在WEB应用开发中,其中编码问题一直为开发者头疼。在JAVA WEB开发中,我们可以编写过滤器(filter)解决编码问题,而不用在每个JSP/SERLVET中使用request.setCharacterCoding()设置编码。
如下编写的过滤器代码:
WEB.XML
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app version="2.4"
- xmlns="http://java.sun.com/xml/ns/j2ee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
- http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
- <filter>
- <filter-name>charsetCodingFilter</filter-name>
- <filter-class>CharsetCodingFilter</filter-class>
- <init-param>
- <param-name>charset</param-name>
- <param-value>gbk</param-value>
- </init-param>
- </filter>
- <filter-mapping>
- <filter-name>charsetCodingFilter</filter-name>
- <url-pattern>/*</url-pattern>
- </filter-mapping>
- </web-app>
CharsetCodingFilter.java
- 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;
- public class CharsetCodingFilter implements Filter {
- private String charset;
- public void destroy() {
- // TODO Auto-generated method stub
- }
- public void doFilter(ServletRequest req, ServletResponse resp,
- FilterChain chain) throws IOException, ServletException {
- // TODO Auto-generated method stub
- req.setCharacterEncoding(charset);
- chain.doFilter(req, resp);
- }
- public void init(FilterConfig config) throws ServletException {
- // TODO Auto-generated method stub
- this.charset=config.getInitParameter("charset");
- }
- }