public class HelloFreeMarker {
private Configuration cfg ;
public void init() throws Exception {
cfg = new Configuration();
cfg.setDirectoryForTemplateLoading(new File("src\\com\\s2freemarker\\exer\\templates"));
}
public void process() throws Exception{
Map<Object,Object> root = new HashMap<Object,Object>();
root.put("name", "FreeMarker");
root.put("msg", "First example for freemarker .");
Template t = cfg.getTemplate("test.ftl");
t.process(t, new OutputStreamWriter(System.out));
}
/**
* @param args
*/
public static void main(String[] args) throws Exception{
HelloFreeMarker hfm = new HelloFreeMarker();
hfm.init();
hfm.process();
}
}
模版文件：
${name},hello!${msg}
错误提示：
Aug 18, 2011 10:49:25 AM freemarker.log.JDK14LoggerFactory$JDK14Logger error
SEVERE: Expression msg is undefined on line 1, column 17 in test.ftl.
Expression msg is undefined on line 1, column 17 in test.ftl.
The problematic instruction:
----------
==> ${msg} [on line 1, column 15 in test.ftl]
----------
Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression msg is undefined on line 1, column 17 in test.ftl.
at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
at freemarker.core.Expression.getStringValue(Expression.java:118)
at freemarker.core.Expression.getStringValue(Expression.java:93)
at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:237)
at com.s2freemarker.exer.test.HelloFreeMarker.process(HelloFreeMarker.java:30)
at com.s2freemarker.exer.test.HelloFreeMarker.main(HelloFreeMarker.java:39)
test.ftl,hello!
Expression msg is undefined on line 1, column 17 in test.ftl.
The problematic instruction:
----------
==> ${msg} [on line 1, column 15 in test.ftl]
----------
Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression msg is undefined on line 1, column 17 in test.ftl.
at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
at freemarker.core.Expression.getStringValue(Expression.java:118)
at freemarker.core.Expression.getStringValue(Expression.java:93)
at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:237)
at com.s2freemarker.exer.test.HelloFreeMarker.process(HelloFreeMarker.java:30)
at com.s2freemarker.exer.test.HelloFreeMarker.main(HelloFreeMarker.java:39)
Exception in thread "main"
Expression msg is undefined on line 1, column 17 in test.ftl.
The problematic instruction:
----------
==> ${msg} [on line 1, column 15 in test.ftl]
----------
Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression msg is undefined on line 1, column 17 in test.ftl.
at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
at freemarker.core.Expression.getStringValue(Expression.java:118)
at freemarker.core.Expression.getStringValue(Expression.java:93)
at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:237)
at com.s2freemarker.exer.test.HelloFreeMarker.process(HelloFreeMarker.java:30)
at com.s2freemarker.exer.test.HelloFreeMarker.main(HelloFreeMarker.java:39)
