JSP filter encoding character encoding filter

First, create two JSP pages: A.jsp and b.jsp.

1, a.jsp

1 <!--Landing Form -2 <formAction= "Checkloginservlet.do"Method= "POST">3     <inputtype= "text"name= "username">4     <inputtype= "Password"name= "Password" />5     <inputtype= "Submit"value= "Submit">6 </form>

2, b.jsp

1 <!--  --2 ${requestscope.username}    Welcome ...

Second, create the Servlet:CheckLoginServlet.js for the login judgment

1 Importjava.io.IOException;2 Importjavax.servlet.ServletException;3 ImportJavax.servlet.annotation.WebServlet;4 ImportJavax.servlet.http.HttpServlet;5 Importjavax.servlet.http.HttpServletRequest;6 ImportJavax.servlet.http.HttpServletResponse;7 8@WebServlet ("/checkloginservlet.do")9  Public classCheckloginservletextendsHttpServlet {Ten     Private Static Final LongSerialversionuid = 1L; One      A     protected voidDoPost (HttpServletRequest request, httpservletresponse response)throwsservletexception, IOException { -         /** - * Login Verification: If the user name and password are the same, jump to the b.jsp page. Otherwise jump back to the a.jsp page and log back in.  the          */ -String name = Request.getparameter ("username"); -String Password = request.getparameter ("Password"); -         if(name.equals (password) && Name.trim ()! = "" && password.trim ()! = ""){ +Request.setattribute ("username", name); -Request.getrequestdispatcher ("b.jsp"). Forward (request, response); +             return; A}Else{ atResponse.sendredirect ("a.jsp"); -         } -     } -}

Third, configure the initialization parameter encoding in the Web. xml file with a value of utf-8.

< Context-param >    < Param-name >encoding</param-name>    <Param-value >utf-8</param-value></Context-param  >

Four, write character encoding filter: Encodingfilter.java, filter all the files in the root directory.

1 Importjava.io.IOException;2 ImportJavax.servlet.Filter;3 ImportJavax.servlet.FilterChain;4 ImportJavax.servlet.FilterConfig;5 Importjavax.servlet.ServletException;6 Importjavax.servlet.ServletRequest;7 ImportJavax.servlet.ServletResponse;8 ImportJavax.servlet.annotation.WebFilter;9 Ten@WebFilter ("/*") One  Public classEncodingfilterImplementsFilter { A      -     PrivateString encoding; -      the      PublicEncodingfilter () {} -  -      Public voidInit (Filterconfig fconfig)throwsservletexception { -encoding = Fconfig.getservletcontext (). Getinitparameter ("Encoding"); +     } -  +      Public voidDoFilter (ServletRequest request, servletresponse Response,filterchain chain)throwsIOException, servletexception { A request.setcharacterencoding (encoding); at Chain.dofilter (request, response); -     } -  -      Public voiddestroy () {} -  -}

V. Finish ...

JSP filter encoding character encoding filter