JSP - scriptlet出了什么问题，以及使用什么 [英] JSP - What is wrong with scriptlets, and what to use instead

问题描述

我多年前在一本书中阅读了JSP，最近决定自己学习。我现在知道如何使用JSP脚本，表达式和声明。

I read about JSP in a book many years ago, and recently decided to learn on my own. I now know how to use JSP scriptlets, expressions, and declarations

    <%! String str = "Hello World" %>
    <%= str.length() %>
    <% str=str.substring(0,5) %>

但是我在很多地方（在这个网站和其他地方）读过我不应该使用scriptlets 。这是一个这样的问题： Eclipse using Classes in JSP

But I have read in many places (on this site and elsewhere) that I shouldn't use scriptlets. This is one such question: Eclipse using Classes in JSP

我的问题是：

My questions are:

1. scriptlets有什么问题？


2. 我用什么来代替？

预先感谢您的帮助！

我不使用Servlet，而是将我的JSP代码嵌入到HTML页面中。不了解Java的UI设计人员可以轻松修改我的页面。
基本上，我使用JSP作为前端，用于显示数据库并对其进行更新，例如当用户下订单时。

I do not use Servlets, but embed my JSP code onto an HTML page. UI designers with no knowledge of Java can easily modify my page. Basically I use JSP as a front end for displaying from a database and making updates to it such as when a user makes an order.

推荐答案

当然，这是我个人的看法。我说脚本是：

This is my personal opinion, of course. I say scriptlets are:

1. 1998年的复古技术需要消失;对微软ASP的失败响应。


2. 丑陋


3. 难以阅读


4. 难以维护
>

5. 阻止重用和封装


6. 鼓励在页面中添加复杂的逻辑
   

1. A 1998 vintage technology that needs to disappear; a failed response to Microsoft's ASP.
2. Ugly
3. Hard to read
4. Hard to maintain
5. Discourage reuse and encapsulation
6. Encourage putting complex logic in pages

用什么来代替？

What to use instead?

1. 世界已经走向HTML5，CSS3，JavaScript，jQuery，Bootstrap和Web技术与REST Web服务交流的方向。这是一个很好的方向。


2. 如果您必须坚持使用JSP，请从JSP标准模板库开始。保持HTML页面看起来像HTML - 它将使UI开发人员更容易维护它们。
   
3. 尝试一种更现代的模板解决方案（如Thymeleaf）以从服务器端生成HTML。 / li>
   

1. The world has gone in the direction of HTML5, CSS3, JavaScript, jQuery, Bootstrap, and web technologies talking to REST web services. It's a good direction.
2. If you must stick with JSPs, start with the JSP standard template library. Keep your HTML pages looking like HTML - it'll make it easier for UI developers to maintain them.
3. Try a more modern template solution like Thymeleaf to generate your HTML from the server side.

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