?? gdsetcharacterencodingfilter.java
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package com.gd.web.filter;
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;
public class GdSetCharacterEncodingFilter implements Filter {
//定義編碼方式
protected String encoding = null;
protected FilterConfig filterConfig = null;
protected boolean ignore = true;
/**
* 初始化
*/
public void init(FilterConfig filterConfig) throws ServletException {
//根據web.xml的設定獲取編碼方式
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
String value = filterConfig.getInitParameter("ignore");
//假如沒有設定ignore,則表示使用設定的編碼方式
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;
}
/**
* 進行過濾,設定編碼
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
HttpServletRequest req = (HttpServletRequest)request;
//加入設定了ignore,或設定了encoding,則使用設定編碼方式
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null) {
request.setCharacterEncoding(encoding);
System.out.println(" 使用web.xml中指定的編碼方式:" + encoding + " 進行編碼。");
}
}
chain.doFilter(request, response);
}
/**
* 銷毀
*/
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
/**
* 獲取編碼方式
* @param request
* @return
*/
protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}
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