Java学习之：Spring的扩展配置

　　1、在配置文件applicationContext.xml中，引入相关的配置文件方式：

　　2、使用Jndi数据源的方式改造配置文件applicationContext.xml：

　　3、注释配置文件applicationContext.xml中的数据源：

　　4、找到安装Tomcat的文件夹，在conf目录下打开context.xml配置文件，添加如下代码：

　　5、在包com.javaxyz.servlet下，创建UserServlet.java文件

　　6、控制台显示结果：

　　7、bug场景：引入database.properties配置文件时报错：

　　1、在配置文件applicationContext.xml中，引入相关的配置文件方式：

　　classpath:database.properties

　　2、使用Jndi数据源的方式改造配置文件applicationContext.xml：

　　java:comp/env/jdbc/java

　　3、注释配置文件applicationContext.xml中的数据源：

　　4、找到安装Tomcat的文件夹，在conf目录下打开context.xml配置文件，添加如下代码：

　　type="javax.sql.DataSource"

　　auth="Container"

　　driverClassName="com.mysql.jdbc.Driver"

　　url="jdbc:mysql:///p19_java7_mybatis"

　　username="root"

　　password="aaa"

　　maxActive="100"

　　maxIdle="50"

　　maxWait="1000"

　　/>

　　5、在包com.javaxyz.servlet下，创建UserServlet.java文件

　　/**

　　* @Author：DongGaoYun

　　* @Description:

　　* @Date 2019-10-9　下午5:11:10

　　* @Version 1.0

　　* @Company: www.springhome.org

　　*/

　　package com.javaxyz.servlet;

　　import java.io.IOException;

　　import java.io.PrintWriter;

　　import java.text.ParseException;

　　import java.text.SimpleDateFormat;

　　import java.util.ArrayList;

　　import java.util.Date;

　　import java.util.List;

　　import javax.servlet.ServletException;

　　import javax.servlet.http.HttpServlet;

　　import javax.servlet.http.HttpServletRequest;

　　import javax.servlet.http.HttpServletResponse;

　　import org.apache.log4j.Logger;

　　import org.junit.Test;

　　import org.springframework.context.ApplicationContext;

　　import org.springframework.context.support.ClassPathXmlApplicationContext;

　　import com.javaxyz.entity.User;

　　import com.javaxyz.service.UserService;

　　import com.javaxyz.test.SpringTest;

　　/**

　　* @ClassName：UserServlet.java

　　* @Description：描述信息

　　* @Author：DongGaoYun

　　* @Author English name：Andy

　　* @URL：www.javaxyz.com 或 www.gyun.org

　　* @Email：DongGaoYun@qq.com

　　* @QQ：1050968899

　　* @WeiXin：QingYunJiao

　　* @WeiXinGongZhongHao: JavaForum

　　* @Date：2019-10-9 下午5:11:10

　　* @Version：1.0

　　*/

　　public class UserServlet extends HttpServlet {

　　private static Logger logger = Logger.getLogger(UserServlet.class);

　　/**

　　* The doGet method of the servlet.

　　*

　　* This method is called when a form has its tag value method equals to get.

　　*

　　* @param request

　　* the request send by the client to the server

　　* @param response

　　* the response send by the server to the client

　　* @throws ServletException

　　* if an error occurred

　　* @throws IOException

　　* if an error occurred

　　*/

　　public void doGet(HttpServletRequest request, HttpServletResponse response)

　　throws ServletException, IOException {

　　doPost(request, response);

　　}

　　/**

　　* The doPost method of the servlet.

　　*

　　* This method is called when a form has its tag value method equals to

　　* post.

　　*

　　* @param request

　　* the request send by the client to the server

　　* @param response

　　* the response send by the server to the client

　　* @throws ServletException

　　* if an error occurred

　　* @throws IOException

　　* if an error occurred

　　*/

　　public void doPost(HttpServletRequest request, HttpServletResponse response)

　　throws ServletException, IOException {

　　/*

　　* add用户信息 UserService调用 配置声明式事务

　　*/

　　ApplicationContext context = new ClassPathXmlApplicationContext(

　　"applicationContext.xml");

　　// 原来是通过映射接口去调用

　　// UserMapper userMapper = (UserMapper) context.getBean("userMapper");

　　//

　　String[] bean = context.getBeanDefinitionNames();

　　for (String string : bean) {

　　System.out.println(string);

　　}

　　// 现在是通过业务接口去调用

　　UserService service = (UserService) context.getBean("userService");

　　User user = new User();

　　user.setUserCode("zhangxiulian");

　　user.setUserName("张秀连666");

　　/**

　　* userCode, userName, userPassword, gender, birthday, phone, address,

　　* userRole, createdBy, creationDate

　　*/

　　user.setUserPassword("123999");

　　user.setGender(0);

　　SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

　　try {

　　user.setBirthday(sdf.parse("2010-9-17"));

　　} catch (ParseException e) {

　　e.printStackTrace();

　　}

　　user.setPhone("13608880888");

　　user.setAddress("养育巷49");

　　user.setUserRole(2);

　　user.setCreatedBy(1);

　　user.setCreationDate(new Date());

　　Integer userRole = 2;

　　// int num = userMapper.addUser(user);

　　List listUsers = new ArrayList();

　　listUsers.add(user);

　　listUsers.add(user);

　　int num = service.saveUser(listUsers);

　　if (num > 0) {

　　logger.info("增加成功!");

　　} else {

　　logger.error("增加失败!");

　　}

　　}

　　}

　　注意：使用jndi数据源，显示结果需要启动Tomcat服务器，执行web路径:　http://localhost:9999/java7_chapter7_spring2_jndi/userServlet

　　6、控制台显示结果：

　　- (1061 ms) - 2019-10-9 17:15:13[DEBUG](PropertySourcesPropertyResolver.java:103) Could not find key 'spring.liveBeansView.mbeanDomain' in any property source. Returning [null]

　　org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0

　　dataSource

　　sqlSessionFactory

　　org.mybatis.spring.mapper.MapperScannerConfigurer#0

　　userService

　　org.springframework.context.annotation.internalConfigurationAnnotationProcessor

　　org.springframework.context.annotation.internalAutowiredAnnotationProcessor

　　org.springframework.context.annotation.internalRequiredAnnotationProcessor

　　org.springframework.context.annotation.internalCommonAnnotationProcessor

　　transactionManager

　　org.springframework.aop.config.internalAutoProxyCreator

　　org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0

　　org.springframework.transaction.interceptor.TransactionInterceptor#0

　　org.springframework.transaction.config.internalTransactionAdvisor

　　org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor

　　userMapper

　　- (1061 ms) - 2019-10-9 17:15:13[DEBUG](AbstractBeanFactory.java:243) Returning cached instance of singleton bean 'userService'

　　- (1063 ms) - 2019-10-9 17:15:13[DEBUG](AbstractBeanFactory.java:243) Returning cached instance of singleton bean 'org.springframework.transaction.interceptor.TransactionInterceptor#0'

　　- (1066 ms) - 2019-10-9 17:15:13[DEBUG](AbstractFallbackTransactionAttributeSource.java:107) Adding transactional method 'UserServiceImpl.saveUser' with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''

　　- (1069 ms) - 2019-10-9 17:15:13[DEBUG](AbstractBeanFactory.java:243) Returning cached instance of singleton bean 'transactionManager'

　　- (1076 ms) - 2019-10-9 17:15:13[DEBUG](AbstractPlatformTransactionManager.java:366) Creating new transaction with name [com.javaxyz.service.impl.UserServiceImpl.saveUser]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''

　　- (1078 ms) - 2019-10-9 17:15:13[DEBUG](DataSourceTransactionManager.java:204) Acquired Connection [jdbc:mysql:///p19_java7_mybatis, UserName=root@localhost, MySQL-AB JDBC Driver] for JDBC transaction

　　- (1087 ms) - 2019-10-9 17:15:13[DEBUG](DataSourceTransactionManager.java:221) Switching JDBC Connection [jdbc:mysql:///p19_java7_mybatis, UserName=root@localhost, MySQL-AB JDBC Driver] to manual commit

　　- (1093 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) Creating a new SqlSession

　　- (1099 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) Registering transaction synchronization for SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1cd1130a]

　　- (1138 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) JDBC Connection [jdbc:mysql:///p19_java7_mybatis, UserName=root@localhost, MySQL-AB JDBC Driver] will be managed by Spring

　　- (1141 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) ooo Using Connection [jdbc:mysql:///p19_java7_mybatis, UserName=root@localhost, MySQL-AB JDBC Driver]

　　- (1146 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) ==> Preparing: INSERT INTO smbms_user (userCode, userName, userPassword, gender, birthday, phone, address, userRole, createdBy, creationDate) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?);

　　- (1172 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) ==> Parameters: zhangxiulian(String), 张秀连666(String), 123999(String), 0(Integer), 2010-09-17 00:00:00.0(Timestamp), 13608880888(String), 养育巷49(String), 2(Integer), 1(Integer), 2019-10-09 17:15:13.769(Timestamp)

　　- (1175 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1cd1130a]

　　- (1176 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) Fetched SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1cd1130a] from current transaction

　　- (1177 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) ooo Using Connection [jdbc:mysql:///p19_java7_mybatis, UserName=root@localhost, MySQL-AB JDBC Driver]

　　- (1178 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) ==> Preparing: INSERT INTO smbms_user (userCode, userName, userPassword, gender, birthday, phone, address, userRole, createdBy, creationDate) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?);

　　- (1178 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) ==> Parameters: zhangxiulian(String), 张秀连666(String), 123999(String), 0(Integer), 2010-09-17 00:00:00.0(Timestamp), 13608880888(String), 养育巷49(String), 2(Integer), 1(Integer), 2019-10-09 17:15:13.769(Timestamp)

　　- (1180 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1cd1130a]

　　- (1180 ms) - 2019-10-9 17:15:13[DEBUG](AbstractPlatformTransactionManager.java:753) Initiating transaction commit

　　- (1181 ms) - 2019-10-9 17:15:13[DEBUG](DataSourceTransactionManager.java:267) Committing JDBC transaction on Connection [jdbc:mysql:///p19_java7_mybatis, UserName=root@localhost, MySQL-AB JDBC Driver]

　　- (1188 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) Transaction synchronization committing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1cd1130a]

　　- (1188 ms) - 2019-10-9 17:15:13[DEBUG](JakartaCommonsLoggingImpl.java:46) Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1cd1130a]

　　- (1191 ms) - 2019-10-9 17:15:13[DEBUG](DataSourceTransactionManager.java:325) Releasing JDBC Connection [jdbc:mysql:///p19_java7_mybatis, UserName=root@localhost, MySQL-AB JDBC Driver] after transaction

　　- (1191 ms) - 2019-10-9 17:15:13[DEBUG](DataSourceUtils.java:327) Returning JDBC Connection to DataSource

　　- (1192 ms) - 2019-10-9 17:15:13[ INFO](UserServlet.java:126) 增加成功!

　　7、bug场景：引入database.properties配置文件时报错：

　　重点：

　　Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'users' in string value "${users}"

　　报错详情：无锡男科医院哪家好 http://www.bhnkyixue.com/

　　- (369 ms) - 2019-10-9 16:34:56[ WARN](AbstractApplicationContext.java:486) Exception encountered during context initialization - cancelling refresh attempt

　　org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'dataSource' defined in class path resource [applicationContext.xml]: Could not resolve placeholder 'users' in string value "${users}"; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'users' in string value "${users}"

　　at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:209)

　　at org.springframework.beans.factory.config.PropertyPlaceholderConfigurer.processProperties(PropertyPlaceholderConfigurer.java:223)

　　at org.springframework.beans.factory.config.PropertyResourceConfigurer.postProcessBeanFactory(PropertyResourceConfigurer.java:84)

　　at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:696)

　　at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:671)

　　at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461)

　　at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139)

　　at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:83)

　　at com.javaxyz.test.SpringTest.test9(SpringTest.java:48)

　　at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

　　at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

　　at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

　　at java.lang.reflect.Method.invoke(Method.java:606)

　　at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)

　　at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

　　at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)

　　at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

　　at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)

　　at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)

　　at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)

　　at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)

　　at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)

　　at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)

　　at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)

　　at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)

　　at org.junit.runners.ParentRunner.run(ParentRunner.java:236)

　　at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)

　　at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

　　at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)

　　at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)

　　at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)

　　at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

　　Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'users' in string value "${users}"

　　at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:173)

　　at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:125)

　　at org.springframework.beans.factory.config.PropertyPlaceholderConfigurer$PlaceholderResolvingStringValueResolver.resolveStringValue(PropertyPlaceholderConfigurer.java:258)

　　at org.springframework.beans.factory.config.BeanDefinitionVisitor.resolveStringValue(BeanDefinitionVisitor.java:282)

　　at org.springframework.beans.factory.config.BeanDefinitionVisitor.resolveValue(BeanDefinitionVisitor.java:204)

　　at org.springframework.beans.factory.config.BeanDefinitionVisitor.visitPropertyValues(BeanDefinitionVisitor.java:141)

　　at org.springframework.beans.factory.config.BeanDefinitionVisitor.visitBeanDefinition(BeanDefinitionVisitor.java:82)

　　at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:206)

　　... 31 more

　　- (371 ms) - 2019-10-9 16:34:56[ INFO](DefaultSingletonBeanRegistry.java:444) Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@6a109ac: defining beans [org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0,dataSource,sqlSessionFactory,org.mybatis.spring.mapper.MapperScannerConfigurer#0,userService,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,transactionManager,org.springframework.aop.config.internalAutoProxyCreator,org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0,org.springframework.transaction.interceptor.TransactionInterceptor#0,org.springframework.transaction.config.internalTransactionAdvisor,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor,userMapper]; root of factory hierarchy

　　报错位置：

　　报错原因是配置文件database.properties里用户名的key是user,而不是users

　　user=root