//Merge two JSON objects  JSONObject obj1 = new JSONObject();  obj1.put("name","foo");  obj1.put("num",new Integer(100));  obj1.put("balance",new Double(1000.21));

  JSONObject obj2 = new JSONObject();  obj2.put("is_vip",new Boolean(true));  obj2.put("nickname",null);  obj2.putAll(obj1);  System.out.print(obj2);

 String json = "{"         + "  \"query\": \"Pizza\", "         + "  \"locations\": [ 94043, 90210 ] "         + "}";

 JSONObject object = (JSONObject) new  JSONTokener(json).nextValue(); String query = object.getString("query"); JSONArray locations = object.getJSONArray("locations");

package com.beliefbetrayal.clazz;

public class ClassFileTest {

    private int m;

    public int getM() {        return m;    }

    public void setM(int m) {        this.m = m;    }}

 1 package loci.jndi; 2  3 /** 4  * @author yaohw 5  * 6  */ 7 public interface JndiIService { 8      9     String fun();10     11     String getField();12 13 }

package loci.jndi;

import javax.naming.NamingException;import javax.naming.Reference;import javax.naming.Referenceable;import javax.naming.StringRefAddr;

/** * @author yaohw * */public class JndiService implements Referenceable,JndiIService{

    String field;    /* (non-Javadoc)     * @see javax.naming.Referenceable#getReference()     */    @Override    public Reference getReference() throws NamingException {           //Reference是对象的引用，Context中存放的是Reference，为了从Reference中还原出对象实例，           //我们需要添加field，它们是创建对象实例的线索。在JndiService中，field是个线索。           Reference ref=new Reference(getClass().getName(),JndiServiceFactory.class.getName(),null);           ref.add(new StringRefAddr("field",field));           return ref;    }

    /* (non-Javadoc)     * @see loci.jndi.JndiIService#fun()     */    @Override    public String fun() {        // TODO Auto-generated method stub        System.out.println("test fun from jndi. field:"+field);        return field;    }

    public void setProperty(int index,String property){        field=property;    }

    /**     * @return the field     */    public String getField() {        return field;    }

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

JndiServiceFactory的实现为：

 1 import javax.naming.Context; 2 import javax.naming.Name; 3 import javax.naming.Reference; 4 import javax.naming.spi.ObjectFactory; 5  6 /** 7  * @author yaohw 8  *  9  */10 public class JndiServiceFactory implements ObjectFactory {11 12     /*13      * (non-Javadoc)14      * @see javax.naming.spi.ObjectFactory#getObjectInstance(java.lang.Object,15      * javax.naming.Name, javax.naming.Context, java.util.Hashtable)16 */17     @Override18     public Object getObjectInstance(Object obj, Name name, Context nameCtx,19             Hashtable<?, ?> environment) throws Exception {20         if (obj instanceof Reference) {21             JndiService jndiService = new JndiService();22             Reference ref=(Reference)obj;23             String field = (String)ref.get("field").getContent();24             jndiService.setProperty(0, field);25             return jndiService;26         }27         return null;28     }29 30 }

服务已经准备好了，接下来就是注册到JNDI上，并从JNDI获取

注册过程在JndiContainer中完成：

package loci.jndi;

import java.io.InputStream;import java.util.Hashtable;import java.util.Properties;

import javax.naming.Context;import javax.naming.InitialContext;import javax.naming.NamingException;

/** * @author yaohw *  */public class JndiContainer {

    private Context ctx = null;

    public void init() throws Exception {        // 初始化JNDI提供者。        Hashtable env = new Hashtable();        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.fscontext.RefFSContextFactory");        env.put(Context.PROVIDER_URL, "file:/c:/sample"); // fscontext的初始目录，我们需要在c:\下创建sample目录。        ctx = new InitialContext(env);        loadServices();    }

    // 从配置文件JNDIContainer.properties中读取JndiService的实现，绑定到Context中。    private void loadServices() throws Exception {        InputStream in = getClass().getResourceAsStream("JndiContainer.properties");        Properties props = new Properties();        props.load(in);

        // inject jndiservice        String s = props.getProperty("JndiServiceClass");        Object obj = Class.forName(s).newInstance();        if (obj instanceof JndiService) {            JndiService service = (JndiService) obj;            String[] ss = props.getProperty("JndiServiceProperty").split(";");            for (int i = 0; i < ss.length; i++)                service.setProperty(i, ss[i]);            ctx.rebind(props.getProperty("JndiServiceName"), service);        }    }

    public void close() throws NamingException {        ctx.close();    }

    public Context getContext() {        return ctx;    }}

注册是从属性文件中读取注册信息：

##和JndiContainer.java文件位于同一目录JndiServiceName=JndiServiceJndiServiceClass=loci.jndi.JndiServiceJndiServiceProperty="test"

测试使用JNDI：

 1 package loci.jndi; 2  3 import javax.naming.Context; 4  5 /** 6  * @author yaohw 7  * 8  */ 9 public class JndiClient {10 11     12     public static void main(String[] args){13            try{14             JndiContainer container=new JndiContainer();15             container.init();16            17               //JNDI客户端使用标准JNDI接口访问命名服务。18               Context ctx=container.getContext();19               JndiIService jndiIService=(JndiIService)ctx.lookup("JndiService");20               System.out.println("service field is:"+jndiIService.getField());21               jndiIService.fun();22               container.close();23            }24            catch(Exception e){25             e.printStackTrace();26            }27         }28 }

package com;

import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.PrintWriter;import java.util.Random;

import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;

import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageDecoder;import com.sun.image.codec.jpeg.JPEGImageEncoder;import com.sun.jndi.url.corbaname.corbanameURLContextFactory;

public class servletFirst extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public static final char[] CHARS = { '1', '2', '3', '4', '5', '6', '7',            '8', '9', '0', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',            'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',            'X', 'Y', 'Z', };    public static Random random = new Random();

    public static String getRandomString() {        StringBuffer buffer = new StringBuffer();        for (int i = 0; i < 9; i++) {            buffer.append(CHARS[random.nextInt(CHARS.length)]);        }        return buffer.toString();    }

    public static Color getRandomColor() {        return new Color(random.nextInt(255), random.nextInt(255), random                .nextInt(255));    }

    public static Color getReverseColor(Color c) {        return new Color(255 - c.getRed(), 255 - c.getGreen(), 255 - c                .getBlue());    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("image/jpeg");        String radomString = getRandomString();        request.getSession(true).setAttribute("radomString", radomString);        Color color = getRandomColor();        Color reverse = getReverseColor(color);        BufferedImage bi = new BufferedImage(100, 30, BufferedImage.TYPE_INT_RGB);        Graphics2D g = bi.createGraphics();        g.setFont(new Font(Font.SANS_SERIF,Font.BOLD,16));        g.setColor(color);        g.fillRect(0,0,100,30);        g.setColor(reverse);        g.drawString(radomString,18,20);        for (int i = 0,n = random.nextInt(100); i<n; i++) {            g.drawRect(random.nextInt(100), random.nextInt(30), 1, 1);        }        ServletOutputStream out = response.getOutputStream();        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);        encoder.encode(bi);        out.flush();    }}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->    <script>        function reloadImage(){            document.getElementById("btn").disabled=true;            document.getElementById("imgservlet").src='servlet/servletFirst?ts='+new Date().getTime();        }    </script>  </head>

  <body>    <img src="servlet/servletFirst" id="imgservlet" onload="btn.disabled=false;" onclick="onclick="reloadImage()""/>    <input type="button" value="换张图片" onclick="reloadImage()" id="btn">  </body></html>