在Spring2下针对struts1.x框架的简单封装_简单封装struts1-优快云博客

用过Struts1.X的人都知道，代码中经常会遇见如下代码段：

......

public final ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {

........

}

......

通过以下封装，可以：

1.简单execute方法的参数表

2.在执行action的execute方法前后分别提供doPreProcess和doPostProcess方法作为切点，以实现某些特殊要求。

3.一定程度上简化代码，使代码更清晰。

代码如下：

ActionContext.java

DefaultActionContext.java

package com.yycs.common.action; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.springframework.web.context.WebApplicationContext; public class DefaultActionContext implements ActionContext { private ActionForm form; private ActionMapping mapping; private HttpServletRequest request; private HttpServletResponse response; private ServletContext servletContext; private WebApplicationContext applicationContext; public DefaultActionContext(WebApplicationContext applicationContext, ServletContext servletContext, ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response){ this.applicationContext = applicationContext; this.servletContext = servletContext; this.mapping = mapping; this.form = form; this.request = request; this.response = response; } @Override public ActionForward findForward(String name) { return mapping != null ? mapping.findForward(name) : null; } @Override public String getActionPath() { return mapping.getPath(); } @Override public ActionForm getForm() { return form; } @Override public ActionMapping getMapping() { return mapping; } @Override public HttpServletRequest getRequest() { return request; } @Override public HttpServletResponse getResponse() { return response; } @Override public ServletContext getServletContext() { return servletContext; } @Override public HttpSession getSession() { return request != null ? request.getSession() : null; } @Override public HttpSession getSession(boolean create) { return request != null ? request.getSession(create) : null; } @Override public void setForm(ActionForm form) { this.form = form; } @Override public void setMapping(ActionMapping mapping) { this.mapping = mapping; } @Override public void setRequest(HttpServletRequest request) { this.request = request; } @Override public void setResponse(HttpServletResponse response) { this.response = response; } @Override public void setServletContext(ServletContext context) { this.servletContext = context; } @Override public Object getBean(String key, int scope) { switch(scope) { case 1: return getRequestAttribute(key); case 2: return getSessionAttribute(key); case 3: return getApplicationAttribute(key); case 4: return getApplicationContextAttribute(key); } throw new IllegalArgumentException("Invalid scope value:" + scope); } @Override public void setBean(String key, Object object, int scope) { switch(scope) { case 1: getRequest().setAttribute(key, object); break; case 2: getSession().setAttribute(key, object); break; case 3: getServletContext().setAttribute(key, object); break; default: throw new IllegalArgumentException("Invalid scope value:" + scope); } } private Object getRequestAttribute(String key){ return request != null ? request.getAttribute(key) : null; } private Object getSessionAttribute(String key){ if(request == null || request.getSession() == null) return null; return request.getSession().getAttribute(key); } private Object getApplicationAttribute(String key){ return servletContext != null ? servletContext.getAttribute(key) : null; } private Object getApplicationContextAttribute(String key){ return applicationContext != null ? applicationContext.getBean(key) : null; } }

ProcessAction.java

package com.yycs.common.action; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.springframework.web.struts.ActionSupport; public abstract class ProcessAction extends ActionSupport { protected Log log = LogFactory.getLog((this.getClass()).getName()); protected abstract ActionForward doMainProcess(ActionContext context) throws Exception; protected void doPostProcess(ActionContext context) throws Exception { } protected void doPreProcess(ActionContext context) throws Exception { } public final ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { ActionContext context = createActionContext(mapping, form, request, response); try { if (this.log.isDebugEnabled()) { this.log.debug("execute was invoked."); this.log.debug("prefix = "+ mapping.getModuleConfig().getPrefix()); this.log.debug("path = " + mapping.getPath()); this.log.debug("parameter = " + mapping.getParameter()); this.log.debug("input = " + mapping.getInput()); this.log.debug("name = " + mapping.getName()); this.log.debug("scope = " + mapping.getScope()); this.log.debug("type = " + mapping.getType()); this.log.debug("validate = " + mapping.getValidate()); } ActionForward forward = null; HttpSession session = request.getSession(false); synchronized (session.getId().intern()) { doPreProcess(context); forward = doMainProcess(context); doPostProcess(context); } return forward; } catch (Exception e) { this.log.fatal(e.getMessage(), e); throw e; } } private ActionContext createActionContext(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { return new DefaultActionContext(getWebApplicationContext(), getServletContext(), mapping, form, request, response); } }

示例Action如下：

LoginAction.java

package com.yycs.action; import org.apache.struts.action.ActionForward; import com.yycs.common.action.ActionContext; import com.yycs.common.action.ProcessAction; import com.yycs.common.utils.SshaEncrypt; import com.yycs.form.LoginForm; import com.yycs.service.UserService; public class LoginAction extends ProcessAction { private UserService userService; public void setUserService(UserService userService) { this.userService = userService; } @Override public void doPreProcess(ActionContext context) throws Exception { userService.insertUser(); } @Override public ActionForward doMainProcess(ActionContext context) throws Exception { LoginForm loginForm = (LoginForm) context.getForm(); String username = loginForm.getUsername(); String password = loginForm.getPassword(); int ret = userService.selectLogin(username, SshaEncrypt.getInstance().createDigest(password)); if(ret > 0) { return context.findForward("success"); } return context.findForward("error"); } }