如何使用 Struts 2 在 JSP 中编写 UTF-8 符号

Question

I have a list in my action which I field by values saved on a MySql DB.

I only have one object stored, which has designation € .

In JSP when I do this:

<s:iterator value="unitesList">
    <s:property value="designation"/>
</s:iterator>
<s:select list="unitesList" name="unity" listValue="designation" listKey="id" />

I have this:

€
<select name="unity" id="unity">
    <option value="1">?</option>
</select>

Why on <s:select> element the € element is transformed in a ? ?

Answer 1

Place this on the top of the JSP page. Symbols in UTF-8 encoding displays better than ? .

<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>

Answer 2

If the page encoding is not defined, the default is (the equivalent of the JSP page directive):

<%@page contentType="text/html; charset=ISO-8859-1" %>

The encoding you want is not ISO-8859-1 , but UTF-8 , that supports any language (take a look at Table 23-2 Valid Values for the IANA-Defined Character Set ).

You can set your page, request and response encoding in three ways:

1. Setting the contentType in each JSP:

    <%@page contentType="text/html; charset=UTF-8" %>

2. Setting the pageEncoding in each JSP:

    <%@page pageEncoding="UTF-8" %>

3. Setting the <jsp-property-group> once in web.xml:

    <jsp-config> <jsp-property-group> <url-pattern>*.jsp</url-pattern> <page-encoding>UTF-8</page-encoding> </jsp-property-group> </jsp-config>

The HTML <meta> tag will be generated accordingly. Remember to not specify different encodings when unnecessarily using both pageEncoding and <jsp-property-group> , it is a translation-time error.

For more info about this, read the Oracle docs (pretty old, but still true).