Spring使用XML實現的小案例
項目結構
數據庫
配置文件
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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/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.xiaoge</groupId> <artifactId>account_xmlioc</artifactId> <version>1.0-SNAPSHOT</version> <packaging>jar</packaging> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.0.2.RELEASE</version> </dependency> <dependency> <groupId>commons-dbutils</groupId> <artifactId>commons-dbutils</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.13</version> </dependency> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>0.9.1.2</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> </dependencies> </project> -
bean.xml重點
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- 配置service對象 --> <bean id="accountService" class="com.xiaoge.service.impl.AccountServiceImpl"> <!-- set注入Dao對象 --> <property name="accountDao" ref="accountDao"></property> </bean> <!-- 配置Dao對象 --> <bean id="accountDao" class="com.xiaoge.dao.impl.AccountDaoImpl"> <!-- set注入QueryRunner --> <property name="runner" ref="runner"></property> </bean> <!-- 配置QueryRunner對象 配置成多例, 單例對象會有線程安全問題 --> <bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype"> <!-- 帶參構造注入數據源 --> <constructor-arg name="ds" ref="dataSource"></constructor-arg> </bean> <!-- 配置數據源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <!-- 注入鏈接數據庫的必備信息 --> <property name="driverClass" value="com.mysql.cj.jdbc.Driver"></property> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/eesy"></property> <property name="user" value="root"></property> <property name="password" value="123456"></property> </bean> </beans>
實體類
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Account
package com.xiaoge.domain; import java.io.Serializable; /** * @Author: 瀟哥 * @DateTime: 2020/4/7 下午10:16 * @Description: 賬戶實體類 */ public class Account implements Serializable { private Integer id; private String name; private Float money; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Float getMoney() { return money; } public void setMoney(Float money) { this.money = money; } @Override public String toString() { return "Account{" + "id=" + id + ", name='" + name + '\'' + ", money=" + money + '}'; } }
持久層
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AccountDao接口
package com.xiaoge.dao; import com.xiaoge.domain.Account; import java.util.List; /** * @Author: 瀟哥 * @DateTime: 2020/4/7 下午10:25 * @Description: 賬戶的持久層接口 */ public interface AccountDao { /** * 查詢所有 * @return */ public List<Account> findAllAccount(); /** * 查詢一個 * @return */ public Account findAccountById(Integer id); /** * 保存 */ public void saveAccount(Account account); /** * 更新 * @param account */ public void updateAccount(Account account); /** * 刪除 * @param id */ public void deleteAccount(Integer id); } -
AccountDaoImpl實體類
package com.xiaoge.dao.impl; import com.xiaoge.dao.AccountDao; import com.xiaoge.domain.Account; import org.apache.commons.dbutils.QueryRunner; import org.apache.commons.dbutils.handlers.BeanHandler; import org.apache.commons.dbutils.handlers.BeanListHandler; import java.sql.SQLException; import java.util.List; /** * @Author: 瀟哥 * @DateTime: 2020/4/7 下午10:25 * @Description: 賬戶的持久層實現類 */ public class AccountDaoImpl implements AccountDao { private QueryRunner runner; public void setRunner(QueryRunner runner) { this.runner = runner; } public List<Account> findAllAccount() { try { return runner.query("select * from account", new BeanListHandler<Account>(Account.class)); } catch (SQLException e) { throw new RuntimeException(e); } } public Account findAccountById(Integer id) { try { return runner.query("select * from account where id = ? ", new BeanHandler<Account>(Account.class), id); } catch (SQLException e) { throw new RuntimeException(e); } } public void saveAccount(Account account) { try { runner.update("insert into account(name, money) values(?, ?)", account.getName(), account.getMoney()); } catch (SQLException e) { throw new RuntimeException(e); } } public void updateAccount(Account account) { try { runner.update("update account set name = ?, money = ? where id = ? ", account.getName(), account.getMoney(), account.getId()); } catch (SQLException e) { throw new RuntimeException(e); } } public void deleteAccount(Integer id) { try { runner.update("delete from account where id = ? ", id); } catch (SQLException e) { throw new RuntimeException(e); } } }
業務層
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AccountService接口
package com.xiaoge.service; import com.xiaoge.domain.Account; import java.util.List; /** * @Author: 瀟哥 * @DateTime: 2020/4/7 下午10:14 * @Description: 賬戶的業務層接口 */ public interface AccountService { /** * 查詢所有 * @return */ public List<Account> findAllAccount(); /** * 查詢一個 * @return */ public Account findAccountById(Integer id); /** * 保存 */ public void saveAccount(Account account); /** * 更新 * @param account */ public void updateAccount(Account account); /** * 刪除 * @param id */ public void deleteAccount(Integer id); } -
AccountServiceImpl實現類
package com.xiaoge.service.impl; import com.xiaoge.dao.AccountDao; import com.xiaoge.domain.Account; import com.xiaoge.service.AccountService; import java.util.List; /** * @Author: 瀟哥 * @DateTime: 2020/4/7 下午10:14 * @Description: 賬戶的業務層實現類 */ public class AccountServiceImpl implements AccountService { private AccountDao accountDao; public void setAccountDao(AccountDao accountDao) { this.accountDao = accountDao; } public List<Account> findAllAccount() { return accountDao.findAllAccount(); } public Account findAccountById(Integer id) { return accountDao.findAccountById(id); } public void saveAccount(Account account) { accountDao.saveAccount(account); } public void updateAccount(Account account) { accountDao.updateAccount(account); } public void deleteAccount(Integer id) { accountDao.deleteAccount(id); } }
測試
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AccountServiceTest
package com.xiaoge.test; import com.xiaoge.domain.Account; import com.xiaoge.service.AccountService; import org.junit.Test; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.util.List; /** * @Author: 瀟哥 * @DateTime: 2020/4/7 下午10:52 * @Description: 使用Junit單元測試, 測試我們的配置 */ public class AccountServiceTest { @Test public void findAllTest() { // 1. 獲取核心容器 ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml"); // 2. 獲取service對象 AccountService accountService = (AccountService)ac.getBean("accountService"); // 3. 執行方法 List<Account> allAccount = accountService.findAllAccount(); for (Account account : allAccount) { System.out.println(account); } ac.close(); } @Test public void findOneTest() { // 1. 獲取核心容器 ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml"); // 2. 獲取service對象 AccountService accountService = (AccountService)ac.getBean("accountService"); // 3. 執行方法 Account account = accountService.findAccountById(1); System.out.println(account); ac.close(); } @Test public void saveAccountTest() { // 1. 獲取核心容器 ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml"); // 2. 獲取service對象 AccountService accountService = (AccountService)ac.getBean("accountService"); // 3. 構造對象 Account account = new Account(); account.setId(4); account.setName("ddd"); account.setMoney(2000f); // 4. 執行方法 accountService.saveAccount(account); ac.close(); } @Test public void updateAccountTest() { // 1. 獲取核心容器 ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml"); // 2. 獲取service對象 AccountService accountService = (AccountService)ac.getBean("accountService"); // 3. 構造對象 Account account = new Account(); account.setId(3); account.setName("ddd"); account.setMoney(2000f); // 4. 執行方法 accountService.updateAccount(account); ac.close(); } @Test public void deleteAccountTest() { // 1. 獲取核心容器 ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml"); // 2. 獲取service對象 AccountService accountService = (AccountService)ac.getBean("accountService"); // 3. 執行方法 accountService.deleteAccount(3); ac.close(); } }