JavaEE(2)

1. 应用服务器默认添加的系统属性

NetBeans创建java web project(ctxTest) (index.jsp)

<%@page import="java.util.Properties"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <table>
            <%
                Properties props = System.getProperties();
                for (String name : props.stringPropertyNames()) {
                    out.println("<tr><td>" + name + ": </td><td>" + props.getProperty(name) + "</td></tr>" );
                }
            %>
        </table>

    </body>
</html>

访问：http://localhost:7001/ctxTest/index.jsp

2. 文件系统的命名服务 (需要fscontext.jar和providerutil.jar)

NetBeans创建java project(fsContext): (NameServiceTest.java)

package lee;

import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

public class NameServiceTest {
    public static void main(String[] args) throws NamingException{
        final String fileName = "00.目录.docx";
        final String dirName = "codes";
        
        Hashtable env = new Hashtable();
        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.fscontext.RefFSContextFactory");
        env.put(Context.PROVIDER_URL, "file:/D:/JavaEE Traditional/FSContextTest");
        
        Context ctx = new InitialContext(env);
        
        Object file = ctx.lookup(fileName);
        System.out.println(fileName+ " 名称被绑定到: " + file);
        System.out.println("file的类型是：" + file.getClass());

        Object dir = ctx.lookup(dirName);
        System.out.println(dirName + " 名称被绑定到: " + dir);
        System.out.println("dir的类型是：" + dir.getClass());

        ctx.close();
    }  
}

NameServiceTest2.java

package lee;

import javax.naming.*;
import java.util.*;

public class NameServiceTest2
{
    public static void main(String[] args) throws NamingException
    {
        final String fileName = "youandme.mp3";
        final String newName = "油和米.mp3";
        final String dirName = "Beyond";
        final String newDir1 = "newDir1";
        final String newDir2 = "newDir2";

        Hashtable env = new Hashtable();
        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.fscontext.RefFSContextFactory");
        env.put(Context.PROVIDER_URL, "file://D:/JavaEE Traditional/FSContextTest/music");
                
        Context ctx = new InitialContext(env);
                
        try {
        　　ctx.rename(newName , fileName);
        }
        catch (Exception ex) {
        }
                
        try {
        　　ctx.destroySubcontext(newDir1);
        }
        catch (Exception ex) {
        }

        NamingEnumeration<Binding> bindings = ctx.listBindings("");
        while(bindings.hasMore())
        {
            Binding binding = bindings.next();
            System.out.println(binding.getName() + " --> " + binding.getObject());
        }

        bindings = ctx.listBindings(dirName);
        System.out.println("------下面是Beyond Context下的绑定------");
        while(bindings.hasMore())
        {
            Binding binding = bindings.next();
            System.out.println(binding.getName() + " --> " + binding.getObject());
        }

        ctx.createSubcontext(newDir1);
        ctx.createSubcontext(newDir2);

        ctx.destroySubcontext(newDir2);
        ctx.rename(fileName , newName);

        ctx.close();
    }
}

3. Weblogic的JNDI支持

Enviroment-->Servers-->AdminServer(admin)-->View JNDI Tree

NetBeans创建java web project(bindTest) (index.jsp)

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import="javax.naming.*,javax.swing.*"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>测试JNDI绑定</title>
    </head>
    <body>
        <%
            Context ctx = new InitialContext(); 
            
            final String TEST_JNDI = "testName";
            java.util.Date date = new java.util.Date();
            
            ctx.rebind(TEST_JNDI, date);
            
            out.println("<h3>JNDI绑定成功</h3>");
        %>
    </body>
</html>

访问：http://localhost:7001/bindTest/index.jsp

客户端程序JNDI查找：

NetBeans创建java project(jndiTest): (JNDIClient.java)

(需要webservices.jar和wlclient.jar)

package lee;

import java.util.*;
import javax.naming.*;
import javax.swing.*;

public class JNDIClient {

    public static void main(String[] args) throws Exception {
        final String INIT_FACTORY = "weblogic.jndi.WLInitialContextFactory";
        final String WL_URL = "t3://localhost:7001";
        
        Hashtable props = new Hashtable();
        props.put(Context.INITIAL_CONTEXT_FACTORY, INIT_FACTORY);
        props.put(Context.PROVIDER_URL, WL_URL);
        
        //    如果需要安全控制，则需要如下两行代码
        //    props.put(Context.SECURITY_PRINCIPAL, "weblogic");
        //    props.put(Context.SECURITY_CREDENTIALS, "weblogic");
        
        //初始化Context，使用InitialContext初始化Context
        Context ctx = new InitialContext(props);
        
        //通过JNDI查找对象，该对象是一个java.util.Date对象。
        Object obj = ctx.lookup("testName");
        System.out.println(obj);
    }
}

输出： Sat Jan 24 22:12:32 CST 2015