[计算机]freemarker根据模版生成文件使用例子.doc

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,String 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 setClassName(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 setClassPath(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 sequence;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.ObjectWrapper;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 (templateconfig=null)templateconfig = new Configuration();templateconfig.setTemplateExceptionHandler(TemplateExceptionHandler.HTML_DEBUG_HANDLER);templateconfig.setObjectWrapper(ObjectWrapper.DEFAULT_WRAPPER);templateconfig.setTemplateLoader(new ClassTemplateLoader(this.getClass(),/);templateconfig.setTemplateUpdateDelay(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 writer = 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 pwriter = new PrintWriter(fos);pwriter.write(writer.toString();pwriter.close();fos.close(); catch (Exception ex)ex.printStackTrace();5. 模版hibernate3.ftl column name=$property.field?upper_case length=$property.lengthcolumn name=$property.field?upper_case precision=$property.length scale=0 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.table.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.servlet.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(parameter,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 key)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 HTMLEncode(String txt) if (txt!=null & txt.length()0)txt=txt.replaceAll(&,&);txt=txt.replaceAll(,>);txt=txt.replaceAll(,");txt=txt.replaceAll(,’);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) 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 getFileContent(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()InputStreamReader 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();return 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 addTimeByMinutes(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 ExceptionCalendar calendar=Calendar.getInstance(); calendar.setTime(date); calendar.set(Calendar.SECOND,calendar.get(Calendar.SECOND)+seconds);return calendar.getTime();/public static java.util.Date nowTime() throws ExceptionSimpleDateFormat sdf = new SimpleDateFormat(yyyy-MM-dd);String datestr = sdf.format(java.util.Calendar.getInstance().getTime();return sdf.parse(datestr);/public static java.util.Date nowFullTime() throws ExceptionSimpleDateFormat sdf = new SimpleDateFormat(yyyy-MM-dd HH:mm:ss);String datestr = sdf.format(java.util.Calendar.getInstance().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 convertDateStrToString(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 static 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);return 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);result = 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 SimpleDateFormat(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()+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.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 ) 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();public static String getUploadPath(String path)if (path.indexOf(/)!=0)path = /+path;if (path.lastIndexOf(/)!=path.length()-1)path = path+/;return path;/public static String getFullPath(String url,ServletContext context)url = url.replace(, /);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);String 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 (file.exists()log.debug(delete file:+file.getPath();return file.delete();return false;/水 public static String createPathByDate(String url,ServletContext context)String fullpath = getFullPath(url,context);if (fullpath.lastIndexOf()!=fullpath.length()-1)fullpath +=;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 (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;/public static String getContextUrl(String url,HttpServletRequest request,ServletCo