BeanUtils JDBCTemlpate Druid Servlet

2021-08-01 02:44:11

jar包：

登录实例：

前端：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
</head>
<body>
<form action="/servlet" method="post">
    <input type="text" name="username" />
    <input type="password" name="password"/>
    <input type="submit" value="登录" />
</form>
</body>
</html>

后端：

package cn.rongxinrou.web.servlet;

import org.apache.commons.beanutils2.BeanUtils;
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.lang.reflect.InvocationTargetException;
import java.util.Map;


@WebServlet("/servlet")
public class DemoServlet extends HttpServlet{
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        Map<String, String[]> map = req.getParameterMap();
        User user = new User();

        // 利用BeanUtils 封装对象
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        UserDao userDao = new UserDao();
        User login = userDao.login(user);

        if (login == null){
            req.getRequestDispatcher("/failServerlet").forward(req,resp);
        }else {
            req.setAttribute("user",user);
            req.getRequestDispatcher("/successServerlet").forward(req,resp);
        }
    }
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    }
}

package cn.rongxinrou.web.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("/successServerlet")
public class ServerletSuccess extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");
        User user = (User) req.getAttribute("user");
        resp.getWriter().write("登录成功:" + user.getUsername());
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doGet(req, resp);
    }
}

package cn.rongxinrou.web.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("/failServerlet")
public class failServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");
        resp.getWriter().write("登录失败");
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doGet(req, resp);
    }
}

具体功能：

package cn.rongxinrou.web.servlet;

import cn.danielw.spring.jdbc.JdbcTemplate;
import org.springframework.jdbc.core.BeanPropertyRowMapper;

public class UserDao {

    final JdbcTemplate jdbcTemplate = new JdbcTemplate(JDBCUtils.getDataSource());

    public User login(User loginUser){
        String sql = "select * from users where username = ? and password = ?";
        try{
            User user = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class),
                    loginUser.getUsername(),
                    loginUser.getPassword());
            return user;
        }catch (Exception e){
            System.out.println(e);
            return null;
        }
    }
}

package cn.rongxinrou.web.servlet;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

public class JDBCUtils {
    // 定义连接池成员变量
    private static DataSource ds;

    static {
        Properties pro = new Properties();
        try {
            // 加载配置文件
            pro.load(JDBCUtils.class.getResourceAsStream("/cn/druid.properties"));
            // 创建 Druid连接池对象
            ds = DruidDataSourceFactory.createDataSource(pro);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 返回连接池对象
    public static DataSource getDataSource(){
        return ds;
    }

    // 返回connection对象
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }
}

package cn.rongxinrou.web.servlet;

public class User {
    private String username;
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "username=‘" + username + ‘\‘‘ +
                ", password=" + password +
                ‘}‘;
    }
}

配置文件

driverClassname=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1/test
username=root
password=root
initialSize=5
maxActive=10
maxWait=3000

BeanUtils JDBCTemlpate Druid Servlet

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