(车辆管理系统)2018-07-18实训第三天笔记

学习了过滤器的使用

web.xml文件下的配置

 <filter>
  <filter-name>encoding</filter-name>
  <filter-class>tool.FileterTool</filter-class>
  <init-param>
  <param-name>encode</param-name>
  <param-value>utf-8</param-value>
  </init-param>
  </filter>
  <filter-mapping>
  <filter-name>encoding</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>

文件过滤器java文件

package tool;

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;



/**
 * 过滤器
 * @author Geek
 *
 */
public class FileterTool implements Filter{
	private String encode = "";

	public void destroy() {
		// TODO Auto-generated method stub
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		//设置编码
		request.setCharacterEncoding(encode);
		//继续往下执行
		chain.doFilter(request, response);
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		//获取初始化编码格式
		encode = arg0.getInitParameter("encode");
	}
	
}

前几天断更了，今天一起补上