web.xml配置

<!-- 編碼過濾器 -->
    <filter>
        <filter-name>Utf_8Filter</filter-name>
        <filter-class>com.studentManagement.filter.Utf_8Filter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value
 
>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>Utf_8Filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

servlet類

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import
 
 java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;

@WebFilter(filterName = "Utf_8Filter")
public class Utf_8Filter implements Filter {
    private String encoding;
    private HashMap<String, String> params = new HashMap<String, String>();

    // 專案結束時就已經進行銷燬
    public
 
 void destroy() {
        params = null;
        encoding = null;
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        request.setCharacterEncoding(encoding);
       // response.setCharacterEncoding(encoding);
        response.setContentType("text/html;charset="+encoding);
        chain.doFilter(request, response);
    }

    // 專案啟動時就已經進行讀取
    public void init(FilterConfig config) throws ServletException {
        encoding = config.getInitParameter("encoding");
        for (Enumeration<?> e = config.getInitParameterNames(); e.hasMoreElements(); ) {
            String name = (String) e.nextElement();
            String value = config.getInitParameter(name);
            params.put(name, value);
        }
    }

}