Servlet处理请求业务

2022/2/4 6:13:59

编程Tag： 请求处理 title import servlet response Insert javax

本文主要是介绍Servlet处理请求业务，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

Servlet核心处理业务的是service方法，重写service方法即可

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>
    <form action="TestServlet" method="post">
        <label>姓名：</label><input name="name"/><br>
        <label>性别：</label>
        <input name="sex" type="radio" value="m" checked="checked"/>男
        <input name="sex" type="radio" value="f"/>女<br>
        <input type="submit" value="提交"/>
        <br>
    </form>
    
    <a href="ResponseServlet?arg=wolf"> 请求处理</a><br>
    
    <a href="ContextServlet"> 测试servlet上下文对象</a>
</body>
</html>

package com.xzit.servlet;

import java.io.IOException;
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 ResponseServlet
 */
@WebServlet("/ResponseServlet")
public class ResponseServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
     */
    protected void service(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException {
        
        String arg = request.getParameter("arg");
        request.setAttribute("arg", arg);//将数据存储在请求作用域中
        
        /* 设置响应内容主题类型及编码格式 */
        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        
        /* 使用response对象实现页面资源的重定向 */
        response.sendRedirect("response.jsp");
    }
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>
    <%
        String mess = request.getAttribute("arg").toString();
    %>
    <%=mess %>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>
    <%
        String mess = request.getAttribute("arg").toString();
    %>
    <%=mess %>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" import="com.xzit.entity.*"%>
<!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>

    <%=application.getAttribute("shige") %>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" import="com.xzit.entity.*"%>
<!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>
    <%!
        Person per=null;
    %>
    <%
        per = (Person)request.getAttribute("person");
    %>
    用户信息：<%=per.getName()%><br>
    <%=per.getSex() %>
</body>
</html>

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>ServletApp2</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

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