"DRP" Filter Interceptor-Application

Usage

1. Set up the configuration file:

1  PackageCom.bjpowernode.drp.util.filter;2 3 Importjava.io.IOException;4 5 ImportJavax.servlet.Filter;6 ImportJavax.servlet.FilterChain;7 ImportJavax.servlet.FilterConfig;8 Importjavax.servlet.ServletException;9 Importjavax.servlet.ServletRequest;Ten ImportJavax.servlet.ServletResponse; One  A /** - * Uniform processing of character sets using filter -  * @authorYin the  * -  */ -  Public classCharsetencodingfilterImplementsFilter { -  + @Override -      Public voiddestroy () { +  A     } at  - @Override -      Public voidDoFilter (servletrequest request, servletresponse response, -Filterchain chain)throwsIOException, servletexception { -          -         //Set character sets inRequest.setcharacterencoding ("GB18030"); -         //Continue execution to Chain.dofilter (request, response); +     } -  the @Override *      Public voidInit (Filterconfig arg0)throwsservletexception { $     Panax Notoginseng  -     } the  +}

2, configure the Web. XML configuration file

1<web-app version= "2.5" xmlns= "Http://java.sun.com/xml/ns/javaee"2Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"3Xsi:schemalocation= "Http://java.sun.com/xml/ns/javaee4http//java.sun.com/xml/ns/javaee/web-app_2_5.xsd ">5     6<!--filename and file-relative path--7<filter>8<filter-name>CharsetEncodingFilter</filter-name>9<filter-class>com.bjpowernode.drp.util.filter.charsetencodingfilter</filter-class>Ten</filter> One  A<!--file names and blocked pages- -<filter-mapping> -<filter-name>CharsetEncodingFilter</filter-name> the<url-pattern>*.jsp</url-pattern> -</filter-mapping> -      -</web-app>

"Improved"-the character set is obtained by reading the XML file

Web. XML file:

1<web-app version= "2.5" xmlns= "Http://java.sun.com/xml/ns/javaee"2Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"3Xsi:schemalocation= "Http://java.sun.com/xml/ns/javaee4http//java.sun.com/xml/ns/javaee/web-app_2_5.xsd ">5     6<!--filename and file-relative path--7<filter>8<filter-name>CharsetEncodingFilter</filter-name>9<filter-class>com.bjpowernode.drp.util.filter.charsetencodingfilter</filter-class>Ten<init-param> One<param-name>encoding</param-name> A<param-value>GBK</param-value> -</init-param> -</filter> the  -<!--file names and blocked pages- -<filter-mapping> -<filter-name>CharsetEncodingFilter</filter-name> +<url-pattern>*.jsp</url-pattern> -</filter-mapping> +      A</web-app>

Filter file

1  PackageCom.bjpowernode.drp.util.filter;2 3 Importjava.io.IOException;4 5 ImportJavax.servlet.Filter;6 ImportJavax.servlet.FilterChain;7 ImportJavax.servlet.FilterConfig;8 Importjavax.servlet.ServletException;9 Importjavax.servlet.ServletRequest;Ten ImportJavax.servlet.ServletResponse; One  A /** - * Uniform processing of character sets using filter -  * @authorYin the  * -  */ -  Public classCharsetencodingfilterImplementsFilter { -  +     PrivateString endcoding; - @Override +      Public voiddestroy () { A  at     } -  - @Override -      Public voidDoFilter (servletrequest request, servletresponse response, -Filterchain chain)throwsIOException, servletexception { -          in         //Set character sets - request.setcharacterencoding (endcoding); to         //Continue execution + Chain.dofilter (request, response); -     } the  *     //Initialize Method $ @OverridePanax Notoginseng      Public voidInit (Filterconfig filterconfig)throwsservletexception { -          //read the value of the character set in the Web. xml File the          This. endcoding = Filterconfig.getinitparameter ("Encoding"); + System.out.println (endcoding); A  the     } +  -}

Request.getparameter () and Request.getattribute () differencesJavaweb Filters FilterJavaweb Learning Summary (42)--filter (filter) Learning

Summary: Constantly improve their coding efficiency!

"DRP" Filter Interceptor-Application