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踩 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result type。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result type的实现。
标签： FreeMarker web.xml Struts 代码片段(2)
[代码] FreemarkerResult.java
view sourceprint?
001 package com.mobilesoft.esales.webapp.action;
002 import java.io.BufferedWriter;
003 import java.io.File;
004 import java.io.FileOutputStream;
005 import java.io.IOException;
006 import java.io.OutputStreamWriter;
007 import java.io.Writer;
008 import java.util.Locale;
009 import javax.servlet.ServletContext;
010 import javax.servlet.http.HttpServletRequest;
011 import javax.servlet.http.HttpServletResponse;
012 import org.apache.struts2.ServletActionContext;
013 import org.apache.struts2.dispatcher.StrutsResultSupport;
014 import org.apache.struts2.views.freemarker.FreemarkerManager;
015 import org.apache.struts2.views.util.ResourceUtil;
016 import com.opensymphony.xwork2.ActionContext;
017 import com.opensymphony.xwork2.ActionInvocation;
018 import com.opensymphony.xwork2.LocaleProvider;
019 import com.opensymphony.xwork2.inject.Inject;
020 import com.opensymphony.xwork2.util.ValueStack;
021 import freemarker.template.Configuration;
022 import freemarker.template.ObjectWrapper;
023 import freemarker.template.Template;
024 import freemarker.template.TemplateException;
025 import freemarker.template.TemplateModel;
026 import freemarker.template.TemplateModelException;
027
028 public class FreemarkerResult extends StrutsResultSupport {
029 private static final long serialVersionUID = -3778230771704661631L;
030 protected ActionInvocation invocation;
031 protected Configuration configuration;
032 protected ObjectWrapper wrapper;
033 protected FreemarkerManager freemarkerManager;
034 private Writer writer;
035 protected String location;
036 private String pContentType = “text/html”;
037 protected String fileName; // 要生成的静态页面名称
038 protected String filePath; // 要生成的静态页面的路径
039 protected String staticTemplate; // 用于生成静态页面Freemarker模板的路径
040 public FreemarkerResult() {
041 super();
042 }
043 public FreemarkerResult(String location) {
044 super(location);
045 }
046 @Inject
047 public void setFreemarkerManager(FreemarkerManager mgr) {
048 this.freemarkerManager = mgr;
049 }
050 public void setContentType(String aContentType) {
051 pContentType = aContentType;
052 }
053 public String getContentType() {
054 return pContentType;
055 }
056 public void doExecute(String location, ActionInvocation invocation)
057 throws IOException, TemplateException {
058 this.location = location;
059 this.invocation = invocation;
060 this.configuration = getConfiguration();
061 this.wrapper = getObjectWrapper();
062 this.fileName = (String) conditionalParse(fileName, invocation);
063 this.staticTemplate = (String) conditionalParse(staticTemplate, invocation);
064 this.filePath = ((String) conditionalParse(filePath, invocation)) == null ? “”
065 : ((String) conditionalParse(filePath, invocation));
066 if (!location.startsWith(”/”)) {
067 ActionContext ctx = invocation.getInvocationContext();
068 HttpServletRequest req = (HttpServletRequest) ctx
069 .get(ServletActionContext.HTTP_REQUEST);
070 String base = ResourceUtil.getResourceBase(req);
071 location = base + “/” + location;
072 }
073 //生成html页面的模板类
074 Template template = configuration.getTemplate(location, deduceLocale());
075 // 生成静态页面的的模板类
076 Template staticTemplate = configuration.getTemplate(this.staticTemplate,
077 deduceLocale());
078 TemplateModel model = createModel();
079 String path = ServletActionContext.getServletContext().getRealPath(
080 filePath)
081 + File.separator;
082 Writer out = new BufferedWriter(new OutputStreamWriter(
083 new FileOutputStream(path + fileName)));
084 if (preTemplateProcess(template, model)) {
085 try {
086 staticTemplate.process(model, out);
087 template.process(model, getWriter());
088 } finally {
089 postTemplateProcess(template, model);
090 postTemplateProcess(staticTemplate, model);
091 }
092 }
093 }
094 protected Configuration getConfiguration() throws TemplateException {
095 return freemarkerManager.getConfiguration(ServletActionContext
096 .getServletContext());
097 }
098 protected ObjectWrapper getObjectWrapper() {
099 return configuration.getObjectWrapper();
100 }
101 public void setWriter(Writer writer) {
102 this.writer = writer;
103 }
104 protected Writer getWriter() throws IOException {
105 if (writer != null) {
106 return writer;
107 }
108 return ServletActionContext.getResponse().getWriter();
109 }
110 protected TemplateModel createModel() throws TemplateModelException {
111 ServletContext servletContext = ServletActionContext
112 .getServletContext();
113 HttpServletRequest request = ServletActionContext.getRequest();
114 HttpServletResponse response = ServletActionContext.getResponse();
115 ValueStack stack = ServletActionContext.getContext().getValueStack();
116 Object action = null;
117 if (invocation != null)
118 action = invocation.getAction(); // Added for NullPointException
119 return freemarkerManager.buildTemplateModel(stack, action,
120 servletContext, request, response, wrapper);
121 }
122 protected Locale deduceLocale() {
123 if (invocation.getAction() instanceof LocaleProvider) {
124 return ((LocaleProvider) invocation.getAction()).getLocale();
125 } else {
126 return configuration.getLocale();
127 }
128 }
129 protected void postTemplateProcess(Template template, TemplateModel data)
130 throws IOException {
131 }
132 protected boolean preTemplateProcess(Template template, TemplateModel model)
133 throws IOException {
134 Object attrContentType = template.getCustomAttribute(”content_type”);
135 if (attrContentType != null) {
136 ServletActionContext.getResponse().setContentType(
137 attrContentType.toString());
138 } else {
139 String contentType = getContentType();
140 if (contentType == null) {
141 contentType = “text/html”;
142 }
143 String encoding = template.getEncoding();
144 if (encoding != null) {
145 contentType = contentType + “; charset=” + encoding;
146 }
147 ServletActionContext.getResponse().setContentType(contentType);
148 }
149 return true;
150 }
151 public String getFileName() {
152 return fileName;
153 }
154 public void setFileName(String fileName) {
155 this.fileName = fileName;
156 }
157 public String getFilePath() {
158 return filePath;
159 }
160 public void setFilePath(String filePath) {
161 this.filePath = filePath;
162 }
163 public String getStaticTemplate() {
164 return staticTemplate;
165 }
166 public void setStaticTemplate(String staticTemplate) {
167 this.staticTemplate = staticTemplate;
168 }
169 }
[代码] struts.xml
view sourceprint?1 <action name=”staticViewAction” class=”com.mobilesoft.esales.webapp.action.StaticViewtAction”>
2 <result name=”success” type=”staticview”>
3 <param name=”location”>test/freemarkertest.ftl</param>
4 <param name=”contentType”>text/html</param>
5 <param name=”fileName”>${filename}</param>
6 <param name=”staticTemplate”>test/freemarkertest.ftl</param>
7 <param name=”filePath”>static</param>
8 </result>
9 </action>