Chinese garbled Filter

First, create a class:

 

Public class encodingfilter implements filter {<br/> // encoding format <br/> private string encoding = NULL; <br/> Public void dofilter (servletrequest request, servletresponse response, <br/> filterchain chain) throws ioexception, servletexception {<br/> httpservletrequest httprequest = (httpservletrequest) request; <br/> If (httprequest. getmethod (). equals ("get") {<br/> request = new request (httprequest); <br/>} <Br/> request. setcharacterencoding (this. encoding); <br/> chain. dofilter (request, response); <br/>}< br/>/** <br/> * init implements the javax interface. servlet. filter. init <br/> * Indicates obtaining the web. the value of the parameter "encoding" in XML, both UTF-8 <br/> * <param-Name> encoding </param-Name> <param-value> UTF-8 </param-value> <br/> */<br/> Public void Init (filterconfig FC) throws servletexception {<br/> This. encoding = FC. getinitparameter ("encoding"); <br />}< Br/> Public void destroy () {<br/> This. encoding = NULL; <br/>}< br/>/** <br/> * extended httpservletrequestwrapper? <Br/> */<br/> class request extends httpservletrequestwrapper {<br/> Public request (httpservletrequest request) {<br/> super (request ); <br/>}< br/>/** <br/> * convert the internal code of the data read from the form, convert ISO characters to GBK <br/> */<br/> Public String toChina (string input) {<br/> try {<br/> byte [] bytes = input. getbytes ("ISO8859-1"); <br/> return new string (bytes, encoding); <br/>} catch (exception ex) {<br/>}< br/> return NULL; <br/>} <Br/> private httpservletrequest gethttpservletrequest () {<br/> return (httpservletrequest) super. getrequest (); <br/>}< br/>/** <br/> * read the parameter list, corrected the Chinese problem <br/> * override javax. getparametervalues: intercepts JSP-passed parameters and converts them to Chinese using toChina (). <br/> */<br/> Public String [] getparametervalues (string name) {<br/> string values [] = gethttpservletrequest (). getparametervalues (name); <br/> If (values! = NULL) {<br/> for (INT I = 0; I <values. length; I ++) {<br/> values [I] = toChina (Values [I]); <br/>}< br/> return values; <br/>}< br/>} 

Configure in Web. xml

 

<! -- Character filter configuration --> <br/> <filter-Name> encodingfilter </filter-Name> <br/> <filter-class> COM. JWC. util. filter. encodingfilter </filter-class> <br/> <init-param> <br/> <param-Name> encoding </param-Name> <br/> <param-Value> UTF-8 </param-value> <br/> </init-param> <br/> </filter> 

 

<Filter-mapping> <br/> <filter-Name> encodingfilter </filter-Name> <br/> <URL-pattern>/* </url-pattern> <br /> </filter-mapping> <br/> <filter-mapping>