Servlet登录案例

朴灿烈づ我的快乐病毒、 2022-02-15 11:02 198阅读 0赞

**一、web.xml方式配置servlet**

1、配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
    <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>/myservlet101</servlet-name>
                <servlet-class>com.mollen.servlet.MyServlet101</servlet-class>
                
                <load-on-startup>1</load-on-startup>
            </servlet>
            
            
            <servlet-mapping>
                <servlet-name>/myservlet101</servlet-name>
                <url-pattern>/myservlet101</url-pattern>
            </servlet-mapping>
            
    </web-app>

2、创建一个login.html

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>servlet表单测试101</title>
    </head>
    <body>
        <form method = "get" action="/myservlet101">
            <input name="password" type="text" placeholder="get方式，请输入账号"/>
            <input name="passeord" type="submit" value="登陆"/>
        </form>
        <br><hr><br>
        <form method ="post" action="/myservlet101">
            <input name="password" type="text" placeholder="post方式，请输入账号"/>
            <input name="passeord" type="submit" value="登陆"/>
        </form>
    </body>
    </html>

3.、新建一个自定义Servlet类MyServlet101

package com.mollen.servlet;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    /**
     * @ClassName:      MyServlet101
     * @Auther:         Mollen
     * @CreateTime:     2018-09-21  21:09:55
     * @Description:
     *                  web.xml配置servlet
     */
    public class MyServlet101 extends HttpServlet {
    
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            System.out.println("------------get请求方式-----------");
            String password = req.getParameter("password");
            System.out.println("get方式:"+password);
        }
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            System.out.println("------------post请求方式-----------");
            String password = req.getParameter("password");
            System.out.println("post方式:"+password);
        }
    }

**二、注解方式配置**

1、新建一个servlet类MyServlet102

package com.mollen.servlet;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    /**
     * @ClassName:      MyServlet102
     * @Auther:         Mollen
     * @CreateTime:     2018-09-21  21:05:51
     * @Description:
     *                  注解方式配置servlet
     */
    @WebServlet("/myservlet102")
    public class MyServlet102 extends HttpServlet {
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            System.out.println("------------get请求方式-----------");
            String password = req.getParameter("password");
            System.out.println("get方式:"+password);
        }
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            System.out.println("------------post请求方式-----------");
            String password = req.getParameter("password");
            System.out.println("post方式:"+password);
            
        }
    }

2、修改login.html

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>servlet表单测试102</title>
    </head>
    <body>
        <form method = "get" action="/myservlet102">
            <input name="password" type="text" placeholder="get方式，请输入银行密码"/>
            <input type="submit" value="登陆"/>
        </form>
        <br><hr><br>
        <form method ="post" action="/myservlet102">
            <input name="password" type="text" placeholder="post方式，请输入银行密码"/>
            <input type="submit" value="登陆"/>
        </form>
    </body>
    </html>

**三、运行效果**

1、页面效果  
![在这里插入图片描述][20190424135224193.png]

2、点击效果

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nMTUwMTE0_size_16_color_FFFFFF_t_70]

3、控制台效果

![在这里插入图片描述][2019042413530112.png]

摘自：[https://blog.csdn.net/mollen/article/details/82807369][https_blog.csdn.net_mollen_article_details_82807369]

[20190424135224193.png]: /images/20220215/8c82dddbcc4643be915e319c5e23a99b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nMTUwMTE0_size_16_color_FFFFFF_t_70]: /images/20220215/0648edf44ee24542ac285fe891865b70.png
[2019042413530112.png]: /images/20220215/35864369f054481b80186948cfd66b18.png
[https_blog.csdn.net_mollen_article_details_82807369]: https://blog.csdn.net/mollen/article/details/82807369