HttpServletResponse响应对象发送响应消息体

浅浅的花香味﹌ 2022-03-21 05:05 350阅读 0赞

getOutputStream()//获取字节流输出对象

这个实例将展示用户输入用户名、密码登录后，然后返回文本“登录成功，欢迎你”

**实例**  
**get.html**

<!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>

**HelloServlet.java**

package net.test.servlet;
    
    import javax.servlet.ServletException;
    import javax.servlet.ServletOutputStream;
    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);
    
            //响应
            String result="登录成功，欢迎你";
            ServletOutputStream outputStream = resp.getOutputStream();
            outputStream.write(result.getBytes());
    
        }
    }

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]  
表单输入用户名、密码：

![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][20190130191526788.]  
![在这里插入图片描述][20190130191551951.]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hqdTIy_size_16_color_FFFFFF_t_70]: /images/20220321/578f334822a64806ba4e6336f81689f9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hqdTIy_size_16_color_FFFFFF_t_70 1]: /images/20220321/3bb25c36daf54829a425186730a241a4.png
[20190130191526788.]: /images/20220321/137bd44830e84bea8e7d2e0d196c5a45.png
[20190130191551951.]: /images/20220321/bcd53d17db68406d8e53ce6d9d290e43.png