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<BR>import org.springframework.beans.BeansException; <BR>import
org.springframework.context.ApplicationContext; <BR>import
org.springframework.dao.DataAccessException; <BR>import
org.springframework.web.context.support.WebApplicationContextUtils;
<BR><BR>import com.ufida.haisheng.constants.Globals; <BR>import
com.ufida.haisheng.converter.DateConverter; <BR>import
com.ufida.haisheng.converter.TimestampConverter; <BR>import
com.ufida.haisheng.exp.ExceptionDTO; <BR>import
com.ufida.haisheng.exp.ExceptionDisplayDTO; <BR>import
com.ufida.haisheng.exp.exceptionhandler.ExceptionHandlerFactory; <BR>import
com.ufida.haisheng.exp.exceptionhandler.ExceptionUtil; <BR>import
com.ufida.haisheng.exp.exceptionhandler.IExceptionHandler; <BR>import
com.ufida.haisheng.exp.exceptions.BaseAppException; <BR>import
com.ufida.haisheng.exp.exceptions.MappingConfigException; <BR>import
com.ufida.haisheng.exp.exceptions.NoSuchBeanConfigException; <BR><BR>/** <BR>*
系统的Ajax转发基类。增加模版处理异常信息。 <BR>* <BR>* @author <BR>* @desc
BaseDispatchDocumentAction.java <BR>* <BR>* @说明: web 应用基础平台 <BR>* @date
2005-03-02 11:18:01 AM <BR>* @版权所有: All Right Reserved 2006-2008 <BR>*/
<BR>public abstract class BaseDispatchDocumentAction extends Action {
<BR><BR>protected Class clazz = this.getClass(); <BR><BR>protected static Logger
log = Logger.getLogger(BaseDispatchDocumentAction.class); <BR><BR>/** <BR>* 异常信息
<BR>*/ <BR>protected static ThreadLocal<ExceptionDisplayDTO>
expDisplayDetails = new ThreadLocal<ExceptionDisplayDTO>();
<BR><BR>private static final Long defaultLong = null; <BR><BR>private static
ApplicationContext ctx = null; <BR>/** <BR>* 注册转换的工具类 使得From中的string -- <BR>*
Model中的对应的类型(Date,BigDecimal,Timestamp,Double...) <BR>*/ <BR>static {
<BR>ConvertUtils.register(new ClassConverter(), Double.class);
<BR>ConvertUtils.register(new DateConverter(), Date.class);
<BR>ConvertUtils.register(new DateConverter(), String.class);
<BR>ConvertUtils.register(new LongConverter(defaultLong), Long.class);
<BR>ConvertUtils.register(new IntegerConverter(defaultLong), Integer.class);
<BR>ConvertUtils.register(new TimestampConverter(), Timestamp.class);
<BR>ConvertUtils.register(new BigDecimalConverter(defaultLong),
BigDecimal.class); <BR>} <BR><BR>/** <BR>* The message resources for this
package. <BR>*/ <BR>protected static MessageResources messages =
MessageResources.getMessageResources("org.apache.struts.actions.LocalStrings");
<BR><BR>/** <BR>* The set of Method objects we have introspected for this class,
keyed by <BR>* method name. This collection is populated as different methods
are <BR>* called, so that introspection needs to occur only once per method
name. <BR>*/ <BR>protected HashMap<String, Method> methods = new
HashMap<String, Method>(); <BR><BR>/** <BR>* The set of argument type
classes for the reflected method call. These are <BR>* the same for all calls,
so calculate them only once. <BR>*/ <BR>protected Class[] types = {
ActionMapping.class, ActionForm.class, Document.class, HttpServletRequest.class,
<BR>HttpServletResponse.class }; <BR><BR>/** <BR>* Process the specified HTTP
request, and create the corresponding HTTP <BR>* response (or forward to another
web component that will create it). <BR>* Return an
<code>ActionForward</code> instance describing where and how <BR>*
control should be forwarded, or <code>null</code> if the response
has <BR>* already been completed. <BR>* <BR>* @param mapping <BR>* The
ActionMapping used to select this instance <BR>* @param form <BR>* The optional
ActionForm bean for this request (if any) <BR>* @param request <BR>* The HTTP
request we are processing <BR>* @param response <BR>* The HTTP response we are
creating <BR>* <BR>* @exception Exception <BR>* if an exception occurs <BR>*/
<BR>public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, <BR>HttpServletResponse response) throws Exception {
<BR>response.setContentType("text/html; charset=UTF-8"); <BR>ExceptionDisplayDTO
expDTO = null; <BR>try { <BR>Document doc = createDocumentFromRequest(request);
<BR>/* <BR>* 这里直接调用mapping的parameter配置 <BR>*/ <BR>String actionMethod =
mapping.getParameter(); <BR>/* <BR>* 校验配置的方法是否正确、有效 <BR>*/
<BR>isValidMethod(actionMethod); <BR><BR>return dispatchMethod(mapping, form,
doc, request, response, actionMethod); <BR>} catch (BaseAppException ex) {
<BR>expDTO = handlerException(request, response, ex); <BR>} catch (Exception ex)
{ <BR>ExceptionUtil.logException(this.getClass(), ex);
<BR>renderText(response,"[Error :对不起,系统出现错误了,请向管理员报告以下异常信息.\n" + ex.getMessage()
+ "]"); <BR>request.setAttribute(Globals.ERRORMSG,
"对不起,系统出现错误了,请向管理员报告以下异常信息.\n" + ex.getMessage()); <BR>expDTO =
handlerException(request,response, ex); <BR>} finally {
<BR>expDisplayDetails.set(null); <BR>} <BR>return null == expDTO ? null :
(expDTO.getActionForwardName() == null ? null :
mapping.findForward(expDTO.getActionForwardName())); <BR>} <BR><BR>/** <BR>*
直接输出纯字符串 <BR>*/ <BR>public void renderText(HttpServletResponse response, String
text) { <BR>PrintWriter out = null; <BR>try { <BR>out = response.getWriter();
<BR>response.setContentType("text/plain;charset=UTF-8"); <BR>out.write(text);
<BR>} catch (IOException e) { <BR>log.error(e); <BR>} finally { <BR>if (out !=
null) { <BR>out.flush(); <BR>out.close(); <BR>out = null; <BR>} <BR>} <BR>}
<BR><BR>/** <BR>* 直接输出纯HTML <BR>*/ <BR>public void
renderHtml(HttpServletResponse response, String text) { <BR>PrintWriter out =
null; <BR>try { <BR>out = response.getWriter();
<BR>response.setContentType("text/html;charset=UTF-8"); <BR>out.write(text);
<BR>} catch (IOException e) { <BR>log.error(e); <BR>} finally { <BR>if (out !=
null) { <BR>out.flush(); <BR>out.close(); <BR>out = null; <BR>} <BR>} <BR>}
<BR><BR>/** <BR>* 直接输出纯XML <BR>*/ <BR>public void renderXML(HttpServletResponse
response, String text) { <BR>PrintWriter out = null; <BR>try { <BR>out =
response.getWriter(); <BR>response.setContentType("text/xml;charset=UTF-8");
<BR>out.write(text); <BR>} catch (IOException e) { <BR>log.error(e); <BR>}
finally { <BR>if (out != null) { <BR>out.flush(); <BR>out.close(); <BR>out =
null; <BR>} <BR>} <BR>} <BR><BR>/** <BR>* 异常处理 <BR>* @param request <BR>* @param
out <BR>* @param ex <BR>* @return ExceptionDisplayDTO异常描述对象 <BR>*/ <BR>private
ExceptionDisplayDTO handlerException(HttpServletRequest
request,HttpServletResponse response, Exception ex) { <BR>ExceptionDisplayDTO
expDTO = (ExceptionDisplayDTO) expDisplayDetails.get(); <BR>if (null == expDTO)
{ <BR>expDTO = new ExceptionDisplayDTO(null,this.getClass().getName()); <BR>}
<BR>IExceptionHandler expHandler =
ExceptionHandlerFactory.getInstance().create(); <BR>ExceptionDTO exDto =
expHandler.handleException(expDTO.getContext(), ex);
<BR>request.setAttribute("ExceptionDTO", exDto);
<BR>renderText(response,"[Error:" + (exDto == null ? "ExceptionDTO is
null,请检查expinfo.xml配置文件." : exDto.getMessageCode()) <BR>+ "]"); <BR>return
expDTO; <BR>} <BR><BR>private void isValidMethod(String actionMethod) throws
MappingConfigException { <BR>if (actionMethod == null ||
"execute".equals(actionMethod) || "perform".equals(actionMethod)) {
<BR>log.error("[BaseDispatchAction->error] parameter = " + actionMethod);
<BR>expDisplayDetails.set(new ExceptionDisplayDTO(null,
"MappingConfigException")); <BR>throw new MappingConfigException("对不起,配置的方法名不能为
" + actionMethod); <BR>} <BR>} <BR><BR>/** <BR>* 解析xml流 <BR>* @param request
<BR>* @return Document对象 <BR>*/ <BR>protected static Document
createDocumentFromRequest(HttpServletRequest request) throws Exception { <BR>try
{ <BR>request.setCharacterEncoding("UTF-8"); <BR>Document document = null;
<BR>SAXReader reader = new SAXReader(); <BR>document =
reader.read(request.getInputStream()); <BR>return document; <BR>} catch
(Exception ex) { <BR>log.warn("TIPS：没有提交获取XML格式数据流! "); <BR>return null; <BR>}
<BR>} <BR><BR>/** <BR>* Dispatch to the specified method. <BR>* <BR>* @since
Struts 1.1 <BR>*/ <BR>protected ActionForward dispatchMethod(ActionMapping
mapping, ActionForm form, Document doc,HttpServletRequest request,
HttpServletResponse response, String name) throws Exception { <BR>Method method
= null; <BR>try { <BR>method = getMethod(name); <BR>} catch
(NoSuchMethodException e) { <BR>String message =
messages.getMessage("dispatch.method", mapping.getPath(), name);
<BR>log.error(message, e); <BR>expDisplayDetails.set(new
ExceptionDisplayDTO(null, "MappingConfigException")); <BR>throw new
MappingConfigException(message, e); <BR>} <BR><BR>ActionForward forward = null;
<BR>try { <BR>Object args[] = { mapping, form, doc, request, response };
<BR>log.debug("[execute-begin] -> " + mapping.getPath() + "->[" +
clazz.getName() + "->" + name + "]"); <BR>forward = (ActionForward)
method.invoke(this, args); <BR>log.debug(" [execute-end] -> " + (null ==
forward ? "use ajax send to html/htm" : forward.getPath())); <BR>} catch
(ClassCastException e) { <BR>String message =
messages.getMessage("dispatch.return", mapping.getPath(), name);
<BR>log.error(message, e); <BR>throw new BaseAppException(message, e); <BR><BR>}
catch (IllegalAccessException e) { <BR>String message =
messages.getMessage("dispatch.error", mapping.getPath(), name);
<BR>log.error(message, e); <BR>throw new BaseAppException(message, e); <BR><BR>}
catch (InvocationTargetException e) { <BR>Throwable t = e.getTargetException();
<BR>String message = messages.getMessage("dispatch.error", mapping.getPath(),
name); <BR>throw new BaseAppException(message, t); <BR>} <BR><BR>return
(forward); <BR>} <BR><BR>/** <BR>* Introspect the current class to identify a
method of the specified name <BR>* that accepts the same parameter types as the
<code>execute</code> <BR>* method does. <BR>* <BR>* @param name
<BR>* Name of the method to be introspected <BR>* <BR>* @exception
NoSuchMethodException <BR>* if no such method can be found <BR>*/ <BR>protected
Method getMethod(String name) throws NoSuchMethodException { <BR>synchronized
(methods) { <BR>Method method = (Method) methods.get(name); <BR>if (method ==
null) { <BR>method = clazz.getMethod(name, types); <BR>methods.put(name,
method); <BR>} <BR>return (method); <BR>} <BR>} <BR><BR>/** <BR>* 返回spring
bean对象 <BR>* @param name Spring Bean的名称 <BR>* @exception BaseAppException <BR>*/
<BR>protected Object getSpringBean(String name) throws BaseAppException { <BR>if
(ctx == null) { <BR>ctx =
WebApplicationContextUtils.getWebApplicationContext(this.getServlet().getServletContext());
<BR>} <BR>Object bean = null; <BR>try { <BR>bean = ctx.getBean(name); <BR>}
catch (BeansException ex) { <BR>throw new
NoSuchBeanConfigException("对不起,您没有配置名为:" + name + "的bean。请检查配置文件!",
ex.getRootCause()); <BR>} <BR>if (null == bean) { <BR>throw new
NoSuchBeanConfigException("对不起,您没有配置名为:" + name + "的bean。请检查配置文件!"); <BR>}
<BR>return bean; <BR>} <BR>} <BR><BR><BR>开发人员只需要继承它就可以了，我们写个简单的示例action，如下：
<BR><BR>代码 <BR>/** <BR>* 带Ajax提交xml数据的action类模版 <BR>* <BR>* @author 陈志平 chenzp
<BR>* <BR>* @说明: web 应用基础平台 <BR>* @date Aug 1, 2006 10:52:13 AM <BR>* @版权所有: All
Right Reserved 2006-2008 <BR>*/ <BR>public class UserAction extends
BaseDispatchDocumentAction { <BR>/** <BR>* 这里 actionForm 和 doc
参数必有一个为空，请聪明的你分析一下 <BR>* @param mapping --转发的映射对象 <BR><span
style="color:blue;">* @param actionForm --仍然支持表单提交，此时doc == null <BR>* @param
doc document对象，解析xml后的文档对象</span> <BR>* @param request --请求 <BR>* @param
response --响应 <BR>*/ <BR>public ActionForward list(ActionMapping mapping,
ActionForm actionForm, <span style="color:red;">Document
doc</span>,HttpServletRequest request, HttpServletResponse response)
throws BaseAppException { <BR>/** <BR>* 转发的名称 userAction.search: 系统上下文 用于异常处理
<BR>*/ <BR>expDisplayDetails.set(new ExceptionDisplayDTO(null,
"userAction.search")); <BR>/** <BR>* 处理业务逻辑部分： <BR>* <BR>* 获取各种类型的参数
RequestUtil.getStrParameter(request,"ParameterName"); <BR>* <BR>* 调用父类的
getSpringBean("serviceID")方法获取spring的配置bean <BR>* <BR>*/ <BR>UserManager
userManager = (LogManager) getSpringBean("userManager"); <BR>//返回xml对象到前台
<BR>renderXML(response, userManager.findUsersByDoc(doc))； return null; <BR>}
<BR><BR><BR>至此，我们成功实现了ajax--struts--spring的无缝结合。欢迎大家拍砖！ </DIV>
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<LI>分类: <A href="http://zhangljerry.javaeye.com/category/9989">web2.0</A>
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<H5>2007-05-24</H5>
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