一、编写过滤器工具,在过滤器中将编码解码方式改为utf-8:
因为index.jsp提交表单到名为DoServlet,由DoServlet请求转发到main.jsp,所以我直接过滤DoServlet
注:新版本是用注解直接注册,而不用在web.xml中注册,所以注解中默认为url,所以过滤时必须和需要过滤的目标url相同
二、结果:
三、代码
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>登录</title> </head> <body> <form action="${pageContext.request.contextPath }/DoServlet" method="post"> 用户名:<input id="name" name="name" type="text" /><br/> 密码:<input id="password" name="password" type="password" /><br/> <input type="submit" value="登录" /> </form> </body> </html>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>主页</title>
</head>
<body>
<h1>${name }</h1><br/>
<h1>${password }</h1>
</body>
</html>
package servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/DoServlet") public class DoServlet extends HttpServlet { private static final long serialVersionUID = 1L; public DoServlet() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("我是doServlet"); String name = request.getParameter("name"); String password = request.getParameter("password"); request.setAttribute("name", name); request.setAttribute("password", password); request.getRequestDispatcher("main.jsp").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
package filter; import java.io.IOException; 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; @WebFilter(urlPatterns = "/DoServlet") public class Filter implements javax.servlet.Filter { public Filter() { } public void destroy() { // TODO Auto-generated method stub } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { response.setContentType("text/html;charset=utf-8"); request.setCharacterEncoding("utf-8"); System.out.println("filter执行前"); chain.doFilter(request, response); System.out.println("filter执行后"); } /** * @see Filter#init(FilterConfig) */ public void init(FilterConfig fConfig) throws ServletException { // TODO Auto-generated method stub } }