Servlet开发实战——配置文件实现

短命女 2021-07-24 15:17 336阅读 0赞

**一 视图**

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <!DOCtype html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title> 收集参数的表单页 </title>
        <meta name="website" content="http://www.crazyit.org" />
    </head>
    <body>
    <form id="form1" method="post" action="aa">
    用户名：<br/>
    <input type="text" name="name"><hr/>
    性别：<br/>
    男：<input type="radio" name="gender" value="男">
    女：<input type="radio" name="gender" value="女"><hr/>
    喜欢的颜色：<br/>
    红：<input type="checkbox" name="color" value="红">
    绿：<input type="checkbox" name="color" value="绿">
    蓝：<input type="checkbox" name="color" value="蓝"><hr/>
    来自的国家：<br/>
    <select name="country">
        <option value="中国">中国</option>
        <option value="美国">美国</option>
        <option value="俄罗斯">俄罗斯</option>
    </select><hr/>
    <input type="submit" value="提交">
    <input type="reset" value="重置">
    </form>
    </body>
    </html>

**二 控制器**

package lee;
    
    import javax.servlet.*;
    import javax.servlet.http.*;
    import javax.servlet.annotation.*;
    
    import java.io.*;
    
    
    // Servlet必须继承HttpServlet类
    public class FirstServlet extends HttpServlet
    {
        // 客户端的响应方法，使用该方法可以响应客户端所有类型的请求
        public void service(HttpServletRequest request,
            HttpServletResponse response)
            throws ServletException,java.io.IOException
        {
            // 设置解码方式
            request.setCharacterEncoding("GBK");
            response.setContentType("text/html;charSet=GBK");
            // 获取name的请求参数值
            String name = request.getParameter("name");
            // 获取gender的请求参数值
            String gender = request.getParameter("gender");
            // 获取color的请求参数值
            String[] color = request.getParameterValues("color");
            // 获取country的请求参数值
            String national = request.getParameter("country");
            // 获取页面输出流
            PrintStream out = new PrintStream(response.getOutputStream());
            //输出HTML页面标签
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet测试</title>");
            out.println("</head>");
            out.println("<body>");
            // 输出请求参数的值：name
            out.println("您的名字：" + name + "<hr/>");
            // 输出请求参数的值：gender
            out.println("您的性别：" + gender + "<hr/>");
            // 输出请求参数的值：color
            out.println("您喜欢的颜色：");
            for(String c : color)
            {
                out.println(c + " ");
            }
            out.println("<hr/>");
            out.println("您喜欢的颜色：");
            // 输出请求参数的值：national
            out.println("您来自的国家：" + national + "<hr/>");
            out.println("</body>");
            out.println("</html>");
        }
    }

**三 配置文件**

<?xml version="1.0" encoding="GBK"?>
    <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
        http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
        version="3.1">
    
        
        <servlet>
            
            <servlet-name>firstServlet</servlet-name>
            
            <servlet-class>lee.FirstServlet</servlet-class>
        </servlet>
        
        <servlet-mapping>
            
            <servlet-name>firstServlet</servlet-name>
            
            <url-pattern>/aa</url-pattern>
        </servlet-mapping>
    
        <servlet>
            
            <servlet-name>timerServlet</servlet-name>
            
            <servlet-class>lee.TimerServlet</servlet-class>
            
            <load-on-startup>1</load-on-startup>
        </servlet>
    
        <servlet>
            
            <servlet-name>testServlet</servlet-name>
            
            <servlet-class>lee.TestServlet</servlet-class>
            
            <init-param>
                <param-name>driver</param-name>
                <param-value>com.mysql.jdbc.Driver</param-value>
            </init-param>
            
            <init-param>
                <param-name>url</param-name>
                <param-value>jdbc:mysql://localhost:3306/javaee</param-value>
            </init-param>
            
            <init-param>
                <param-name>user</param-name>
                <param-value>root</param-value>
            </init-param>
            
            <init-param>
                <param-name>pass</param-name>
                <param-value>32147</param-value>
            </init-param>
        </servlet>
        <servlet-mapping>
            
            <servlet-name>testServlet</servlet-name>
            
            <url-pattern>/testServlet</url-pattern>
        </servlet-mapping>
    
    </web-app>

**四 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/8a8929f24a574b6798b7b453f5fd791a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/67d09336b11048319e270d13ce8f73d8.png