Javaweb Project Custom Filter (character set filter) __javaweb

a simple character set filter

This content is designed to record the process of extending the filter in the Javaweb project and does not completely solve the garbled problem in the project 1, custom a filter class

Package com.jiuqi.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; /** 1. Title:characterfilter<br> 2. 
 Description: Character Set filter 3. 4. @author Qiuchangjin 5. @version April 13, 2018 */public class Characterfilter implements Filter {private String character;//Character Set encoding type/*
        * * Initialization of filter/@Override public void init (Filterconfig filterconfig) throws Servletexception {
    Reads the initialization parameters of the filter configuration in the web.xml character = Filterconfig.getinitparameter ("character"); @Override public void Dofilter (ServletRequest servletrequest, Servletresponse servletresponse, Filterchain filt Erchain) throws IOException, servletexception {//Read initialization parameters character Servletrequest.setcharact
        Erencoding (character); servletresponse.seTcharacterencoding (character); Servletresponse.setcontenttype ("text/html;
        Charset=utf-8 "); Filterchain.dofilter (ServletRequest, servletresponse); Release, go to next filter}/** * Before the filter is destroyed, the recovery of some resources/@Override public void Destroy () {}}

2, add Filter in the Web.xml in the Web-inf directory, filter loading is in order

<?xml version= "1.0" encoding= "UTF-8"?> <web-app xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xmlns= "Http://java.sun.com/xml/ns/javaee" xsi:schemalocation= "Http://java.sun.com/xml/ns/javaee http:// Java.sun.com/xml/ns/javaee/web-app_2_5.xsd "id=" webapp_id "version=" 2.5 "> &LT;DISPLAY-NAME&GT;MYTEST&LT;/DISPL Ay-name> <!--define a filter--> <filter> <!--filter name--> <filter-name>c Haracterfilter</filter-name> <!--filter implementation class--> &LT;FILTER-CLASS&GT;COM.JIUQI.FILTER.CHARACTE
            Rfilter</filter-class> <!--initialization parameters--> <init-param> <!--parameter names--> <param-name>character</param-name> <!--parameter values, encoded as Utf-8--> &LT;PARAM-VALUE&G T;utf-8</param-value> </init-param> </filter> <!--define the URL address to intercept--> <f
Ilter-mapping> <!--filter's name-->        <filter-name>CharacterFilter</filter-name> <!--to intercept the URL, here is all intercept--> <url-patt Ern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index. Jsp</welcome-file> </welcome-file-list> </web-app>

3. Project Code Structure