struts 的 MVC ，自己堆栈跟踪（可以跟着做一遍）

自己做了一个简单的测试Struts2 的MVC流程，并且连接了数据库。需要的包为四个包  commons-logging,ognl,struts2-core,xwork这四个包

当需要连接MySQL数据库的时候需要加包MySQL-connector-java

我们的文件结构为

我们的包加在WEB-INF的lib目录下。web.xml配置在WEB-INF中，在src文件夹里我们有struts.xml配置文件和action实现类

我们的LoginAciton为

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.text.DateFormat;

import java.util.Date;

 

import com.opensymphony.xwork2.ActionSupport;

 

public class LoginAction extends ActionSupport 

{

 

                                 //下面是Action内用于封装用户请求参数的两个属性

                                  private String user;

                                  private String password;

                                  private String name;

                                  //user属性对应的getter方法

                                  public String getuser()

                                 {

                                  return user;

                                  }

                                 //user属性对应的setter方法

                                  public void setuser(String user)

                                  {

                                  this.user = user;

                                  }

                                  //password属性对应的getter方法

                                  public String getPassword()

                                 {

                                  return password;

                                  }

                                 //password属性对应的setter方法

                                  public void setPassword(String password)

                                 {

                                  this.password = password;

                                  }

                                  public String getName() {

                                      return name;

                                   }

 

                                   public void setName(String name) {

                                      this.name = name;

                                   }

                                 //处理用户请求的execute方法

                                 public String execute() throws Exception

                                 {

                                     String ret = ERROR;

                                     Connection conn = null;

                                     try {

                                        String URL = "jdbc:mysql://localhost/struts_tutorial";

                                        Class.forName("com.mysql.jdbc.Driver");

                                        conn = DriverManager.getConnection(URL, "root", "yuanchao");

                                        String sql = "SELECT name FROM login WHERE";

                                        sql+=" user = ? AND password = ?";

                                        PreparedStatement ps = conn.prepareStatement(sql);

                                        ps.setString(1, user);

                                        ps.setString(2, password);

                                        ResultSet rs = ps.executeQuery();

 

                                        while (rs.next()) {

                                           name = rs.getString(1);

                                           ret = SUCCESS;

                                        }

                                     } catch (Exception e) {

                                        ret = ERROR;

                                     } finally {

                                        if (conn != null) {

                                           try {

                                              conn.close();

                                           } catch (Exception e) {

                                           }

                                        }

                                     }

                                     return ret;

 

                                  }

                                  }

 

我们在struts.xml中配置相应动作的action

<struts>

                                 <!-- Struts 2的Action必须放在指定的包空间下定义 -->

                                 <package name="strutsqs" extends="struts-default">

                                    <!-- 定义login的Action，该Action的实现类为lee.Action类 -->

                                  <action name="Login" class="LoginAction">

                                        <!-- 定义处理结果和资源之间映射关系。 -->

                                   <result name="error">/error.jsp</result>

                                   <result name="success">/welcome.jsp</result>        

                                  </action>

                                  </package>

</struts>

我们在web.xml中配置filter

<filter>

        <!-- 定义核心Filter的名称 -->

        <filter-name>struts2</filter-name>

        <!--定义核心Filter的实现类 -->

        <filter-class>

            org.apache.struts2.dispatcher.FilterDispatcher

        </filter-class>

    </filter>

 

    <filter-mapping>

        <!--核心Filter的名称 -->

        <filter-name>struts2</filter-name>

        <!--使用该核心Filter来接受所有的Web请求 -->

        <url-pattern>/*</url-pattern>

    </filter-mapping>

在上述的当用户请求参数的同MySQL数据库中的参数相对应返回成功，否则失败

当然我们可以采用

String user = (String)ActionContext.getContext().getSession().get("user");来获得用户名的属性

 疑问一：getUsername()就可以获得我们表单里的用户名 

堆栈跟踪执行过程   

LoginAction.execute() 

NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39    

DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25    

Method.invoke(Object, Object...) line: 597    

DefaultActionInvocation.invokeAction(Object, ActionConfig) line: 404    

DefaultActionInvocation.invokeActionOnly() line: 267    

DefaultActionInvocation.invoke() line: 229    

DefaultWorkflowInterceptor.doIntercept(ActionInvocation) line: 221    

DefaultWorkflowInterceptor(MethodFilterInterceptor).intercept(ActionInvocation) line: 86    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

AnnotationValidationInterceptor(ValidationInterceptor).doIntercept(ActionInvocation) line: 150    

AnnotationValidationInterceptor.doIntercept(ActionInvocation) line: 48    

AnnotationValidationInterceptor(MethodFilterInterceptor).intercept(ActionInvocation) line: 86    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

StrutsConversionErrorInterceptor(ConversionErrorInterceptor).intercept(ActionInvocation) line: 123    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

ParametersInterceptor.doIntercept(ActionInvocation) line: 167    

ParametersInterceptor(MethodFilterInterceptor).intercept(ActionInvocation) line: 86    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

StaticParametersInterceptor.intercept(ActionInvocation) line: 105    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

CheckboxInterceptor.intercept(ActionInvocation) line: 83    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

FileUploadInterceptor.intercept(ActionInvocation) line: 207    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

ModelDrivenInterceptor.intercept(ActionInvocation) line: 74    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

ScopedModelDrivenInterceptor.intercept(ActionInvocation) line: 127    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

ProfilingActivationInterceptor.intercept(ActionInvocation) line: 107    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

ChainingInterceptor.intercept(ActionInvocation) line: 115    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

I18nInterceptor.intercept(ActionInvocation) line: 143    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

PrepareInterceptor.doIntercept(ActionInvocation) line: 121    

PrepareInterceptor(MethodFilterInterceptor).intercept(ActionInvocation) line: 86    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

ServletConfigInterceptor.intercept(ActionInvocation) line: 170    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

AliasInterceptor.intercept(ActionInvocation) line: 123    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

ExceptionMappingInterceptor.intercept(ActionInvocation) line: 176    

DefaultActionInvocation$2.doProfiling() line: 224    

DefaultActionInvocation$2.doProfiling() line: 223    

UtilTimerStack.profile(String, ProfilingBlock<T>) line: 455    

DefaultActionInvocation.invoke() line: 221    

StrutsActionProxy.execute() line: 50    

Dispatcher.serviceAction(HttpServletRequest, HttpServletResponse, ServletContext, ActionMapping) line: 504    

FilterDispatcher.doFilter(ServletRequest, ServletResponse, FilterChain) line: 423    

ApplicationFilterChain.internalDoFilter(ServletRequest, ServletResponse) line: 244    

ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 210    

StandardWrapperValve.invoke(Request, Response) line: 272    

StandardContextValve.invoke(Request, Response) line: 123    

NonLoginAuthenticator(AuthenticatorBase).invoke(Request, Response) line: 506    

StandardHostValve.invoke(Request, Response) line: 169    

ErrorReportValve.invoke(Request, Response) line: 105    

AccessLogValve.invoke(Request, Response) line: 957    

StandardEngineValve.invoke(Request, Response) line: 118    

CoyoteAdapter.service(Request, Response) line: 438    

返回到登录成功跳转页面 看看上面的执行过程的堆栈 醉了 好在有许多函数是重复调用的 我先挑出来

关于下几篇文章

1 分析上述堆栈

2 分析ActionContext

3 分析ActionContext对应的ThreadLocal

4 查找上述的值传递过程