〔CharacterEncodingHttpServletRequestWrapper.java〕

package creator.common.filter;

import javax.servlet.http.*;

public class CharacterEncodingHttpServletRequestWrapper extends HttpServletRequestWrapper {

??? private String ecoding = null;
??? private String oldEncoding = null;

??? public CharacterEncodingHttpServletRequestWrapper(HttpServletRequest request,String encoding) {
??????? super(request);
??????? this.ecoding = encoding;
??????? this.oldEncoding = request.getCharacterEncoding();
??? }

??? public String getParameter(String value) {
??????? try{
??????????? if((oldEncoding == null || isIOS88591(oldEncoding)) && super.getParameter(value)!=null){
??????????????? return new String(super.getParameter(value).getBytes("iso-8859-1"),ecoding);
??????????? }
??????????? else{
??????????????? return super.getParameter(value);
??????????? }
???????? }
??????? catch(Exception e){
??????????? e.printStackTrace();
??????????? return null;
??????? }
??? }

??? private boolean isIOS88591(String endcoding){
??????? endcoding = endcoding.toLowerCase();
??????? return endcoding.startsWith("iso")&& (endcoding.indexOf("8859") != -1) && endcoding.endsWith("1");
??? }
}

〔CharacterEncodingHttpServletResponseWrapper.java〕

package creator.common.filter;

import javax.servlet.http.*;

public class CharacterEncodingHttpServletResponseWrapper extends HttpServletResponseWrapper {

??? private String ecoding = null;

??? public CharacterEncodingHttpServletResponseWrapper(HttpServletResponse response,String encoding) {
??????? super(response);
??????? this.ecoding = encoding;
??? }

??? /* (non-Javadoc)
???? * @see javax.servlet.ServletResponse#setContentType(java.lang.String)
???? */
??? public void setContentType(String value) {
??????? super.setContentType("text/html;charset="+ecoding);
??? }

}

〔CharsetEncodingFilter.java〕

package creator.common.filter;

import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;

public class CharsetEncodingFilter implements Filter {
??? private FilterConfig config = null;
??? private String RequestEncoding = null;
??? private String ResponseEncoding = null;

??? public void init(FilterConfig arg0) throws ServletException {
??????? this.config = arg0;
??????? this.RequestEncoding = config.getInitParameter("RequestEncoding");
??????? this.ResponseEncoding = config.getInitParameter("ResponseEncoding");
??? }

??? /* (non-Javadoc)
???? * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
???? */
??? public void doFilter(ServletRequest req, ServletResponse res, FilterChain fc)
??????? throws IOException, ServletException {
??????? if(this.config == null){
??????????? return;
??????? }
??????? HttpServletRequest request = (HttpServletRequest)req;
??????? HttpServletResponse response = (HttpServletResponse)res;

??????? CharacterEncodingHttpServletRequestWrapper? mrequestw? = new CharacterEncodingHttpServletRequestWrapper(request,ResponseEncoding);
??????? CharacterEncodingHttpServletResponseWrapper wresponsew = new CharacterEncodingHttpServletResponseWrapper(response,ResponseEncoding);
??????? fc.doFilter(mrequestw,wresponsew);
??? }

??? public void destroy() {
??? }

}

〔web.xml〕

? <filter>
??? <filter-name>CharsetEncoding</filter-name>
??? <filter-class>javabean.com.CharsetEncodingFilter</filter-class>
??? <init-param>
????? <param-name>RequestEncoding</param-name>
????? <param-value>iso-8859-1</param-value>
??? </init-param>
??? <init-param>
????? <param-name>ResponseEncoding</param-name>
????? <param-value>gb2312</param-value>
??? </init-param>
? </filter>
? <filter-mapping>
??? <filter-name>CharsetEncoding</filter-name>
??? <url-pattern>/*</url-pattern>
? </filter-mapping>