前段時(shí)間很忙，項(xiàng)目比較緊，都沒(méi)有時(shí)間寫(xiě)這個(gè)了，今天就寫(xiě)個(gè)我在項(xiàng)目中應(yīng)用的一個(gè)Filter，這個(gè)過(guò)濾器負(fù)責(zé)把定義的文件夾下的所有頁(yè)面采用gbk編碼格式，并且每個(gè)頁(yè)面都不保留緩存。如此的話(huà)就不用在所有的業(yè)務(wù)類(lèi)里面處理中文問(wèn)題，降低了代碼冗余，節(jié)約了開(kāi)發(fā)時(shí)間。下面的這個(gè)類(lèi)就負(fù)責(zé)這個(gè)功能。
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;
import javax.servlet.http.HttpServletResponse;/**
*@author 郝學(xué)武
*設(shè)置字符過(guò)濾
*/
public class ActionFilter implements Filter
{
private String encoding = null; //定義字符編碼，緩存，和Local
private String cache = null;
private String forceLocal;
public void init(FilterConfig filterconfig) throws ServletException //初始化上面的3個(gè)變量，分別從web.xml取得值
{
this.encoding = filterconfig.getInitParameter("encoding");
this.cache = filterconfig.getInitParameter("cache");
this.forceLocal = filterconfig.getInitParameter("forceLocal");
}
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse,
FilterChain filterChain) throws IOException, ServletException //實(shí)現(xiàn)緩存存留，字符過(guò)濾---
{
HttpServletRequest request = (HttpServletRequest) servletRequest;
HttpServletResponse response = (HttpServletResponse) servletResponse;
if (this.cache != null && "false".equals(this.cache.toLowerCase()))
{
response.setHeader("Cache-Control","no-store");
response.setHeader("Pragrma","no-cache");
response.setDateHeader("Expires",0);
}
if ((forceLocal == null) || (forceLocal.length() <=0) || (forceLocal.equalsIgnoreCase("no"))) {}
else {
}
request.setCharacterEncoding(this.encoding);
filterChain.doFilter(servletRequest, servletResponse);
return;
}
/*
* (non-Javadoc)
*
* @see javax.servlet.Filter#destroy()
*/
public void destroy() //銷(xiāo)毀過(guò)濾
{
// TODO Auto-generated method stub
}
}
在web.xml中添加filter
<filter>
<filter-name>WebFilter</filter-name>
<filter-class>
com.cnc.yellow.struts.advertisement.ActionFilter
</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>gbk</param-value>
</init-param>
<init-param>
<param-name>cache</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>forceLocal</param-name>
<param-value>no</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>WebFilter</filter-name>
<url-pattern>/aaa/*</url-pattern> //設(shè)置作用域?yàn)閣ebroot下aaa文件夾下所有頁(yè)面
</filter-mapping>
好了，大家把上面的代碼拷貝到你的項(xiàng)目中，試一下就可以，應(yīng)該沒(méi)什么問(wèn)題，得工作了，今天就到這