我的 Java 入门项目

我入门 Java 是在2019年10月入的，当时已经学完了 C语言，因此这个入门项目只用了一个下午

工具：IDEA + MariaDB + Navicat + Tomcat + maven

SQL 文件

CREATE DATABASE  `book` DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
DROP TABLE IF EXISTS `employees_cn`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `employees_cn` (`employee_id` int(11) NOT NULL AUTO_INCREMENT,`employee_name` varchar(255) COLLATE utf8_bin DEFAULT NULL,`employee_address` varchar(255) COLLATE utf8_bin DEFAULT NULL,`employee_price` int(10) DEFAULT NULL,PRIMARY KEY (`employee_id`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=49 DEFAULT CHARSET=utf8 COLLATE=utf8_bin ROW_FORMAT=DYNAMIC;INSERT INTO `employees_cn`
VALUES (1,'张伟','北京',20000),(6,'周通','上海',17500),(14,'王飞','赣州',28000),(17,'马超','佛山',20000),(18,'刘备','抚州',15000),(20,'李兰','北京',20000),(21,'李兰妈','株洲',46000),(22,'周杰','深圳',20000),(23,'丁宁','天津',1500),(24,'张飞','上饶',25000),(25,'周杰','深圳',20000),(48,'孙红雷','哈尔滨',30000);

创建 JavaWeb 项目

新建工程后，maven会下载一些文件，没多大，大家耐心等待即可。

新建工程成功以后是下面这样的：

首先在 pom.xml 文件中 </build> 上面添加如下代码，添加完成后，等待它自己加载完成即可。

<plugins><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.2</version><configuration><hostName>localhost</hostName>        <!--   Default: localhost --><port>8080</port>                     <!-- 启动端口 Default:8080 --><path>/</path>   <!-- 访问应用路径  Default: /${project.artifactId}--><uriEncoding>UTF-8</uriEncoding>      <!-- uri编码 Default: ISO-8859-1 --></configuration></plugin>
</plugins>

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-5hev7IAV-1641652031656)(https://s2.loli.net/2022/01/08/hEJs4iGewcVdIfg.png)]

编写代码

pom.xml

<?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/4.0.0http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.baidu</groupId><artifactId>MyBlog</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><name>MyBlog Maven Webapp</name><!-- FIXME change it to the project's website --><url>http://www.example.com</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.7</maven.compiler.source><maven.compiler.target>1.7</maven.compiler.target></properties><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version><scope>test</scope></dependency><!-- https://mvnrepository.com/artifact/com.speedment.runtime/runtime-typemapper --><dependency><groupId>com.speedment.runtime</groupId><artifactId>runtime-typemapper</artifactId><version>3.2.10</version></dependency><!-- https://mvnrepository.com/artifact/org.teiid.connectors/translator-loopback --><dependency><groupId>org.teiid.connectors</groupId><artifactId>translator-loopback</artifactId><version>16.0.0</version></dependency><!-- https://mvnrepository.com/artifact/org.apache.xmlgraphics/batik-css --><dependency><groupId>org.apache.xmlgraphics</groupId><artifactId>batik-css</artifactId><version>1.14</version></dependency><!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.25</version></dependency><!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api --><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>4.0.1</version><scope>provided</scope></dependency><!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api --><dependency><groupId>javax.servlet.jsp</groupId><artifactId>javax.servlet.jsp-api</artifactId><version>2.3.3</version><scope>provided</scope></dependency><!-- https://mvnrepository.com/artifact/javax.servlet/jstl --><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency></dependencies><build><finalName>MyBlog</finalName><pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --><plugins><plugin><artifactId>maven-clean-plugin</artifactId><version>3.1.0</version></plugin><!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging --><plugin><artifactId>maven-resources-plugin</artifactId><version>3.0.2</version></plugin><plugin><artifactId>maven-compiler-plugin</artifactId><version>3.8.0</version></plugin><plugin><artifactId>maven-surefire-plugin</artifactId><version>2.22.1</version></plugin><plugin><artifactId>maven-war-plugin</artifactId><version>3.2.2</version></plugin><plugin><artifactId>maven-install-plugin</artifactId><version>2.5.2</version></plugin><plugin><artifactId>maven-deploy-plugin</artifactId><version>2.8.2</version></plugin></plugins></pluginManagement><plugins><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.2</version><configuration><hostName>localhost</hostName>        <!--   Default: localhost --><port>8081</port>                     <!-- 启动端口 Default:8080 --><path>/</path>   <!-- 访问应用路径  Default: /${project.artifactId}--><uriEncoding>UTF-8</uriEncoding>      <!-- uri编码 Default: ISO-8859-1 --></configuration></plugin></plugins></build>
</project>

DatabaseForBook.java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;/**** @author colors* @date 2019/10/26*/public class DatabaseForBook {private final String url = "jdbc:mysql://localhost:3306/book?characterEncoding=UTF8&servertimeZone=GMT%2B8";private final String driver  = "com.mysql.jdbc.Driver";private final String name = "root";private final String password  = "123456";private Connection connection = null;private final List allEmployees = new ArrayList();public void openDatabase(){try {// 加载驱动Class.forName(driver);connection = DriverManager.getConnection(url,name,password);} catch (ClassNotFoundException | SQLException e) {e.printStackTrace();}}public void addData(String name, String address , float price){// 打开数据库openDatabase();try {// 操作数据库的一个sql语句String sql = "INSERT into employees_cn (employee_name,employee_address,employee_price) VALUES (?,?,?)";// 获取声明PreparedStatement statement = connection.prepareStatement(sql);statement.setObject(1,name);statement.setObject(2,address);statement.setObject(3,price);// 执行你的sqlstatement.execute();} catch (SQLException e) {e.printStackTrace();}closeDatabase();}public void deleteData(String name){openDatabase();String sql = "DELETE FROM employees_cn WHERE employee_name= ?";try {PreparedStatement statement = connection.prepareStatement(sql);statement.setObject(1, name);statement.execute();} catch (SQLException e) {e.printStackTrace();}closeDatabase();}public  void updateData(String addreess, int price, String name){openDatabase();String sql = "UPDATE employees_cn set employee_address = ? , employee_price = ? WHERE employee_name = ?";try {PreparedStatement statement = connection.prepareStatement(sql);statement.setObject(1, addreess);statement.setObject(2, price);statement.setObject(3, name);statement.execute();} catch (SQLException e) {e.printStackTrace();}closeDatabase();}public List selectData() {openDatabase();String sql = "select * from employees_cn";try {PreparedStatement statement = connection.prepareStatement(sql);ResultSet resultSet = statement.executeQuery();while (resultSet.next()) {int id = resultSet.getInt("employee_id");String name = resultSet.getString("employee_name");String address = resultSet.getString("employee_address");int price = resultSet.getInt("employee_price");// soutSystem.out.println(id + "  " + name + "  " + address + "  " + price);// 集合Map<String, Object> employee = new HashMap<>();employee.put("id", id);employee.put("name", name);employee.put("address", address);employee.put("price", price);allEmployees.add(employee);}return allEmployees;} catch (SQLException e) {e.printStackTrace();}closeDatabase();return null;}public void closeDatabase(){if (connection !=null){try {connection.close();} catch (SQLException e) {e.printStackTrace();}}}
}

BookServlet.java

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;/**** @author colors* @date 2019/10/27*/
// 接受客户请求
// 返回数据给客户
public class BookServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {// 去查数据库DatabaseForBook databaseForBook = new DatabaseForBook();List allEmployees = databaseForBook.selectData();// 将数据放到网页里req.setAttribute("all", allEmployees);// 将网页返给用户req.getRequestDispatcher("employee.jsp").forward(req, resp);}
}

TestBook.java

import org.junit.Test;/*** Created by guoke on 2019/10/30.*/
public class TestBook {@Testpublic void testBook(){DatabaseForBook databaseForBook = new DatabaseForBook();databaseForBook.addData("郭柯柯","九江",30000);}@Testpublic void testSelect(){DatabaseForBook databaseForBook = new DatabaseForBook();databaseForBook.selectData();}@Testpublic void testDelete(){DatabaseForBook databaseForBook = new DatabaseForBook();databaseForBook.deleteData("郭柯柯");}@Testpublic void testUpdate(){DatabaseForBook databaseForBook = new DatabaseForBook();databaseForBook.updateData("北京", 20000, "刘备");}
}

index.jsp

<html><body><h2>Hello World!</h2></body>
</html>

employee.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page isELIgnored="false" %>
<%--Created by IntelliJ IDEA.User: colorsDate: 2019/10/27Time: 15:53To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html><head><title>部门员工表</title></head><body><%-- jsp + el + jstl --%><table border="1" cellspacing="0" align="center" ><caption><h3>部门员工表</h3></caption><thead><tr><th>工号</th><th>姓名</th><th>住址</th><th>工资</th></tr></thead><c:forEach items="${all}" var="employee"><tr><td>${employee.id}</td><td>${employee.name}</td><td>${employee.address}</td><td>${employee.price}</td></tr></c:forEach></table></body>
</html>

web.xml

<!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app><display-name>Archetype Created Web Application</display-name><servlet><servlet-name>a</servlet-name><servlet-class>BookServlet</servlet-class></servlet><servlet-mapping><servlet-name>a</servlet-name><url-pattern>/all</url-pattern></servlet-mapping>
</web-app>

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我的 Java 入门项目

我的 Java 入门项目

SQL 文件

创建 JavaWeb 项目

编写代码

pom.xml

DatabaseForBook.java

BookServlet.java

TestBook.java

index.jsp

employee.jsp

web.xml

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