填写JSP表单 [英] Populate JSP Form
问题描述
第一次调用JSP时如何填充表单?页面刷新后，我需要处理XML文件.填充JSP页面中的表单?(不使用框架)
How to populate a form when JSP is called first time ? I need to process an XML file when a page is refreshed & populate the form in the JSP page?(not using frameworks)
推荐答案
您有2个选项:
-
使用
<jsp:usebean>，让Bean填充到构造函数中.
Use
<jsp:usebean>, let the bean fill itself in the constructor.
<jsp:useBean id="bean" class="com.example.Bean" />
...
<input name="foo" value="${fn:escapeXml(bean.foo)}">
<input name="bar" value="${fn:escapeXml(bean.bar)}">
fn:escapeXml()对于该功能不是必需的，但是如果要在HTML页面中重新显示用户控制的输入，则必须防止XSS攻击.
The fn:escapeXml() is not mandatory for the functioning, but it's mandatory to prevent XSS attacks if you're redisplaying user-controlled input in a HTML page.
使用Servlet的doGet()方法.
Use the doGet() method of a Servlet.
Bean bean = new Bean();
request.setAttribute("bean", bean);
request.getRequestDispatcher("page.jsp").forward(request, response);
，并使用URL到浏览器地址栏中的servlet，而不是JSP的URL.您可以在JSP页面中使用与上述相同的代码，但需jsp:useBean行.
and use the URL to servlet in browser address bar instead of the JSP's one. You can use the same code in JSP page as above, expect of the jsp:useBean line.
方法1更像是老派和学生的方式.方式2更加面向MVC，在这种特殊情况下更可取，因为您似乎要做的不仅仅是填充bean.
Way 1 is more the oldschool and student's way. Way 2 is more MVC oriented and preferred in this particular case since you seem to be doing more than just populating a bean.
- JSP标签信息页面-在底部包含有用的教程链接
- JSP tag info page - contains useful tutorial links at bottom
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