Struts2和Freemarker整合应用静态页面，struts2freemarker,利用Struts2生成静

Struts2和Freemarker整合应用静态页面，struts2freemarker,利用Struts2生成静

利用Struts2生成静态页面其实很灵活，很强大，尤其是利用Struts2对Freemarker较好的支持，充分利用Freemarker的模板功能来生成静态页面。基本思路为：利用Struts2对自定义result type的支持，自定义能够生成静态页面的result type，结合模板引擎Freemarker可以实现大批量静态页面的生成。参看org.apache.struts2.views.freemarker.FreemarkerResult的代码实现，自定义了自己的生成静态页 面的resulttype。此种方案不单纯用于生成静态页面，其实也可以用于生成诸如wml、xhtml等内容，具体可以参考Struts2缺省提供的各种resulttype的实现。

FreemarkerResult.java

package com.mobilesoft.esales.webapp.action; import java.io.BufferedWriter;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.Writer;import java.util.Locale; import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import org.apache.struts2.ServletActionContext;import org.apache.struts2.dispatcher.StrutsResultSupport;import org.apache.struts2.views.freemarker.FreemarkerManager;import org.apache.struts2.views.util.ResourceUtil; import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionInvocation;import com.opensymphony.xwork2.LocaleProvider;import com.opensymphony.xwork2.inject.Inject;import com.opensymphony.xwork2.util.ValueStack; import freemarker.template.Configuration;import freemarker.template.ObjectWrapper;import freemarker.template.Template;import freemarker.template.TemplateException;import freemarker.template.TemplateModel;import freemarker.template.TemplateModelException; public class FreemarkerResult extends StrutsResultSupport {     private static final long serialVersionUID = -3778230771704661631L;     protected ActionInvocation invocation;    protected Configuration configuration;    protected ObjectWrapper wrapper;    protected FreemarkerManager freemarkerManager;    private Writer writer;    protected String location;    private String pContentType = “text/html”;     protected String fileName; // 要生成的静态页面名称    protected String filePath; // 要生成的静态页面的路径    protected String staticTemplate; // 用于生成静态页面Freemarker模板的路径     public FreemarkerResult() {        super();    }     public FreemarkerResult(String location) {        super(location);    }     @Inject    public void setFreemarkerManager(FreemarkerManager mgr) {        this.freemarkerManager = mgr;    }     public void setContentType(String aContentType) {        pContentType = aContentType;    }     public String getContentType() {        return pContentType;    }     public void doExecute(String location, ActionInvocation invocation)            throws IOException, TemplateException {        this.location = location;        this.invocation = invocation;        this.configuration = getConfiguration();        this.wrapper = getObjectWrapper();         this.fileName = (String) conditionalParse(fileName, invocation);        this.staticTemplate = (String) conditionalParse(staticTemplate, invocation);        this.filePath = ((String) conditionalParse(filePath, invocation)) == null ? “”                : ((String) conditionalParse(filePath, invocation));         if (!location.startsWith(”/”)) {            ActionContext ctx = invocation.getInvocationContext();            HttpServletRequest req = (HttpServletRequest) ctx                    .get(ServletActionContext.HTTP_REQUEST);            String base = ResourceUtil.getResourceBase(req);            location = base + “/” + location;        }         //生成html页面的模板类        Template template = configuration.getTemplate(location, deduceLocale());        // 生成静态页面的的模板类        Template staticTemplate = configuration.getTemplate(this.staticTemplate,                deduceLocale());         TemplateModel model = createModel();        String path = ServletActionContext.getServletContext().getRealPath(                filePath)                + File.separator;        Writer out = new BufferedWriter(new OutputStreamWriter(                new FileOutputStream(path + fileName)));         if (preTemplateProcess(template, model)) {            try {                staticTemplate.process(model, out);                template.process(model, getWriter());            } finally {                postTemplateProcess(template, model);                postTemplateProcess(staticTemplate, model);            }        }    }     protected Configuration getConfiguration() throws TemplateException {        return freemarkerManager.getConfiguration(ServletActionContext                .getServletContext());    }     protected ObjectWrapper getObjectWrapper() {        return configuration.getObjectWrapper();    }     public void setWriter(Writer writer) {        this.writer = writer;    }     protected Writer getWriter() throws IOException {        if (writer != null) {            return writer;        }        return ServletActionContext.getResponse().getWriter();    }     protected TemplateModel createModel() throws TemplateModelException {        ServletContext servletContext = ServletActionContext                .getServletContext();        HttpServletRequest request = ServletActionContext.getRequest();        HttpServletResponse response = ServletActionContext.getResponse();        ValueStack stack = ServletActionContext.getContext().getValueStack();         Object action = null;        if (invocation != null)            action = invocation.getAction(); // Added for NullPointException        return freemarkerManager.buildTemplateModel(stack, action,                servletContext, request, response, wrapper);    }     protected Locale deduceLocale() {        if (invocation.getAction() instanceof LocaleProvider) {            return ((LocaleProvider) invocation.getAction()).getLocale();        } else {            return configuration.getLocale();        }    }     protected void postTemplateProcess(Template template, TemplateModel data)            throws IOException {    }     protected boolean preTemplateProcess(Template template, TemplateModel model)            throws IOException {        Object attrContentType = template.getCustomAttribute(”content_type”);         if (attrContentType != null) {            ServletActionContext.getResponse().setContentType(                    attrContentType.toString());        } else {            String contentType = getContentType();             if (contentType == null) {                contentType = “text/html”;            }             String encoding = template.getEncoding();             if (encoding != null) {                contentType = contentType + “; charset=” + encoding;            }             ServletActionContext.getResponse().setContentType(contentType);        }         return true;    }     public String getFileName() {        return fileName;    }     public void setFileName(String fileName) {        this.fileName = fileName;    }     public String getFilePath() {        return filePath;    }     public void setFilePath(String filePath) {        this.filePath = filePath;    }     public String getStaticTemplate() {        return staticTemplate;    }     public void setStaticTemplate(String staticTemplate) {        this.staticTemplate = staticTemplate;    }}

struts.xml

<action name=”staticViewAction”  class=”com.mobilesoft.esales.webapp.action.StaticViewtAction”>    <result name=”success” type=”staticview”>    <param name=”location”>test/freemarkertest.ftl</param>    <param name=”contentType”>text/html</param>     <param name=”fileName”>${filename}</param>    <param name=”staticTemplate”>test/freemarkertest.ftl</param>    <param name=”filePath”>static</param>    </result>                    </action>