過濾器的使用

新建一個EncodeFilter類用來解決編碼問題

在xml中進行配置

<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類中具體代碼

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");
    }

}

註冊時用中文用戶名進行註冊

在配置文件中是設置好了對全部都進行過濾，編碼格式都設置爲「UTF-8」

效果圖