java用过滤器控制乱码

1.新建过滤器类

（1）实现filter接口

（2）重写init、doFilter、destroy方法

 1 @Override
 2     public void init(FilterConfig filterconfig) throws ServletException {
 3         this.filterconfig = filterconfig;
 4 
 5     }
 6 
 7     @Override
 8     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
 9            String charset=this.filterconfig.getInitParameter("charset");
10            request.setCharacterEncoding(charset);
11            response.setCharacterEncoding(charset);
12            response.setContentType("text/html;charset="+charset+"");
13            chain.doFilter(request, response); 
14     }
15 
16     @Override
17     public void destroy() {
18         // TODO Auto-generated method stub
19 
20     }

2.配置web.xml文件

 1         <filter>
 2         <description>编码格式配置</description>
 3         <filter-class>com.bjsxt.util.filter.CharacterFilter</filter-class>
 4         <filter-name>CharacterFilter</filter-name>
 5         <init-param>
 6             <param-name>charset</param-name>
 7             <param-value>utf-8</param-value>
 8         </init-param>
 9     </filter>
10     <filter-mapping>
11         <filter-name>CharacterFilter</filter-name>
12         <url-pattern>/*</url-pattern>
13     </filter-mapping>

3.注意

编码个式可以在web.xml中设置，也可以直接在doFilter中设置。