使用filter來改變r(jià)equest的編碼.
當(dāng)沒有指定request的編碼的時(shí)候,從客戶端得到的數(shù)據(jù)是iso-8859-1編碼的(request.getParameter()得到傳遞的參數(shù)值);
但是我們怎么來改變r(jià)equest的編碼呢?
方法有很多種!
比如:在getRequestDispatcher("/jsp/jsptoserv/hello.jsp").forward(request, response);之前修改
request的編碼,那么在jsp/jsptoserv/hello.jsp中得到的參數(shù)值就是制定的編碼的字符。
本文我們使用Filter來修改request的編碼
1)首先編寫filter類:
package myFilter;
import java.io.IOException;
import javax.servlet.*;
public class ChangeCharsetFilter implements Filter {
protected String encoding = null;/////要制定的編碼,在web.xml中配置
protected FilterConfig filterConfig = null;
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
if (request.getCharacterEncoding() == null){
?String encoding = getEncoding();////得到指定的編碼名字
?if (encoding != null)
?request.setCharacterEncoding(encoding);////設(shè)置request的編碼
?}
chain.doFilter(request, response);///有機(jī)會(huì)執(zhí)行下一個(gè)filter
}
?public void init(FilterConfig filterConfig) throws ServletException {
?this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");///得到在web.xml中配置的編碼
?}
?protected String getEncoding() {
?return (this.encoding);///得到指定的編碼
}
}
2。編輯web.xml文件
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
? PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
? "<web-app>
<filter>
<filter-name>SetCharacterEncoding</filter-name>
?<filter-class>myFilter.ChangeCharsetFilter </filter-class>
?<init-param>
?<param-name>encoding</param-name>
<param-value>GB2312</param-value>//////指定編碼為GB2312
</init-param>
?</filter>
<filter-mapping>
?<filter-name>SetCharacterEncoding</filter-name>
<url-pattern>/*</url-pattern>////////對于所有的request改變其編碼
</filter-mapping>
</web-app>
///
3。寫一個(gè)a.jsp
<%@ page contentType="text/html; charset=GB2312" %>
<html>
<head></head>
<body>
<%
String name=request.getParameter("name");///本來這里得到字符是iso-8859-1編碼的,不能直接
在Console中輸出的,但是現(xiàn)在改變了request的編碼方式,此時(shí)的name的編碼是GB2312,所以能正確在Console中顯示的。
System.out.println(name);
%>
<form action="a.jsp" method="post">
<input type="text" name="name">
<input type="submit">
</form>
<%=name%>
</body>
</html>
完!
關(guān)于中文處理的問題就寫這些了!