关于post和get的中文乱码处理
get：
（1）转码：String username=request.getParameter("username");
String un=new String(username.getBytes("iso-8859-1"),"UTF-8");
（2）在tomcat配置文件server.xml 之connector标签配置文件中加URIEncoding="UTF-8"，可以改善get提交的中文乱码(方法不太灵活)
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443"
useBodyEncodingForURI="true"
/>
或者在同样的地方useBodyEncodingForURI="true"(根据响应页面的编码格式而改变，即对应的是request.setCharacterEncoding("UTF-8");
post
request.setCharacterEncoding("UTF-8");
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配置字符过滤器：web.xml配置spring字符集过滤器或者自定义过滤器为UTF-8
<!-- spring字符编码过滤器start-->
<filter>
<!--① Spring 编码过滤器 -->
<filter-name>encodingFilter</filter-name>
<filter-class>
org.springframework.web.filter.CharacterEncodingFilter
</filter-class>
<!--② 编码方式 -->
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<!--③ 强制进行编码转换 -->
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<!-- ② 过滤器的匹配 URL -->
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- spring字符编码过滤器end-->
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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">