package com.ths.platform.framework.template;import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.Properties;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.app.VelocityEngine;public class VelocityParser
{//模板上下文private VelocityContext mainContext;//模板对象private Template mainTemplate;//模板引擎private VelocityEngine velocityEngine;//模板引擎初始化參数private  Properties properties;public static void main( String[ ] args ) {String filepath = "template/view.jsp";VelocityParser velocityParser = new VelocityParser( filepath );velocityParser.addToContext( "title" , "HelloWorld" );velocityParser.processTemplate( );}/*** @MethodName    : addToContext* @Description   : 向模板上下文中加入參数* @param key* @param value*/public void addToContext( String key, Object value ) {if ( mainContext == null ){mainContext = new VelocityContext( );}mainContext.put( key , value );}/*** @MethodName  : addToContext* @Description   :初始化模板上下文* @param chainCtx*/public void addToContext( VelocityContext chainCtx ) {mainContext = new VelocityContext( chainCtx );}/*** @MethodName    : processTemplate* @Description    : 输出到控制台*/public void processTemplate() {try{BufferedWriter writer = new BufferedWriter( new OutputStreamWriter( System.out ) );if ( mainTemplate != null ){mainTemplate.merge( mainContext , writer );}writer.flush( );writer.close( );}catch ( Exception ex ){ex.printStackTrace( );}}/*** @MethodName : processTemplate* @Description    : 输出到文件* @param destPath*/public void processTemplate(String destPath) {try{OutputStream os = new FileOutputStream(destPath);OutputStreamWriter writer = new OutputStreamWriter(os, "UTF-8");if ( mainTemplate != null ){mainTemplate.merge( mainContext , writer );}writer.flush( );writer.close( );}catch ( Exception ex ){ex.printStackTrace( );}}/*** 依据模板文件初始化模板引擎* @param templateFile*/public VelocityParser( String templateFile ) {this(templateFile , null);}/*** 依据模板文件和模板上下文（參数）初始化模板引擎* @param templateFile* @param chainContext*/public VelocityParser( String templateFile , VelocityContext chainContext ) {try{//新建模板引擎velocityEngine = new VelocityEngine( );//获取初始化參数properties = initProperties( );//初始化模板引擎velocityEngine.init( properties );//获取模板对象mainTemplate = velocityEngine.getTemplate( templateFile );//设置模板上下文if(chainContext!=null){//设置模板上下文mainContext = chainContext;}}catch ( Exception ex ){System.out.println( "Error processing template file: " + templateFile );}}/*** @MethodName : initProperties* @Description : 设置初始化參数* @return*/private Properties initProperties() {Properties properties = new Properties( );//设置从classpath中载入模板文件properties.setProperty( Velocity.FILE_RESOURCE_LOADER_PATH , Thread.currentThread( ).getContextClassLoader( ).getResource( "" ).getPath( ) );//解决模板中文乱码properties.setProperty( Velocity.INPUT_ENCODING , "utf-8" );properties.setProperty( Velocity.OUTPUT_ENCODING , "utf-8" );return properties;}}

 <table> <tr><td>$title</td></tr> </table>