Date: 12/13
/======================================================/
<jsp:useBean>
與 import 功能相同
<jsp:useBean id=”產生的實體物件” scope="儲存範圍" class=”套件.class name” />
※ scope => 表示這個物件的儲存範圍，一共有四個屬性: page, request, session, application
/======================================================/
<jsp: setProerty>
可以透過 * 的形式完成屬性的自動設定
一其有4種方法
自動比對: <jsp: setProperty name=”實體的名稱(id)” property=”*” />
指定屬性: <jsp: setProperty name=”實體的名稱(id)” property=”屬性明稱” />
指定參數: <jsp: setProperty name=”實體的名稱(id)” property=”屬性明稱” param=”參數名稱” />
指定內容: <jsp: setProperty name=”實體的名稱(id)” property=”屬性明稱” value=”內容” />
/======================================================/
練習JavaBean --> demo_01.jsp、demo_02.jsp、SimpleBean.java
//demo_01.jsp
<%@ page language="java" import="java.util.*" pageEncoding="BIG5"%>
<%@ page import="com.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
SimpleBean simple=new SimpleBean();
simple.setName("聯成電腦");
simple.setAge(30);
%>
<h3>姓名:<%=simple.getName()%></h3>
<h3>年齡:<%=simple.getAge()%></h3>
</body>
</html>
//demo_02.jsp
<%@ page language="java" import="java.util.*" pageEncoding="BIG5"%>
<jsp:useBean id="simple" scope="page" class="com.SimpleBean"></jsp:useBean>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
simple.setName("Aaron");
simple.setAge(25);
%>
<h3>姓名:<%=simple.getName()%></h3>
<h3>年齡:<%=simple.getAge()%></h3>
</body>
</html>
//SimpleBean.java
package com;
public class SimpleBean {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
/======================================================/接著練習透過JavaBean來驗證所輸入的資料是否符合所設定的範圍值:
index.jsp --> 首頁輸入介面
Register.java --> JavaBean(條件)
check.jsp --> 審核是否符合，不符合就是顯示回首頁，符合就是顯示成功頁面
success.jsp --> 顯示所輸入的正確資料頁面
//index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="BIG5"%>
<jsp:useBean id="reg" scope="request" class="com.Register" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<form action="check.jsp" method="post">
<center>
使用者名稱:<input type="text" name="name" value="<jsp:getProperty name="reg" property="name"/>"/><%=reg.getErrorMsg("errname")%><br>
年齡:<input type="text" name="age" value="<jsp:getProperty name="reg" property="age"/>"/><%=reg.getErrorMsg("errage")%><br>
E-mail:<input type="text" name="email" value="<jsp:getProperty name="reg" property="email"/>"/><%=reg.getErrorMsg("erremail")%><br>
<input type="submit" value="註冊">
<input type="reset" value="重設">
</center>
</form>
</body>
</html>
//Register.java
package com;
import java.util.HashMap;
import java.util.Map;
public class Register {
private String name;
private String age;
private String email;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
private Map errors=null;
public Register(){
this.name="";
this.age="";
this.email="";
this.errors=new HashMap();
}
public String getErrorMsg(String key){
String value=this.errors.get(key);
return (value==null) ? "" : value;
}
public boolean isValidate(){
boolean flage=true;
if(!this.name.matches("\\w{6,15}")){
flage=false;
this.name=""; //清空原本的內容
this.errors.put("errname", "請重新輸入6~15字名稱");
}
if(!this.age.matches("\\d+")){
flage=false;
this.age="";
this.errors.put("errage", "請重新輸入正確數字年齡");
}
if(!this.email.matches("\\w+@\\w+\\.\\w+\\.?\\w*")){
flage=false;
this.email="";
this.errors.put("erremail", "請重新輸入正確E-Mail");
}
return flage;
}
}
//check.jsp
<%@ page language="java" import="java.util.*" pageEncoding="BIG5"%>
<jsp:useBean id="reg" scope="request" class="com.Register" />
<jsp:setProperty name="reg" property="*" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'check.jsp' starting page</title>
</head>
<body>
<%
if(reg.isValidate()){ //對所輸入的內容進行檢查
%>
<jsp:forward page="success.jsp"/>
<%
}else{
%>
<jsp:forward page="index.jsp"/>
<%
}
%>
</body>
</html>
//success.jsp
<%@ page language="java" import="java.util.*" pageEncoding="BIG5"%>
<jsp:useBean id="reg" scope="request" class="com.Register" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'success.jsp' starting page</title>
</head>
<body>
<center>
使用者名稱:<jsp:getProperty name="reg" property="name" /><br>
年齡:<jsp:getProperty name="reg" property="age" /><br>
E-mail:<jsp:getProperty name="reg" property="email" />
</center>
</body>
</html>
/======================================================/練習
//input.jsp
<%@ page language="java" import="java.util.*" pageEncoding="BIG5"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'input.jsp' starting page</title>
</head>
<body>
姓名:<input type="text" name="name" >
年齡:<input type="text" name="age" ><br>
<input type="submit" value="傳送">
<input type="reset" value="重置">
</body>
</html>
//input_bean.jsp
<%@ page language="java" import="java.util.*" pageEncoding="BIG5"%>
<jsp:useBean id="simple" scope="page" class="com.SimpleBean" />
<jsp:setProperty name="simple" property="name" param="name" />
<jsp:setProperty name="simple" property="age" param="age" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'input_bean.jsp' starting page</title>
</head>
<body>
<center>
<%
simple.setName("aaa");
simple.setAge(12);
%>
<h3>姓名:<%=simple.getName()%></h3>
<h3>年齡:<%=simple.getAge()%></h3>
</center>
</body>
</html>
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