action="./FirstServlet">
User Name:<input name="userName" type="text"/>
<input type="submit" value="submit">
</form>
post
<form method="post" action="./FirstServlet">
User Name:<input name="userName" type="text"/>
<input type="submit" value="submit">
</form>

</body>
</html>

---这里要注意Servlet和html页面的字符编码方式，有时会有乱码。
---在这里先不说Servlet的配置，我接触Servlet是从ide工具开始的，怕说不好，所以...还是先不说吧。
以后我会认真学习，补充自己的不足，研究问题刨根问底。