前言：

前面已经讲了如何配置jdk，Tomcat和Mysql。这次我们来实现以下如何将本地的项目部署到服务器。
前台两个页面：
Index.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
买了个服务器 第一次尝试搭建网站
<form action="${pageContext.request.contextPath}/index_servlet" method="GET">
<input type="text" name = "name" />
<input type="submit" value ="跟我去后台看看"/>
</form>
</body>
</html>

Newfile.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
哈哈哈哈 ！欢迎：${name } ！

</body>
</html>

dao层：

public class TeacherDaoImpl {

    Connection connection = null;
    PreparedStatement prepareStatement = null;
    ResultSet result = null;

    // 保存注册信息
    public void save(String name) {

        String sql = "INSERT INTO teachers(name) value(?)";
        try {
            connection = jdbcUtil.getConnection();
            prepareStatement = connection.prepareStatement(sql);
            prepareStatement.setString(1, name);
            prepareStatement.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        } finally {
            jdbcUtil.close(connection, prepareStatement);
        }
    }
}

servlet：


    TeacherDaoImpl teacherDaoImpl = new TeacherDaoImpl();
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setCharacterEncoding("utf-8");
        String name = request.getParameter("name");
        teacherDaoImpl.save(name);
        request.setAttribute("name", name);
        request.getRequestDispatcher("/NewFile.jsp").forward(request, response);
    }

jdbcUtils：

package utils;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class jdbcUtil {
    private static String url = null;
    private static String user = null;
    private static String password = null;
    private static String driverClass = null;
    static {
        try {
            Properties properties = new Properties();
            //得到配置文件的流通道
            InputStream in = jdbcUtil.class.getResourceAsStream("/db.properties");
            properties.load(in);
            url = properties.getProperty("url");
            user = properties.getProperty("user");
            password = properties.getProperty("password");
            driverClass = properties.getProperty("driverClass");
            //注册Driver
            Class.forName(driverClass);
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("驱程程序注册出错");
        }
    }

    //得到连接
    public static Connection getConnection() {
        try {
            Connection cnn = DriverManager.getConnection(url, user, password);
            return cnn;
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    //关闭连接
    public static void close(Connection cnn, Statement st) {
        if (st != null) {
            try {
                st.close();
                st = null;     //告知系统回收
            } catch (Exception e) {
                e.printStackTrace();
                //将错误转换成RuntimeException运行错误抛出
                throw new RuntimeException(e);   
            }
        }
        if (cnn != null) {
            try {
                cnn.close();
                cnn = null;
            } catch (SQLException e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            }
        }
    }

    //关闭连接重载
    public static void close(Connection cnn, Statement st, ResultSet rs) {
        if (rs != null) {
            try {
                rs.close();
                rs = null;
            } catch (Exception e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            }
        }
        if (st != null) {
            try {
                st.close();
                rs = null;  
            } catch (Exception e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            }
        }
        if (cnn != null) {
            try {
                cnn.close();
                cnn = null;
            } catch (Exception e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            }
        }
    }
}

db.properties：

url=jdbc:mysql://localhost:3306/day15?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8&useSSL=false
user=root
password=123456
driverClass=com.mysql.cj.jdbc.Driver

注意：关键是数据库之间的连接。

还有要把项目打包成war包我的是：wanindex.war 上传到apache-tomcat-9.0.10的webapps。
当运行一次的时候它自动解压：wanindex wanindex.war

我的还挂载服务器上：

http://codingcoge.cn:8080/wanindex/Index.jsp

CentOS7下Tomcat部署javaweb项目连接数据库

前言：

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