过滤器的使用

新建一个EncodeFilter类用来解决编码问题

在xml中进行配置

  <filter>
  <filter-name>EncodeFilter</filter-name>
  <filter-class>com.test.filter.EncodeFilter</filter-class>
  <init-param>
  <param-name>Encoding</param-name>
  <param-value>UTF-8</param-value>
  </init-param>
  </filter>
  <filter-mapping>
  <filter-name>EncodeFilter</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>

EncodeFilter类中具体代码

package com.test.filter;

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;

/**
 * Servlet Filter implementation class EncodeFilter
 */
@WebFilter("/EncodeFilter")
public class EncodeFilter implements Filter {
	
	private String encoding;

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here
		request.setCharacterEncoding(encoding);
		// pass the request along the filter chain
		chain.doFilter(request, response);
	}

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

}

注册时用中文用户名进行注册

在配置文件中是设置好了对所有都进行过滤，编码格式都设置为“UTF-8”

效果图