JSP教程(六)—— JSP实现整型加法

代码:

 1 <body>
 2     <%
 3         String a1 ="";
 4         String a2 = "";
 5         long s = 0;
 6         a1 = request.getParameter("aa");
 7         a2 = request.getParameter("bb");
 8         String outs="";
 9         if(a1!=null && !a1.trim().equals("") && a2!=null && !a2.trim().equals("")){
10             try{
11                 s = Long.parseLong(a1)+Long.parseLong(a2);
12                 outs = String.valueOf(s);
13             }catch(Exception ex){
14             outs="您输入的不是有效数字!";
15             }
16         }
17         if(a1==null||a2==null) {
18             a1 ="";
19             a2 = "";
20         }
21     %>
22  
23     <h1>整型加法计算</h1>
24     <form name="form1" action="" method="post">
25         <input type="text" name="aa" id="aa" value="<%=a1%>"/>+
26         <input type="text" name="bb" id="bb" value="<%=a2%>"/>=
27         <input type="text" name="s" id="s" value="<%=outs%>"/>
28         <br>
29         <input type="submit" name="submit1" value="计算"/>
30     </form>
31 </body>

运行结果:

posted @ 2018-02-19 15:18  祁俊辉  阅读(715)  评论(0编辑  收藏  举报