JavaWeb 自制基础开发框架准备环境搭建

目录

一、基本目录结构

1、创建webapp的maven项目

2、配置web.xml项目

3、创建目录结构：

4、添加数据库配置文件

二、数据库模块配置：

1、连接数据库

2、 写入每个表对应的实体类

 3、编写数据库操作的基类

三、添加编码过滤器

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一、基本目录结构

1、创建webapp的maven项目

配置pom.xml的一些常用web依赖：

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.wxl</groupId><artifactId>smbms</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><properties><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>4.0.1</version></dependency><dependency><groupId>javax.servlet.jsp</groupId><artifactId>javax.servlet.jsp-api</artifactId><version>2.3.3</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.27</version></dependency><dependency><groupId>javax.servlet.jsp.jstl</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><dependency><groupId>org.apache.taglibs</groupId><artifactId>taglibs-standard-impl</artifactId><version>1.2.5</version></dependency></properties> </project>

2、配置web.xml项目

<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/javaeehttp://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"version="4.0" metadata-complete="true"><!--字符编码过滤器--><filter><filter-name>CharacterEncodingFilter</filter-name><filter-class>com.wxl.filter.CharacterEncodingFilter</filter-class></filter><filter-mapping><filter-name>CharacterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping> </web-app>

3、创建目录结构：

4、添加数据库配置文件

driver=com.mysql.cj.jdbc.Driver url=jdbc:mysql://localhost:3306/smbms?useUnicode=true&characterEncoding=utf-8 username=root password=root

 

二、数据库模块配置：

1、连接数据库

2、 写入每个表对应的实体类

 3、编写数据库操作的基类

package com.wxl.dao;import java.io.IOException; import java.io.InputStream; import java.sql.*; import java.util.Properties;//操作数据库的公共类 public class BaseDao {private static String driver;private static String url;private static String username;private static String password;//静态代码块，类加载的时候就初始化了static {Properties properties = new Properties();//通过类加载器读取对应的资源InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");try {properties.load(is);} catch (IOException e) {e.printStackTrace();}driver = properties.getProperty("driver");url = properties.getProperty("url");username = properties.getProperty("username");password = properties.getProperty("password");}//获取数据库的链接public static Connection getConnection() {Connection connection = null;try {Class.forName(driver);connection = DriverManager.getConnection(url, username, password);} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException throwables) {throwables.printStackTrace();}return connection;}//编写查询公共类public static ResultSet execute(Connection connection, String sql, Object[] params, ResultSet resultSet, PreparedStatement preparedStatement) throws SQLException {//预编译的sql,在后面直接执行就可以了preparedStatement = connection.prepareStatement(sql);for (int i = 0; i < params.length; i++) {//setObject,占位符从1开始，但是我们的数组是从0开始！preparedStatement.setObject(i + 1, params[i]);}resultSet = preparedStatement.executeQuery();return resultSet;}//编写增删改公共方法public static int execute(Connection connection, String sql, Object[] params, PreparedStatement preparedStatement) throws SQLException {preparedStatement = connection.prepareStatement(sql);for (int i = 0; i < params.length; i++) {//setObject,占位符从1开始，但是我们的数组是从0开始！preparedStatement.setObject(i + 1, params[i]);}int updateRows = preparedStatement.executeUpdate();return updateRows;}//释放资源public static boolean closeResource(Connection connection, PreparedStatement preparedStatement, ResultSet resultSet) {boolean flag = true;if (resultSet != null) {try {resultSet.close();resultSet = null;} catch (SQLException throwables) {throwables.printStackTrace();flag = false;}}if (preparedStatement != null) {try {preparedStatement.close();preparedStatement = null;} catch (SQLException throwables) {throwables.printStackTrace();flag = false;}}if (connection != null) {try {connection.close();connection = null;} catch (SQLException throwables) {throwables.printStackTrace();flag = false;}}return flag;} }

三、添加编码过滤器

package com.wxl.filter;import javax.servlet.*; import java.io.IOException;public class CharacterEncodingFilter implements Filter{public void init(FilterConfig filterConfig) throws ServletException {}public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {servletRequest.setCharacterEncoding("utf-8");servletResponse.setCharacterEncoding("utf-8");filterChain.doFilter(servletRequest,servletResponse);}public void destroy() {} }

这里注意导包路径！

前面已经在web.xml里进行了注册。

一个干净，具有基础功能的框架制作完成。

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