過濾器

package com.project.filter;

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 CharsetFilter implements Filter {

    @Override
    public void destroy() {
        // TODO Auto-generated method stub

    }

    @Override
    public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
            throws IOException, ServletException {
        arg0.setCharacterEncoding("utf-8");
        arg1.setCharacterEncoding("utf-8");
        arg1.setContentType("text/html; charset=utf-8");

    }

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

    }

}

在 web.xml 中配置過濾器

    <!-- 注冊編碼過濾器 -->
    <filter>
        <filter-name>charset</filter-name>
        <filter-class>com.project.filter.CharsetFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>charset</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>