?webxml? 字符UTF-8 處理
<filter>
??<filter-name>Set Character Encoding</filter-name>
??<filter-class>
???util.web.SetCharacterEncodingFilter
??</filter-class>
??<init-param>
???<param-name>encoding</param-name>
???<param-value>utf-8</param-value>
??</init-param>
?</filter>
?<filter-mapping>
??<filter-name>Set Character Encoding</filter-name>
??<url-pattern>/*</url-pattern>
?</filter-mapping>
SetCharacterEncodingFilter.java
package util.web;
import java.io.BufferedWriter;
import java.io.FileWriter;
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;
/**
?* @author Dave
?*/
public class SetCharacterEncodingFilter implements Filter {
??? //???? ----------------------------------------------------- Instance Variables
??? /**
??? * The default character encoding to set for requests that pass through
??? * this filter.
??? */
??? protected String encoding = null;
??? /**
??? * The filter configuration object we are associated with. If this value
??? * is null, this filter instance is not currently configured.
??? */
??? protected FilterConfig filterConfig = null;
??? /**
??? * Should a character encoding specified by the client be ignored?
??? */
??? protected boolean ignore = true;
??? //???? --------------------------------------------------------- Public Methods
??? /**
??? * Take this filter out of service.
??? */
??? public void destroy() {
??????? this.encoding = null;
??????? this.filterConfig = null;
??? }
??? /**
??? * Select and set (if specified) the character encoding to be used to
??? * interpret request parameters for this request.
??? *
??? * @param request The servlet request we are processing
??? * @param result The servlet response we are creating
??? * @param chain The filter chain we are processing
??? *
??? * @exception IOException if an input/output error occurs
??? * @exception ServletException if a servlet error occurs
??? */
??? public void doFilter(
??????? ServletRequest request,
??????? ServletResponse response,
??????? FilterChain chain)
??????? throws IOException, ServletException {
??????? //???? Conditionally select and set the character encoding to be used
??????? if (ignore || (request.getCharacterEncoding() == null)) {
??????????? String encoding = selectEncoding(request);
??????????? if (encoding != null) {
??????????????? request.setCharacterEncoding(encoding);
??????????? }
??????? }
???????
??????? //???? Pass control on to the next filter
??????? chain.doFilter(request, response);
??????? BufferedWriter? bw = new BufferedWriter(new FileWriter("/temp/insertlog.log"));;
??????? //bw.
??????? //response.getOutputStream().println();
??? }
??? /**
??? * Place this filter into service.
??? *
??? * @param filterConfig The filter configuration object
??? */
??? 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")) {
??????????? this.ignore = true;
??????? } else if (value.equalsIgnoreCase("yes")) {
??????????? this.ignore = true;
??????? } else {
??????????? this.ignore = false;
??????? }
??? }
??? //???? ------------------------------------------------------ Protected Methods
??? /**
??? * Select an appropriate character encoding to be used, based on the
??? * characteristics of the current request and/or filter initialization
??? * parameters. If no character encoding should be set, return
??? * <code>null</code>.
??? * <p>
??? * The default implementation unconditionally returns the value configured
??? * by the <strong>encoding</strong> initialization parameter for this
??? * filter.
??? *
??? * @param request The servlet request we are processing
??? */
??? protected String selectEncoding(ServletRequest request) {
??????? return (this.encoding);
??? }
}
?