获取用户的用户名
一、方法
- ✅
String username = request.getParameter("username");
二、实现
public class RequestTestServlet extends HttpServlet { @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //设置请求体的字符集 //以免Tomcat9级以下版本出现乱码 request.setCharacterEncoding("UTF-8"); //这是Post请求 String username = request.getParameter("username"); //输出这个用户提交的用户名 System.out.println(username); }}
<?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_4_0.xsd" version="4.0"> <servlet> <servlet-name>RequestTestServlet</servlet-name> <servlet-class>servlet.RequestTestServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>RequestTestServlet</servlet-name> <url-pattern>/testrequest</url-pattern> </servlet-mapping></web-app>

三、解决请求体的乱码问题
- ✅Tomcat9版本以下,若用户输入中文表单,通过前端输入到后端的数据则会显示乱码
3.1 解决
//设置请求体的字符集 //以免Tomcat9级以下版本出现乱码 request.setCharacterEncoding("UTF-8");