在Velocity模板中传递Java函数
我被困在这上面了在Velocity模板中传递Java函数,java,velocity,vtl,Java,Velocity,Vtl,我被困在这上面了 public String getMessage(String id) { log.error("passing parameter "+id+" "+id.getClass().getName()); if(id.compareTo("1")==0) { return "nothing perfect"; } else {return "All done";} } .vm #set($parameter=“1”) #s
public String getMessage(String id)
{
log.error("passing parameter "+id+" "+id.getClass().getName());
if(id.compareTo("1")==0)
{
return "nothing perfect";
}
else {return "All done";}
}
.vm
#set($parameter=“1”)
#set($message=$action.getMessage(“$parameter”).show())
$message`
在呈现的HTML中,我得到$message
。为什么我没有得到真正的信息
你们不能直接以速度传递函数
Test.java
Message.java
example.vm
#set($parameter=“1”)
#set($message=$formatter.message($parameter))
$message
你们不能直接以速度传递函数
Test.java
Message.java
example.vm
#set($parameter=“1”)
#set($message=$formatter.message($parameter))
$message
来自Velocity文档:
Velocity只是真实Java对象的一个外表
因此,要访问Velocity模板中类的公共方法,相关类的对象应该对Velocity模板可见
public class MessageSource {
public String getMessage(String id){
log.error("passing parameter "+id+" "+id.getClass().getName());
if(id.compareTo("1")==0){
return "nothing perfect";
} else {
return "All done";
}
}
}
现在公开MessageSource
的对象:
/* first, get and initialize an engine */
VelocityEngine ve = new VelocityEngine();
ve.init();
/* next, get the Template */
Template t = ve.getTemplate( "helloworld.vm" );
/* create a context and add data */
VelocityContext context = new VelocityContext();
context.put("messageSource", new MessageSource());
/* now render the template into a StringWriter */
StringWriter writer = new StringWriter();
t.merge( context, writer );
/* show the World */
System.out.println( writer.toString() );
所以,在你的速度模板中
$messageSource.getMessage("identifier")
public class MessageSource {
public String getMessage(String id){
log.error("passing parameter "+id+" "+id.getClass().getName());
if(id.compareTo("1")==0){
return "nothing perfect";
} else {
return "All done";
}
}
}
现在公开MessageSource
的对象:
/* first, get and initialize an engine */
VelocityEngine ve = new VelocityEngine();
ve.init();
/* next, get the Template */
Template t = ve.getTemplate( "helloworld.vm" );
/* create a context and add data */
VelocityContext context = new VelocityContext();
context.put("messageSource", new MessageSource());
/* now render the template into a StringWriter */
StringWriter writer = new StringWriter();
t.merge( context, writer );
/* show the World */
System.out.println( writer.toString() );
所以,在你的速度模板中
$messageSource.getMessage("identifier")
$messageSource.getMessage("identifier")