１．页面内容的中文问题

response.setContentType("text/html; charset=utf-8");

２．将JSP编译成JAVA文档的编码问题

pageEncoding="utf-8"

３．从数据库查询出来的中文问题

设置数据库连接后加&useUnicode=true&characterEncoding=utf-8

４．使用RequestDispatcher类的forward方法的乱码问题

response.setContentType("text/html; charset=utf-8");

５．使用中文url的乱码问题,　
<Connector port="8080" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true" />后添加 URIEncoding="GBK",变成如下即可，不过这么改的话，别的非英文，如日文会发生乱码

<Connector port="8080" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="GBK"/>

response.setContentType("text/html; charset=utf-8"); // 设置客户端的编码机制request.setCharacterEncoding("utf-8");  // 设置传入参数的字符集
response.setCharacterEncoding("utf-8");