Loginform.html
<title> Change request encoding using filters </title>
<meta http-equiv= "Content-type" content= "text/html;charset=gb2312" >
<body>
<center>
<form method= "POST" action= "Servlet/checkparamservlet" >
<table>
<tr>
<td> User name:</td>
<td><input name= "name" type= "text" ></td>
</tr>
<tr>
<td> Password:</td>
<td><input name= "pass" type= "password" ></td>
</tr>
<tr>
<td></td>
<td>
<input name= "OK" type= "submit" value= "Submission" >
<input name= "Cancel" type= "reset" value= "reset" >
</td>
</tr>
</table>
</form>
</center>
</body>
Checkparamservlet. Java in the servlet
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 ("Out.println ("
Out.println ("
Out.println ("</body>}
public void DoPost (HttpServletRequest request,
HttpServletResponse response)
Throws Servletexception, IOException {
Doget (Request,response);
}
}
Filter inside the 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;
get the encoding configured in Web. xml
this.encoding = Filterconfig.getinitparameter ("encoding");
}
public void DoFilter (
ServletRequest request,
Servletresponse response,
Filterchain chain)
Throws IOException, Servletexception {
if (request.getcharacterencoding () = = null) {
gets the specified encoding
String encode = GetEncoding ();
if (encode! = null) {
set The encoding of the request
Request.setcharacterencoding (encode);
Response.setcharacterencoding (encode);
}
}
Chain.dofilter (request, response);
}
Protected String getencoding () {
return encoding;
}
public void Destroy () {
}
}
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 EE component</display-name>
<description>this is the description of my EE 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 EE component</display-name>
<description>this is the description of my EE 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>
Java Web Experiment Five servlet filter
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