JSF编码UTF-8？

Question

现在，我正在与朋友一起工作，他是越南人，他想使用越南语创建一个网站，但是我们对UTF-8编码存在问题。我编写了一个Filter类，如下所示：

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class CharsetFilter implements Filter
{
    private String encoding;   

    public void init(FilterConfig config) throws ServletException
    {
        encoding = config.getInitParameter("requestEncoding");
        if( encoding==null ) encoding="UTF-8";
     }
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain  next)   throws IOException, ServletException
    {
        // Respect the client-specified character encoding
        // (see HTTP specification section 3.4.1)
        if(null == request.getCharacterEncoding())
            request.setCharacterEncoding(encoding);
        /** * Set the default response content type and encoding */
        response.setContentType("text/html; charset=UTF-8");
        response.setCharacterEncoding("UTF-8");
        next.doFilter(request, response);
        }

    @Override
    public void destroy() {}
}

在web.xml中的配置：

<filter>
        <filter-name>CharsetFilter</filter-name>
        <filter-class>com.mypackage.CharsetFilter</filter-class>
        <init-param>
                <param-name>requestEncoding</param-name>
                <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharsetFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

在服务器资源中-sun-resources.xml：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE resources PUBLIC "-//Sun Microsystems, Inc.//DTD Application Server 9.0 Resource Definitions //EN" "http://www.sun.com/software/appserver/dtds/sun-resources_1_3.dtd">
<resources>
  <jdbc-connection-pool allow-non-component-callers="false" associate-with-thread="false" connection-creation-retry-attempts="0" connection-creation-retry-interval-in-seconds="10" connection-leak-reclaim="false" connection-leak-timeout-in-seconds="0" connection-validation-method="auto-commit" datasource-classname="com.mysql.jdbc.jdbc2.optional.MysqlDataSource" fail-all-connections="false" idle-timeout-in-seconds="300" is-connection-validation-required="false" is-isolation-level-guaranteed="true" lazy-connection-association="false" lazy-connection-enlistment="false" match-connections="false" max-connection-usage-count="0" max-pool-size="32" max-wait-time-in-millis="60000" name="vietweb" non-transactional-connections="false" pool-resize-quantity="2" res-type="javax.sql.DataSource" statement-timeout-in-seconds="-1" steady-pool-size="8" validate-atmost-once-period-in-seconds="0" wrap-jdbc-objects="false">
        <property name="serverName" value="localhost"/>
        <property name="portNumber" value="3306"/>
        <property name="databaseName" value="vietweb"/>
        <property name="User" value="root"/>
        <property name="Password" value="12345"/>
         <property name="useUnicode" value="true"/>
        <property name="characterEncoding" value="UTF8"/>
        <property name="URL" value="jdbc:mysql://localhost:3306/vietweb"/>
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
  </jdbc-connection-pool>
  <jdbc-resource enabled="true" jndi-name="jdbc/vietweb" object-type="user" pool-name="mysql_vietweb_rootPool"/>
</resources>

在JSF页面中：

<meta http-equiv="content-type" content="text/html; charset=utf-8"/>

但是它没有被编码成越南语。我们如何使其编码为越南语？

将数据保存到数据库中的问题（我使用的数据库是MySQL）我想要/期望此输出：

chuy?n phát nhanh ?? chuy?n t?i nh?ng cu?n sách

但是我看到了这个意外的输出：

chuy?n phát nhanh ?? chuy?n t?i nh?ng ??u sách 

Answer 1

症状表明MySQL数据库和/或表已创建为ISO-8859-x而不是UTF-8。任何超出ISO-8859-x范围的字符都将存储为?。如下更新数据库和/或表：

ALTER DATABASE dbname DEFAULT CHARACTER SET utf8;
USE dbname;
ALTER TABLE tblname CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;

webapp和数据库连接设置非常好。否则，您会看到mojibake而不是问号。

也就是说，从CharsetFilter本质上讲是不必要的。默认情况下，Facelets上的JSF已经使用UTF-8。当您仍在使用旧版JSP而不是Facelets时，您需要做的就是在JSP顶部添加以下行：

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

并且仅request.setCharacterEncoding()在过滤器中执行（对则不执行任何操作response）。

也可以看看：

• Unicode-如何正确获取字符？