接收参数时，传递的值变成了？?¤???? ，乱码？老问题了，自己做到才想重视。
我是用BEAN写的， "jdbc:mysql://localhost:3306/yarsye?useUnicode=true&characterEncoding=GBK ", "root ", "111 "这句在BEAN里有，
现在在参数传递时就有问题了，传递语句是： <a href= "lamp_products.jsp?na= <%=na%> " </a>
接收语句是：String name=request.getParameter( "na ");
[解决办法]
最方便的方法,tomcat配置文件修改下
<Connector port= "8080 " protocol= "HTTP/1.1 "
maxThreads= "150 " connectionTimeout= "20000 "
redirectPort= "8443 "/>
后面加上这一个
URIEncoding= "gb2312 "
[解决办法]
如果请求的参数过多，使用起来代码显得臃肿。既然你用的是Tomcat，这个问题tomcat已经实现了一个转换中文的过滤器，配置起来也相当简单。
源码如下：
/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License ");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS " BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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;
import javax.servlet.UnavailableException;
/**
* <p> Example filter that sets the character encoding to be used in parsing the
* incoming request, either unconditionally or only if the client did not
* specify a character encoding. Configuration of this filter is based on
* the following initialization parameters: </p>
* <ul>
* <li> <strong> encoding </strong> - The character encoding to be configured
* for this request, either conditionally or unconditionally based on
* the <code> ignore </code> initialization parameter. This parameter
* is required, so there is no default. </li>
* <li> <strong> ignore </strong> - If set to "true ", any character encoding
* specified by the client is ignored, and the value returned by the
* <code> selectEncoding() </code> method is set. If set to "false,
* <code> selectEncoding() </code> is called <strong> only </strong> if the
* client has not already specified an encoding. By default, this
* parameter is set to "true ". </li>
* </ul>
*
* <p> Although this filter can be used unchanged, it is also easy to
* subclass it and make the <code> selectEncoding() </code> method more
* intelligent about what encoding to choose, based on characteristics of
* the incoming request (such as the values of the <code> Accept-Language </code>
* and <code> User-Agent </code> headers, or a value stashed in the current
* user 's session. </p>
*
* @author Craig McClanahan
* @version $Revision: 1.2 $ $Date: 2004/03/18 16:40:33 $
*/
public class SetCharacterEncodingFilter implements Filter {
// ----------------------------------------------------- Instance Variables
/**
* The default character encoding to set for requests that pass through
* this filter.
*/
protected String encoding = null;
/**
* The filter configuration object we are associated with. If this value
* is null, this filter instance is not currently configured.
*/
protected FilterConfig filterConfig = null;
/**
* Should a character encoding specified by the client be ignored?
*/
protected boolean ignore = true;
// --------------------- Public Methods
/**
* Take this filter out of service.
*/
public void destroy() {
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);
}
}
以上代码可以完全拷贝或者修改类名或包名为你自己的类名，如com.somecompany.filter.SetCharacterEncodingFilter
第二步，配置你的web.xml，加入一下过滤器的内容
<filter>
<filter-name> setCharacterEncoding </filter-name>
<filter-class> com.somecompany.filter.SetCharacterEncodingFilter </filter-class>
<init-param>
<param-name> encoding </param-name>
<param-value> GBK </param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name> setCharacterEncoding </filter-name>
<url-pattern> /* </url-pattern>
</filter-mapping>
注意：如果你的web。xml里有其他过滤器的话，为了解决中文，最好将此段内容拷贝到其他过滤器的前面。有了这个过滤器，你就不用担心中文问题了e
