字符集设置

package com.web;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class SetCharacterEncodingFilter extends HttpServlet implements Filter {
private FilterConfig filterConfig;

protected String encoding = null;

//Handle the passed-in FilterConfig
public void init(FilterConfig filterConfig) {
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");

}

public FilterConfig getFilterConfig() {
return filterConfig;
}

public void setFilterConfig(FilterConfig filterConfig) {
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
}

//Process the request/response pair
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterChain) {
try {
if (encoding != null) {
request.setCharacterEncoding(encoding);
}
filterChain.doFilter(request, response);
} catch (ServletException sx) {
filterConfig.getServletContext().log(sx.getMessage());
} catch (IOException iox) {
filterConfig.getServletContext().log(iox.getMessage());
}
}

//Clean up resources
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
}

web.xml 加入

<filter>
<filter-name>Set Character Encoding</filter-name>
<filter-class>com.web.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GB2312</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Set Character Encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>