如何在保持约定好处的同时将 Struts 约定与 Tiles 集成？
问题是约定会自动将 url-to-action-to-result 链接到 jsp、velocity 和 freemarker 结果。它不希望处理瓷砖结果。
当使用瓦片时，我们通常希望我们的所有 UI 操作（与 json/xml 服务操作相反）都使用瓦片，但这样做我们失去了结果组件的约定并需要使用注释。注释允许我们偏离预期，但在大型应用程序中，当期望使用瓷砖时，这是一个烦恼。进一步的约定允许我们仅通过指定视图来创建操作。我们也希望在使用瓷砖时保留这种好处。为了纠正这个问题，我们需要建立一个约定，将切片结果传递给我们，这样我们就不需要使用注释来将动作绑定到切片结果，并且我们可以继续创建没有动作类的 JSP，这将获得好处约定（无 xml）和瓦片的好处（所有样板都被分解为瓦片）。
如何做到这一点？
这是一个自我回答，以帮助希望解决此问题的其他人
以下是所需的步骤：
以上步骤需要struts.xml中的以下内容
<struts>
<constant name="struts.convention.default.parent.package" value="tiles-package"/>
<bean type="com.opensymphony.xwork2.UnknownHandler" name="tilesUnknownHandler" class="com.kenmcwilliams.tiles.result.TilesUnknownHandler"/>
<package name="tiles-package" extends="convention-default">
<result-types>
<result-type default="true" name="tiles" class="com.kenmcwilliams.tiles.result.TilesResult"/>
</result-types>
</package>
</struts>
自定义结果类型实现：
package com.kenmcwilliams.tiles.result;
import com.opensymphony.xwork2.ActionInvocation;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.dispatcher.ServletDispatcherResult;
import org.apache.tiles.TilesContainer;
import org.apache.tiles.access.TilesAccess;
import org.apache.tiles.request.ApplicationContext;
import org.apache.tiles.request.servlet.ServletRequest;
import org.apache.tiles.request.servlet.ServletUtil;
public class TilesResult extends ServletDispatcherResult {
private static final Logger log = Logger.getLogger(TilesResult.class.getName());
public TilesResult() {
super();
}
public TilesResult(String location) {
super(location);
}
@Override
public void doExecute(String location, ActionInvocation invocation) throws Exception {
//location = "test.definition"; //for test
log.log(Level.INFO, "TilesResult doExecute() location: {0}", location);
//Start simple conventions
//
if (/** tiles && **/location == null) {
String namespace = invocation.getProxy().getNamespace();
String actionName = invocation.getProxy().getActionName();
location = namespace + "#" + actionName + ".jsp"; //Warning forcing extension
log.log(Level.INFO, "TilesResult namespace: {0}", namespace);
log.log(Level.INFO, "TilesResult actionName: {0}", actionName);
log.log(Level.INFO, "TilesResult location: {0}", location);
}
//End simple conventions
setLocation(location);
ServletContext context = ServletActionContext.getServletContext();
ApplicationContext applicationContext = ServletUtil.getApplicationContext(context);
TilesContainer container = TilesAccess.getContainer(applicationContext);
HttpServletRequest request = ServletActionContext.getRequest();
HttpServletResponse response = ServletActionContext.getResponse();
ServletRequest servletRequest = new ServletRequest(applicationContext, request, response);
container.render(location, servletRequest);
}
}
TilesUnknownHandler 实现：
package com.kenmcwilliams.tiles.result;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ObjectFactory;
import com.opensymphony.xwork2.Result;
import com.opensymphony.xwork2.XWorkException;
import com.opensymphony.xwork2.config.Configuration;
import com.opensymphony.xwork2.config.entities.ActionConfig;
import com.opensymphony.xwork2.config.entities.ResultConfig;
import com.opensymphony.xwork2.config.entities.ResultConfig.Builder;
import com.opensymphony.xwork2.inject.Container;
import com.opensymphony.xwork2.inject.Inject;
import flexjson.JSONSerializer;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletContext;
import org.apache.commons.lang.StringUtils;
import org.apache.struts2.convention.ConventionUnknownHandler;
public class TilesUnknownHandler extends ConventionUnknownHandler {
private static final Logger log = Logger.getLogger(TilesUnknownHandler.class.getName());
private static final String conventionBase = "/WEB-INF/content";
@Inject
public TilesUnknownHandler(Configuration configuration, ObjectFactory objectFactory,
ServletContext servletContext, Container container,
@Inject("struts.convention.default.parent.package") String defaultParentPackageName,
@Inject("struts.convention.redirect.to.slash") String redirectToSlash,
@Inject("struts.convention.action.name.separator") String nameSeparator) {
super(configuration, objectFactory, servletContext, container, defaultParentPackageName,
redirectToSlash, nameSeparator);
log.info("Constructed TilesUnknownHandler");
}
@Override
public ActionConfig handleUnknownAction(String namespace, String actionName)
throws XWorkException {
ActionConfig actionConfig;
log.info("TilesUnknownHandler: before handleUnknownAction");
ActionConfig handleUnknownAction = super.handleUnknownAction(namespace, actionName);
log.info("TilesUnknownHandler: after handleUnknownAction, returning with:");
log.log(Level.INFO, "...ActionConfig value: {0}", (new JSONSerializer().serialize(handleUnknownAction)));
log.log(Level.INFO, "Modifying handleUnknowAction result handler");
Map<String, ResultConfig> results = handleUnknownAction.getResults();
ResultConfig resultConfig = results.get("success");
Builder builder = new ResultConfig.Builder("com.opensymphony.xwork2.config.entities.ResultConfig", "com.kenmcwilliams.tiles.result.TilesResult");
Map<String, String> params = resultConfig.getParams();
String tilesResultString = null;
String location = params.get("location");
if (location != null && !location.isEmpty()) {
int length = conventionBase.length();
if(StringUtils.startsWith(location, conventionBase)){
String subString = location.substring(length); //chop off "/WEB-INF/content"
int count = StringUtils.countMatches(subString, "/");//TODO: maybe check for "//", although I don't know why it would be in the string
if (count == 1){//empty namespace
tilesResultString = subString.replaceFirst("/", "#"); //TODO: because I am doing a straight replacement of the last element the else can probably be removed
}else{ //replace the last slash between the namespace and the file with "#"
int lastIndex = subString.lastIndexOf("/");
//subString.substring(lastIndex, lastIndex);
String nameSpace = subString.substring(0, lastIndex);
String file = subString.substring(lastIndex + 1);
tilesResultString = nameSpace + "#" + file;
}
}
}
Map<String, String> myParams = new LinkedHashMap<String, String>();
myParams.put("location", tilesResultString);
builder.addParams(myParams);
ResultConfig build = builder.build();
Map<String, ResultConfig> myMap = new LinkedHashMap<String, ResultConfig>();
myMap.put("success", build);
log.log(Level.INFO, "\n\n...results: {0}\n\n", (new JSONSerializer().serialize(results)));
actionConfig = new ActionConfig.Builder(handleUnknownAction).addResultConfigs(myMap).build();
//className("com.kenmcwilliams.tiles.result.TilesResult")
return actionConfig;
}
@Override
public Result handleUnknownResult(ActionContext actionContext, String actionName,
ActionConfig actionConfig, String resultCode) throws XWorkException {
log.info("TilesUnknownHandler: before handleUnknownResult");
Result handleUnknownResult = super.handleUnknownResult(actionContext, actionName, actionConfig, resultCode);
log.info("TilesUnknownHandler: after handleUnknownResult, returning with:");
log.log(Level.INFO, "...Result value: {0}", (new JSONSerializer().serialize(handleUnknownResult)));
return handleUnknownResult;
}
}
如何使用我们的“位置”字符串的示例，其形式为：NameSpace + "#" + ActionName + ".jsp"，请注意以下定义<definition name="REGEXP:(.*)#(.*)" extends="default">：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 3.0//EN" "http://tiles.apache.org/dtds/tiles-config_3_0.dtd">
<tiles-definitions>
<definition name="default" template="/WEB-INF/template/template.jsp">
<put-list-attribute name="cssList" cascade="true">
<add-attribute value="/style/cssreset-min.css" />
<add-attribute value="/style/cssfonts-min.css" />
<add-attribute value="/style/cssbase-min.css" />
<add-attribute value="/style/grids-min.css" />
<add-attribute value="/script/jquery-ui-1.8.24.custom/css/ui-lightness/jquery-ui-1.8.24.custom.css" />
<add-attribute value="/style/style.css" />
</put-list-attribute>
<put-list-attribute name="jsList" cascade="true">
<add-attribute value="/script/jquery/1.8.1/jquery.min.js" />
<add-attribute value="/script/jquery-ui-1.8.24.custom/js/jquery-ui-1.8.24.custom.min.js" />
<add-attribute value="/script/jquery.sort.js" />
<add-attribute value="/script/custom/jquery-serialize.js" />
</put-list-attribute>
<put-attribute name="title" value="defaults-name" cascade="true" type="string"/>
<put-attribute name="head" value="/WEB-INF/template/head.jsp"/>
<put-attribute name="header" value="/WEB-INF/template/header.jsp"/>
<put-attribute name="body" value="/WEB-INF/template/body.jsp"/>
<put-attribute name="footer" value="/WEB-INF/template/footer.jsp"/>
</definition>
<definition name="REGEXP:(.*)#(.*)" extends="default">
<put-attribute name="title" cascade="true" expression="OGNL:@com.opensymphony.xwork2.ActionContext@getContext().name"/>
<put-attribute name="body" value="/WEB-INF/content{1}/{2}"/>
</definition>
</tiles-definitions>
有了这个，您可以在 /WEB-INF/content/someplace/my-action.jsp 下创建 JSP
就像您使用约定和瓷砖一样，如果您创建一个com.myapp.action.someplace.MyAction没有任何结果类型调用的动作类，该代码将执行并且/WEB-INF/content/someplace/my-action.jsp仍将呈现结果。
那里有约定+没有更多注释的图块（对于正常情况来说很好）。
注意事项：
REGEXP:(.*)#(.*)定义之间放置定义来覆盖正常情况。例如，可以在这两个定义之间放置一个名为的定义。毕竟，如果您不能这样做并且所有页面都必须平铺相同，我们真的不会使用平铺！defaultREGEXP:(.*)#(.*)authenticated\(.*)