cn.hutool.extra.template.engine.velocity.VelocityTemplate Maven / Gradle / Ivy
package cn.hutool.extra.template.engine.velocity;
import cn.hutool.core.convert.Convert;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.lang.TypeReference;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.extra.template.AbstractTemplate;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import java.io.OutputStream;
import java.io.Serializable;
import java.io.Writer;
import java.util.Map;
/**
* Velocity模板包装
*
* @author looly
*
*/
public class VelocityTemplate extends AbstractTemplate implements Serializable {
private static final long serialVersionUID = -132774960373894911L;
private final org.apache.velocity.Template rawTemplate;
private String charset;
/**
* 包装Velocity模板
*
* @param template Velocity的模板对象 {@link org.apache.velocity.Template}
* @return VelocityTemplate
*/
public static VelocityTemplate wrap(org.apache.velocity.Template template) {
return (null == template) ? null : new VelocityTemplate(template);
}
/**
* 构造
*
* @param rawTemplate Velocity模板对象
*/
public VelocityTemplate(org.apache.velocity.Template rawTemplate) {
this.rawTemplate = rawTemplate;
}
@Override
public void render(Map bindingMap, Writer writer) {
rawTemplate.merge(toContext(bindingMap), writer);
IoUtil.flush(writer);
}
@Override
public void render(Map bindingMap, OutputStream out) {
if(null == charset) {
loadEncoding();
}
render(bindingMap, IoUtil.getWriter(out, CharsetUtil.charset(this.charset)));
}
/**
* 将Map转为VelocityContext
*
* @param bindingMap 参数绑定的Map
* @return {@link VelocityContext}
*/
private VelocityContext toContext(Map bindingMap) {
final Map map = Convert.convert(new TypeReference>() {}, bindingMap);
return new VelocityContext(map);
}
/**
* 加载可用的Velocity中预定义的编码
*/
private void loadEncoding() {
final String charset = (String) Velocity.getProperty(Velocity.INPUT_ENCODING);
this.charset = StrUtil.isEmpty(charset) ? CharsetUtil.UTF_8 : charset;
}
}