package com.jh.core.util;
import java.io.StringWriter;
import java.util.Map;
import java.util.Properties;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.exception.ParseErrorException;
import com.jh.app.util.Globle;
public class VelocityUtil
{
static VelocityEngine ve=null;
public static VelocityEngine velocity()
{
if(ve!=null){
return ve;
}
ve = new VelocityEngine();
Properties p = new Properties();
p.setProperty(Velocity.RUNTIME_LOG, "velocity_jh.log");
p.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, Globle.VM_PATH);
try
{
ve.init(p);
}
catch(Exception e)
{
e.printStackTrace();
}
return ve;
}
public static void main(String args[])
{
try
{
Velocity.init();
}
catch(Exception e)
{
System.out.println("Problem initializing Velocity : " + e);
return;
}
VelocityContext context = new VelocityContext();
TTT tt= new TTT();
tt.setSs("vvvvvvvv");
tt.setQq("qqq");
context.put("tt", tt);
context.put("name", "Velocity");
context.put("project", "Jakarta");
StringWriter w = new StringWriter();
// try
// {
// velocity().mergeTemplate("example2.vm", context, w);
// }
// catch(Exception e)
// {
// System.out.println("Problem merging template : " + e);
// }
System.out.println(" template : " + w);
// String s = "We are using $project $name to render this.\n #parse(\"example2.vm\")";
String s = " ${tt.qq}_dd ";
w = new StringWriter();
try
{
velocity().evaluate(context, w, "mystring", s);
}
catch(ParseErrorException pee)
{
System.out.println("ParseErrorException : " + pee);
}
catch(MethodInvocationException mee)
{
System.out.println("MethodInvocationException : " + mee);
}
catch(Exception e)
{
System.out.println("Exception : " + e);
}
System.out.println(" string : " + w);
}
public static String evaluate(String vmText, Map map, String logTag)
{
// System.out.println(vmText);
StringWriter w = new StringWriter();
VelocityContext context = new VelocityContext();
if(map != null)
{
java.util.Iterator it = map.keySet().iterator();
while(it.hasNext())
{
Object obj = it.next();
if(obj instanceof String)
context.put((String) obj, map.get(obj));
}
}
try
{
velocity().evaluate(context, w, logTag, vmText);
}
catch(ParseErrorException pee)
{
System.out.println("ParseErrorException : " + pee);
}
catch(MethodInvocationException mee)
{
System.out.println("MethodInvocationException : " + mee);
}
catch(Exception e)
{
System.out.println("Exception : " + e);
}
return w.toString();
}
public static String mergeVM(String vmFile, Map map)
{
StringWriter w = new StringWriter();
VelocityContext context = new VelocityContext();
if(map != null)
{
java.util.Iterator it = map.keySet().iterator();
while(it.hasNext())
{
Object obj = it.next();
if(obj instanceof String)
context.put((String) obj, map.get(obj));
}
}
try
{
velocity().mergeTemplate(vmFile, context, w);
}
catch(ParseErrorException pee)
{
System.out.println("ParseErrorException : " + pee);
}
catch(MethodInvocationException mee)
{
System.out.println("MethodInvocationException : " + mee);
}
catch(Exception e)
{
System.out.println("Exception : " + e);
}
return w.toString();
}
}
package com.jh.app.util;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.exception.ResourceNotFoundException;
public class VelocityUtil
{
public static String GLOBLE_VM_PATH = "/usr/bj_app/ROOT";
private static VelocityEngine ve =null;
synchronized public static VelocityEngine velocity()
{
if(ve!=null) return ve;
ve = new VelocityEngine();
Properties p = new Properties();
p.setProperty(Velocity.RUNTIME_LOG, "velocity_jh.log");
p.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, GLOBLE_VM_PATH);
try
{
ve.init(p);
}
catch (Exception e)
{
e.printStackTrace();
}
return ve;
}
public static void main(String args[]){
Map map=new HashMap();
map.put("Name", "王立昌");
map.put("util", new UtilObj());
System.out.println(evaluate("Hello $Name !" +
"" +
" #set ( $dao = $util.getDao(\"cms\") ) \n"+
" #set ( $sql = \"select * from News_tab order by NewsId desc limit 10 \") \n"+
" #set ( $className = \"com.jh.app.tag.app.News\") \n"+
" #set ( $clazz = $util.classForName($className) ) \n" +
" $sql \n"+
" #set ( $list = $dao.getObjList( $sql,$clazz)) \n"+
" #foreach( $obj in $list ) \n"+
" $obj.Title \n"+
" #end \n"+
" \n"
,map,"test"));
}
public static String evaluate(String vmText, Map map, String logTag)
{
System.err.println("########################");
System.err.println(vmText);
System.err.println("########################");
StringWriter w = new StringWriter();
VelocityContext context = new VelocityContext();
if (map != null)
{
java.util.Iterator it = map.keySet().iterator();
while (it.hasNext())
{
Object obj = it.next();
if (obj instanceof String)
context.put((String) obj, map.get(obj));
}
}
try
{
velocity().evaluate(context, w, logTag, vmText);
}
catch (ResourceNotFoundException e)
{
//该处理是为了避免包含的文档不存在而做的处理.
String msg = "org.apache.velocity.exception.ResourceNotFoundException: Unable to find resource ";
String str = e.toString();
if (str.indexOf(msg) < 0)
return "";
str = str.replaceAll(msg, "");
str = str.replaceAll("'", "");
String fileName = GLOBLE_VM_PATH + "/" + str;
writeStrFile(fileName, "");
return evaluate(vmText, map, logTag);
}
catch (Exception e)
{
e.printStackTrace();
}
return w.toString();
}
public synchronized static boolean writeStrFile(String strFileName, String strContent)
{
if (strFileName.trim().equals(""))
return true;
int indx = strFileName.lastIndexOf("/");
if (indx >= 0)
{
String strDir = strFileName.substring(0, indx);
File f = new File(strDir);
if (!f.exists())
f.mkdirs();
}
try
{
FileOutputStream fos = new FileOutputStream(strFileName);
try
{
OutputStreamWriter o = new OutputStreamWriter(fos, "GBK");
o.write(strContent);
fos.flush();
o.close();
}
finally
{
fos.close();
}
}
catch (Exception e)
{
e.printStackTrace();
}
return true;
}
public static String mergeVM(String vmFile, Map map)
{
StringWriter w = new StringWriter();
VelocityContext context = new VelocityContext();
if (map != null)
{
java.util.Iterator it = map.keySet().iterator();
while (it.hasNext())
{
Object obj = it.next();
if (obj instanceof String)
context.put((String) obj, map.get(obj));
}
}
try
{
velocity().mergeTemplate(vmFile, context, w);
}
catch (Exception e)
{
e.printStackTrace();
}
return w.toString();
}
}
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