StringUtil.java
package com.lh.bean;public class StringUtil {// 需要截取的字串private String str;public String getStr() {// 如果字串的長度大於50，則從0開始截取到50，之後的億省略符號來代替if (str.length() > 50) {return str.substring(0, 50) + "……";}return str;}public void setStr(String str) {this.str = str;}}
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><html><head><title>My JSP 'index.jsp' starting page</title></head><body><form action="substr.jsp" method="post"><table><tr><td align="center">請輸入留言內容：</td></tr><tr><td><textarea rows="5" cols="30" name="str"></textarea></td></tr><tr><td align="center"><input type="submit" value="提交" /></td></tr></table></form></body></html>
substr.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><html><head><title>My JSP 'substr.jsp' starting page</title></head><body><%request.setCharacterEncoding("UTF-8");String str = request.getParameter("str");%><jsp:useBean id="strBean" class="com.lh.bean.StringUtil"></jsp:useBean><jsp:setProperty property="str" name="strBean" value="<%=str %>" /><table width="200"><tr><td width="60" valign="top">留言內容：</td><td align="left"><jsp:getProperty property="str" name="strBean" /></td></tr></table></body></html>
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