JAVA WEB中用使用filter实现字符编码转换

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.annotation.WebFilter;


public class CharFilter implements Filter {


String encoding = null;


public CharFilter() {
// TODO Auto-generated constructor stub
}


public void destroy() {
// TODO Auto-generated method stub
encoding = null;
}


public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
// TODO Auto-generated method stub
// place your code here
if (encoding != null) {
request.setCharacterEncoding(encoding);
response.setContentType("text/html;charset=" + encoding);
}
// pass the request along the filter chain
chain.doFilter(request, response);
}


public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
encoding = fConfig.getInitParameter("encoding");
}

}

配置filter

<filter>
<filter-name>CharFilter</filter-name>
<filter-class>CharFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>