吴裕雄--天生自然JAVA开发JSP-Servlet学习笔记：servlet获取表单请求参数并在客户端显示2

<%-- 
    Document   : form
    Created on : 2020-4-12, 11:07:16
    Author     : Administrator
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title> 收集参数的表单页 </title>
    </head>
    <body>
        <form id="form1" 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>

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

import java.io.IOException;
import java.io.PrintStream;
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;

/**
 *
 * @author Administrator
 */
public class FirstServlet extends HttpServlet {

    protected void service(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // 设置解码方式
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        // 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>");
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<web-app metadata-complete="true" version="3.1" 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">
    <!-- 配置Servlet的名字 -->
    <servlet>
        <!-- 指定Servlet的名字，
        相当于指定@WebServlet的name属性 -->
        <servlet-name>firstServlet</servlet-name>
        <!-- 指定Servlet的实现类 -->
        <servlet-class>FirstServlet</servlet-class>
    </servlet>
    <!-- 配置Servlet的URL -->
    <servlet-mapping>
        <!-- 指定Servlet的名字 -->
        <servlet-name>firstServlet</servlet-name>
        <!-- 指定Servlet映射的URL地址，
        相当于指定@WebServlet的urlPatterns属性-->
        <url-pattern>/aa</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-list>
</web-app>

吴裕雄--天生自然JAVA开发JSP-Servlet学习笔记：servlet获取表单请求参数并在客户端显示2

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