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  3. 搭建SSH环境会碰见的一些常见的问题！

搭建SSH环境会碰见的一些常见的问题！

mac2022-06-30  24

  本人是小白！  最近因为想多学点东西！所以就准备从SSH入手！想要写一个程序，那么首先就是要配置它的环境！  由于第一次配置环境，出现一些让人头痛的错误！接下来就让小白来一一列出来！   1.建一个工程。导入必要的包！本人是按照一本参考书上面来导入类包的！struts2+spring3+hibernate3.3.   2.接下来就是要配web.xml了！Struts2的配置：<filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>  注意这里一定要记得配<filter-mapping>，不然就会报错！Spring的配置：<listener> <listener-class>org.springframework.web.context.ContextLoaderListener </listener-class> </listener>   3.然后就是配置applicationContext.xml。因为spring和hibernate的集成是Spring通过bean来管理工厂类！所以需要配置<!-- 在Spring中配置Hibernate --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/> <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/> <property name="username" value="scott"/> <property name="password" value="tiger"/> </bean> <!-- session工厂配置 --> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean" destroy-method="destroy"> <property name="dataSource" ref="dataSource"></property> <property name="mappingResources"> <list> <value>com/test/User/User.hbm.xml</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.format_sql">true</prop> </props> </property> </bean>这里面数据库的驱动和连接地址需要按照自己的数据库按需求来写！本人用的是SQL SERVER。4.配置struts.xml文件。这个博主就不再累赘叙述了！一般不会出错！这里只要注意配置前面的******.dtd的书写就OK了。5.现在就写一个登陆demo配置bean来运行下！结果出现了茫茫多的错误！先出现的是呢是下面的错误org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from ServletContext resource [/WEB-INF/applicationContext.xml]; nested exception is java.io.FileNotFoundException: Could not open ServletContext resource [/WEB-INF/applicationContext.xml]就是找不到applicationContext.xml，因为加入applicationContext.xml这个文件你不是放在和src同级下面的话，系统就会去/WEB-INF/applicationContext.xml这个路径去找的！现在有3个办法<1>就是吧applicationContext.xml黏贴到src同级目录下<2>applicationContext.xml放WEB-INF目录下<3>就是在web.xml下面加一个配置项<context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/classes/applicationContext.xml</param-value> </context-param>然后把applicationContext.xml放到src的下级目录中。   4.再次运行又出现了错误！java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener 这个意思就是说找不到这个class文件！原因是一个Spring 3.0 Web Libraries这个包没有加！（坑爹的参考书）   5.加完这个包以后再次运行出现了所谓的界面！登陆框输入东西以后！点击登陆按钮又出现错误了！java.lang.NullPointerException com.test.action.LoginAction.execute(LoginAction.java:34) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:601) com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452) com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254) com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263) org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166) com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187) com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52) org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485) org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77) org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)空指针错误！这怎么会出现！然后博主就默默的去程序里面调试！发现在登陆后运行的这个action注入的对象是null。博主明明都已经在bean中写好了的呀！然后博主又写了一个java程序直接获取bean来输出结果。结果确实这样运行注入就不会错！博主就是小白！也没有联想到可能是struts引起错误！就去找了几个例子来看下！发现他们比咱多一个包！Struts2 Spring Libraries这个包没有引（又是参考书害的）   6.这下该对了吧！但是运行还是出现了java.lang.NoSuchMethodError: antlr.collections.AST.getLine()I 引起这个错误的原因就是是JAR包的冲突struts2的 antlr2.7.2 与hibernate的 antlr2.7.6 冲突删除antlr2.7.2 即可，具体方法：  在MyEclipse下，windows-->preferences-->在文本框中搜索struts2-->选择antlr2.7.2-->remove。接下来一运行！呀对了！终于对了！第一次的SSH之旅就结束了！我自己配置是用myeclipse 10来编写的！

demo在http://pan.baidu.com/share/link?shareid=494386&uk=2687476845

需要的朋友可以去下载！包需要自己引下！

 

转载于:https://www.cnblogs.com/iMouseWu/archive/2013/06/02/3114479.html

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