以freemarker为展现方式或以freemarker ftl模板为框架生成静态化页面：
freemarker库：freemarker-2.3.19.jar
涉及4种应用方式
1，页面静态化之Servlet中使用freemarker
2，页面展现之Struts2结合freemarker使用
3，页面静态化之Struts2结合freemarker使用
4，页面展现之Servlet中使用freemarker(略，改一下输出流即可)
一，页面静态化之Servlet中使用freemarker
目标：
以freemarker的ftl模板文件为页面框架，
实现以html静态页面方式展现http servlet请求，html文件不存在时servlet生成html文件并重定向至该html页面，html文件存在时直接重定向至该html页面
1，java web项目文件目录设定
静态页面输出目录：WebRoot/html/
ftl模板目录：WebRoot/templates/
2，web.xml设定
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>Log4jInit</servlet-name> <servlet-class>com.log4j.Log4jInit</servlet-class> <init-param> <param-name>log4j-init</param-name> <param-value>WEB-INF/classes/log4j.properties</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet> <servlet-name>freemarkertest</servlet-name> <servlet-class>com.servlet.FreemarkerList</servlet-class> <load-on-startup>4</load-on-startup> </servlet> <servlet-mapping> <servlet-name>freemarkertest</servlet-name> <url-pattern>/testfree</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <error-page> <error-code>500</error-code> <location>/jsp/error.jsp</location> </error-page> <error-page> <error-code>404</error-code> <location>/jsp/error.jsp</location> </error-page> <error-page> <error-code>400</error-code> <location>/jsp/error.jsp</location> </error-page> </web-app> <strong><span style="font-size:12px;"> </span></strong>
3，ftl模板文件testfm.ftl ，内容：
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>freemarker测试</title>
</head>
<body>
<h1>${message},${name}</h1>
<ol>
<#list myList as lst>
<li><a href="javascript:void(0)"> ${lst}</a> </li>
</#list>
</ol>
</body>
</html>
4，Servlet内容
package com.servlet;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;
import java.nio.charset.Charset;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
/** *
* 页面静态化之Servlet中使用freemarker *
*/
public class FreemarkerList extends HttpServlet {
private static SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
// 负责管理FreeMarker模板的Configuration实例
private Configuration cfg = null;
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
// 创建一个FreeMarker实例
cfg = new Configuration();
// 指定FreeMarker模板文件的位置
cfg.setServletContextForTemplateLoading(this.getServletContext(),"templates");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// 建立数据模型
Map root = new HashMap();
root.put("message", "hello");
root.put("name", "java中文");
root.put("myList", Arrays.asList(new String[]{"A","B","C","D","E","F","G","H","I","J","K","L","M"}));
// 获取模板文件
Template t = cfg.getTemplate("testfm.ftl","utf-8"); //如果未指定编码，那么展现html时中文是乱码
resp.setContentType("text/html;charset=UTF-8" );
resp.setCharacterEncoding("utf-8");
try {
String contextpath = this.getServletContext().getRealPath("") + "/html/";//绝对路径
String fname = sdf.format(new Date()) + ".html";
File f = new File(contextpath + fname);//绝对路径
if(f.exists()){//已存在文件
resp.sendRedirect("html/" + fname);//相对项目根目录，重定向
}else{//还没生成文件时
Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(f),Charset.forName("utf-8")));
t.process(root, out); // 往模板里写数据 , 先生成文件
out.flush();
out.close();
resp.sendRedirect("html/"+ fname);//相对项目根目录，重定向，页面静态化
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
5，测试
浏览器输入url：http://localhost:8080/prjname/testfree
html/20160419.html文件存在或不存在时，浏览器地址栏都变为：http://localhost:8080/prjname/html/20160419.html，
内容：
hello,java中文
1.A
2. B
3. C
4. D
5. E
6. F
7. G
8. H
9. I
10. J
11. K
12. L
13. M
二，页面静态化之Struts2结合freemarker使用
目标：
以freemarker的ftl模板文件为页面框架，实现以html静态页面方式展现Action请求，html文件不存在时Action生成html文件并重定向至该html页面，html文件存在时直接重定向至该html页面
三，页面展现之Struts2结合freemarker使用
目标：
以freemarker的ftl模板文件为页面框架，freemarker为视图，实现动态显示页面内容
--------------------------------------------------------------
1，java web项目文件目录设定
静态页面输出目录：WebRoot/html/
ftl模板目录：WebRoot/templates/
2，web.xml设定
略
3，struts.xml设定
采用convention注解方式，xml略
4，Action类内容，
页面静态化之Struts2结合freemarker使用，Action方法为turndir()，结果类型redirect；
页面展现之Struts2结合freemarker使用，Action方法为resftl()，结果类型freemarker；
package com.actions;
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.nio.charset.Charset;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Results;
import com.opensymphony.xwork2.ActionSupport;
import freemarker.template.Configuration;
import freemarker.template.Template;
/** *
* Struts2结合Struts2结合freemarker使用，页面静态化 以及 以ftl模板为视图展现方式
*
*/
@Results(value = {
@Result(name="ftl",type="freemarker",location="/templates/testfm.ftl" ) ,//注意拼写
@Result(name="turndirection",type="redirect",location="${htmlurl}")
})
public class FreemarkertestAction extends ActionSupport {
public HttpServletRequest request = ServletActionContext.getRequest();
public HttpServletResponse response = ServletActionContext.getResponse();
/**
*
*/
private static final long serialVersionUID = -8894067364939169084L;
private static SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
public String htmlurl;
public String getHtmlurl() {
return htmlurl;
}
public void setHtmlurl(String htmlurl) {
this.htmlurl = htmlurl;
}
String message;
String name;
List myList;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List getMyList() {
return myList;
}
public void setMyList(List myList) {
this.myList = myList;
}
public String resftl(){
this.setMessage("hello");
this.setName("Java 中文 Ftl Action");
this.setMyList(Arrays.asList(new String[]{"a","b","c","d","e","f","g","h","I","J","K","L","M"}));
return "ftl";
}
public String turndir(){
// 负责管理FreeMarker模板的Configuration实例
Configuration cfg = null;
// 建立数据模型
Map root = new HashMap();
root.put("message", "hello");
root.put("name", "java中文");
root.put("myList", Arrays.asList(new String[]{"A","B","C","D","E","F","G","H","I","J","K","L","M"}));
try {
cfg = new Configuration();
// 指定FreeMarker模板文件的位置
String contextpath = ServletActionContext.getServletContext().getRealPath("/") + "/html/" ;
String fname = sdf.format(new Date()) + ".html";
cfg.setServletContextForTemplateLoading(ServletActionContext.getServletContext(),"templates");
cfg.setEncoding(Locale.getDefault(), "utf-8");
Template t = cfg.getTemplate("testfm.ftl","utf-8"); //如果未指定编码，那么展现html时中文是乱码
response.setContentType("text/html;charset=UTF-8" );
File f = new File(contextpath + fname);//绝对路径
if(f.exists()){//已存在文件
this.setHtmlurl("/html/" + fname);
return "turndirection";
}else{//还没生成文件时
Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(f),Charset.forName("utf-8")));
t.process(root, out); // 往模板里写数据 , 先生成文件
out.flush();
out.close();
this.setHtmlurl("/html/" + fname);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "turndirection";
}
}
5，测试
测试静态页面生成展现浏览器输入url：http://localhost:8080/prjname/freemarkertest!turndir.do
正常内容：
hello,java中文
1.A
2. B
3. C
4. D
5. E
6. F
7. G
8. H
9. I
10. J
11. K
12. L
13. M
测试freemarker展现浏览器输入url：http://localhost:8080/prjname/freemarkertest!resftl.do
正常内容：
hello,Java 中文 Ftl Action
1. a
2. b
3. c
4. d
5. e
6. f
7. g
8. h
9. I
10. J
11. K
12. L
13. M