freemarker 解析字符串模板

转载自 http://balaschen.iteye.com/blog/51591

package freemarker.loader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.HashMap;
import java.util.Map;
import freemarker.cache.TemplateLoader;
/**
* @author Keven Chen
* @version $Revision 1.0 $
*
*/
public class StringTemplateLoader implements TemplateLoader {
private static final String DEFAULT_TEMPLATE_KEY = "_default_template_key";
private Map templates = new HashMap();

public StringTemplateLoader(String defaultTemplate){
if(defaultTemplate != null && !defaultTemplate.equals("")){
templates.put(DEFAULT_TEMPLATE_KEY, defaultTemplate);
}
}

public void AddTemplate(String name,String template){
if(name == null || template == null
|| name.equals("") || template.equals("")){
return ;
}
if(!templates.containsKey(name)){
templates.put(name, template);
}
}

public void closeTemplateSource(Object templateSource) throws IOException {

}
public Object findTemplateSource(String name) throws IOException {
if(name == null || name.equals("")){
name = DEFAULT_TEMPLATE_KEY;
}
return templates.get(name);
}
public long getLastModified(Object templateSource) {
return 0;
}
public Reader getReader(Object templateSource, String encoding)
throws IOException {
return new StringReader((String) templateSource);
}
}

/**
* Created: 2007-2-1
* Modified: 2007-2-1
*
* Author: Keven Chen
*/
package freemarker;

import java.io.File;
import java.io.OutputStreamWriter;
import java.io.StringWriter;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import freemarker.loader.ClassPathTemplateLoader;
import freemarker.loader.StringTemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.Template;

/**
* @author Keven Chen
* @version $Revision 1.0 $
*
*/
public class Test {

public static void main(String[] args) throws Exception {
Configuration cfg = new Configuration();
cfg.setTemplateLoader(new StringTemplateLoader("欢迎：${user}"));
cfg.setDefaultEncoding("UTF-8");

Template template = cfg.getTemplate("");

Map root = new HashMap();
root.put("user", "Keven Chen");

StringWriter writer = new StringWriter();
template.process(root, writer);
System.out.println(writer.toString());
}

}