测试发帖

/**
* 导入插件
*/
public void add(String path)
{
try
{
JarFile jar = new JarFile(path);
InputStream in =jar.getInputStream(jar.getEntry("com/chinasoft/exam/properties/plugin.xml"));
DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance();
    //加载插件信息
DocumentBuilder dombuilder = domfac.newDocumentBuilder();
    Document doc  = dombuilder.parse(in);
    // 获取要节点对象
        Element root = doc.getDocumentElement();
        NodeList nodeList = root.getChildNodes();
        if(nodeList != null && infoSet.get(root.getAttribute("name"))== null)
        {
            //储存插件信息
         for (int i = 0; i<nodeList.getLength(); i++)
            {
             HashMap<String, String> item = new HashMap<String, String>();

             String key = null;
String value = null;

             if (nodeList.item(i).getNodeType() == Node.ELEMENT_NODE  && nodeList.item(i).getNodeName().equals("item"))
{
for (Node node = nodeList.item(i).getFirstChild(); node != null; node = node.getNextSibling())
{
if (node.getNodeType() == Node.ELEMENT_NODE && node.getNodeName().equals("key"))
{
key = node.getFirstChild().getNodeValue();
}
if (node.getNodeType() == Node.ELEMENT_NODE && node.getNodeName().equals("value"))
{
value = node.getFirstChild().getNodeValue();
}
}
if(key != null || value != null)
{
item.put(key, value);
if(item.get(key) != null)
{
infoList.add(item);
}
}
}
else if (nodeList.item(i).getNodeType() == Node.ELEMENT_NODE && nodeList.item(i).getNodeName().equals("author"))
{
for (Node node = nodeList.item(i).getFirstChild(); node != null; node = node.getNextSibling())
{
if (node.getNodeType() == Node.ELEMENT_NODE  && !node.getNodeName().equals("#text"))
{
key = node.getNodeName();
value = node.getFirstChild().getNodeValue();
item.put(key, value);
if(infoList.indexOf(item) <0 )
{
infoList.add(item);
}
}
}
}
            }
         //保存插件信息
        infoSet.put(root.getAttribute("name"), infoList);

        //加载插件调用方法的类
        File   file   =   new   File(path);
        URL   url   =   file.toURI().toURL();
        URLClassLoader   loader   =   new   URLClassLoader(new   URL[]   {   url   });
        Class   classDefine   =   Class.forName( "com.huawei.MyPlugin",   true,   loader);
pluginSet.put(root.getAttribute("name"), classDefine);

        System.out.println("\n\n插件导入成功");
        }
        else
        {
         System.out.println("\n\n插件已存在。");
        }
}
catch(Exception e)
{
System.out.println("\n\n文件不存在。");
    }
}

/**
* 显示插件信息
* @param name 插件名称
*/
public void showInfo(String pluginName)
{
infoList = infoSet.get(pluginName);
if(infoList != null)
{
System.out.println("\n\n" + pluginName + "插件的信息：");
for(HashMap<String, String> infomap : infoList)
{
Iterator i = infomap.keySet().iterator();
while(i.hasNext()){
    Object o = i.next();
    String key = o.toString();
    //System.out.print(key +", ");
    System.out.println(key + ": " + infomap.get(key));
}
}
}

else
{
System.out.println("\n\n插件不存在");
}
}

/**
* 显示插件列表
*/
public void showList()
{
if(!infoSet.isEmpty())
{
Iterator i = infoSet.keySet().iterator();
System.out.println("\n\n插件列表为：");
while(i.hasNext())
{
Object o = i.next();
String pluginName = o.toString();
System.out.println(pluginName);
}
}
else
{
System.out.println("\n\n没有已经导入的插件");
}
}

/**
* 移除插件
* @param name 插件名称
*/
public void removePlugin(String pluginName)
{
infoList = infoSet.get(pluginName);
if(infoList != null)
{
infoSet.remove(pluginName);
System.out.println("\n\n插件移除成功");
}
else
{
System.out.println("\n\n插件不存在");
}
}

/**
* 调用引入的插件方法
* @param pluginName 插件名称
* @param parm 方法参数
*/
public void callMethod(String pluginName ,String parm)
{
Class<?> pluginObject = pluginSet.get(pluginName);
if(pluginObject != null)
{
Class[] paramTypes = new Class[] { String.class};// 参数类型数组
Object[] params = new Object[] {parm};// 参数值数组
try
{
Method method = pluginObject.getDeclaredMethod("call", paramTypes);// 获取方法实例
method.invoke(pluginObject.newInstance(), params);// 调用call方法并返回Plugin实例
}
catch (Exception err)
{
err.printStackTrace();
}

}
else
{
System.out.println("\n\n插件不存在");
}
}
}

CommandManager.java
package com.mc.test;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;public class CommandManager
{
    private Plugin plugin;
    private boolean isExit = false;

    public CommandManager()
    {
     plugin = Plugin.getInstance();
    }

    public void getCommand()
    {
     Scanner scanner = new Scanner(System.in);
     while(!isExit)
     {
     System.out.print(">>");
     InputStreamReader inputStreamReader=new InputStreamReader(System.in);
     BufferedReader bufferedReader=new BufferedReader(inputStreamReader);
     try
     {
     this.handleCommand(bufferedReader.readLine());

     }catch(IOException err)
     {
     System.out.print("本系统还很弱小，请不要乱按键");
     }
     }
    }

    private void handleCommand(String command)
    {
     String[] commands = command.split(" ");
        String commandKey = commands[0];

        if(commandKey.equals("add") && commands.length >= 2)
        {
         plugin.add(commands[1]);
        }
        else if(commandKey.equals("list"))
        {
         plugin.showList();
        }
        else if(commandKey.equals("info") && commands.length >= 2)
        {
         plugin.showInfo(commands[1]);
        }
        else if(commandKey.equals("remove") && commands.length >= 2)
        {
         plugin.removePlugin(commands[1]);
        }
        else if(commandKey.equals("call") && commands.length >= 3)
        {
         plugin.callMethod(commands[1], commands[2]);
        }
        else
        {
         System.out.println("\n\n命令无法识别");
        }

    }

    private void exitSystem()
    {
     this.isExit = true;
     System.out.print("\n\n欢迎再次使用本系统");
    }

    public static void main(String[] args)
    {
     CommandManager commandManager = new CommandManager();
     commandManager.getCommand();
    }
}

com/chinasoft/exam/properties/plugin.xml
管理系统插件？？？？？？？？？？？？？？？

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