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zhipingch 原創(chuàng)

    去年初，正好負(fù)責(zé)一個(gè)醫(yī)藥信息系統(tǒng)的設(shè)計(jì)開(kāi)發(fā)，架構(gòu)設(shè)計(jì)時(shí)，采用Struts+JDBC（自定義采用適配器模式封裝了HashMap動(dòng)態(tài)VO實(shí)現(xiàn)的持久層）。后來(lái)ajax熱潮興起，正好系統(tǒng)中有很多地方需要和服務(wù)器端交互數(shù)據(jù)，如采購(gòu)銷售系統(tǒng)中的訂單頭/訂單明細(xì)等主從表結(jié)構(gòu)的維護(hù)。
    [color=blue]數(shù)據(jù)交互過(guò)程[/color]，我們考慮采用xml來(lái)組織數(shù)據(jù)結(jié)構(gòu)，更新/保存:前臺(tái)封裝需要的xml，通過(guò)ajax提交---〉action解析xml ---〉改造原有的持久層實(shí)現(xiàn)xml持久化；
    查詢時(shí)：持久層根據(jù)實(shí)際需要返回xml，document對(duì)象，---〉action 處理 --〉前臺(tái)自己封裝js庫(kù)來(lái)解析xml，并刷新部分頁(yè)面。

    ajax:已經(jīng)有很多方法實(shí)現(xiàn)跨瀏覽器的方式，這里只介紹最簡(jiǎn)單的方式，同步模式下提交xmlStr給action（*.do）。

/**
* 將數(shù)據(jù)同步傳遞給后臺(tái)請(qǐng)求url
* @return 返回xmlhttp 響應(yīng)的信息
* @param-url = '/web/module/xxx.do?p1=YY&p2=RR';
* @param-xmlStr：xml格式的字符串 <data><xpath><![CDATA[數(shù)據(jù)信息]]></xpath></data>
* @author zhipingch
* @date 2005-03-17
*/
function sendData(urlStr, xmlStr) {
var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.open("POST", urlStr, false);
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
if (xmlStr) {
xmlhttp.send(xmlStr);
} else {
xmlhttp.send();
}
return xmlhttp.responseXml;
}

    struts中我們擴(kuò)展了Action，實(shí)現(xiàn)了xmlStr轉(zhuǎn)化成document對(duì)象（dom4j），并且完善了轉(zhuǎn)發(fā)方式。如
[quote]
1.DispatchAction
     以一個(gè)Controller響應(yīng)一組動(dòng)作絕對(duì)是Controller界的真理，Struts的DispatchAction同樣可以做到這點(diǎn)。

[list]
<action path="/admin/user" name="userForm" scope="request" parameter="method" validate="false">
    <forward name="list" path="/admin/userList.jsp"/>
</action>
[/list]
    其中parameter="method" 設(shè)置了用來(lái)指定響應(yīng)方法名的url參數(shù)名為method，即/admin/user.do?method=list 將調(diào)用UserAction的public ActionForward list(....) 函數(shù)。

    public ActionForward unspecified(....) 函數(shù)可以指定不帶method方法時(shí)的默認(rèn)方法。[/quote]
    但是這樣需要在url后多傳遞參數(shù)[size=18][color=red]method=list [/color][/size]；并且action節(jié)點(diǎn)配置中的[color=red]parameter="method" [/color]
也沒(méi)有被充分利用，反而覺(jué)得是累贅！

    因此我們直接在BaseDispatchAction中增加xml字符串解析，并充分利用action節(jié)點(diǎn)配置中的[color=red]parameter="targetMethod" [/color]，使得轉(zhuǎn)發(fā)的時(shí)候，action能夠直接轉(zhuǎn)發(fā)到子類的相應(yīng)方法中，減少了url參數(shù)傳遞，增強(qiáng)了配置信息可讀性，方便團(tuán)隊(duì)開(kāi)發(fā)。
    同樣以上述為例，擴(kuò)展后的配置方式如下：
[quote]
<action path="/admin/user" scope="request" [color=red]parameter="list"[/color] validate="false">
    <forward name="list" path="/admin/userList.jsp"/>
</action>
[/quote]
    其中[color=red]parameter="list"[/color] 設(shè)置了用來(lái)指定響應(yīng)url=/admin/user.do的方法名,它將調(diào)用UserAction的public ActionForward list(....) 函數(shù)。
     BaseDispatchDocumentAction 的代碼如下，它做了三件重要的事情：
     1、采用dom4j直接解析xml字符串，并返回document，如果沒(méi)有提交xml數(shù)據(jù)，或者采用form形式提交的話，返回null；
     2、采用模版方法處理系統(tǒng)異常，減少了子類中無(wú)盡的try{...}catch(){...};其中異常處理部分另作描述（你可以暫時(shí)去掉異常處理，實(shí)現(xiàn)xml提交和解析，如果你有興趣，我們可以進(jìn)一步交流）；

3、提供了Spring配置Bean的直接調(diào)用，雖然她沒(méi)有注入那么優(yōu)雅，但是實(shí)現(xiàn)了ajax、struts、spring的結(jié)合。
BaseDispatchDocumentAction 的源碼如下：

package com.ufida.haisheng.struts;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.sql.Timestamp;
import java.util.Date;
import java.util.HashMap;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.converters.BigDecimalConverter;
import org.apache.commons.beanutils.converters.ClassConverter;
import org.apache.commons.beanutils.converters.IntegerConverter;
import org.apache.commons.beanutils.converters.LongConverter;
import org.apache.log4j.Logger;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.util.MessageResources;
import org.dom4j.Document;
import org.dom4j.io.SAXReader;
import org.hibernate.HibernateException;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.dao.DataAccessException;
import org.springframework.web.context.support.WebApplicationContextUtils;
import com.ufida.haisheng.constants.Globals;
import com.ufida.haisheng.converter.DateConverter;
import com.ufida.haisheng.converter.TimestampConverter;
import com.ufida.haisheng.exp.ExceptionDTO;
import com.ufida.haisheng.exp.ExceptionDisplayDTO;
import com.ufida.haisheng.exp.exceptionhandler.ExceptionHandlerFactory;
import com.ufida.haisheng.exp.exceptionhandler.ExceptionUtil;
import com.ufida.haisheng.exp.exceptionhandler.IExceptionHandler;
import com.ufida.haisheng.exp.exceptions.BaseAppException;
import com.ufida.haisheng.exp.exceptions.MappingConfigException;
import com.ufida.haisheng.exp.exceptions.NoSuchBeanConfigException;
/**
* 系統(tǒng)的Ajax轉(zhuǎn)發(fā)基類。增加模版處理異常信息。
*
* @author 陳志平 chenzp
* @desc BaseDispatchDocumentAction.java
*
* @說(shuō)明: web 應(yīng)用基礎(chǔ)平臺(tái)
* @date 2005-03-02 11:18:01 AM
* @版權(quán)所有: All Right Reserved 2006-2008
*/
public abstract class BaseDispatchDocumentAction extends Action {
protected Class clazz = this.getClass();
protected static Logger log = Logger.getLogger(BaseDispatchDocumentAction.class);
/**
* 異常信息
*/
protected static ThreadLocal<ExceptionDisplayDTO>
expDisplayDetails = new ThreadLocal<ExceptionDisplayDTO>();
private static final Long defaultLong = null;
private static ApplicationContext ctx = null;
/**
* 注冊(cè)轉(zhuǎn)換的工具類使得From中的string --
* Model中的對(duì)應(yīng)的類型(Date,BigDecimal,Timestamp,Double...)
*/
static {
ConvertUtils.register(new ClassConverter(), Double.class);
ConvertUtils.register(new DateConverter(), Date.class);
ConvertUtils.register(new DateConverter(), String.class);
ConvertUtils.register(new LongConverter(defaultLong), Long.class);
ConvertUtils.register(new IntegerConverter(defaultLong), Integer.class);
ConvertUtils.register(new TimestampConverter(), Timestamp.class);
ConvertUtils.register(new BigDecimalConverter(defaultLong), BigDecimal.class);
}
/**
* The message resources for this package.
*/
protected static MessageResources messages = MessageResources.getMessageResources("org.apache.struts.actions.LocalStrings");
/**
* The set of Method objects we have introspected for this class, keyed by
* method name. This collection is populated as different methods are
* called, so that introspection needs to occur only once per method name.
*/
protected HashMap<String, Method> methods = new HashMap<String, Method>();
/**
* The set of argument type classes for the reflected method call. These are
* the same for all calls, so calculate them only once.
*/
protected Class[] types = { ActionMapping.class, ActionForm.class, Document.class, HttpServletRequest.class,
HttpServletResponse.class };
/**
* Process the specified HTTP request, and create the corresponding HTTP
* response (or forward to another web component that will create it).
* Return an <code>ActionForward</code> instance describing where and how
* control should be forwarded, or <code>null</code> if the response has
* already been completed.
*
* @param mapping
* The ActionMapping used to select this instance
* @param form
* The optional ActionForm bean for this request (if any)
* @param request
* The HTTP request we are processing
* @param response
* The HTTP response we are creating
*
* @exception Exception
* if an exception occurs
*/
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception {
response.setContentType("text/html; charset=UTF-8");
ExceptionDisplayDTO expDTO = null;
try {
Document doc = createDocumentFromRequest(request);
/*
* 這里直接調(diào)用mapping的parameter配置
*/
String actionMethod = mapping.getParameter();
/*
* 校驗(yàn)配置的方法是否正確、有效
*/
isValidMethod(actionMethod);
return dispatchMethod(mapping, form, doc, request, response, actionMethod);
} catch (BaseAppException ex) {
expDTO = handlerException(request, response, ex);
} catch (Exception ex) {
ExceptionUtil.logException(this.getClass(), ex);
renderText(response,"[Error :對(duì)不起,系統(tǒng)出現(xiàn)錯(cuò)誤了,請(qǐng)向管理員報(bào)告以下異常信息." + ex.getMessage() + "]");
request.setAttribute(Globals.ERRORMSG, "對(duì)不起,系統(tǒng)出現(xiàn)錯(cuò)誤了,請(qǐng)向管理員報(bào)告以下異常信息." + ex.getMessage());
expDTO = handlerException(request,response, ex);
} finally {
expDisplayDetails.set(null);
}
return null == expDTO ? null : (expDTO.getActionForwardName() == null ? null : mapping.findForward(expDTO.getActionForwardName()));
}
/**
* 直接輸出純字符串
*/
public void renderText(HttpServletResponse response, String text) {
PrintWriter out = null;
try {
out = response.getWriter();
response.setContentType("text/plain;charset=UTF-8");
out.write(text);
} catch (IOException e) {
log.error(e);
} finally {
if (out != null) {
out.flush();
out.close();
out = null;
}
}
}
/**
* 直接輸出純HTML
*/
public void renderHtml(HttpServletResponse response, String text) {
PrintWriter out = null;
try {
out = response.getWriter();
response.setContentType("text/html;charset=UTF-8");
out.write(text);
} catch (IOException e) {
log.error(e);
} finally {
if (out != null) {
out.flush();
out.close();
out = null;
}
}
}
/**
* 直接輸出純XML
*/
public void renderXML(HttpServletResponse response, String text) {
PrintWriter out = null;
try {
out = response.getWriter();
response.setContentType("text/xml;charset=UTF-8");
out.write(text);
} catch (IOException e) {
log.error(e);
} finally {
if (out != null) {
out.flush();
out.close();
out = null;
}
}
}
/**
* 異常處理
* @param request
* @param out
* @param ex
* @return ExceptionDisplayDTO異常描述對(duì)象
*/
private ExceptionDisplayDTO handlerException(HttpServletRequest request,HttpServletResponse response, Exception ex) {
ExceptionDisplayDTO expDTO = (ExceptionDisplayDTO) expDisplayDetails.get();
if (null == expDTO) {
expDTO = new ExceptionDisplayDTO(null,this.getClass().getName());
}
IExceptionHandler expHandler = ExceptionHandlerFactory.getInstance().create();
ExceptionDTO exDto = expHandler.handleException(expDTO.getContext(), ex);
request.setAttribute("ExceptionDTO", exDto);
renderText(response,"[Error:" + (exDto == null ? "ExceptionDTO is null,請(qǐng)檢查expinfo.xml配置文件." : exDto.getMessageCode())
+ "]");
return expDTO;
}
private void isValidMethod(String actionMethod) throws MappingConfigException {
if (actionMethod == null || "execute".equals(actionMethod) || "perform".equals(actionMethod)) {
log.error("[BaseDispatchAction->error] parameter = " + actionMethod);
expDisplayDetails.set(new ExceptionDisplayDTO(null, "MappingConfigException"));
throw new MappingConfigException("對(duì)不起,配置的方法名不能為 " + actionMethod);
}
}
/**
* 解析xml流
* @param request
* @return Document對(duì)象
*/
protected static Document createDocumentFromRequest(HttpServletRequest request) throws Exception {
try {
request.setCharacterEncoding("UTF-8");
Document document = null;
SAXReader reader = new SAXReader();
document = reader.read(request.getInputStream());
return document;
} catch (Exception ex) {
log.warn("TIPS：沒(méi)有提交獲取XML格式數(shù)據(jù)流! ");
return null;
}
}
/**
* Dispatch to the specified method.
*
* @since Struts 1.1
*/
protected ActionForward dispatchMethod(ActionMapping mapping, ActionForm form, Document doc,HttpServletRequest request,
HttpServletResponse response, String name) throws Exception {
Method method = null;
try {
method = getMethod(name);
} catch (NoSuchMethodException e) {
String message = messages.getMessage("dispatch.method", mapping.getPath(), name);
log.error(message, e);
expDisplayDetails.set(new ExceptionDisplayDTO(null, "MappingConfigException"));
throw new MappingConfigException(message, e);
}
ActionForward forward = null;
try {
Object args[] = { mapping, form, doc, request, response };
log.debug("[execute-begin] -> " + mapping.getPath() + "->[" + clazz.getName() + "->" + name + "]");
forward = (ActionForward) method.invoke(this, args);
log.debug(" [execute-end] -> " + (null == forward ? "use ajax send to html/htm" : forward.getPath()));
} catch (ClassCastException e) {
String message = messages.getMessage("dispatch.return", mapping.getPath(), name);
log.error(message, e);
throw new BaseAppException(message, e);
} catch (IllegalAccessException e) {
String message = messages.getMessage("dispatch.error", mapping.getPath(), name);
log.error(message, e);
throw new BaseAppException(message, e);
} catch (InvocationTargetException e) {
Throwable t = e.getTargetException();
String message = messages.getMessage("dispatch.error", mapping.getPath(), name);
throw new BaseAppException(message, t);
}
return (forward);
}
/**
* Introspect the current class to identify a method of the specified name
* that accepts the same parameter types as the <code>execute</code>
* method does.
*
* @param name
* Name of the method to be introspected
*
* @exception NoSuchMethodException
* if no such method can be found
*/
protected Method getMethod(String name) throws NoSuchMethodException {
synchronized (methods) {
Method method = (Method) methods.get(name);
if (method == null) {
method = clazz.getMethod(name, types);
methods.put(name, method);
}
return (method);
}
}
/**
* 返回spring bean對(duì)象
* @param name Spring Bean的名稱
* @exception BaseAppException
*/
protected Object getSpringBean(String name) throws BaseAppException {
if (ctx == null) {
ctx = WebApplicationContextUtils.getWebApplicationContext(this.getServlet().getServletContext());
}
Object bean = null;
try {
bean = ctx.getBean(name);
} catch (BeansException ex) {
throw new NoSuchBeanConfigException("對(duì)不起,您沒(méi)有配置名為:" + name + "的bean。請(qǐng)檢查配置文件!", ex.getRootCause());
}
if (null == bean) {
throw new NoSuchBeanConfigException("對(duì)不起,您沒(méi)有配置名為:" + name + "的bean。請(qǐng)檢查配置文件!");
}
return bean;
}
}

開(kāi)發(fā)人員只需要繼承它就可以了，我們寫個(gè)簡(jiǎn)單的示例action，如下：

/**
* 帶Ajax提交xml數(shù)據(jù)的action類模版
*
* @author 陳志平 chenzp
*
* @說(shuō)明: web 應(yīng)用基礎(chǔ)平臺(tái)
* @date Aug 1, 2006 10:52:13 AM
* @版權(quán)所有: All Right Reserved 2006-2008
*/
public class UserAction extends BaseDispatchDocumentAction {
/**
* 這里 actionForm 和 doc 參數(shù)必有一個(gè)為空，請(qǐng)聰明的你分析一下
* @param mapping --轉(zhuǎn)發(fā)的映射對(duì)象
[color=blue]* @param actionForm --仍然支持表單提交，此時(shí)doc == null
* @param doc document對(duì)象，解析xml后的文檔對(duì)象[/color]
* @param request --請(qǐng)求
* @param response --響應(yīng)
*/
public ActionForward list(ActionMapping mapping, ActionForm actionForm, [color=red]Document doc[/color],HttpServletRequest request, HttpServletResponse response) throws BaseAppException {
/**
* 轉(zhuǎn)發(fā)的名稱 userAction.search: 系統(tǒng)上下文用于異常處理
*/
expDisplayDetails.set(new ExceptionDisplayDTO(null, "userAction.search"));
/**
* 處理業(yè)務(wù)邏輯部分：
*
* 獲取各種類型的參數(shù) RequestUtil.getStrParameter(request,"ParameterName");
*
* 調(diào)用父類的 getSpringBean("serviceID")方法獲取spring的配置bean
*
*/
UserManager userManager = (LogManager) getSpringBean("userManager");
//返回xml對(duì)象到前臺(tái)
renderXML(response, userManager.findUsersByDoc(doc))；
return null;
}

至此，我們成功實(shí)現(xiàn)了ajax--struts--spring的無(wú)縫結(jié)合，下次介紹spring的開(kāi)發(fā)應(yīng)用。歡迎大家拍磚！

package com.ufida.haisheng.struts;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.sql.Timestamp;
import java.util.Date;
import java.util.HashMap;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.converters.BigDecimalConverter;
import org.apache.commons.beanutils.converters.ClassConverter;
import org.apache.commons.beanutils.converters.IntegerConverter;
import org.apache.commons.beanutils.converters.LongConverter;
import org.apache.log4j.Logger;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.util.MessageResources;
import org.dom4j.Document;
import org.dom4j.io.SAXReader;
import org.hibernate.HibernateException;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.dao.DataAccessException;
import org.springframework.web.context.support.WebApplicationContextUtils;
import com.ufida.haisheng.constants.Globals;
import com.ufida.haisheng.converter.DateConverter;
import com.ufida.haisheng.converter.TimestampConverter;
import com.ufida.haisheng.exp.ExceptionDTO;
import com.ufida.haisheng.exp.ExceptionDisplayDTO;
import com.ufida.haisheng.exp.exceptionhandler.ExceptionHandlerFactory;
import com.ufida.haisheng.exp.exceptionhandler.ExceptionUtil;
import com.ufida.haisheng.exp.exceptionhandler.IExceptionHandler;
import com.ufida.haisheng.exp.exceptions.BaseAppException;
import com.ufida.haisheng.exp.exceptions.MappingConfigException;
import com.ufida.haisheng.exp.exceptions.NoSuchBeanConfigException;
/**
* 系統(tǒng)的Ajax轉(zhuǎn)發(fā)基類。增加模版處理異常信息。
*
* @author 陳志平 chenzp
* @desc BaseDispatchDocumentAction.java
*
* @說(shuō)明: web 應(yīng)用基礎(chǔ)平臺(tái)
* @date 2005-03-02 11:18:01 AM
*/
public abstract class BaseDispatchDocumentAction extends Action {
protected Class clazz = this.getClass();
protected static Logger log = Logger.getLogger(BaseDispatchDocumentAction.class);
/**
* 異常信息
*/
protected static ThreadLocal<ExceptionDisplayDTO>
expDisplayDetails = new ThreadLocal<ExceptionDisplayDTO>();
private static final Long defaultLong = null;
private static ApplicationContext ctx = null;
/**
* 注冊(cè)轉(zhuǎn)換的工具類使得From中的string --
* Model中的對(duì)應(yīng)的類型(Date,BigDecimal,Timestamp,Double...)
*/
static {
ConvertUtils.register(new ClassConverter(), Double.class);
ConvertUtils.register(new DateConverter(), Date.class);
ConvertUtils.register(new DateConverter(), String.class);
ConvertUtils.register(new LongConverter(defaultLong), Long.class);
ConvertUtils.register(new IntegerConverter(defaultLong), Integer.class);
ConvertUtils.register(new TimestampConverter(), Timestamp.class);
ConvertUtils.register(new BigDecimalConverter(defaultLong), BigDecimal.class);
}
/**
* The message resources for this package.
*/
protected static MessageResources messages = MessageResources.getMessageResources("org.apache.struts.actions.LocalStrings");
/**
* The set of Method objects we have introspected for this class, keyed by
* method name. This collection is populated as different methods are
* called, so that introspection needs to occur only once per method name.
*/
protected HashMap<String, Method> methods = new HashMap<String, Method>();
/**
* The set of argument type classes for the reflected method call. These are
* the same for all calls, so calculate them only once.
*/
protected Class[] types = { ActionMapping.class, ActionForm.class, Document.class, HttpServletRequest.class,
HttpServletResponse.class };
/**
* Process the specified HTTP request, and create the corresponding HTTP
* response (or forward to another web component that will create it).
* Return an <code>ActionForward</code> instance describing where and how
* control should be forwarded, or <code>null</code> if the response has
* already been completed.
*
* @param mapping
* The ActionMapping used to select this instance
* @param form
* The optional ActionForm bean for this request (if any)
* @param request
* The HTTP request we are processing
* @param response
* The HTTP response we are creating
*
* @exception Exception
* if an exception occurs
*/
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception {
response.setContentType("text/html; charset=UTF-8");
ExceptionDisplayDTO expDTO = null;
try {
Document doc = createDocumentFromRequest(request);
/*
* 這里直接調(diào)用mapping的parameter配置
*/
String actionMethod = mapping.getParameter();
/*
* 校驗(yàn)配置的方法是否正確、有效
*/
isValidMethod(actionMethod);
return dispatchMethod(mapping, form, doc, request, response, actionMethod);
} catch (BaseAppException ex) {
expDTO = handlerException(request, response, ex);
} catch (Exception ex) {
ExceptionUtil.logException(this.getClass(), ex);
renderText(response,"[Error :對(duì)不起,系統(tǒng)出現(xiàn)錯(cuò)誤了,請(qǐng)向管理員報(bào)告以下異常信息." + ex.getMessage() + "]");
request.setAttribute(Globals.ERRORMSG, "對(duì)不起,系統(tǒng)出現(xiàn)錯(cuò)誤了,請(qǐng)向管理員報(bào)告以下異常信息." + ex.getMessage());
expDTO = handlerException(request,response, ex);
} finally {
expDisplayDetails.set(null);
}
return null == expDTO ? null : (expDTO.getActionForwardName() == null ? null : mapping.findForward(expDTO.getActionForwardName()));
}
/**
* 直接輸出純字符串
*/
public void renderText(HttpServletResponse response, String text) {
PrintWriter out = null;
try {
out = response.getWriter();
response.setContentType("text/plain;charset=UTF-8");
out.write(text);
} catch (IOException e) {
log.error(e);
} finally {
if (out != null) {
out.flush();
out.close();
out = null;
}
}
}
/**
* 直接輸出純HTML
*/
public void renderHtml(HttpServletResponse response, String text) {
PrintWriter out = null;
try {
out = response.getWriter();
response.setContentType("text/html;charset=UTF-8");
out.write(text);
} catch (IOException e) {
log.error(e);
} finally {
if (out != null) {
out.flush();
out.close();
out = null;
}
}
}
/**
* 直接輸出純XML
*/
public void renderXML(HttpServletResponse response, String text) {
PrintWriter out = null;
try {
out = response.getWriter();
response.setContentType("text/xml;charset=UTF-8");
out.write(text);
} catch (IOException e) {
log.error(e);
} finally {
if (out != null) {
out.flush();
out.close();
out = null;
}
}
}
/**
* 異常處理
* @param request
* @param out
* @param ex
* @return ExceptionDisplayDTO異常描述對(duì)象
*/
private ExceptionDisplayDTO handlerException(HttpServletRequest request,HttpServletResponse response, Exception ex) {
ExceptionDisplayDTO expDTO = (ExceptionDisplayDTO) expDisplayDetails.get();
if (null == expDTO) {
expDTO = new ExceptionDisplayDTO(null,this.getClass().getName());
}
IExceptionHandler expHandler = ExceptionHandlerFactory.getInstance().create();
ExceptionDTO exDto = expHandler.handleException(expDTO.getContext(), ex);
request.setAttribute("ExceptionDTO", exDto);
renderText(response,"[Error:" + (exDto == null ? "ExceptionDTO is null,請(qǐng)檢查expinfo.xml配置文件." : exDto.getMessageCode())
+ "]");
return expDTO;
}
private void isValidMethod(String actionMethod) throws MappingConfigException {
if (actionMethod == null || "execute".equals(actionMethod) || "perform".equals(actionMethod)) {
log.error("[BaseDispatchAction->error] parameter = " + actionMethod);
expDisplayDetails.set(new ExceptionDisplayDTO(null, "MappingConfigException"));
throw new MappingConfigException("對(duì)不起,配置的方法名不能為 " + actionMethod);
}
}
/**
* 解析xml流
* @param request
* @return Document對(duì)象
*/
protected static Document createDocumentFromRequest(HttpServletRequest request) throws Exception {
try {
request.setCharacterEncoding("UTF-8");
Document document = null;
SAXReader reader = new SAXReader();
document = reader.read(request.getInputStream());
return document;
} catch (Exception ex) {
log.warn("TIPS：沒(méi)有提交獲取XML格式數(shù)據(jù)流! ");
return null;
}
}
/**
* Dispatch to the specified method.
*
* @since Struts 1.1
*/
protected ActionForward dispatchMethod(ActionMapping mapping, ActionForm form, Document doc,HttpServletRequest request,
HttpServletResponse response, String name) throws Exception {
Method method = null;
try {
method = getMethod(name);
} catch (NoSuchMethodException e) {
String message = messages.getMessage("dispatch.method", mapping.getPath(), name);
log.error(message, e);
expDisplayDetails.set(new ExceptionDisplayDTO(null, "MappingConfigException"));
throw new MappingConfigException(message, e);
}
ActionForward forward = null;
try {
Object args[] = { mapping, form, doc, request, response };
log.debug("[execute-begin] -> " + mapping.getPath() + "->[" + clazz.getName() + "->" + name + "]");
forward = (ActionForward) method.invoke(this, args);
log.debug(" [execute-end] -> " + (null == forward ? "use ajax send to html/htm" : forward.getPath()));
} catch (ClassCastException e) {
String message = messages.getMessage("dispatch.return", mapping.getPath(), name);
log.error(message, e);
throw new BaseAppException(message, e);
} catch (IllegalAccessException e) {
String message = messages.getMessage("dispatch.error", mapping.getPath(), name);
log.error(message, e);
throw new BaseAppException(message, e);
} catch (InvocationTargetException e) {
Throwable t = e.getTargetException();
String message = messages.getMessage("dispatch.error", mapping.getPath(), name);
throw new BaseAppException(message, t);
}
return (forward);
}
/**
* Introspect the current class to identify a method of the specified name
* that accepts the same parameter types as the <code>execute</code>
* method does.
*
* @param name
* Name of the method to be introspected
*
* @exception NoSuchMethodException
* if no such method can be found
*/
protected Method getMethod(String name) throws NoSuchMethodException {
synchronized (methods) {
Method method = (Method) methods.get(name);
if (method == null) {
method = clazz.getMethod(name, types);
methods.put(name, method);
}
return (method);
}
}
/**
* 返回spring bean對(duì)象
* @param name Spring Bean的名稱
* @exception BaseAppException
*/
protected Object getSpringBean(String name) throws BaseAppException {
if (ctx == null) {
ctx = WebApplicationContextUtils.getWebApplicationContext(this.getServlet().getServletContext());
}
Object bean = null;
try {
bean = ctx.getBean(name);
} catch (BeansException ex) {
throw new NoSuchBeanConfigException("對(duì)不起,您沒(méi)有配置名為:" + name + "的bean。請(qǐng)檢查配置文件!", ex.getRootCause());
}
if (null == bean) {
throw new NoSuchBeanConfigException("對(duì)不起,您沒(méi)有配置名為:" + name + "的bean。請(qǐng)檢查配置文件!");
}
return bean;
}
}

請(qǐng)記住本文永久地址:
http://www.javaresource.org/struts/struts-75614.html

posted on 2007-04-19 16:03 蘆葦閱讀(760) 評(píng)論(0) 編輯收藏所屬分類: Spring 、JAVA 、Struts

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