對於初學jsp的人來說，最頭疼的問題之一就是jsp的中文亂碼問題了，這個亂碼問題讓我除錯了好久，終於發現了顯示不亂碼的方法。

1、在要顯示資訊的頁面開頭加上 

request.setCharacterEncoding("gb2312");

然後就可以正常顯示中文了。

2、一勞永逸的方法，使用過濾器。

SetCharacterEncodingFilter.java

package aaa;

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 SetCharacterEncodingFilter implements Filter {
 
    protected FilterConfig filterConfig = null;
    protected String encoding = "";
 
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
    }
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
 
        request.setCharacterEncoding(this.encoding);
        response.setCharacterEncoding(this.encoding);
        response.setContentType("text/html;charset="+this.encoding);
 
        chain.doFilter(request, response);
    }
    public void destroy() {
        this.encoding = null;
        this.filterConfig = null;
    }
}
 

<filter>
            <description>CharacterEncodingFilter</description>
            <display-name>CharacterEncodingFilter</display-name>
            <filter-name>CharacterEncodingFilter</filter-name>
            <filter-class>
              aaa.SetCharacterEncodingFilter
            </filter-class>
            <init-param>
    <param-name>encoding</param-name>
    <param-value>utf-8</param-value>
            </init-param>
        </filter>
     
        <filter-mapping>
            <filter-name>CharacterEncodingFilter</filter-name>
            <url-pattern>/s</url-pattern>
        </filter-mapping>
 

請求轉發：req.getRequestDispatcher("xxx.jsp").forward(req, resp);