form表单处理——使用servlet展示用户名、密码

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helloworldservlet.java

package testservlet;import java.io.*;import javax.servlet.http.*;import javax.security.auth.message.callback.PrivateKeyCallback.Request;import javax.servlet.*;public class HelloWorldServlet extends HttpServlet {    // private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {        // req.setCharacterEncoding("UTF-8");        String name = req.getParameter("name");        String age = req.getParameter("age");        String name1 = new String(name.getBytes("ISO-8859-1"), "UTF-8");        // System.out.println("name1:"+name1);        // System.out.println("age:"+age);        res.setHeader("Content-Type", "text/html;charset=UTF-8");        res.getWriter().write("name" + name + "age" + age);    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        req.setCharacterEncoding("UTF-8");        String name = req.getParameter("name");         String age = req.getParameter("age");        resp.setHeader("Content-Type", "text/html;charset=UTF-8");        resp.getWriter().write("name" + name +"<br>"+ "age" + age);    }}

helloword.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><a href="hello?name=王 &age=12">提交</a><form action="hello" method="post">    姓名：<input name="name"><br><br>    密码：<input name="age"><br><br>    <input type="submit" value="提交">    <input type="reset" value="重置"></form></body></html>

web.xml

<?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>test1</display-name> <welcome-file-list>    <welcome-file>helloword.jsp</welcome-file>  </welcome-file-list>  <servlet>    <servlet-name>HelloWorldServlet</servlet-name>    <servlet-class>testservlet.HelloWorldServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>HelloWorldServlet</servlet-name>    <url-pattern>/hello</url-pattern>  </servlet-mapping></web-app>

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