一般JSP中汉字传到后台显示乱码的解决方案大致分为：
1.web.xml设置字符编码过滤器，后台java代码：
package com.sls.pub.utils;
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 ServletFilter
implements Filter
{
protected String encoding = null;
protected FilterConfig filterConfig = null;
protected boolean ignore = true;
public void destroy()
{
this.encoding = null;
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException
{
if ((this.ignore) || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null) {
request.setCharacterEncoding(encoding);
}
}
chain.doFilter(request, response);
}
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 String selectEncoding(ServletRequest request)
{
return this.encoding;
}
}
web.xml编写过滤器(此处允许GBK编码)：
<filter>
<filter-name>EncodingFilter</filter-name>
<display-name>EncodingFilter</display-name> <description>EncodingFilter</description>
<filter-class>com.sls.pub.utils.ServletFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GBK</param-value>
</init-param> </filter>
2.设置IDE软件（eg:myeclipse）的编码，这个方法大家可以百度一下，此处略去。
3.第三个也是大家容易忽略的问题，这里细讲一下。
我遇到的问题是，我的整个工程编码格式是GBK，JSP中在URL拼接路径访问时传递的汉字仍正常，传到后台后通过reqest.getParameter("")获取该字段后变成了乱码。我本地使用的myeclipse+tomcat。但是工程在linux环境部署的websphere应用服务器中没有乱码问题。我检查过myeclipse编码设置，然后定位到可能是应用服务器不同导致的。然后我去查tomcat的相关资料，最后发现tomcat的默认编码是iso8859-1。如果要改变其默认的编码，需要在tomcat的server.xml中，修改这段代码：
<Connector port="8888" protocol="HTTP/1.1" connectionTimeout="20000"
redirectPort="8443" />
修改为：
<Connector port="8888" protocol="HTTP/1.1" connectionTimeout="20000"
redirectPort="8443"
URIEncoding="GBK" />
问题解决...
