十、添加过滤器

方法1、添加自己的过滤器

1.1建包com.myz.web.filters，在包下新建Myfliter类

package com.myz.web.filters;

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.HttpServlet;

public class MyFilter extends HttpServlet implements Filter {

    public void doFilter(ServletRequest arg0, ServletResponse arg1,
            FilterChain arg2) throws IOException, ServletException {
        // TODO Auto-generated method stub
        arg0.setCharacterEncoding("utf-8");
        arg2.doFilter(arg0, arg1);
    }

    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub

    }

}

1.2.web.xml中配置filter信息

<filter>
        <filter-name>myFilter</filter-name>
        <filter-class>com.myz.web.filters.MyFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>myFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

方法2.使用spring提供的过滤器，仅需在web.xml中配置

<filter>
    <filter-name>encoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>encoding</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>