JSP three kinds of Chinese solutions and differences __jsp

Method One: It only works for a single string
String name=request.getparameter ("name");
Name=new String (name.getbytes ("iso-8859-1"), "Utf-8");

method Two: Valid for the current page
Request.setcharacterencoding ("GBK");
String name=request.getparameter ("name");

method Three: Valid for the entire Web site
Using filter principle
public class setencodingfilter implements filter {    protected  String encoding = null;     protected FilterConfig filterConfig = null;     protected boolean ignore = true;     public void destroy ()  {         this.encoding = null;         this.filterConfig = null;    &NBSP}     public void dofilter (ServletRequest request,  servletresponse response,              Filterchain chain)  throws ioexception, servletexception {         if  (ignore | |   (request.getcharacterencoding ()  == null))  {  &nbsP;         request.setcharacterencoding (selectEncoding (request));         }          Chain.dofilter (Request, response);    &NBSP}     public void init (Filterconfig filterconfig)  throws servletexception {        this.filterconfig  = filterConfig;         this.encoding = filterconfig.getinitparameter (" Encoding ");         string value = filterconfig.getinitparameter (" Ignore ");         if  (value == null)              this.ignore = true;         else if  (value.equalsignorecase("true")                 | |  value.equalsignorecase ("yes")              this.ignore = true;         else              this.ignore = false;    &NBSP}     protected string selectencoding (ServletRequest  request)  {        return  (this.encoding)     &NBSP}     public filterconfig getfilterconfig ()  {         return filterConfig;    &NBSP}     public void setfilterconfig (FilterConfig  Filterconfig)  {        this.filterconfig = filterconFig    &NBSP}}

Web.xml
        <filter>          <filter-name>SetCharsetEncodingFilter</filter-name>          <filter-class>filter. Setencodingfilter</filter-class>         <init-param>              <param-name>encoding</param-name >             <param-value>gbk</ Param-value>         </init-param>     < /filter>     <filter-mapping>         < Filter-name>setcharsetencodingfilter</filter-name>          <url-pattern>/*</url-pattern>     </filter-mapping>