Question

我正在尝试使用JSP（JSTL）将俄语字符写入MySQL 5.5。虽然它可以在我自己的localhost上运行，但我无法让它在我租用的服务器上运行。

它正在从表单向另一页发送正确的参数，然后正确显示输出。这也适用于服务器。在DB上写入/读取只能在我自己的本地主机上工作。

如果我尝试在服务器上写入DB，俄语字符会变成问号。但是，我可以使用phpMyAdmin存储俄语字符，然后在我的网页上正确显示。

这是我的查询以及到目前为止我尝试过的内容：查询：

    <sql:update dataSource="${ds}" var="updatedTable">
        INSERT INTO Question (question) VALUES (?) 
        <sql:param value="${param.questionAsked}" />
    </sql:update>

DBconn：

    <sql:setDataSource var="ds" driver="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost/myDBname?useUnicode=true&characterEncoding=utf-8" user="secret" password="secret" />

每个JSP文件中的页面编码：

    <%@page language="java" pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

将其添加到tomcat server.xml：

    <Connector port="8080" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true"
URIEncoding="UTF-8"
/>

取消注释web.xml中的CharacterEncodingFilter：

    <filter>
    <filter-name>setCharacterEncodingFilter</filter-name>
    <filter-class>org.apache.catalina.filters.SetCharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
    <async-supported>true</async-supported>
</filter>
    <filter-mapping>
    <filter-name>setCharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

使用utf8更改/创建新的DB和DB表以进行测试：

CREATE TABLE `Question` (
  `questionID` int(6) unsigned NOT NULL AUTO_INCREMENT,
  `question` varchar(255) DEFAULT NULL,
  `categoryID` int(6) unsigned DEFAULT NULL,
  PRIMARY KEY (`questionID`),
  KEY `categoryID` (`categoryID`),
  CONSTRAINT `question_ibfk_1` FOREIGN KEY (`categoryID`) REFERENCES `Category` (`categoryID`)
) ENGINE=InnoDB AUTO_INCREMENT=27 DEFAULT CHARSET=utf8;

我想我的问题出在MySQL连接器的某个地方。我无法弄清楚如何更改它，因为我无法访问mysql的配置文件。我请求SSH访问，如果这有助于我。我对这些问题相当新，因为我没有长时间处理数据库，特别是服务器。

phpMyAdmin显示：

character set client - latin1, (session value - utf8)
character set connection - latin1, (session value - utf8)
character set database - latin1
character set results - latin1, (session value - utf8)
character set server - latin1
character set system - utf8
collation connection - latin1_swedish_ci (session value - utf8_unicode_ci)
collation database - latin1_swedish_ci
collation server - latin1_swedish_ci

我希望你能建议做什么......

Answer 1

我自己想通了。只是取消注释CharacterEncoding过滤器是不够的。我也必须在我的webapp中实现一个过滤器。下面是代码：

package filters;

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);
}

public void destroy() {
}

}

不要忘记它在web.xml中：

   <filter>
   <filter-name>CharsetFilter</filter-name>
   <filter-class>filters.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>

（JSP）将UTF8写入MySQL将无法正常工作

1 个答案: