freemarker读取bean出错

herowzz 2008-08-01 10:56:44

Test.java



package org.test; 



import java.util.*; 

import java.io.*; 

import freemarker.template.*; 



public class Test { 



public static void main(String[] args) throws Exception { 

Configuration cfg = new Configuration(); 

cfg.setDirectoryForTemplateLoading(new File("E:/new")); 

cfg.setObjectWrapper(new DefaultObjectWrapper()); 

Template temp = cfg.getTemplate("test.ftl"); 



User user = new User(); 

user.setId("1"); 

user.setAge("88"); 

user.setName("ttt"); 

Map root = new HashMap(); 

root.put("user", user); 



Writer out = new OutputStreamWriter(System.out); 

temp.process(root, out); 

out.flush(); 

System.out.println("\nOK!"); 

} 



} 



class User { 

private String id; 

private String name; 

private String age; 



public String getId() { 

return id; 

} 



public void setId(String id) { 

this.id = id; 

} 



public String getName() { 

return name; 

} 



public void setName(String name) { 

this.name = name; 

} 



public String getAge() { 

return age; 

} 



public void setAge(String age) { 

this.age = age; 

} 

}

test.ftl



<html> 

<head> 

<title>Welcome</title> 

</head> 

<body> 

<h1>Welcome </h1> 

id:${user.id}<br> 

name:${user.name}<br> 

age:${user.age}<br> 

</body> 

</html>

错误：
2008-8-1 10:50:44 freemarker.log.JDK14LoggerFactory$JDK14Logger error
严重:

Expression user.id is undefined on line 7, column 6 in test.ftl.
The problematic instruction:
----------
==> ${user.id} [on line 7, column 4 in test.ftl]
----------

Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression user.id is undefined on line 7, column 6 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:208)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:208)
at freemarker.core.Environment.process(Environment.java:188)
at freemarker.template.Template.process(Template.java:237)
at org.test.Test.main(Test.java:23)
Exception in thread "main"
Expression user.id is undefined on line 7, column 6 in test.ftl.
The problematic instruction:
----------
==> ${user.id} [on line 7, column 4 in test.ftl]
----------

Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression user.id is undefined on line 7, column 6 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:208)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:208)
at freemarker.core.Environment.process(Environment.java:188)
at freemarker.template.Template.process(Template.java:237)
at org.test.Test.main(Test.java:23)

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晓1984 2009-06-15

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请设置为 cfg.setObjectWrapper(ObjectWrapper.BEANS_WRAPPER);

thomas.he 2008-10-22

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freemarker.core.InvalidReferenceException: 我也是这样的问题

zhkchi 2008-08-01

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class User {
改成public class User

herowzz 2008-08-01

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herowzz 2008-08-01

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[Quote=引用 3 楼 zhkchi 的回复:]
class User {
改成public class User
[/Quote]

晕，果然是public的原因。。。
谢谢了。

天外流星 2008-08-01

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Template + data model = output

参考:

/* Get or create a template */

        Template temp = cfg.getTemplate("test.ftl");

        /* Create a data model */

        Map root = new HashMap();

        root.put("user", "Big Joe");

        Map latest = new HashMap();

        root.put("latestProduct", latest);

        latest.put("url", "products/greenmouse.html");

        latest.put("name", "green mouse");

        /* Merge data model with template */

        Writer out = new OutputStreamWriter(System.out);

        temp.process(root, out);

        out.flush();