Ognl表達式(-), 前期準備

• ㈠下載Ognl的jar包,源碼及它所依賴的jar包:

http://grepcode.com/snapshot/repo1.maven.org/maven2/ognl/ognl/2.7.3/

在這個頁面中能夠找到它所依賴的jar包:

• Maven-Central / jboss / javassist
  3.7.ga
• Maven-Central / junit / junit
  3.8.1
• Maven-Central / org.easymock / easymock
  2.3
• JDK / jdk / openjdk
  6-b14

下載便可.

 

• ㈡創建一個java project,並加入相關的jar包(略)過
• ㈢建立一個簡單的helloworld程序,瞭解其基本過程:

 

/**
 * Copyright (C) Skywares Information Technology, LTD.
 * All Rights Reserved.
 *
 * TestOgnl.java created on 2013-1-14 下午4:39:03 by hubert.guo
 */
package com.skywares.ognl;

import ognl.Ognl;
import ognl.OgnlException;

/**
 * <pre>
 * Description
 * @TODO file description here
 *
 * @author hubert.guo
 * @since 1.0
 *
 * Change History
 * Date            Modifier        DESC.
 * 2013-1-14      hubert.guo         Initial version.
 * </pre>
 */
public class TestOgnl
{

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        try
        {
            Object result = Ognl.getValue("userName", new User("zhangSan",12));

            System.out.println(result.toString());
        }
        catch (OgnlException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}

class User
{
    private String userName;

    private Integer age;

    /**
     *
     */
    public User(String userName, Integer age)
    {
        // TODO Auto-generated constructor stub
        this.userName = userName;
        this.age = age;
    }

    /**
     * @return the userName
     */
    public String getUserName()
    {
        return userName;
    }

    /**
     * @param userName
     *            the userName to set
     */
    public void setUserName(String userName)
    {
        this.userName = userName;
    }

    /**
     * @return the age
     */
    public Integer getAge()
    {
        return age;
    }

    /**
     * @param age
     *            the age to set
     */
    public void setAge(Integer age)
    {
        this.age = age;
    }

}

 

並在35行設定斷點,關聯源代碼,以調試方式開始瞭解OGNL表達式的實現方式和原理.