CharacterEncodingFilter.java继承了HttpFilter.java用于过滤，是编码格式统一为gbk，但需要在web.xml中配置配置代码为

<filter>

<filter-name>CharacterEncodingFilter</filter-name>

<filter-class>com.util.CharacterEncodingFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>CharacterEncodingFilter</filter-name>

<url-pattern>/*</url-pattern>

<dispatcher>REQUEST</dispatcher>

<dispatcher>FORWARD</dispatcher>

<dispatcher>INCLUDE</dispatcher>

</filter-mapping>

package com.util;

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

public abstract class HttpFilter implements Filter

{

protected FilterConfig config;

public void init(FilterConfig config) throws ServletException

{

this.config = config;

init();

}

public void init() throws ServletException

{

}

public void doFilter(ServletRequest request,

ServletResponse response,

FilterChain chain)

throws IOException, ServletException

{

doFilter((HttpServletRequest)request, (HttpServletResponse)response, chain);

}

public abstract void doFilter(HttpServletRequest request,

HttpServletResponse response,

FilterChain chain)

throws IOException, ServletException;

public void destroy()

{

}

public String getInitParameter(String name)

{

return config.getInitParameter(name);

}

public void log(String content)

{

config.getServletContext().log(content);

}

public ServletContext getServletContext()

{

return config.getServletContext();

}

}

package com.util;

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.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class CharacterEncodingFilter extends HttpFilter{

@Override

public void doFilter(HttpServletRequest request,

HttpServletResponse response, FilterChain chain)

throws IOException, ServletException {

request.setCharacterEncoding("gbk");

response.setCharacterEncoding("gbk");

chain.doFilter(request, response);

}

}