作为字符串检索的 JSP 标签不被执行
我有 Java 类，它负责渲染一些 html 元素，并且我们为它们创建了一些预定义的标签。
public class StartDateField {
private static StartDateField object;
private StartDateField(){}
public static StartDateField getInstance(){
if(object == null){
object = new StartDateField();
}
return object;
}
public String render(){
String field = "<field:text name='first_name' size='65' maxlen='63' style='field' />";
return field;
}
然后
我尝试在 JSP 标记内调用该渲染方法（该标记也导入到上面的类），
<td colspan="2">
<%=StartDateField.getInstance(SUBpagebean).render()%>
</td>
但它什么也不显示。当我查看源代码时，它显示返回的文本而不是执行标记。这是如何引起的以及如何解决？
I have Java class which is responsible for rendering some html elements and we have some predefined tags created for them.
public class StartDateField {
private static StartDateField object;
private StartDateField(){}
public static StartDateField getInstance(){
if(object == null){
object = new StartDateField();
}
return object;
}
public String render(){
String field = "<field:text name='first_name' size='65' maxlen='63' style='field' />";
return field;
}
}
Then I tried to call that render method inside the JSP tag (which also has import to above class)
<td colspan="2">
<%=StartDateField.getInstance(SUBpagebean).render()%>
</td>
But it displays nothing. When I go to view source it shows the returned text instead of executing the tag. How is this caused and how can I solve it?
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<%= someExpression() %>表示：计算 Java 表达式someExpression()，并将其结果写入 HTTP 响应编写器。显然，您正在将JSP 标记必须位于要评估的 JSP 的静态源代码中。
请注意，JSTL 是标准标签库。
<%= someExpression() %>means: evaluate the Java expressionsomeExpression(), and write its result to the HTTP response writer. So obviously, you're writing<field:text name='first_name' size='65' maxlen='63' style='field' />directly to the response.A JSP tag must be in the static source code of the JSP to be evaluated.
Note that JSTL is a standard library of tags.
<field:text>is a custom JSP tag. It's not a JSTL tag.