zipkin：HttpClient和struts

　　因为要和老系统集成zipkin，意外的发现老系统使用的httpClient来发送信息。zipkin的官方demo可都是retstTemplate啊！有的搞头。

　　

在看Demo的时候意外的发现其实其实2.5是支持httpClient的，只有到了spring 3之后才是restTemplate；但是我移植到了struts工程之后发现@Autowired的httpClient返回的是NULL；

原来因为在spring的配置文件中的扫描路径有问题。但是改了路径依然没好，这是怎么回事；后来才发现原来报错的是strturs，strtus在分析spring的配置的时候当然报错了。后来单独设置了spring的servlet，再来定义问题解决。

 <servlet>
 　　<servlet-name>action</servlet-name>
 　　<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
 　　<init-param>
 　　　　<param-name>config</param-name>
 　　　　<param-value>/WEB-INF/spring-webmvc-servlet.xml,/WEB-INF/struts-config.xml</param-value>
 　　</init-param>
 　　<load-on-startup>1</load-on-startup>
 </servlet>

这样其实在web容器中其实跑的两套servlet，一套是struts一套是spring，剩下的servlet-mapping的事情了，决定那个路径转向那个servlet；每个servlet代表的一套解决方案，比如spring提供的是容器和挑转方案；struts（是struts 1）提供的跳转方案。那么两套方案是否可以结合，我的目标是容器采用spring，跳转采用struts，结合的时候，发生了一些事情。

org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from ServletContext resource [/WEB-INF/spring-webmvc-servlet.xml]; nested exception is java.lang.IllegalStateException: Context namespace element 'component-scan' and its parser class [org.springframework.context.annotation.ComponentScanBeanDefinitionParser] are only available on JDK 1.5 and higher

但是我的已经是jdk 8的啊。后来看到stackoverflow里面的解释，只能用版本是1.5~1.7；check代码里面只是判断1.5,1.6,1.7，其他版本都被认为是1.4。这是spring里面的一段神判断，其实想想也是有道理，人家写这段代码的时候其实只是到1.7，至于1.8会发生什么无从知晓。

 static {
 　　javaVersion = System.getProperty("java.version");
 　　// version String should look like "1.4.2_10"
 　　if (javaVersion.indexOf("1.7.") != -1) {
 　　　　majorJavaVersion = JAVA_17;
 6　　 }
 　　else if (javaVersion.indexOf("1.6.") != -1) {
 　　　　majorJavaVersion = JAVA_16;
 　　}
 　　else if (javaVersion.indexOf("1.5.") != -1) {
 　　　　majorJavaVersion = JAVA_15;
 　　}
 　　else {
 　　　　// else leave 1.4 as default (it's either 1.4 or unknown)
 　　　　majorJavaVersion = JAVA_14;
 　　}
 }

改了环境变量的路径配置；但是eclipse依然是jdk6，于是关掉elcipse，重启一下，重新读入一下jdk的系统配置；为什么在运行tomcat就不行？因为tomcat环境走的系统的jdk；在elipse里面走的编译是1.6；估计如果是运行其实也是eclipse内部配置；但是tomcat的运行就不行，其实是在eclipse之外跑的。

于是尝试用了eclipse早起的版本，但是本地有的一个Luna版本貌似不是企业版的，没有sServer插件，于是在eclipse里面选择Install New Software...，然后在查询框中输入：

Web、Xml、Java EE and OSGi Enterprise Development

然后根据感觉选择相应的组件即可。

后来换了mars，发现没有Dynamic Web Facts，这次在查询框中输入Web就可以了，根据感觉选就可以了。

 

为什么在struts的action里面就是注入不了呢？

其实不可能成功，spring来管理对象的时候，对于controller类是通过spring的对象池来创建，注入对象，在·DispatcherServlet处理的时候是从object pool中取出之前已经创建好的那个controller供处理请求；但是现在是struts来管理web请求；它是用他的方式来创建Action（相当于spring的controller），当然即使采用spring的声明也不会获取该对象；

 

但是我使用

 WebApplicationContext wac = ContextLoader.getCurrentWebApplicationContext();
 HttpClient httpClient = (HttpClient)wac.getBean("httpClient");

竟然告诉我httpClient没定义！我修改一下log4j的日志级别看看到底咋回事？但是从日志来看应该没问题；

不行，我觉得应该是当前是struts的上下文，即使能够获得ContextLoader，但是此时其实根本就没有WebApplicationContext；后来我改了一种方式：

 ClassPathXmlApplicationContext appContext = new ClassPathXmlApplicationContext(
 new String[] { "applicationContext.xml","spring-webmvc-servlet.xml" });
 BeanFactory factory = (BeanFactory) appContext;
 HttpClient httpClient = (HttpClient)factory.getBean("httpClient");
 //appContext.close();

 return httpClient;

这是在一段单例的对象中获得httpClient；这里有一个注释掉的appContext.close()，因为单例，所以不需要关闭；如果关闭，那么里面AsyncReporter报错，说是已经关闭；所以appContext要保留。这样写终于搞定了，看到zipkin里面有了日志的显示。

虽然讲是sprinig和struts是两套环境，但是其实spring的容器是可以和struts共享的；后来我做了一下测试，在这个工程中配置了spring的servlet-mapping，然后开放了一个类标注为@Controller；发现通过 ContextLoader.getCurrentWebApplicationContext()也是无法获取“httpClient”，但是对象池子这次我特意跟进去，意外的发现对象池里面是有对象的，但是仅限于applicationContext；我其实在web.config里面配置了两个配置文件：spring-webmvc-servlet.xml和applicationContext；但是不知道什么原因只是有application里面出现的对象；后来我把spring-webmvc-servlet.xml里面的bean统一移动到application.xml文件中，发现都有了！这个？难道是spring 2.5的bug吗？我的写法就是最上面那段。

可能是写法有问题，但是不纠结了，而且如果是集中在applicationContext.xml里面定义，struts里面通过ContextLoader.getCurrentWebApplicationContext()也是可以访问到httpClient对象的。

 

但是现在的问题是：感觉没有了portal端的cr和cs，这是怎么回事？

（未解）

 

这一天下来，基本调通；我有一点没想通，为什么获取spring对象费了一些周折，但是Filter过滤器非常成功，因为门户的servlet处理，brave成功抓取发送：

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　　下图是brave-hc-client的信息；因为是sr和sc的，是servlet的brave成功捕获。

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" alt="" width="722" height="100" />

　　这是因为web.xml里面的配置内容是tomcat要处理的内容，和框架无关（init-param里面定义的细节内容除外），比如servlet，filter等这些都是被tomcat使用；所以filter其实是被tomcat执行，和spring无关，于是servlet可以被DelegateFilter成功处理；但是到applicationContext.xml之类文件的处理（在web.xml文件<servlet>节点的configLocation中定义的配置文件路径）就是各个框架的servlet有针对性的处理，形成了差异化。或者讲，web.xml里面定义的都是全局性的东西，还没有到分context（上下文）的阶段；到了后面针对bean的处理就是只能是针对具体框架了。