vonzhou/SpringInAction3 vonzhou/SpringInAction3

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Code of Spring In Action 3rd， Spring学习笔记

Spring In Action

update 2016.8.12 使用freemarker模板引擎

2016.3.31 阅读《Spring实战3rd》

之前间歇的阅读过，但是只是停留在理解的层面上，想要把每个例子跑通也需要一定的折腾。

注：每个示例都是一个单独的Maven Project。

2016.7.12 update

1. Spring之旅

  • 依赖注入
  • AOP
  • bean的初始化过程
  • spring容器
  • Spring还有很多值得学习的框架，如安全

跑起来√ knights

2. 装配Bean

  • “initialization on demand holder”创建单例模式的理解,参考 Initialization-on-demand holder idiom
  • Spring中单例的概念限于Spring上下文中，遵守约定
  • 内部bean适用于setter注入和构造器注入，内部bean不能被复用
  • SpEL表达式

跑起来√ springidol

3. 最小化Spring XML配置

  • 4 种自动装配 byName, byType, contructor, autodetect
  • 可以在一个应用上下文中定义多个配置文件，每个配置文件设置自己的默认自动装配策略(default-autowire)
  • 如果使用constructor自动装配策略，就不能混合使用constructor-arg
  • 注解方式可以实现更细粒度的自动装配，Spring容器默认禁用注解装配，要在配置文件中开启
  • <context:component-scan> 配置自动扫描
  • 在基于Java的配置中使用@Configuration注解的Java类，等价于XML配置中的<beans>元素

跑起来√ springidol-autodiscovery

4. 面向切面Spring

  • Spring只支持方法连接点
  • 体会切面的应用场景
  • before, after, around advice
  • 为advice传递参数
  • introduction为已有的接口引入新接口
  • at aspect

跑起来√ springidol-aop

跑起来√ springidol-aspectj

5. 征服数据库

  • Spring在数据访问层使用模板方法设计模式，模板template管理数据访问过程中固定的部分，回调callback处理自定义的数据访问细节
  • 想要控制的越多就越复杂，更多的冗余逻辑，tradeoff
  • 使用MySQL数据库
  • 体会各种持久化方法的使用

跑起来√ spitter-persistence-jdbc-conventional

跑起来√ spitter-persistence-jdbc-template

跑起来√ spitter-persistence-hibernate-contextual-session

跑起来√ spitter-persistence-jpa

6. 事务管理

  • 事务的ACID特性
  • 编码式 vs 声明式事务在细粒度和易用性之间的权衡
  • Spring为每种场景定义了事务管理器（TransactionManager），底层是特定的事务实现
  • 要理解JDBC事务，Hibernate事务幕后的实现
  • 声明式事务的5个属性：传播行为，隔离级别，只读，超时，回滚规则

跑起来√ spitter-service-declarative-tx

跑起来√ spitter-service-programmatic-tx

7. 使用Spring MVC构建Web应用程序

一个问题的记录，如下，解决方法把Spitter配置文件中的lazy设置为false，还有待好好理解，参考。

org.hibernate.LazyInitializationException: could not initialize proxy - no Session
	org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:148)
	org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:266)
	org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:68)
	com.vonzhou.spitter.persistence.Spitter_$$_jvst34e_0.getUsername(Spitter_$$_jvst34e_0.java)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:497)
	javax.el.BeanELResolver.getValue(BeanELResolver.java:97)
	org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:110)
	org.apache.el.parser.AstValue.getValue(AstValue.java:169)
	org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
	org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:943)
	ohrg.apache.jsp.WEB_002dINF.views.home_jsp._jspx_meth_s_005fparam_005f0(home_jsp.java:317)
	org.apache.jsp.WEB_002dINF.views.home_jsp._jspx_meth_s_005furl_005f0(home_jsp.java:283)
	org.apache.jsp.WEB_002dINF.views.home_jsp._jspx_meth_c_005fforEach_005f0(home_jsp.java:208)
	org.apache.jsp.WEB_002dINF.views.home_jsp._jspService(home_jsp.java:155)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1243)
	org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:968)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:859)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

表单验证效果：

一个问题的记录，如下， 根据日志输出大概可以看出在equals，hashCode方法的地方，所以要正确的override， 可以使用Commons lang。

javax.validation.ValidationException: HV000041: Call to TraversableResolver.isReachable() threw an exception.
	org.hibernate.validator.internal.engine.ValidatorImpl.isReachable(ValidatorImpl.java:1531)
	org.hibernate.validator.internal.engine.ValidatorImpl.isValidationRequired(ValidatorImpl.java:1507)
	org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:584)
	org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:555)
	org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:490)
	org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:454)
	org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:406)
	org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:204)
	org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:108)
	org.springframework.validation.DataBinder.validate(DataBinder.java:866)
	org.springframework.web.method.annotation.ModelAttributeMethodProcessor.validateIfApplicable(ModelAttributeMethodProcessor.java:164)
	org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:111)
	org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:99)
	org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:161)
	org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128)
	org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
	org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:817)
	org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:731)
	org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:968)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:870)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.NullPointerException
	com.vonzhou.spitter.persistence.Spitter.equals(Spitter.java:100)
	org.hibernate.validator.internal.engine.resolver.CachingTraversableResolverForSingleValidation$TraversableHolder.equals(CachingTraversableResolverForSingleValidation.java:127)
	java.util.HashMap.getNode(HashMap.java:571)
	java.util.HashMap.get(HashMap.java:556)
	org.hibernate.validator.internal.engine.resolver.CachingTraversableResolverForSingleValidation.isReachable(CachingTraversableResolverForSingleValidation.java:34)
	org.hibernate.validator.internal.engine.ValidatorImpl.isReachable(ValidatorImpl.java:1522)
	org.hibernate.validator.internal.engine.ValidatorImpl.isValidationRequired(ValidatorImpl.java:1507)
	org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:584)
	org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:555)
	org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:490)
	org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:454)
	org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:406)
	org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:204)
	org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:108)
	org.springframework.validation.DataBinder.validate(DataBinder.java:866)
	org.springframework.web.method.annotation.ModelAttributeMethodProcessor.validateIfApplicable(ModelAttributeMethodProcessor.java:164)
	org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:111)
	org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:99)
	org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:161)
	org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128)
	org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
	org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:817)
	org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:731)
	org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:968)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:870)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

一个问题的记录，如下，要加入依赖commons fileupload(为何？？), 然后配置文件加入multipartResolver bean.

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:980)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:870)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

一个问题的记录，部署错误，折腾了如何在intellij中配置日志路径，但是没有看到日志在哪儿。采用另一个方法，把项目手动放到tomcat的webapps下面，然后run，出错后，会在其logs下面生成日志，然后去阅读，然后我通过阅读日志发现出的错误和数据库相关，才意识到MySQL么有启动。

参阅学习：

http://blogs.sourceallies.com/2011/08/spring-injection-with-resource-and-autowired/

Apache Tiles

Chapter 15. Criteria Queries

application/x-www-form-urlencoded or multipart/form-data?

了解 HSL 语法

Commons IO

What issues should be considered when overriding equals and hashCode in Java?

跑起来√spitter-web

8. Spring Web Flow使用

错误如下，关键在于var要在input之前，input之后就开始各种状态了。

org.xml.sax.SAXParseException; lineNumber: 8; columnNumber: 96; cvc-complex-type.2.4.a: 发现了以元素 'var' 开头的无效内容。应以 '{"http://www.springframework.org/schema/webflow":input, "http://www.springframework.org/schema/webflow":on-start, "http://www.springframework.org/schema/webflow":action-state, "http://www.springframework.org/schema/webflow":view-state, "http://www.springframework.org/schema/webflow":decision-state, "http://www.springframework.org/schema/webflow":subflow-state, "http://www.springframework.org/schema/webflow":end-state, "http://www.springframework.org/schema/webflow":global-transitions, "http://www.springframework.org/schema/webflow":on-end, "http://www.springframework.org/schema/webflow":output, "http://www.springframework.org/schema/webflow":exception-handler, "http://www.springframework.org/schema/webflow":bean-import}' 之一开头。
	com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
	com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
	com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396)
	com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
	com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:284)
	com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:452)

参阅学习：

跑起来√ Spizza

9. 保护Spring应用

  • 登录表单的提交action的url要和security配置中form-login的login-processing-url对应起来，否则谁知道怎么处理
  • 关于CSRF的一点总结，首先要在form里面配置一个csrf的隐藏域因为Spring默认开启了csrf防护，否则Invalid CSRF Token 'null' was found on the request parameter '_csrf' or header 'X-CSRF-TOKEN'.
  • 注意login表单中的用户名和密码input的name不能是默认的j_username, 发生了Invalid CSRF Token的问题，我不知道为何。书中的代码怎么通过的？我在这里迷失了很久！解决的方法就是在security配置中的form-login中显示的指定username-parameter="username", password-parameter="password". login.jsp中保持和这里的一致。
  • 书中对该框架的讲解只是抛砖引玉，需要自己深入学习

一个问题的记录，当security配置文件中配置两个access ROLE的时候就会出现重定向次数太多的错误，对应这种场景必定有解决方法，这里先配置一种ROLE。

参阅学习：

跑起来√ spitter-web-security

10. 使用远程服务

  • 先要保证不用Spring的时候这些RPC的基本使用和原理，否则框架会蒙蔽你的脑子
  • 在阅读Oracle的rmi文档的时候，感觉很爽啊，有时间多看看这些原汁原味的文档，收获自然不菲
  • java -cp 参数的多个路径用冒号分隔，. 代码当前目录
  • 实现一个简单的RMI示例，Java RMI tutorial没有跑通。如果出现LocateRegistry.createRegistry()绑定默认的1099端口失败，那么就先杀死他，然后启动rmiregistry，如下：

  • 简单示例GreetingService中, 通过rmi 方法调用返回的是String对象,String显然实现了java.io.java.io.Serializable，在这里问题UnmarshalException->NotSerializableException就出现在远程方法调用返回的是Spitter对象,所以就要牵扯到对象从RMI server传输到本地,所以Spitter要实现Serializable
  • 根据出现的 UnmarshalException 的 ClassNotFoundException 的类的包名，还可以发现一个问题， Spitter对象是在远程获得的，所以需要load到本地，所以包名也要一致，否则就属于不同的Spitter啊。
  • 纯粹的使用Hessian, 然后整合到Spring中 示例 hello-hessian-spring 。Spring 并没有做更多的简化，只是集成。

参阅学习：

跑起来√ spitter-remoting-rmi

跑起来√ hello-hessian 整合到Spring中, hello-hessian-spring, hello-hessian-spring-client。

跑起来√ hello-httpinvoker

11. 为Spring添加REST功能

  • 理解REST的基本哲学
  • 处理RESTful的URL，写对应的控制器
  • HTTP各种方法的理解
  • 使用RestTemplate
  • 编写REST客户端，以及HttpMessageConverter对客户端的适应
  • component-scan中的多个package使用逗号分隔
  • Fuck, 以后尽量手动的mvn clean pakcage， 然后用IDE部署运行，否则有些问题。

跑起来√ spitter-web-rest

12. Spring消息

  • 之前在阿里实习的时候，对RocketMQ有过较为深入的阅读
  • ActiveMQ的使用，先要下载，启动broker，作为消息生产者消费者之间的代理

  • This class is not trusted to be serialized as ObjectMessage payload. 使用ObjectMessage的时候需要设置信任的package
Caused by: java.lang.ClassNotFoundException: Forbidden class org.springframework.remoting.support.RemoteInvocation! This class is not trusted to be serialized as ObjectMessage payload. Please take a look at http://activemq.apache.org/objectmessage.html for more information on how to configure trusted classes.
	at org.apache.activemq.util.ClassLoadingAwareObjectInputStream.checkSecurity(ClassLoadingAwareObjectInputStream.java:112)
	at org.apache.activemq.util.ClassLoadingAwareObjectInputStream.resolveClass(ClassLoadingAwareObjectInputStream.java:57)
	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1613)
	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
	at org.apache.activemq.command.ActiveMQObjectMessage.getObject(ActiveMQObjectMessage.java:206)
	... 14 more

简单起见设置为：

System.setProperty("org.apache.activemq.SERIALIZABLE_PACKAGES","*");

参阅学习：

ActiveMQ ObjectMessage

跑起来√ messaging

13. 将Spring Bean导出为MBean

  • 前提是理解JMX，看文档

14. 其他Spring技巧

  • 将一些需要修改的配置细节外部化一个单独的配置文件，系统文件，或环境变量中
  • JavaMailSender
  • 调度任务

迷失

Spring旅程才刚刚开始！

vonzhou 2016.4.26

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