[计算机]freemarker根据模版生成文件使用例子

1、.目录说明1工具类11.接口Render12.基本类bean RenderClass13.基本类bean RenderProperty24.FreemarkerRender35.模版hibernate3.ftl46.工具类Assistant5如何使用16说明Java中使用freemarker根据模版来生成具有一定格式的文件。本例以java动态生成 hibernate的*.hbm.xml文件为例子，并且假设已经导入了freemarker .jar文件工具类1. 接口Renderpublic interface Render void render(RenderClass target,Strin

2、g template,String outpath);2. 基本类bean RenderClassimport java.util.List;public class RenderClass private String className;private String tableName;private String classPath;private List properties;public RenderClass()properties = null;public String getClassName() return className;public void setClassN

3、ame(String className) this.className = className;public String getTableName() return tableName;public void setTableName(String tableName) this.tableName = tableName;public List getProperties() return properties;public void setProperties(List properties) perties = properties;public void setCl

4、assPath(String classPath) this.classPath = classPath;public String getClassPath() return classPath;3. 基本类bean RenderPropertypackage j.table.function;/*/public class RenderProperty extends BuildPropertyprivate boolean primary;private String name;private String type;private String sequenc

5、e;private Integer length;private String field;/* 省略set跟get方法*/4. FreemarkerRenderpackage *;import java.io.FileOutputStream;import java.io.PrintWriter;import java.io.StringWriter;import freemarker.cache.ClassTemplateLoader;import freemarker.template.Configuration;import freemarker.template.ObjectWrap

6、per;import freemarker.template.SimpleHash;import freemarker.template.Template;import freemarker.template.TemplateExceptionHandler;public class FreemarkerRender implements Renderprivate Configuration templateconfig;public FreemarkerRender()this.initialize();public void initialize()tryif (templateconf

7、ig=null)templateconfig = new Configuration();templateconfig.setTemplateExceptionHandler(TemplateExceptionHandler.HTML_DEBUG_HANDLER);templateconfig.setObjectWrapper(ObjectWrapper.DEFAULT_WRAPPER);templateconfig.setTemplateLoader(new ClassTemplateLoader(this.getClass(),"/");templateconfig.s

8、etTemplateUpdateDelay(1200);templateconfig.setDefaultEncoding("gb2312");templateconfig.setLocale(new java.util.Locale("zh_CN");templateconfig.setNumberFormat("0.#");catch (Exception e)public void render(RenderClass target,String template,String outpath)tryStringWriter w

9、riter = new StringWriter();Template tl = templateconfig.getTemplate(template,templateconfig.getLocale();SimpleHash root = new SimpleHash();root.put("entity", target);cess(root, writer);Assistant.createNewFile(outpath);FileOutputStream fos = new FileOutputStream(outpath);PrintWriter p

10、writer = new PrintWriter(fos);pwriter.write(writer.toString();pwriter.close();fos.close(); catch (Exception ex)ex.printStackTrace();5. 模版hibernate3.ftl<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-/Hibernate/Hibernate Mapping DTD 3.0/EN&

11、quot;"<hibernate-mapping> <class name="$entity.className" table="$entity.tableName" dynamic-update="false" dynamic-insert="false" select-before-update="false" optimistic-lock="version"> <#if perties?exists>&

12、lt;#list perties as property><#if property.primary><id name="$" type="$property.type"><#else><property name="$" type="$property.type"></#if><#if property.type="java.lang.String"&

13、gt;<column name="$property.field?upper_case" <#if property.length?exists>length="$property.length"</#if>></column><#elseif property.type="java.util.Date"><column name="$property.field?upper_case" length=7></column><

14、#elseif property.type="java.lang.Long" | property.type="java.lang.Integer"| property.type="java.lang.Short"><column name="$property.field?upper_case" <#if property.length?exists>precision="$property.length"</#if> scale="0"

15、></column></#if><#if property.primary=true><generator class="native"/></id><#else></property></#if></#list></#if> </class></hibernate-mapping>6. 工具类Assistant这个类为通用工具类，可单独拷贝到其他项目使用。该类的结构及功能有：package j.ta

16、ble.function;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.text.SimpleDateFormat;import java.util.Calendar;import javax.serv

17、let.ServletContext;import javax.servlet.http.HttpServletRequest;import org.apache.log4j.Logger;public class Assistant private static final Logger log = Logger.getLogger(Assistant.class);public static String convertRequestParameter(String parameter) throws Exceptionreturn convertRequestParameter(para

18、meter,null);public static String convertRequestParameter(String parameter,String format) throws Exceptionif (parameter!=null)if (format=null)format="utf-8"parameter = .URLDecoder.decode(parameter,format);return parameter;/0public static boolean notEmpty(HttpServletRequest request,String ke

19、y)if (request.getParameter(key)!=null && request.getParameter(key).length()>0)return true;elsereturn false;public static void writeFileContent(String url,String content ,ServletContext context) throws ExceptionwriteFileContent( getFullPath(url,context),content);public static String HTMLEn

20、code(String txt) if (txt!=null && txt.length()>0)txt=txt.replaceAll("&","&amp;");txt=txt.replaceAll("<","&lt;");txt=txt.replaceAll(">","&gt;");txt=txt.replaceAll(""","&quot;");tx

21、t=txt.replaceAll("'","&#146;");return txt;public static boolean existFile(String urlpath,ServletContext context)File file = new File(getFullPath(urlpath, context);if (file.exists()return true;elsereturn false;public static void writeFileContent(String path,String content)

22、 throws ExceptionFile file = new File(path);if (!file.exists()file.createNewFile();OutputStreamWriter write= new OutputStreamWriter(new FileOutputStream(file),"GBK");BufferedWriter writer=new BufferedWriter(write);writer.write(content);writer.close();write.close();public static String getF

23、ileContent(String url,ServletContext context) throws ExceptionString filepath = getFullPath(url,context);return getFileContent(filepath);public static String getFileContent(String path) throws ExceptionStringBuffer buf = new StringBuffer();File file = new File(path);if (file.exists()InputStreamReade

24、r read = new InputStreamReader(new FileInputStream(file),"GBK");BufferedReader reader=new BufferedReader(read);tryString content = reader.readLine();while (content!=null)buf.append(content);content = reader.readLine();finallyif (reader!=null)reader.close();if (read!=null)read.close();retur

25、n buf.toString();/()public static java.util.Date addTimeByDay(java.util.Date date,int days) throws ExceptionCalendar calendar=Calendar.getInstance(); calendar.setTime(date);calendar.set(Calendar.DATE,calendar.get(Calendar.DATE)+days);return calendar.getTime();public static java.util.Date addTimeByMi

26、nutes(java.util.Date date,int minutes) throws ExceptionCalendar calendar=Calendar.getInstance(); calendar.setTime(date); calendar.set(Calendar.MINUTE,calendar.get(Calendar.MINUTE)+minutes);return calendar.getTime();public static java.util.Date addTimeBySeconds(java.util.Date date,int seconds) throws

27、 ExceptionCalendar calendar=Calendar.getInstance(); calendar.setTime(date); calendar.set(Calendar.SECOND,calendar.get(Calendar.SECOND)+seconds);return calendar.getTime();/õpublic static java.util.Date nowTime() throws ExceptionSimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

28、String datestr = sdf.format(java.util.Calendar.getInstance().getTime();return sdf.parse(datestr);/õpublic static java.util.Date nowFullTime() throws ExceptionSimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String datestr = sdf.format(java.util.Calendar.getInstance()

29、.getTime();return sdf.parse(datestr);public static java.util.Date nowFullTime(String format) throws ExceptionSimpleDateFormat sdf = new SimpleDateFormat(format);String datestr = sdf.format(java.util.Calendar.getInstance().getTime();return sdf.parse(datestr);public static String convertDateStrToStrin

30、g(String datestr,String format) throws ExceptionString result = null;SimpleDateFormat sdf = new SimpleDateFormat(format);tryresult = sdf.format(sdf.parse(datestr);catch (Exception ex) sdf = new SimpleDateFormat("yyyy-MM-dd");result = sdf.format(sdf.parse(datestr);return result;public stati

31、c String convertDateToString(java.util.Date date,String format) throws ExceptionSimpleDateFormat sdf = new SimpleDateFormat(format);return sdf.format(date);public static java.util.Date formatDateStr(String datestr) throws ExceptionSimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");r

32、eturn sdf.parse(datestr);public static java.util.Date formatDateStr(String datestr,String format) throws Exceptionjava.util.Date result = null;SimpleDateFormat sdf = new SimpleDateFormat(format);tryresult = sdf.parse(datestr);catch (Exception ex) sdf = new SimpleDateFormat("yyyy-MM-dd");re

33、sult = sdf.parse(datestr);return result;public static java.util.Date formatFullDateStr(String datestr) throws Exceptionjava.util.Date result = null;SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");tryresult = sdf.parse(datestr);catch (Exception ex) sdf = new SimpleDateFor

34、mat("yyyy-MM-dd");result = sdf.parse(datestr);return result;/·public static String getFileName(String filepath)filepath = filepath.replace('/', '');String filename = filepath;if (filepath.lastIndexOf('')>0)filename = filepath.substring(filepath.lastIndexOf(&

35、#39;')+1);return filename;public static void copy(ServletContext context,String form,String to ,boolean removeold) throws java.io.IOExceptioncopy(getFullPath(form,context),getFullPath(to,context),removeold);/removeold public static void copy( String from, String to,boolean removeold )throws java

36、.io.IOExceptionint BUFF_SIZE = 1024;byte buffer = new byte BUFF_SIZE ;java.io.InputStream in = null;java.io. OutputStream out = null;tryin = new FileInputStream( from );out = new FileOutputStream( to );while ( true ) synchronized ( buffer ) int amountRead = in.read( buffer ); if ( amountRead = -1 )

37、break; out.write( buffer, 0, amountRead ); finallyif ( in != null ) in.close();if ( out != null ) out.close();System.out.println(".Copy Finish");if (removeold)java.io.File file =new java.io.File(from);if (file.delete()System.out.println("delete file:"+file.getPath();file.delete()

38、;public static String getUploadPath(String path)if (path.indexOf("/")!=0)path = "/"+path;if (path.lastIndexOf("/")!=path.length()-1)path = path+"/"return path;/·õ·public static String getFullPath(String url,ServletContext context)url = url.repla

39、ce('', '/');String path = context.getRealPath(url);return path.replace('/', '');/·public static boolean deleteFile(String url,ServletContext context) throws Exceptionjava.io.File file =new java.io.File(getFullPath(url.replace('/', ''),context);Str

40、ing filepath = file.getPath();String ext = filepath.substring(filepath.lastIndexOf(".")+1);String minifilepath = filepath.substring(0,filepath.lastIndexOf(".")+"_mini."+ext;java.io.File minifile = new java.io.File(minifilepath);if (minifile.exists()minifile.delete();if

41、(file.exists()log.debug("delete file:"+file.getPath();return file.delete();return false;/·水¼ ·public static String createPathByDate(String url,ServletContext context)String fullpath = getFullPath(url,context);if (fullpath.lastIndexOf('')!=fullpath.length()-1)fullpath

42、 +=""Calendar nowtime = Calendar.getInstance();fullpath +=String.valueOf(nowtime.get(Calendar.YEAR)+""SimpleDateFormat sdf = new SimpleDateFormat("MMdd");fullpath+=sdf.format(nowtime.getTime()+""File file = new File(fullpath);if (!file.exists()file.mkdirs();if

43、 (url.lastIndexOf('')!=url.length()-1 && url.lastIndexOf('/')!=url.length()-1)url +="/"url += String.valueOf(nowtime.get(Calendar.YEAR)+"/"url += sdf.format(nowtime.getTime()+"/"return url;public static boolean createPath(String path,ServletContext context) throws ExceptionString fullpath = getFullPath(path,context);File file = new File(fullpath);boolean result= true;if (!file.exists()result =file.mkdirs();return result;/õµpublic static Strin