WEBAPP开发之servlet开发简单Java Web项目-职坐标

WEBAPP开发之servlet开发简单Java Web项目

白羽 2019-01-08 来源：网络阅读 911 评论 0

摘要：本文将带你了解WEBAPP开发servlet开发简单Java Web项目，希望本文对大家学WEBAPP有所帮助。

本文将带你了解WEBAPP开发servlet开发简单Java Web项目，希望本文对大家学WEBAPP有所帮助。

1、表单

这里form中action不能带"/",不带/表示相对路径，带“/”表示绝对路径，必须写成/项目名称/url。

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "//www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>用户登录</title></head><body> <div> <form action="loginServlet" method="post"> <table> <tr> <td>用户名:</td> <td><input id="userCode" name="userCode" type="text"></td> </tr> <tr> <td>密码:</td> <td><input type="password" name="password"></td> </tr> <tr> <td><input type="submit" value="登录"></td> </tr> </table> </form> </div></body></html>

2、web.xml配置

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="//www.w3.org/2001/XMLSchema-instance" xmlns="//java.sun.com/xml/ns/javaee" xmlns:web="//java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="//java.sun.com/xml/ns/javaee //java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>pro-web02</display-name> <welcome-file-list> <welcome-file>login.jsp</welcome-file> <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> <servlet> <servlet-name>loginServlet</servlet-name> <servlet-class>cn.com.login.web.LoginController</servlet-class></servlet><servlet-mapping> <servlet-name>loginServlet</servlet-name> <url-pattern>/loginServlet</url-pattern></servlet-mapping></web-app>

这里的url-pattern中必须带/，不然会报错java.lang.IllegalArgumentException: Invalid <url-pattern> in servlet mapping

3、LoginController重写doPost和doGet代码

参考w3cSchool中servlet教程

//www.runoob.com/servlet/servlet-form-data.html

public class LoginController extends HttpServlet{ private static final long serialVersionUID = 1L; public LoginController() { super(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 设置响应内容类型 response.setContentType("text/html;charset=UTF-8"); System.out.println("用户名" + request.getParameter("userCode")); PrintWriter out = response.getWriter(); String title = "Using GET Method to Read Form Data"; String docType = "<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n"; out.println(docType + "<html>\n" + "<head><title>" + title + "</title></head>\n" + "<body bgcolor=\"#f0f0f0\">\n" + "<h1 align=\"center\">" + title + "</h1>\n" + "<ul>\n" + " <li><b>名字</b>：" + request.getParameter("userCode") + "\n" + "</ul>\n" + "</body></html>"); }// 处理 POST 方法请求的方法public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response);}}

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