一、确保jsp页面中<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>和<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">编码为UTF-8；

二、post方式

配置字符过滤器

package com.util.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;

/** *//**
* 采用Filter统一设置处理字符集 
* @author songfeng
* @version 1.0
* Apr 1, 2010
*/
public class CharsetEncodingFilter implements Filter {

private String encoding = "UTF-8";

public void destroy() {
}

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
    FilterChain filterChain) throws IOException, ServletException {
   servletRequest.setCharacterEncoding(this.encoding);
   filterChain.doFilter(servletRequest, servletResponse);
}

public void init(FilterConfig filterConfig) throws ServletException {
   this.encoding = filterConfig.getInitParameter("encoding");
}
}

配置web.xml

<filter>
   <filter-name>CharsetEncodingFilter</filter-name>
   <filter-class>com.util.filter.CharsetEncodingFilter</filter-class>
   <init-param>
    <param-name>encoding</param-name>
    <param-value>UTF-8</param-value>
   </init-param>
</filter>

<filter-mapping>
   <filter-name>CharsetEncodingFilter</filter-name>
   <url-pattern>*.jsp</url-pattern>
</filter-mapping>

<filter-mapping>
   <filter-name>CharsetEncodingFilter</filter-name>
   <url-pattern>/servlet/*</url-pattern>
</filter-mapping>

三、get方法

1、配置tomcat中server.xml

<Connector port="80" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" disableUploadTimeout="true" URIEncoding="UTF-8"/>

2、在要传递参数的时候进行转码（如不转码奇数中文字符最后一个字符乱码）

（1）JSP传值方式：
跳转页：
<a href=info.jsp?info="<%= java.net.URLEncoder.encode("中文汉字","GBK") %>">跳转</a>
接收页
<%
     String info_str = new String(request.getParameter("info"),"ISO8859-1");
     out.print(info_str); //输出接收值
%>
（2）JS传值方式：
先用encodeURI()进行编码
var p = "你好吗？";
var url = "aaa.jsp?param=" + encodeURI(p);
然后在服务器端要解码
<%
String param = request.getParameter("p");
param = new String(param.getBytes("ISO-8859-1"),"UTF-8");
%>
四、ajax乱码

在要传递中文参数的js中转码：encodeURIComponent(“×××”)