Servlet 表单数据

雨点打透心脏的1/2处 2021-09-30 15:56 301阅读 0赞

> 很多情况下，需要传递一些信息，从浏览器到 Web 服务器，最终到后台程序。浏览器使用两种方法可将这些信息传递到 Web 服务器，分别为  
> GET 方法和 POST 方法。

javawbe网页项目目录结构：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI1Nzc0NzQ_size_16_color_FFFFFF_t_70]

HelloForm.java Servlet 程序代码

import java.io.IOException;
    import java.io.PrintWriter;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /** * Servlet implementation class HelloForm */
    @WebServlet("/HelloForm")
    public class HelloForm extends HttpServlet { 
        private static final long serialVersionUID = 1L;
           
        /** * @see HttpServlet#HttpServlet() */
        public HelloForm() { 
            super();
            // TODO Auto-generated constructor stub
        }
    
        /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            // 设置响应内容类型
            response.setContentType("text/html;charset=UTF-8");
    
            PrintWriter out = response.getWriter();
            String title = "使用 GET 方法读取表单数据";
            // 处理中文
            String name =new String(request.getParameter("name").getBytes("ISO8859-1"),"UTF-8");
            String docType = "<!DOCTYPE html> \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>站点名</b>："
                + name + "\n" +
                " <li><b>网址</b>："
                + request.getParameter("url") + "\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);
        }
    }

web.xml 文件（servlet配置）

<?xml version="1.0" encoding="UTF-8"?>
    <web-app>
      <servlet>
        <servlet-name>HelloForm</servlet-name>
        <servlet-class>HelloForm</servlet-class>
      </servlet>
      <servlet-mapping>
        <servlet-name>HelloForm</servlet-name>
        <url-pattern>/TomcatTest/HelloForm</url-pattern>
      </servlet-mapping>
    </web-app>

index.html代码（表单提交页面）

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="utf-8">
    <title>表单提交</title>
    </head>
    <body>
    <form action="HelloForm" method="GET">
    网址名：<input type="text" name="name">
    <br />
    网址：<input type="text" name="url" />
    <input type="submit" value="提交" />
    </form>
    </body>
    </html>

运行结果：

![在这里插入图片描述][20190807154815810.png]  
提交表单。  
![在这里插入图片描述][2019080715484447.png]  
提交表单跳转目标url，并显示获得的表单数据。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTI1Nzc0NzQ_size_16_color_FFFFFF_t_70]: /images/20210726/295b31f625264734b60ad5eed0ac758b.png
[20190807154815810.png]: /images/20210726/7a8e9251033a4a4b9d4bf5c1bc37c50e.png
[2019080715484447.png]: /images/20210726/c2fc6f0b8c86451c8c68263d07d647ee.png