Compile a filter chain to implement the following functions:
1. Compile the filter program EncodingFilter to implement Chinese transcoding in POST mode.
2. Compile the filter program liuyanfilter to convert the user input username "Zhang" into "Li" and convert the user input message content "Cambridge" into "****".
Other functions page of the program:
1. Write liuyanform. jsp. This page is used to complete the form input, including: User Name, message content, submit button.
2. Compile liuyanservlet to redirect the program to liuyanresult. jsp in the form of request forwarding in the doPost () method of the program.
3. Compile the liuyanresult. jsp program, and output the user name and message content submitted by the user on this page.
Note: Both filters filter the liuyanservlet program.
[Html]
<% @ Page language = "java" import = "java. util. *" pageEncoding = "GBK" %>
<Html>
<Head>
</Head>
<Body>
<Form action = "MessageServlet" method = "post">
<Table>
<Tr>
<Td>
Title:
<Input type = "text" name = "title" size = "30">
</Td>
</Tr>
<Tr>
<Td>
Content:
<Textarea rows = "5" cols = "40" name = "content"> </textarea>
</Td>
</Tr>
<Tr>
<Td>
<Input type = "submit" name = "submit" value = "submit">
</Td>
</Tr>
</Table>
</Form>
</Body>
</Html>
[Html]
<% @ Page language = "java" import = "java. util. *" pageEncoding = "gbk" %>
<Html>
<Head>
</Head>
<Body>
Username: <% = request. getAttribute ("title") %> <br/>
Message: <% = request. getAttribute ("content") %>
</Body>
</Html>
[Html]
<? Xml version = "1.0" encoding = "UTF-8"?>
<Web-app version = "2.4"
Xmlns = "http://java.sun.com/xml/ns/j2ee"
Xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance"
Xsi: schemaLocation = "http://java.sun.com/xml/ns/j2ee
Http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd>
<Filter>
<Filter-name> CharacterFilter </filter-name>
<Filter-class> com. mars. filter. CharacterFilter </filter-class>
</Filter>
<Filter>
<Filter-name> WordFilter </filter-name>
<Filter-class> com. mars. filter. WordFilter </filter-class>
</Filter>
<Filter-mapping>
<Filter-name> CharacterFilter </filter-name>
<Url-pattern>/MessageServlet </url-pattern>
</Filter-mapping>
<Filter-mapping>
<Filter-name> WordFilter </filter-name>
<Url-pattern>/MessageServlet </url-pattern>
</Filter-mapping>
<Servlet>
<Servlet-name> MessageServlet </servlet-name>
<Servlet-class> com. mars. servlet. MessageServlet </servlet-class>
</Servlet>
<Servlet-mapping>
<Servlet-name> MessageServlet </servlet-name>
<Url-pattern>/MessageServlet </url-pattern>
</Servlet-mapping>
<Welcome-file-list>
<Welcome-file> submit. jsp </welcome-file>
</Welcome-file-list>
</Web-app>
[Java]
Package com. mars. filter;
Import java. io. IOException;
Import java. io. UnsupportedEncodingException;
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. http. HttpServletRequest;
Import javax. servlet. http. HttpServletRequestWrapper;
Import javax. servlet. http. HttpServletResponse;
Public class CharacterFilter implements Filter {
Public void init (FilterConfig arg0) throws ServletException {
System. out. println ("Call init ");
}
Public void destroy (){
System. out. println ("Call destroy ");
}
// Solve the garbled post method
Public void doFilter (ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) resp;
Request. setCharacterEncoding ("GBK ");
Response. setCharacterEncoding ("GBK ");
Response. setContentType ("text/html; charset = GBK ");
Chain. doFilter (request, response );
// Chain. doFilter (req, resp );
}
}
[Java]
Package com. mars. filter;
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. http. HttpServletRequest;
Import javax. servlet. http. HttpServletRequestWrapper;
Import javax. servlet. http. HttpServletResponse;
Public class WordFilter implements Filter {
Private FilterConfig config = null;
Public void init (FilterConfig filterConfig) throws ServletException {
}
Public void doFilter (ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
String title = req. getParameter ("title ");
String content = req. getParameter ("content ");
Title = title. replace ("Zhang", "Li ");
Content = content. replace ("Cambridge ","****");
Req. setAttribute ("title", title );
Req. setAttribute ("content", content );
Chain. doFilter (request, response );
}
Public void destroy (){
Config = null;
}
}
[Java]
Package com. mars. servlet;
Import java. io. IOException;
Import javax. servlet. ServletException;
Import javax. servlet. http. HttpServlet;
Import javax. servlet. http. HttpServletRequest;
Import javax. servlet. http. HttpServletResponse;
Public class MessageServlet extends HttpServlet {
/* Public void doGet (HttpServletRequest request, HttpServletResponse response)
Throws ServletException, IOException {
DoPost (request, response );
}*/
Public void doPost (HttpServletRequest request, HttpServletResponse response)
Throws ServletException, IOException {
Request. getRequestDispatcher ("result. jsp"). forward (request,
Response );
}
}
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