使用freemarker静态化
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1.maven引入jar包
<!--freemarker --><dependency><groupId>org.freemarker</groupId><artifactId>freemarker</artifactId><version>2.3.23</version></dependency>
2.项目中WEB-INF目录下,导入struts-tags.tld(可从struts2的core.jar包解压后获取),建立文件夹放入模板文件(*.tld),如图
模板例子(来自网上的教材例子)
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><center><h2>1.字符串处理</h2><#assign msg=' this IS the Test of freemarker & output'> 后台放入字符串:${msg} ===== ${msg} <br> html编码:${msg?html}<br> 转第一个字母大写:${msg?cap_first}<br> <#-- 转第一个字母小写:${msg?lower_first}<br>--> 字符串大写:${msg?upper_case}<br> 字符串小写:${msg?lower_case}<br> 去左右空格:${msg?trim}<br> 空值判断:${msg?if_exists}<br> 默认值abc:${msg?default('abc')}<br> 输出纯文本:${r"c:/ad/dfa"}<br> 插入boolean值false:<#assign foo=false/>${foo?string('true','false')}<br> 取下标为2的字符:${msg[2]}<br> 取字串1-7:${msg[1..7]}<br> 字符串拼接: <#assign ab="abc"> ${"hello "+ab}/${"hello${ab}"} <br><hr><h2>2.数字处理</h2>赋值 assign x=3.1415926<br> <#assign x=3.1415926 /> x:m3小数部分最小3位 #{x;m3}<br> x:M5小数部分最大5位 #{x;M5}<br> x:m1M5 #{x;m1M5}<br> 运算结果:3*5=${3*5}<br> 内建int 1.1?int=:${1.1?int}<br> <br> 赋值assign y=20<br> <#assign y=20> 输出数字原:${y?string.number}<br> 输出货币数字:${y?string.currency}<br> 输出百分比:${y?string.percent}<br> 比较大小 21(使用括号): y>21= <#if (y >21) > false <#else> true </#if> <br> 比较大小 21(使用字串):y>21= <#if y gt 21> false <#else> true </#if> <br> 转义字符：${r"< lt <= lte > gt >= gte"} <br><hr><h2>3.其他处理</h2>日期: <br> 格式化输出:${date?string('yyyy-MM-dd')}<br> 格式输出yyyy-MM-dd HH:mm:ss zzzz:${date?string("yyyy-MM-dd HH:mm:ss zzzz")}<br><hr><h2>4.流程控制</h2>赋值:assign a = '1'<br> A.if - else逻辑判断<br> <#assign a = '1'> <#if a='0'> 0 <#elseif a='1'> 1 <#else> 2 </#if> <br> B.Switch<br> <#switch a> <#case '0'> 0 <#break> <#case '1'> 1 <#break> <#default> 2 </#switch> <br> C.遍历list<br> 后台传递list:stuList<br> 判断是否为空: <#if stuList?size=0> 空的 <#else> 非空 </#if> <br> 下标: <#list stuList as stu> ${stu_index} </#list><br> 内容: <#list stuList as stu> ${stu.name} </#list><br><hr><h2>5.集合</h2>定义list["winter","spring","summer","autumn"]<br> 输出:<#list ["winter","spring","summer","autumn"] as x> ${x} </#list> <br> list[1..5] <#list 1..5 as list> ${list} </#list> <br> 定义Map{"abc":23,"efg":35}<br> <#assign ages={"abc":23,"efg":35}> 输出abc的年龄:${ages.abc}<br> 输出efg的年龄:${ages.efg}<br> 定义map，分别输出K-V <#assign selectelement = {"1":"选择A","2":"选择B","3":"选择C", "4":"选择D"}> <#assign skeys=selectelement?keys> <#list skeys as key> <#assign var0="${selectelement[key]}"> ${key}-${selectelement[key]} ---- ${var0} </#list><br> 序列连接["a","b"]+["e","f"]: <#assign liab=["a","b"]+["e","f"]> <#list liab as l > ${l} </#list><br> 散列连接{"1":"a","2":"b"}+{"2":"c","3":"d"}【散列右值覆盖左值】： <#assignma={"1":"a","2":"b"}+{"2":"c","3":"d"} > <#assign keys=ma?keys > <#list keys as k> ${ma[k]} </#list><br> 双重list循环<br> <#list num as list> <#list list as temp> ${temp} </#list> <br> </#list> <br><hr><h2>6.宏的使用</h2>A.使用宏 <#macro greet person color> <font size="+2" color="${color}">Hello ${person}!</font> </#macro> <@greet person="ken" color="blue"/> <br> B.宏调用和嵌套nested:<br> <#macro border msg> ${msg}<br> <#nested><br> repart:<br> <#nested><br> </#macro> <@border msg="The OUT MSG:"> Macro Test! </@border> <br> C.宏与宏之间的嵌套:<br> <#macro person name> Hello! ${name}<br> </#macro> <@border msg="The OUT MSG:"> <@person name="Ken"/> </@border><br> D.宏变量中使用循环变量<br> <#macro repeat count> <#list 1..count as x> <#nested x,x/2,x==count /> </#list> </#macro> <@repeat count=4;c,halfc,last> ${c}. ${halfc}<br> <#if last> last! </#if> </@repeat></center></body></html>3.web.xml文件加入如下代码启动运行
<servlet><servlet-name>JspSupportServlet</servlet-name><servlet-class>org.apache.struts2.views.JspSupportServlet</servlet-class><load-on-startup>1</load-on-startup></servlet>
4.struts.xml配置:
<package name="" extends="struts-default" namespace="/"> <action name="loadStudent" class="com.smartsoft.action.StudentAction" method="loadStudent"> <result name="success" type="freemarker">/WEB-INF/flt/student.ftl</result> </action> </package>
5.Controller控制类代码:
package com.smartsoft.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.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Locale;import java.util.Map;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;import com.smartsoft.model.Student;import freemarker.template.Configuration;import freemarker.template.Template;import freemarker.template.TemplateException;public class TempHtmlAction extends ActionSupport {// private static final Logger logger = LogManager.getLogger(GeneHtmlFileAction.class);private Configuration freemarker_cfg = null;public String toHtml() {// TempHtmlService tempHtmlService = ServiceLocator.getTempHtmlrService();String sGeneFilePath = "";String sFileName = "student.html";try {Map<String, Object> dataMap = getData();geneHtmlFile("student.ftl", dataMap, sGeneFilePath, sFileName);} catch (Exception e) {// logger.error("Index Html Error:" + e.getMessage(), e);}return null;}/** * 获取freemarker的配置. freemarker本身支持classpath,目录和从ServletContext获取. */protected Configuration getFreeMarkerCFG() {if (null == freemarker_cfg) {File templateFile = new File(ServletActionContext.getServletContext().getRealPath("/") + "WEB-INF/flt");freemarker_cfg = new Configuration();try {freemarker_cfg.setDirectoryForTemplateLoading(templateFile);freemarker_cfg.setDefaultEncoding("UTF-8");freemarker_cfg.setEncoding(Locale.CHINA, "UTF-8");} catch (IOException e) {// logger.error("Get tempalte error", e);}}return freemarker_cfg;}public Map<String, Object> getData() {System.out.println("参数处理...");Student student = new Student();student.setId(new Integer(110));student.setName("Tom");student.setBirthDate(new Date());Student student2 = new Student();student2.setId(new Integer(111));student2.setName("ken");student2.setBirthDate(new Date());List stuList = new ArrayList();stuList.add(student);stuList.add(student2);List indexList = new ArrayList();indexList.add(new Integer(110));indexList.add(new Integer(112));List number = new ArrayList();number.add(new Integer(1));number.add(new Integer(2));number.add(new Integer(3));List number2 = new ArrayList();number2.add(new Integer(4));number2.add(new Integer(5));number2.add(new Integer(6));List num = new ArrayList();num.add(number);num.add(number2);Date date = new Date();Map<String, Object> dataMap = new HashMap<String, Object>();dataMap.put("stuList", stuList);dataMap.put("msg", " get list success & success! ");dataMap.put("isExist", Boolean.TRUE);dataMap.put("date", date);dataMap.put("num", num);dataMap.put("indexList", indexList);System.out.println("结束处理...");return dataMap;}/** * 生成静态文件. * * @param templateFileName * 模板文件名,相对htmlskin路径,例如"/tpxw/view.ftl" * @param propMap * 用于处理模板的属性Object映射 * @param htmlFilePath * 要生成的静态文件的路径,相对设置中的根路径,例如 "/tpxw/1/2005/4/" * @param htmlFileName * 要生成的文件名,例如 "1.htm" */public boolean geneHtmlFile(String templateFileName, Map<String, Object> propMap, String htmlFilePath, String htmlFileName) {// @todo 从配置中取得要静态文件存放的根路径:需要改为自己的属性类调用// String sRootDir = "/var/www/ddtank/web";// String sRootDir = ServletActionContext.getRequest().getRealPath("/webpage");try {if (propMap == null) {propMap = new HashMap<String, Object>();}String sRootDir = "e:/webtest/htmlfile";Template t = getFreeMarkerCFG().getTemplate(templateFileName, "UTF-8");t.setEncoding("UTF-8");// 如果根路径存在,则递归创建子目录creatDirs(sRootDir, htmlFilePath);File afile = new File(sRootDir + "/" + htmlFilePath + "/" + htmlFileName);Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile), "UTF-8"));t.process(propMap, out);// ServletContext servletContext = ServletActionContext.getServletContext();// // data.put("JspTaglibs", new TaglibFactory(servletContext));// FreemarkerManager freemarkerManager = new FreemarkerManager();// Configuration configuration = freemarkerManager.getConfiguration(servletContext);// HttpServletRequest request = ServletActionContext.getRequest();// HttpServletResponse response = ServletActionContext.getResponse();// ServletContextHashModel servletContextModel = (ServletContextHashModel) servletContext.getAttribute(".freemarker.Application");// if (servletContextModel == null) {// GenericServlet servlet = JspSupportServlet.jspSupportServlet;// if (servlet != null) {// servletContextModel = new ServletContextHashModel(servlet, configuration.getObjectWrapper());// servletContext.setAttribute(".freemarker.Application", servletContextModel);// TaglibFactory taglibs = new TaglibFactory(servletContext);// servletContext.setAttribute(".freemarker.JspTaglibs", taglibs);// }// }// HttpRequestHashModel requestModel = (HttpRequestHashModel) request.getAttribute(".freemarker.Request");// if ((requestModel == null) || (requestModel.getRequest() != request)) {// requestModel = new HttpRequestHashModel(request, response, configuration.getObjectWrapper());// request.setAttribute(".freemarker.Request", requestModel);// }// propMap.put("Application", servletContextModel);// propMap.put("Request", requestModel);// propMap.put("Session", ServletActionContext.getRequest().getSession());// propMap.put("JspTaglibs", new TaglibFactory(ServletActionContext.getServletContext()));//// Template t = getFreeMarkerCFG().getTemplate(templateFileName);//// // 如果根路径存在,则递归创建子目录// creatDirs(sRootDir, htmlFilePath);// File afile = new File(sRootDir + "/" + htmlFilePath + "/" + htmlFileName);// Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(afile), "UTF-8"));//// t.process(propMap, out);// out.flush();// out.close();} catch (TemplateException e) {// logger.error("Error while processing FreeMarker template "// + templateFileName, e);e.printStackTrace();return false;} catch (IOException e) {// logger.error("Error while generate Static Html File "// + htmlFileName, e);e.printStackTrace();return false;}return true;}/** * 创建多级目录 * * @param aParentDir * String * @param aSubDir * 以 / 开头 * @return boolean 是否成功 */public static boolean creatDirs(String aParentDir, String aSubDir) {File aFile = new File(aParentDir);if (!aFile.exists()) {aFile.mkdirs();}File aSubFile = new File(aParentDir + aSubDir);if (!aSubFile.exists()) {return aSubFile.mkdirs();} else {return true;}}}6.测试实体类:
package com.smartsoft.model;import java.io.Serializable;import java.util.Date;public class Student implements Serializable {private Integer id;private String name;private Date birthDate;private String dsc;private Date birth;private Integer sex;//省略get,set}以上是最基本的静态化代码流程,配合相关技术便可做出最好的静态化代码了,这里我就不说了
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