OGNL的使用范例

package com.itheima.struts2;


import java.util.HashMap;
import java.util.Map;


import ognl.Ognl;
import ognl.OgnlContext;
import ognl.OgnlException;


import org.junit.Test;


public class OGNLTest {

@Test
public void test() throws OgnlException{
/*
* ognl访问对象
*/
OgnlContext context = new OgnlContext();
Object value = Ognl.getValue("'hello'.length()", context,context.getRoot());
System.out.println(value);
}

@Test
public void test1() throws OgnlException{
/*
* ognl访问静态成员
*/
OgnlContext context = new OgnlContext();
Object value = Ognl.getValue("@java.lang.Math@PI", context, context.getRoot());
System.out.println(value);
}

@Test
public void test2() throws Exception{
/*
* ognl访问OgnlContext
*/
OgnlContext context = new OgnlContext();
Map<String, String> map = new HashMap<String, String>();
map.put("key1", "value1");
context.put("key2", "value2");
context.setRoot(map);
Object value1 = Ognl.getValue("key1", context, context.getRoot());//访问root中的内容
Object value2 = Ognl.getValue("#key2", context, context.getRoot());//访问OgnlContext中的内容
System.out.println(value1+"  "+value2);
}

@Test
public void test3(){
/*
* 直接获取root中的内容
*/
OgnlContext context = new OgnlContext();
context.setRoot("hello");
Object root = context.getRoot();
System.out.println(root);

}
}

最后

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