HttpServletRequest对象——获取请求参数

快来打我* 2022-03-21 03:23 259阅读 0赞

### 文章目录 ###

*   *   *  一、项目结构
         *   *  1、表单
             *  2、servlet
             *  3、运行

### 一、项目结构 ###

#### 1、表单 ####

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>get请求</title>
    </head>
    <body>
        <form action="parameter" method="get">
            <h3>用户登录</h3>
            <p>用户名：<input type="text" name="username"></p>
            <p>密 码：<input type="text" name="password"> </p>
            <input type="submit" value="登录">
        </form>
    </body>
    </html>

#### 2、servlet ####

package net.test.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;
    
    @WebServlet(name="helloServlet",urlPatterns="/parameter")  //1、配置servlet
    public class HelloServlet extends HttpServlet {  //2、继承HttpServlet
    
        //3、重写doPost方法
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        }
    
        //3、重写doGet方法
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            //获取请求参数
            String username = req.getParameter("username");
            String password = req.getParameter("password");
            System.out.println("用户名:"+username);
            System.out.println("密码："+password);
        }
    }

#### 3、运行 ####

**访问浏览器：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hqdTIy_size_16_color_FFFFFF_t_70]  
**发起get请求**  
（输入用户名、密码，点击登录）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hqdTIy_size_16_color_FFFFFF_t_70 1]  
**运行结果：**  
![在这里插入图片描述][2019013012021146.]  
![在这里插入图片描述][20190130120101158.]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hqdTIy_size_16_color_FFFFFF_t_70]: /images/20220321/142b4d8a630e44afa1917e334d0fe48f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hqdTIy_size_16_color_FFFFFF_t_70 1]: /images/20220321/48a0e5707891411398c6ee968bbfb492.png
[2019013012021146.]: /images/20220321/7e762819a01e4783b50eff676cc67c33.png
[20190130120101158.]: /images/20220321/eb46d28eb15e4883b02e347bd4e7aaf0.png