loginform.html
<html>
<head>
<title>使用过滤器改变请求编码</title>
<meta http-equiv="Content-Type" content="text/html;charset=GB2312">
</head>
<body>
<center>
<h2>请输入用户名和口令：</h2>
<form method="post" action="servlet/CheckParamServlet">
<table>
<tr>
<td>用户名：</td>
<td><input name="name" type="text"></td>
</tr>
<tr>
<td>口 令：</td>
<td><input name="pass" type="password"></td>
</tr>
<tr>
<td></td>
<td>
<input name="ok" type="submit" value="提交">
<input name="cancel" type="reset" value="重置">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
Servlet里的CheckParamServlet .java
package servlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CheckParamServlet extends HttpServlet{
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String name = request.getParameter("name");
String pass = request.getParameter("pass");
response.setContentType("text/html;charset=gb2312");
PrintWriter out = response.getWriter();
out.println("<html><head><title>Param Test</title></head>");
out.println("<h3 align=center>你的用户名为："+name+"</h3>");
out.println("<h3 align=center>你的口令为："+pass+"</h3>");
out.println("</body></html>");
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}
filter里面的EncodingFilter
package filter;
import java.io.IOException;
import javax.servlet.*;
public class EncodingFilter implements Filter {
protected String encoding = null;
protected FilterConfig config;
public void init(FilterConfig filterConfig) throws ServletException {
this.config = filterConfig;
// 得到在web.xml中配置的编码
this.encoding = filterConfig.getInitParameter("Encoding");
}
public void doFilter(
ServletRequest request,
ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
if (request.getCharacterEncoding() == null) {
// 得到指定的编码
String encode = getEncoding();
if (encode != null) {
//设置request的编码
request.setCharacterEncoding(encode);
response.setCharacterEncoding(encode);
}
}
chain.doFilter(request, response);
}
protected String getEncoding() {
return encoding;
}
public void destroy() {
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<display-name>meng</display-name>
<servlet>
<servlet-name>CheckParamServlet</servlet-name>
<display-name>This is the display name of my J2EE component</display-name>
<description>This is the description of my J2EE component</description>
<servlet-class>servlet.CheckParamServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CheckParamServlet</servlet-name>
<url-pattern>/servlet/CheckParamServlet</url-pattern>
</servlet-mapping>
<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>
<servlet>
<servlet-name>CheckParamServlet</servlet-name>
<servlet-class>servlet.CheckParamServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>EncodingFilter</servlet-name>
<display-name>This is the display name of my J2EE component</display-name>
<description>This is the description of my J2EE component</description>
<servlet-class>filter.EncodingFilter</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CheckParamServlet</servlet-name>
<url-pattern>/servlet/check</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>EncodingFilter</servlet-name>
<url-pattern>/servlet/EncodingFilter</url-pattern>
</servlet-mapping>
<filter>
<filter-name>EncodingFilter</filter-name>
<filter-class>filter.EncodingFilter</filter-class>
<init-param>
<param-name>Encoding</param-name>
<param-value>gb2312</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>EncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
