我们在servlet页面中读取前台的数据时 经常会出现乱码问题
而自己每次都要在servlet中使用
String encoding="utf-8"; request.setCharacterEncoding(enconding); response.setCharacterEncoding(enconding);
来进行编码的转换 会很麻烦
所以使用过滤器 我们可以避免这些重复的工作
web.xml配置
<filter> <filter-name>encodingFilter</filter-name> <filter-class>com.scx.filter.Filter</filter-class> <!-- 初始化参数 --> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <!-- filter映射关系 --> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
Filter
package com.scx.filter;
import java.io.IOException;
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;
public class Filter implements javax.servlet.Filter{
//读取过滤器配置文件
private FilterConfig config;
public void destroy() {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest request=(HttpServletRequest) arg0;
HttpServletResponse response=(HttpServletResponse) arg1;
String encoding=config.getInitParameter("encoding");
if(encoding==null||"".equals(encoding)){
encoding="utf-8";
}
request.setCharacterEncoding(encoding);
response.setCharacterEncoding(encoding);
chain.doFilter(request, response);
}
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
config=arg0;
}
}
这样的话 在servlet里面读取到的数据就不会出现乱码的情况了
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