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HttpServlet类的请求与响应

2016-06-04 11:52 411 查看

请求与响应一般都是表单与服务器发生交互的，可以使用接口httpServletRequest,httpServletResponse实现请求与交互，下面来看一段请求与交互的代码

首先新建一个javaweb项目，在这个项目下面新建一个servlet对象。然后新建Info.html文件，再配置web.xml文件

代码如下：1.java文件

package hzy;

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

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 studentInfo
*/
@WebServlet(description = "this is student message", urlPatterns = { "/studentInfo" })
public class studentInfo extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public studentInfo() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("gb2312");
response.setContentType("text/html;charset=gb2312");
PrintWriter out=response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>基本信息</title>");
out.println("</head>");
out.println("<body>");
out.println("<h2>学生的基本信息</h2>");
out.println("<h3>姓名:"+request.getParameter("sname")+"</h3>");
out.println("<h3>学号:"+request.getParameter("snumber")+"</h3>");
out.println("<h3>班级:"+request.getParameter("sclass")+"</h3>");
out.println("</body>");
out.println("</html>");

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}

}

2.html文件

<html>
<head>
<title></title>
</head>

<body>
<form action="studentInfo" name="myform" method="post">
姓名:<input type="text" name="sname"><br>
学号:<input type="text" name="snumber"><br>
班级:<input type="text" name="sclass"><br>
<input type="submit" value="提交">
</form>
</body>
</html>


3.xml相关代码

<?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"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>251Servlet</display-name>
<servlet>
<servlet-name>studentInfo</servlet-name>
<servlet-class>hzy.studentInfo</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>studentInfo</servlet-name>
<url-pattern>/studentInfo</url-pattern>
</servlet-mapping>
<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>
</web-app>
运行效果如下：
<img src="http://img.blog.csdn.net/20160604120340526?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />



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标签：  java web request response
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