Custom character encoding Filter __ encoding

This filter is mainly for post, get submit request to intercept, set the required coding, solve the Chinese garbled problem.

The Custom character encoding filter class Encodingfilter implements the filter interface, realizes the Init, Dofilter, Destory method

Encodingfilter.java:

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.httpservletresponse;public class Encodingfilter implements filter{private Filterconfig
 Filterconfig = null;
 
 Private String encoding = NULL; 
  Initializes public void init (Filterconfig filterconfig) throws servletexception {this.filterconfig = Filterconfig;
  
 this.encoding = Filterconfig.getinitparameter ("encoding"); public void Dofilter (ServletRequest request, servletresponse response, Filterchain Filterchain) throws IOException,
  servletexception {HttpServletRequest req = (httpservletrequest) request;
  
  HttpServletResponse res = (httpservletresponse) response;
  SYSTEM.OUT.PRINTLN ("Request Address:" +req.getrequesturi (). toString ()); SYSTEM.OUT.PRINTLN ("Default request encoding:" +req.geTcharacterencoding ()); 
  Sets the request character encoding request.setcharacterencoding (encoding); 
     
  Set Response character encoding response.setcharacterencoding (encoding);
     
    SYSTEM.OUT.PRINTLN ("Set Request after Encoding:" +req.getcharacterencoding ()); if ("Get") Equalsignorecase (Req.getmethod (). Trim () ()) {//package the request, complete the encoding conversion of the parameter in the URL req = n
    EW Gethttpservletrequestwrapper (req,encoding);
 //Execute Next filter filterchain.dofilter (req, res);
  }//Destroy public void Destroy () {this.filterconfig = null;
  
 this.encoding = null;
 Public Filterconfig Getfilterconfig () {return filterconfig;
 public void Setfilterconfig (Filterconfig filterconfig) {this.filterconfig = Filterconfig;
 
 }
 }

The GET request is packaged, the request wrapper class Gethttpservletrequestwrapper is defined, the Httpservletrequestwrapper class is inherited, and the encoding conversion of the URL parameter in the GET request is implemented.

Gethttpservletrequestwrapper.java:

Import Java.io.unsupportedencodingexception;import javax.servlet.http.HttpServletRequest; Import Javax.servlet.http.HttpServletRequestWrapper;
 
 public class Gethttpservletrequestwrapper extends Httpservletrequestwrapper {private String encoding = "UTF-8";
 Public Gethttpservletrequestwrapper (HttpServletRequest request) {super (request);
  Public Gethttpservletrequestwrapper (httpservletrequest request,string encoding) {super (request);
 this.encoding = encoding;
  @Override Public String getparameter (string name) {string param = Super.getparameter (name);
  if (param = = null) {param = null;
  }else{param = Encodingconvert (param);
 return param; /** * encode and convert parameters in URL/public string Encodingconvert (string param) {try {return   
         New String (Param.trim (). GetBytes ("Iso-8859-1"), encoding);   
         catch (Unsupportedencodingexception e) {return param;  }   
     }
}

Configure filters in Web.xml:

<?xml version= "1.0" encoding= "UTF-8"?> <web-app version=
"2.5" xmlns= "http://java.sun.com/xml/ns/" 
 Java ee " 
 xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance " 
 xsi:schemalocation=" http://java.sun.com/ Xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd ">
    <!--custom character encoding filter-->
  < filter>
   <filter-name>EncodingFilter</filter-name>
   <filter-class> com.eyet.framework.web.filter.encodingfilter</filter-class>
   <init-param>
    <param-name >encoding</param-name>
    <param-value>UTF-8</param-value>
  </init-param>
  </filter>
  
  <filter-mapping>
   <filter-name>EncodingFilter</filter-name>
   <url-pattern>/*</url-pattern>
  </filter-mapping>
 <!--custom character encoding filter end--> <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
 </welcome-file-list >