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JSP與JavaBean

JSP動態網頁設計之JSP與JavaBean。編程環境：Java 5.0.8+eclipse 3.2 + MyEclipse 5.0 + Tomcat 5.5.17

好，學完理論，下面編寫代碼：

打開eclipse，新建一個MyEclipse下面J2EE類的web項目，如圖：

項目名為：JspJiLinCh06，今天所有代碼的樹型圖如下：

新建一個com.coderdream.bean 包，然后新建一個SampleBean1類，代碼如下：

?1?package?com.coderdream.bean;
?2?
?3?public?class?SampleBean1?{
?4?????
?5?????private?String?str;
?6?
?7?????public?SampleBean1()?{
?8?????????//?TODO?自動生成構造函數存根
?9?????}
10?????
11?????public?String?getStr()?{
12?????????return?str;
13?????}
14?
15?????public?void?setStr(String?str)?{
16?????????this.str?=?str;
17?????}
18?????
19?}

然后再新建一個sample1.jsp頁面，代碼如下：

<%@?page?language="java"?contentType="text/html;?charset=GB2312"%>
?2

<jsp:useBean?id="smBean"?class="com.coderdream.bean.SampleBean1"></jsp:useBean>
?3

<html>
?4

????<head>
?5

????????<title>一個簡單的JavaBean程序</title>
?6

????</head>
?7

????<body>
?8

????????<center>
?9

????????????<%
10

????????????????smBean.setStr("這是我的第一個JavaBean程序！");
11

????????????%>
12

????????????<%=smBean.getStr()%>
13

????????</center>
14

????</body>
15

</html>

??????? 將項目發布后，打開Tomcat 服務器，輸入網址，結果為：

下面來看看如何使用的兩個標記：分別建立SampleBean2類和兩個頁面文件sample2.html和sample2.jsp，代碼如下：

SampleBean2.java

?1?package?com.coderdream.bean;
?2?
?3?public?class?SampleBean2?{
?4?????
?5?????private?String?id;
?6?????private?String?age;
?7?????
?8?????public?SampleBean2()?{
?9?????????//?TODO?自動生成構造函數存根
10?????}
11?
12?????public?String?getAge()?{
13?????????return?age;
14?????}
15?
16?????public?void?setAge(String?age)?{
17?????????this.age?=?age;
18?????}
19?
20?????public?String?getId()?{
21?????????return?id;
22?????}
23?
24?????public?void?setId(String?id)?{
25?????????this.id?=?id;
26?????}
27?
28?}

sample2.html

<html>
?2

??<head>
?3

????<title>使用<jsp:Property&gt和<jsp:setProperty&gt標記</title>
?4

???<meta?http-equiv="content-type"?content="text/html;?charset=GB2312">
?5

??</head>
?6

??<body>
?8

????<form?name="form1"?action="sample2.jsp"?method="post">
?9

??????<table?align="center"?border="0">
10

????????<tr>
11

??????????<td>編號:</td>
12

??????????<td><input?type="text"?name="id"?></td>
13

????????</tr>
14

????????<tr>
15

??????????<td>年齡:</td>
16

??????????<td><input?type="text"?name="age"></td>
17

????????</tr>?
18

????????<tr>
19

??????????<td><input?type="submit"?value="提交"></td>
20

??????????<td><input?type="reset"?value="重填"></td>
21

????????</tr>
22

??????</table>
23

????</form>
24

??</body>
25

</html>
26

sample2.jsp

<%@?page?language="java"?contentType="text/html;?charset=GB2312"%>
<jsp:useBean?id="splBean"?class="com.coderdream.bean.SampleBean2"></jsp:useBean>
<html>
????<head>
????????<title>My?JSP?'sample1.jsp'?starting?page</title>
????</head>
????<body>
????????
????????
????????
????????
????????
????????
????????
????????
????????<jsp:setProperty?name="splBean"?property="id"?value="${param.id}"/>
????????<jsp:setProperty?name="splBean"?property="age"?value="${param.age}"/>
????????
????????
????????
????????
????????<center>
????????????編號：<jsp:getProperty?name="splBean"?property="id"/>
????????????年齡：<jsp:getProperty?name="splBean"?property="age"/>
????????</center>
????</body>
</html>

通過jsp代碼可知，可用4種方式設置標記：

???????? <jsp:setProperty?name="splBean"?property="*"/>

????????<jsp:setProperty?name="splBean"?property="id"/>
????????<jsp:setProperty?name="splBean"?property="age"/>

????????<jsp:setProperty?name="splBean"?property="id"?param="id"/>
????????<jsp:setProperty?name="splBean"?property="age"?param="age"/>

????????<jsp:setProperty?name="splBean"?property="id"?value="${param.id}"/>

????????<jsp:setProperty?name="splBean"?property="age"?value="${param.age}"/>

運行結果為：
?????????①輸入編號和姓名：

??????② 返回結果：

先建立一個JavaBean，JavaBean5.java

?1?package?com.coderdream.bean;
?2?
?3?public?class?SampleBean4?{
?4?
?5?????private?String?sumIncome?=?"";
?6?
?7?????private?String?taxStart?=?"";
?8?
?9?????private?double?tax?=?0;
10?
11?????public?SampleBean4()?{
12?????????//?TODO?自動生成構造函數存根
13?????}
14?
15?????public?String?getSumIncome()?{
16?????????return?sumIncome;
17?????}
18?
19?????public?void?setSumIncome(String?sumIncome)?{
20?????????this.sumIncome?=?sumIncome;
21?????}
22?
23?????public?double?getTax()?{
24?????????return?tax;
25?????}
26?
27?????public?void?setTax(double?tax)?{
28?????????this.tax?=?tax;
29?????}
30?
31?????public?String?getTaxStart()?{
32?????????return?taxStart;
33?????}
34?
35?????public?void?setTaxStart(String?taxStart)?{
36?????????this.taxStart?=?taxStart;
37?????}
38?
39?????public?void?calculate()?{
40?????????double?totalMoney?=?Double.parseDouble(sumIncome);
41?????????double?baseMoney?=?Double.parseDouble(taxStart);
42?????????double?balance?=?totalMoney?-?baseMoney;
43?
44?????????System.out.println(totalMoney);
45?????????System.out.println(baseMoney);
46?????????
47?????????try?{
48?????????????if?(balance?<?0)
49?????????????????tax?=?0;
50?????????????if?(balance?>?0?&&?balance?<=?500)
51?????????????????tax?=?balance?*?0.05;
52?????????????if?(balance?>?500?&&?balance?<=?2000)
53?????????????????tax?=?balance?*?0.1?-?25;
54?????????????if?(balance?>?2000?&&?balance?<=?5000)
55?????????????????tax?=?balance?*?0.15?-?125;
56?????????????if?(balance?>?5000?&&?balance?<=?20000)
57?????????????????tax?=?balance?*?0.2?-?375;
58?????????????if?(balance?>?20000?&&?balance?<=?40000)
59?????????????????tax?=?balance?*?0.25?-?1375;
60?????????????if?(balance?>?40000?&&?balance?<=?60000)
61?????????????????tax?=?balance?*?0.3?-?3375;
62?????????????if?(balance?>?60000?&&?balance?<=?80000)
63?????????????????tax?=?balance?*?0.35?-?6375;
64?????????????if?(balance?>?80000?&&?balance?<=?100000)
65?????????????????tax?=?balance?*?0.4?-?10375;
66?????????????if?(balance?>?100000)
67?????????????????tax?=?balance?*?0.45?-?15375;
68?????????}?catch?(Exception?e)?{
69?????????????System.out.println(e.toString());
70?????????}
71?????}
72?
73?}

然后建立兩個測試頁面：sample3.html和sample8.jsp

sample3.html

?1?<html>
?2?????<head>
?3?????????<title>個人所得稅計算器</title>
?4?????????<meta?http-equiv="content-type"?content="text/html;?charset=GB2312">
?5?????</head>
?6?
?7?????<body>
?8?????????<form?name="form1"?method="post"?action="sample8.jsp">
?9?????????????<table?width="358"?height="140"?border="0"?cellpadding="0"
10?????????????????cellspacing="0"?bgcolor="#E6E6E6">
11?????????????????<tr?align="center">
12?????????????????????<td?colspan="3">
13?????????????????????????<strong>個人所得稅計算器</strong>
14?????????????????????</td>
15?????????????????</tr>
16?????????????????<tr>
17?????????????????????<td?colspan="2">
18?????????????????????????當月個人總收入：
19?????????????????????</td>
20?????????????????????<td?width="177">
21?????????????????????????<input?name="sumIncome"?type="text">
22?????????????????????</td>
23?????????????????</tr>
24?????????????????<tr>
25?????????????????????<td?colspan="2">
26?????????????????????????當地個人所得稅起征額：
27?????????????????????</td>
28?????????????????????<td>
29?????????????????????????<input?name="taxStart"?type="text">
30?????????????????????</td>
31?????????????????</tr>
32?????????????????<tr?align="center">
33?????????????????????<td?width="161"?align="right">
34?????????????????????????<input?type="submit"?name="Submit"?value="確定">
35?????????????????????</td>
36?????????????????????<td?width="20"></td>
37?????????????????????<td?align="left">
38?????????????????????????<input?type="reset"?name="Reset"?value="重填">
39?????????????????????</td>
40?????????????????</tr>
41?????????????</table>
42?????????</form>
43?????</body>
44?</html>

sample8.jsp

?1?<%@?page?language="java"?contentType="text/html;?charset=GB2312"%>
?2?<jsp:useBean?id="splBean"?class="com.coderdream.bean.SampleBean4"?scope="request"></jsp:useBean>
?3?<html>
?4?????<head>
?5?????????<title>個人所得稅計算器</title>
?6?????</head>
?7?????<body>
?8?????????<%
?9?????????????String?sumIncome?=?request.getParameter("sumIncome");
10?????????????String?taxStart?=?request.getParameter("taxStart");
11?????????????????
12?????????????splBean.setSumIncome(sumIncome);
13?????????????splBean.setTaxStart(taxStart);
14?
15?????????????splBean.calculate();
16?????????%>
17?????????<center>
18?????????????<p>
19?????????????????當月應繳個人所得稅為:
20?????????????????<strong>
21?????????????????????<%
22?????????????????????????out.println(splBean.getTax());
23?????????????????????%>
24?????????????????</strong>
25?????????????</p>
26?????????</center>
27?????</body>
28?</html>

輸出結果為：

最后，我們設計一個計算器，先建立一個JavaBean，然后新建一個測試頁面：
JavaBean5.java

?1?package?com.coderdream.bean;
?2?
?3?public?class?SampleBean5?{
?4?
?5?????private?String?first;
?6?????private?String?second;
?7?????private?double?result;
?8?????private?String?operator;
?9?????
10?????public?SampleBean5()?{
11?????????//?TODO?自動生成構造函數存根
12?????}
13?
14?????public?String?getFirst()?{
15?????????return?first;
16?????}
17?
18?????public?void?setFirst(String?first)?{
19?????????this.first?=?first;
20?????}
21?
22?????public?String?getOperator()?{
23?????????return?operator;
24?????}
25?
26?????public?void?setOperator(String?operator)?{
27?????????this.operator?=?operator;
28?????}
29?
30?????public?double?getResult()?{
31?????????return?result;
32?????}
33?
34?????public?void?setResult(double?result)?{
35?????????this.result?=?result;
36?????}
37?
38?????public?String?getSecond()?{
39?????????return?second;
40?????}
41?
42?????public?void?setSecond(String?second)?{
43?????????this.second?=?second;
44?????}
45?????
46?????/*
47??????*?根據不同操作符進行計算
48??????*/
49?????public?void?calculate()?{
50?????????
51?????????try?{
52?????????????double?one?=?Double.parseDouble(first);
53?????????????double?two?=?Double.parseDouble(second);
54?????????????
55?????????????if?(operator.equals("+"))?{
56?????????????????result?=?one?+?two;
57?????????????}?else?if?(operator.equals("-"))?{
58?????????????????result?=?one?-?two;
59?????????????}?else?if?(operator.equals("*"))?{
60?????????????????result?=?one?*?two;
61?????????????}?else?if?(operator.equals("/"))?{
62?????????????????result?=?one?/?two;
63?????????????}
64?????????}?catch?(NumberFormatException?e)?{
65?????????????//?TODO?自動生成?catch?塊
66?????????????e.printStackTrace();
67?????????}?
68?????????
69?????????
70?????}
71?????
72?}

sample9.jsp

?1?<%@?page?language="java"?contentType="text/html;?charset=GB2312"%>
?2?<jsp:useBean?id="calculator"?scope="request"?class="com.coderdream.bean.SampleBean5"?>
?3?????<jsp:setProperty?name="calculator"?property="*"/>
?4?</jsp:useBean>
?5?<html>
?6???<head>
?7?????<title>簡單計數器</title>
?8?????<meta?http-equiv="content-type"?content="text/html;?charset=GB2312">
?9???</head>
10???<body>
11???????<p?align="center">
12???????????<b>簡單的計算器</b>
13???????????<hr>
14???????????計算結果：
15???????????<%
16???????????????try?{
17???????????????????calculator.calculate();
18???????????????????out.println(calculator.getFirst()?
19???????????????????????????????????????????+?calculator.getOperator()?
20???????????????????????????????????????????+?calculator.getSecond()
21???????????????????????????????????????????+?"?=?"?+
22???????????????????????????????????????????+?calculator.getResult());
23???????????????}?catch?(Exception?e)?{
24???????????????????System.out.println(e);
25???????????????}
26?
27???????????%>
28???????
29???????</p>
30???????<hr>
31???????<form?action="sample9.jsp"?method="get">
32???????????<table>
33???????????????<tr>
34???????????????????<td?align="right">第一個參數</td>
35???????????????????<td><input?type="text"?name="first"></td>
36???????????????</tr>
37???????????????<tr>
38???????????????????<td?align="right">操作符</td>
39???????????????????<td>
40???????????????????
41???????????????????????<select?name="operator">
42???????????????????????????<option?value="+">+</option>
43???????????????????????????<option?value="-">-</option>
44???????????????????????????<option?value="*">*</option>
45???????????????????????????<option?value="/">/</option>
46???????????????????????</select>
47???????????????????</td>
48???????????????</tr>
49???????????????<tr>
50???????????????????<td?align="right">第二個參數</td>
51???????????????????<td><input?type="text"?name="second"></td>
52???????????????</tr>
53?????????????<tr>
54???????????????????<td?align="center"?colspan="2">
55???????????????????????<input?type="submit"?value="計算">
56???????????????????</td>
57???????????????</tr>
58???????????</table>
59???????</form>
60???</body>
61?</html>

運行結果：

《全文完》

posted on 2006-09-03 23:54 CoderDream 閱讀(2037) 評論(4) 編輯收藏所屬分類: JSP

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