/** * */package cn.itcast.test;import java.io.UnsupportedEncodingException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;/** * @author 国真 * 继承HttpServletRequestWrapper类是采用了装饰者模式 */public class CharSetRequest extends HttpServletRequestWrapper { public CharSetRequest(HttpServletRequest request) { super(request); //调用父类的构造器，给父类传递底层对象 } //增强getParameter()方法 @Override public String getParameter(String name) { String value = super.getParameter(name); //判断当前请求是否为get请求，若是则回退，重解 if (getMethod().equalsIgnoreCase("GET")) { try { value = new String(value.getBytes("iso-8859-1"), "utf-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } //返回 return value; }}

package cn.itcast.test;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;import javax.servlet.http.HttpServletRequest;/** * 处理全站编码问题 * @author 国真 * */public class CharSetFilter implements Filter { public CharSetFilter() { // TODO Auto-generated constructor stub } //释放 public void destroy() { // TODO Auto-generated method stub } //执行过滤功能 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { request.setCharacterEncoding("utf-8"); //只处理post请求 response.setContentType("text/html;charset=utf-8"); //处理响 应的编码 //创建山寨版的request CharSetRequest req = new CharSetRequest((HttpServletRequest)request); //放行市把request掉包 chain.doFilter(req, response); } //初始化 public void init(FilterConfig fConfig) throws ServletException { }}

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <display-name>tools</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>CharSetFilter</filter-name> <filter-class>cn.itcast.test.CharSetFilter</filter-class> </filter> <filter-mapping> <filter-name>CharSetFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <servlet-name>VerifyCodeServlet</servlet-name> <servlet-class>cn.itcast.vcode.servlet.VerifyCodeServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>VerifyCodeServlet</servlet-name> <url-pattern>/VerifyCodeServlet</url-pattern> </servlet-mapping></web-app>