freemarker实例

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freemarker实例、生成静态文件

一、模板文件（ftl文件）

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>查看文章: ${newsitem.title}</title>
<script src="../../common/js/jquery.js" type="text/javascript"></script>
<script type="text/javascript" src="../../common/js/base.js"></script>
<script>
function getValue(){
    	 $.ajax({   
            type : "post",   
            url : "../../TestServlet?action=getValue",  
            data : null,   
            success:function(msg){   
            	alert(msg);
            }
         })
    }
</script>
</head>
<body>
<input type="button" value="生成静态文件" onClick="getValue()" />
<table width="100%" border="0" cellpadding="0" cellspacing="0"  bgcolor="#FFFFFF">
<tr><td>
<table width="95%" border="0" align="center" cellpadding="2" cellspacing="6">
 <tr>
 <td height="10" align="left" colspan=2></td>
 </tr>         
 <tr>          
 <td align="left" width="538">
 <strong>${newsitem.title}</strong> ( ${newsitem.publishDate} )          
 </td>          
 <td align="right">           
 <a href="index.jsp">返回</a>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;          
</td>         
</tr>         
<tr>          
<td align="left" valign=top colspan=2>           
<hr align="left" width="95%" size="1" noshade color="#cc0000">          
</td>         
</tr>         
<tr>          
<td colspan=2>           
${newsitem.content}          
</td>         
</tr>        
</table>        
<br>       
</td>      </tr>     
</table> 
</body>
</html>

二、servlet业务逻辑代码

public void getValue(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		FreeMarkerTest freeMarkerTest = new FreeMarkerTest();
		String path = request.getRealPath("/");
		String fileName = getNewFileName();
		boolean b = freeMarkerTest.createStaticHtml(path,fileName);
		response.getWriter().print(b);
	}

/**
	 * 生成新文件名称（年月日时分秒+二位随机码）
	 * 
	 * @return
	 */
	public String getNewFileName() {
		String newFileName = "";
		Date date = new Date();
		SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
				"yyyyMMddHHmmss");
		newFileName = simpleDateFormat.format(date);
		String random = getRandom(2);
		return newFileName + random;
	}

	/**
	 * 获取n位随机数
	 * 
	 * @param n
	 * @return
	 */
	public String getRandom(int n) {
		String randomString = "";
		if (n == 1) {
			randomString = (int) (Math.random() * 10) + "";
		} else {
			randomString = getRandom(n - 1) + (int) (Math.random() * 10);
		}
		return randomString;
	}

三、dao 层核心代码

import java.io.*;
import java.util.HashMap;
import java.util.Map;

import freemarker.template.*;
/**
 * FreeMarker
 * @author Administrator
 * @data Mar 27, 2012
 */
public class FreeMarkerTest {
	private Configuration freemarker_cfg = null;

	public boolean createStaticHtml(String path,String fileName) {
		NewsItem aItem = new NewsItem();
		aItem.setTitle("新闻信息一");
		aItem.setAuthor("administrator");
		aItem.setHotNum("1000");
		aItem.setPublishDate("2012-03-20");
		aItem.setContent("新闻信息内容%%%%");

		FreeMarkerTest test = new FreeMarkerTest();

		Map root = new HashMap();
		root.put("newsitem", aItem);

		String sGeneFilePath = "/";
		boolean bOK = test.geneHtmlFile("view.ftl", root, sGeneFilePath,
				fileName+".htm",path);
		return bOK;
	}

	/**
	 * 获取freemarker的配置. freemarker本身支持classpath,目录和从ServletContext获取.
	 */
	protected Configuration getFreeMarkerCFG(String path) {
		if (null == freemarker_cfg) {
			freemarker_cfg = new Configuration();
			try {
				freemarker_cfg.setDirectoryForTemplateLoading(new File(path));
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return freemarker_cfg;
	}

	/**
	 * 生成静态文件.
	 * 
	 * @param templateFileName
	 * @param propMap
	 * @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 propMap,
			String htmlFilePath, String htmlFileName,String path) {
		// @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 = path + "/modules/news/";//保存文件路径
		Writer out = null;
		try {
			path = path + "WEB-INF/FTL/";//ftl路径
			Template t = getFreeMarkerCFG(path).getTemplate(templateFileName);
			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);

			out = new BufferedWriter(new OutputStreamWriter(
					new FileOutputStream(afile),"UTF-8"));

			t.process(propMap, out);
		} catch (TemplateException e) {
			e.printStackTrace();
			return false;
		} catch (IOException e) {
			e.printStackTrace();
			return false;
		} finally{
			try {
				out.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		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()) {
			File aSubFile = new File(aParentDir + aSubDir);
			if (!aSubFile.exists()) {
				return aSubFile.mkdirs();
			} else {
				return true;
			}
		} else {
			return false;
		}
	}
}

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