小程序以前從未被使用過，更不用說在JSP頁面中了，這次錯新技術頻道小編教你學習jsp頁面調用applet實現人民幣的大小寫轉換的方法，希望對你學習有幫助！
實現方法一
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applet實現頁面是rmb.jsp，此頁面是通過applet來實現人民幣小寫轉換成大寫的。此頁面有三個變量需要在載入classes的時候進行初始化：
<applet? type="applet" id="myApplet" codebase = "." name="TestApplet"
?align="middle" code="lqh.rmb.Applicate.Rmb.class"
width="560" height="25">
<param name="RGB_Back" value="241|247|251">
<param name="RGB_Fore" value="255|0|0"/>
<param name="WIGTH" value="560"/>
</applet>
變量RGB_Back是初始化背景色的，修改次變量可以使applet的背景色跟自己頁面的風格一樣；變量RGB_Fore是初始化字體的顏色; WIGTH要和applet的寬度一樣，這個變量是保證顯示的轉換信息在中間顯示。
此種方法不能傳遞值給頁面trans.jsp，只能顯示并且不能copy。
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頁面代碼如下：
<html>
<head>人民幣小寫轉換成大寫</head>
<%@ page contenttype="text/html;charset=gb2312" %>
<SCRIPT language=JavaScript>
function trans(){
?? //取變量的值
?? var aaa=document.rmb. rmb_test.value;
?? //給applet賦變量的值
? ?document.myApplet.setRMB(aaa);
?? document.myApplet.repaint();
?? return true;
}
</SCRIPT>
<body>
<form name="rmb">
?輸入金額：<input type=”text” name=”rmb_test” ?onkeyup=”trans()”><br><hr>
?<%@ include file="../rmb.jsp" %>
</form>
</body>
</html>
??? ??
實現方法二
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applet實現頁面是rmb.jsp，此頁面是通過applet來實現人民幣小寫轉換成大寫的。此頁面不需要變量進行初始化，在頁面上不顯示applet畫的圖像;而可以把轉換的值傳遞給頁面變量：
<applet? type="applet" id="myApplet" codebase = "." name="TestApplet"
???? align="middle" code="lqh.rmb.Applicate.Rmb.class"
width="0" height="0">
</applet>
?
頁面trans.jsp代碼如下：
<html>
<head>人民幣小寫轉換成大寫</head>
<%@ page contenttype="text/html;charset=gb2312" %>
<%@ include file="../rmb.jsp" %>
<SCRIPT language=JavaScript>
function trans(){??
?? var aaa=document.rmb. rmb_test.value;
?? //得到轉換的值
? ?var rmb = document.myApplet.getRMB(aaa);
? ?document.rmb. rmb_result.value = rmb;
?? return true;
}
</SCRIPT>
<body>
<form name="rmb">
??輸入金額：<input type=”text” name=”rmb_test” ?onkeyup=”trans()”><br>
轉換結果：<input type=”text” name=”rmb_result” ><br>
</form>
</body>
</html>
附錄
1．applet代碼：
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package lqh.rmb.Applicate;
?
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import lqh.rmb.*;
?
public class Rmb extends Applet {
? private boolean isStandalone = false;
? private RMBConversion rmb=new RMBConversion();
? private? String var0 = "";
? private? String re_rmb="";
? private? String wigth ="0";
? private String back_color;
? private String fore_color;
?
? public String getParameter(String key, String def) {
?? return isStandalone ? System.getProperty(key, def) :
???? (getParameter(key) != null ? getParameter(key) : def);
? }
? public void paint(Graphics g) {
??? if(wigth.equals("0")){
????? wigth = "560";
??? }
??? int i= Integer.parseInt(wigth);
?
??? if(checkNum(var0)){
????? if(var0.endsWith(".")){
?????? var0 = var0.substring(0,var0.length()-1);
????? }
????? re_rmb= rmb.RMB(var0);
??? }else{
????? re_rmb="輸入錯誤："+var0;
??? }
??? int middel =(i - re_rmb.length()*12)/2;
??? this.setBackground(new Color(getColor(back_color)[0], getColor(back_color)[1], getColor(back_color)[2]));
??? this.setForeground(new Color(getColor(fore_color)[0], getColor(fore_color)[1], getColor(fore_color)[2]));
??? g.drawString(re_rmb,middel,20);
? }
? public void init() {
??? try {
????? back_color = this.getParameter("RGB_Back", "241|247|251");
?????? }catch(Exception e) {e.printStackTrace();}
?? try {
???? fore_color = this.getParameter("RGB_Fore", "255|0|0");
???? }catch(Exception e) {e.printStackTrace();}
?? try {
???? wigth = this.getParameter("WIGTH", "0");
???? }catch(Exception e) {e.printStackTrace();}
?? try {
???? jbInit();
?? }catch(Exception e) { e.printStackTrace(); }
?}
? private void jbInit() throws Exception {
?? this.setBackground(new Color(getColor(back_color)[0], getColor(back_color)[1], getColor(back_color)[2]));
? }
? public void setRMB(String rmb_temp){
??? var0 = rmb_temp;
? }
? public String getRMB(String rmb_temp){
??? if(checkNum(rmb_temp)){
????? if(rmb_temp.endsWith(".")){
?????? rmb_temp = rmb_temp.substring(0,rmb_temp.length()-1);
????? }
????? re_rmb= rmb.RMB(rmb_temp);
??? }else{
????? re_rmb="輸入錯誤："+rmb_temp;
??? }
??? return re_rmb;
? }
? public boolean checkNum(String str){
??? String numChar="0123456789.";
??? boolean breakBoolean = false;
??? for(int i=0;i<str.length();i++){
????? if(numChar.indexOf(str.substring(i,i+1))<0){
??????? breakBoolean =true;
????? }
????? if(breakBoolean) break;
??? }
??? if(breakBoolean){
????? return false;
??? }else{
????? if(str.startsWith(".")){
??????? return false;
????? }else{
??????? return true;
????? }
??? }
? }
? public String[][] getParameterInfo() {
??? String[][] pinfo =
????? {
????? {"RGB_Back", "String", ""},
????? {"RGB_Fore", "String", ""},
????? {"WIGTH",??? "String", ""},
????? };
??? return pinfo;
? }
? private int[] getColor(String rgb){
?? int[] rgb_return = new int[3];
?? int index =0,nextIndex=0,len=0;
?? while((index =rgb.indexOf("|",nextIndex))>-1){
??? rgb_return[len]=getInt(rgb.substring(nextIndex,index));
??? nextIndex=index+1;
??? len++;
?? }
?? rgb_return[len]=getInt(rgb.substring(nextIndex));
?? return rgb_return;
? }
? private int getInt(String str){
??? try{
????? return Integer.parseInt(str);
??? }catch(Exception e){
????? return 0;
??? }
? }
}
上文是jsp頁面調用applet實現人民幣的大小寫轉換內容，有沒有給你一定啟發呢?總之，大家多多學習這些知識，有助于提高您的工作效率。
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