本文中主要是java bean的簡單介紹。主要包含：
1.java bean的生命週期
2.java bean常用jsp標籤
3.簡單的java bean demo
1.java bean的生命週期
2.java bean常用的標籤及demo
HelloWorldBean.java
package beans;<br />/**<br /> * @author jefferyxu<br /> *<br /> */<br />public class HelloWorldBean {<br />private String str = "Hello World.";<br />/**<br /> * @return the str<br /> */<br />public String getStr() {<br />return str;<br />}<br />/**<br /> * @param str the str to set<br /> */<br />public void setStr(String str) {<br />this.str = str;<br />}<br />}<br />
jsp頁面：
<body><br /> <!-- 聲明使用這個bean --><br /> <jsp:useBean id="hello" class="beans.HelloWorldBean"><br /> </jsp:useBean></p><p> <!-- 設定改bean的屬性 --><br /> <jsp:setProperty name="hello" property="str" value="set hello world" /></p><p> <!-- 得到對應的屬性 --><br /><jsp:getProperty name="hello" property="str" /><br /> </body>
需要注意的是：如果<jsp:setProperty name="hello" property="str" value="set hello world"></jsp:setProperty>這麼寫的話，可能報錯：
org.apache.jasper.JasperException: /index.jsp(26,4) According to TLD, tag jsp:setProperty must be empty, but is not<br />
改成下面即可：
<!-- 設定改bean的屬性 --><br /> <jsp:setProperty name="hello" property="str" value="set hello world" />
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