Java四大美女
时间：2010-08-16 来源：老 陈
古代有四大美人，各位热爱Java的大侠，可知Java也有四大美女？
如果被我问得一头雾水，那你就是有点out了。Java从开天辟地，进化到今天，可谓历尽苍桑，但是还是免费的。那为什么甲骨文还要花重金购买呢？原因很简单，甲骨文已经发现了Java的价值千金所在了。千金者，美女也。
Java发展至今天，也有点历史了，却很少有人为其四大美女著书立说，鄙人不才，看不过眼，就硬着头皮献美了，四大美女出场：
小可爱Applet；
后台老板Servlet；
掌门人Portlet；
小家碧玉MIDlet。
做为美女，难免骚首弄姿，所以她们的出场可能有不同的姿态，暂安排如下 ：
- 害羞的小可爱——Applet刷卡器
- 无限风情的小甜甜——Applet聊天室
- 通情达理的接线生——Applet软电话
- 后台老板——无所不能的Servlet
- 惊现掌门人——Portlet闪亮登场
- 小家碧玉——智能设备MIDlet
各位香味相投的朋友，是不是心痒痒，想尽快一睹美女的芳容了？好吧，让小可爱先给大家亮一个pose。
一、害羞的小可爱——Applet刷卡器
用IC卡在刷卡器一放，"嘟"的一响，就刷了卡了。那么刷卡的程序是怎么设计的，下面我们用一个在WEB上的刷卡器作一介绍，Applet程序：
package dcrf;
//import java.awt.*;
import java.applet.*;
import java.net.URL;
import java.net.MalformedURLException;
/**
* 读卡器
* @author Chen
* @since 2007-04-29
*/
public class ReadCard extends Applet implements Runnable{
private boolean isStandalone = false;
private String urlroot = null;
private String urlfor = null;
private Thread readCard;
private String forward = null;
public String getParameter(String key, String def) {
return isStandalone ? System.getProperty(key, def) :
(getParameter(key) != null ? getParameter(key) : def);
}
public void init() {
this.urlroot = getDocumentBase().toString().substring(0,getDocumentBase().toString().lastIndexOf("/")+1);
this.urlfor = getDocumentBase().toString().substring(getDocumentBase().toString().lastIndexOf("/"));
this.forward = getParameter("forward");
}
public void start() {
readCard = new Thread(this);
readCard.start();
}
public void stop() {
log("");
readCard = null;
}
public void run() {
Thread me = Thread.currentThread();
while (readCard == me) {
try {
ReadCardBean rc = new ReadCardBean();
CardActionForm card = new CardActionForm();
card = rc.getFromCard();
if(card.getDevice() <= 0){
log("读卡器初始化失败！");
}else if(card.getStatus() == 1){
log("请使用正确IC卡！");
}else if(card.getStatus() == 2){
log("装入密码失败！");
}else if(card.getStatus() == 3){
log("校验密码失败！");
}else if(card.getStatus() == 4){
log("读卡失败！");
}else if(card.getStatus() == 5){
log("读卡器退出失败！");
}else if(card.getStatus() == 6){
log("蜂鸣失败！");
}else{
log("");
card.setRand(java.lang.Math.random());
sendToClient(card);
}
Thread.currentThread().sleep(700);
}
catch (InterruptedException e) {
log("Run Error:"+e.toString());
}
catch (Exception et) {
log("RunOther Error:"+et.toString());
}
}
}
public void sendToClient(CardActionForm card){
try {
if(forward != null && "accept".equals(forward))
urlfor = "dealAcceptAction.do?method=acceptCard";
else if(forward != null && "flower".equals(forward))
urlfor = "dealAction.do?method=acceptCard";
else if(forward != null && "test".equals(forward))
urlfor = "readCardAction.do?method=startRead";
String prBuffer = "";
if(card.getPrBuffer() != null)
prBuffer = new String(card.getPrBuffer());
URL newurl = new URL(urlroot+urlfor+"&prBuffer="+prBuffer+"&j"+card.getRand()+"=");
getAppletContext().showDocument(newurl,"_self");
}catch(MalformedURLException g){
log("Send Error:"+g.toString());
}
}
public void log(String str){
getAppletContext().showStatus(str);
}
}
这个Applet运用了一个线程，等待刷卡操作，一旦刷卡成功，发出蜂鸣声并转到其它应用界面，否则在浏览器的状态栏中打出错误信息。Applet还调用了一个读卡程序和一个数据结构。
/**
* 读取刷卡器
* @author Chen
* @since 2007-04-28
*/
package dcrf;
class ReadCardBean
{
public void ReadCardBean(){
}
public CardActionForm getFromCard()
{
short status;
int lDevice = 0;
int[] pSnr = new int[1];
char[] pSBuffer = new char[16];
char[] pRBuffer = new char[16];
JavaRD800 rd = new JavaRD800();
CardActionForm form = new CardActionForm();
form.setStatus((short)0);
form.setDevice(1);
//初始化读卡器
lDevice = rd.dc_init(100,115200);
if(lDevice <= 0)
{
form.setDevice(lDevice);
return form;
}
//检查卡类型
status = rd.dc_card(lDevice,(short)0,pSnr);
if(status != 0)
{
form.setStatus((short)1);
rd.dc_exit(lDevice);
return form;
}
form.setPsnr(pSnr);
//发出蜂鸣声
status = rd.dc_beep(lDevice,(short)10);
if(status != 0)
{
form.setStatus((short)6);
rd.dc_exit(lDevice);
return form;
}
//装入密码
pSBuffer[0] = 0xCC;
...
pSBuffer[6] = 0x00;
status = rd.dc_load_key(lDevice,(short)0,(short)1,pSBuffer);
if(status != 0)
{
form.setStatus((short)2);
rd.dc_exit(lDevice);
return form;
}
form.setPsBuffer(pSBuffer);
//验证密码
status = rd.dc_authentication(lDevice,(short)0,(short)1);
if(status != 0)
{
form.setStatus((short)3);
rd.dc_exit(lDevice);
return form;
}
//读出编码
status = rd.dc_read(lDevice,(short)4,pRBuffer);
if(status != 0)
{
form.setStatus((short)4);
rd.dc_exit(lDevice);
return form;
}
form.setPrBuffer(pRBuffer);
//退出
status = rd.dc_exit(lDevice);
if(status != 0)
{
form.setStatus((short)5);
rd.dc_exit(lDevice);
return form;
}
return form;
}
}
/**
* 读卡数据结构
* @author Chen
* @since 2007-04-19
*/
package dcrf;
public class CardActionForm implements java.io.Serializable{
private short status;
private int device;
private int[] psnr;
private char[] psBuffer;
private char[] prBuffer;
private String owner_code;
private double rand;
public short getStatus() { return status; }
public void setStatus(short status) { this.status = status; }
public int getDevice() { return device; }
public void setDevice(int device) { this.device = device; }
public int[] getPsnr() { return psnr; }
public void setPsnr(int[] psnr) { this.psnr = psnr; }
public char[] getPsBuffer() { return psBuffer; }
public void setPsBuffer(char[] psBuffer) { this.psBuffer = psBuffer; }
public char[] getPrBuffer() { return prBuffer; }
public void setPrBuffer(char[] prBuffer) { this.prBuffer = prBuffer; }
public String getOwner_code() { return owner_code; }
public void setOwner_code(String owner_code) { this.owner_code = owner_code; }
public double getRand() { return rand; }
public void setRand(double rand) { this.rand = rand; }
}
读卡程序还调用了IC卡的Api：
/*
* @(#)JavaRD800.java 1.0 03/11/27
*
*/
package dcrf;
public class JavaRD800
{
public JavaRD800()
{
}
static
{
System.loadLibrary("javaRD800");
}
public native int dc_init(int lPort,int lBaud);
public native short dc_exit(int lDevice);
public native short dc_card(int lDevice,short iMode,int[] pSnr);
public native short dc_authentication(int lDevice,short iMode,short iSecNr);
public native short dc_halt(int lDevice);
public native short dc_read(int lDevice,short iAdr,char[] pData);
public native short dc_write(int lDevice,short iAdr,char[] pData);
public native short dc_increment(int lDevice,short iAdr,int lValue);
public native short dc_decrement(int lDevice,short iAdr,int lValue);
public native short dc_initval(int lDevice,short iAdr,int lValue);
public native short dc_readval(int lDevice,short iAdr,int[] pValue);
public native short dc_transfer(int lDevice,short iAdr);
public native short dc_restore(int lDevice,short iAdr);
public native short dc_load_key(int lDevice,short iMode,short iSecNr,char[] pKey);
public native short dc_beep(int lDevice,short iMsec);
public native short dc_high_disp(int lDevice,short iOffset,short iDispLen,char[] pDispStr);
public native short dc_request(int lDevice,short iMode,int[] pTagType);
public native short dc_anticoll(int lDevice,short iBcnt,int[] pSnr);
public native short dc_select(int lDevice,int lSnr,short[] pSize);
public native short dc_gettime(int lDevice,char[] pTimeStr);
public native short dc_gettimehex(int lDevice,char[] pTimeStr);
public native short dc_settime(int lDevice,char[] pTimeStr);
public native short dc_settimehex(int lDevice,char[] pTimeStr);
public native short dc_setbright(int lDevice,short iBright);
public native short dc_ctl_mode(int lDevice,short iMode);
public native short dc_disp_mode(int lDevice,short iMode);
public native short dc_cpureset(int lDevice,short[] pLen,char[] pData);
public native short dc_cpuapdu(int lDevice,short iLen,char[] pSData,short[] pLen,char[] pRData);
public native short dc_cpuapdusource(int lDevice,short iLen,char[] pSData,short[] pLen,char[] pRData);
public native short dc_cpudown(int lDevice);
public native short dc_swr_eeprom(int lDevice,int lOffset,int lLen,char[] pBuffer);
public native short dc_srd_eeprom(int lDevice,int lOffset,int lLen,char[] pBuffer);
public native short dc_disp_str(int lDevice,char[] pDispStr);
}
把上面程序编译打包为：card.jar，然后在页面上调用：
<script language="JavaScript" type="text/JavaScript">
<!--
function showapplet(){
objecttext ="<OBJECT classid='clsid:8AD9C840-044E-11D1-B3E9-00805F499D93' width='0' height='0' codebase='flower/java_card_driver.exe'>";
objecttext +="<PARAM name='java_code' value='dcrf.ReadCard.class'>";
objecttext +="<PARAM name='java_codebase' value='.'>";
objecttext +="<PARAM name='java_archive' value='flower/card.jar'>";
objecttext +="<PARAM name='type' value='application/x-java-applet;version=1.2'>";
objecttext +="<PARAM name='forward' value='accept'>";
objecttext +="<COMMENT>";
objecttext +="<EMBED type='application/x-java-applet;version=1.2' width='0' height='0' pluginspage='flower/java_card_driver.exe' java_code='dcrf.ReadCard.class' java_codebase='.' java_archive='flower/card.jar' forward='accept'/>";
objecttext +="<NOEMBED>";
objecttext +=" Plugin tag OBJECT or EMBED not supported by browser.";
objecttext +="</NOEMBED>";
objecttext +="</COMMENT>";
objecttext +="</OBJECT>";
myapplet.innerHTML = objecttext;
}
showapplet();
-->
</script>
从这个调用上我们可以看到，这个Applet没有显示在页面上，因为它的长和宽都设为："0"了，width='0' height='0'。
这个小可爱可不是一般的"犹抱琵琶半遮面"的害羞，简直是只闻其声，不见其影。看来今天美女芳容还是难得一见，哈哈...
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