初学JSP，开发系统时遇到了一些中文乱码问题
我上网找了许多方法都不能根本解决问题。
jsp页面都写了<%@ page contentType="text/html;charset=gb2312" language="java" %>，
数据库里的字符类型是NVACHAR
不用filter过滤时，存入到数据库中是正常的中文，JSP页面显示出来也是正常中文，但数据从表单传递到Struts那时成乱码了，问号了。
用了filter后，表单数据传递到struts里是正常中文，但存储到数据库中成了乱码。
为什么了？？
我上网找了许多方法都不能根本解决问题。
jsp页面都写了<%@ page contentType="text/html;charset=gb2312" language="java" %>，
数据库里的字符类型是NVACHAR
不用filter过滤时，存入到数据库中是正常的中文，JSP页面显示出来也是正常中文，但数据从表单传递到Struts那时成乱码了，问号了。
用了filter后，表单数据传递到struts里是正常中文，但存储到数据库中成了乱码。
为什么了？？
import java.io.FileWriter;
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;
/**
* @author Dave
*/
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);
BufferedWriter bw = new BufferedWriter(new FileWriter("/temp/insertlog.log"));;
//bw.
//response.getOutputStream().println(); } /**
* 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); }}//-----------------------------------------------------------
//web.xml <filter>
<filter-name>SetCharacterEncoding</filter-name>
<filter-class>filter.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GB2312</param-value>
</init-param>
<init-param>
<param-name>ignore</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>SetCharacterEncoding</filter-name>
<servlet-name>Action Servlet</servlet-name>
</filter-mapping>
<filter-mapping>
<filter-name>SetCharacterEncoding</filter-name>
<servlet-name>Faces Servlet</servlet-name>
</filter-mapping>
<filter-mapping>
<filter-name>SetCharacterEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
response.setCharacterEncoding(encoding);
public static final String toUnicode(String str)
{
try
{
return new String(str.getBytes("iso-8859-1"),"gb2312");
}
catch(Exception e)
{
return str;
}
}
我发现页面传递到struts的ACTION时，中文字码是ISO-8859-1,Struts显示不出正常中文，但数据库接受后，能在库中正常显示
从库中传出来也是ISO-8859-1的编码，页面也能正常显示，但我用过滤器后，FILTER把中文数据转成GBK编码，
struts能正常显示，接着它把这GBK编码的中文字存入库后就成了乱码。
所以有没有这种过滤方法，从页面提交到Struts时过滤成GBK，对数据操作完后，struts把数据存入库前，过滤为ISO-8859-1呢？