响应行设置响应状态码:
void setStatus(int sc);
设置响应头键值对:
void setHeader(String name,String value);
response实现重定向
resp.setStatus(302);resp.setHeader("location","https://www.4399.com");
前端a.html登录,将结果传给后端,用request接收,用Mybatis框架连接数据库,获取用户名和密码,
并与前端接收到的用户名,密码匹配,如果匹配成功,通过response输出到网站,显示登录成功
package com.stdu.web;import com.stdu.mapper.UserMapper;
import com.stdu.pojo.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;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;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.*;@WebServlet(urlPatterns = "/test3")
public class a03Request_Test extends HttpServlet {Set<String> set = new HashSet<>();@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String resource = "mybatis-config.xml";InputStream inputStream = Resources.getResourceAsStream(resource);SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);SqlSession sqlSession = sqlSessionFactory.openSession();UserMapper userMapper = sqlSession.getMapper(UserMapper.class);ArrayList<User> users = userMapper.selectAllUser();//请求方式POST,解决request中文乱码//req.setCharacterEncoding("UTF-8");String username = req.getParameter("username");String password = req.getParameter("password");System.out.println(username + " "+ password);resp.setHeader("content-type","text/html;charset=utf-8");boolean flag = false;for (User u : users) {if(u.getPassword().equals(password) && u.getUsername().equals(username)){resp.getWriter().write(username + "登录成功");flag = true;return;}}if(!flag) resp.getWriter().write("用户名或密码错误");}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {this.doGet(req,resp);}
}