UtilTemplate.java
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package com.taover.util;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
public class UtilTemplate {
/**
* 通过velocity引擎渲染模板文件,模板所在类路径
* @param templateClassPath
* @param data
* @return
*/
public static String renderTemplateClass(String templateClassPath, Map<String, Object> data){
//初始化
VelocityEngine ve = new VelocityEngine();
Properties p = new Properties();
p.put("runtime.log.logsystem.class", "org.apache.velocity.runtime.log.SimpleLog4JLogSystem");
p.put("runtime.log.logsystem.log4j.category", "velocity");
p.put("runtime.log.logsystem.log4j.logger", "velocity");
p.put(VelocityEngine.INPUT_ENCODING, "UTF-8");
p.put(VelocityEngine.OUTPUT_ENCODING, "UTF-8");
p.put(VelocityEngine.ENCODING_DEFAULT, "UTF-8");
p.put("file.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
try {
ve.init(p);
} catch (Exception e) {
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw, true));
Log log = LogFactory.getLog(UtilTemplate.class);
log.error(sw.toString());
}
//取得VelocityContext对象
VelocityContext context = new VelocityContext();
//向context中放入要在模板中用到的数据对象
if(data != null){
Set<String> keySet = data.keySet();
Iterator<String> iter = keySet.iterator();
while(iter.hasNext()){
String key = iter.next();
context.put(key, data.get(key));
}
}
//选择要用到的模板
if( !ve.resourceExists(templateClassPath) ){
return null;
}
Template template;
StringWriter sw = new StringWriter();
try {
template = ve.getTemplate(templateClassPath, "UTF-8");
//合并输出
template.merge( context, sw);
} catch (Exception e) {
StringWriter swE = new StringWriter();
e.printStackTrace(new PrintWriter(swE, true));
Log log = LogFactory.getLog(UtilTemplate.class);
log.error(sw.toString());
}
return sw.toString();
}
}