this.encoding = null;
this.filterConfig = null;
}
/**
* Select and set (if specified) the character encoding to be used to
* interpret request parameters for this request.
*
* @param request The servlet request we are processing
* @param result The servlet response we are creating
* @param chain The filter chain we are processing
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet error occurs
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
// Conditionally select and set the character encoding to be used
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null)
request.setCharacterEncoding(encoding);
}
// Pass control on to the next filter
chain.doFilter(request, response);
}
/**
* Place this filter into service.
*
* @param filterConfig The filter configuration object
*/
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
String value = filterConfig.getInitParameter("ignore");
if (value == null)
this.ignore = true;
else if (value.equalsIgnoreCase("true"))
this.ignore = true;
else if (value.equalsIgnoreCase("yes"))
this.ignore = true;
else
this.ignore = false;
}
// ------------------------------------------------------ Protected Methods
/**
* Select an appropriate character encoding to be used, based on the
* characteristics of the current request and/or filter initialization
* parameters. If no character encoding should be set, return
* <code>null</code>.
* <p>
* The default implementation unconditionally returns the value configured
* by the <strong>encoding</strong> initialization parameter for this
* filter.
*
* @param request The servlet request we are processing
*/
protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}
编绎后把class文件放在classes目录下，并在Web应用的web.xml文件中添加如下代码：
<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>com.neusoft.equipment.controller.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>gbk</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Set Character Encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>只要是gb2312,gbk,utf8等支持多字节编码的字符集都可以储存汉字，当然，gb2312中的汉字数量远少于gbk，而gb2312,gbk等都可在utf8下编码，这里指定目标编码方式是gbk，重新启动Tomcat后就可以了。
（2）对Get方法提交的表单，由于参数是紧跟在用户的URL请求后面，Tomcat对其的处理方法与Post方法不一样。所以上面设置的过滤器对Get方法没有作用，它需要在其他地方设置。找到Tomca的server.xml配置文件，找到对80（或者是8080等别的，这个是自己修改后的）的Connector组件的设置部分，给这个Connector组件添加一个属性：URIEncoding＝"GBK"。修改后的Connector组件是这样的：
