再谈java web中文编码问题，这次稍微有些复杂，先说遇到的问题。
一、遇到的问题
1、用ajax中的load方法加载文件
$("#customerTypeLevelRelList").load("<%=CONTEXT%>/jsp_lib/store/web/customerPrice.jsp", {customerRootId:customerRootId, storeId:<%=store.getStoreId()%>});
其中customerRootId为中文“洪海亮”，传到customerPrice.jsp取到的却是乱码
String customerRootId = request.getParameter("customerRootId");
2、load方法普及
3、传入的是数据对象，则发送的是post请求，但是系统中用post请求发送的中文参数没有问题。
二、问题原因
看其调用栈，红色标注的地方，多了一个SQLFilter，在web.xml中确实配置了并且只是针对.jsp才过滤，防止数据库注入的
<filter-mapping>
<filter-name>SQL Filter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
customerPrice.jsp line: 18
customerPrice_jsp(HttpJspBase).service(HttpServletRequest,HttpServletResponse) line: 98
customerPrice_jsp(HttpServlet).service(ServletRequest,ServletResponse) line: 717
JspServletWrapper.service(HttpServletRequest,HttpServletResponse, boolean) line: 388
JspServlet.serviceJspFile(HttpServletRequest,HttpServletResponse, String, Throwable, boolean) line: 313
JspServlet.service(HttpServletRequest,HttpServletResponse) line: 260
JspServlet(HttpServlet).service(ServletRequest,ServletResponse) line: 717
ApplicationFilterChain.internalDoFilter(ServletRequest,ServletResponse) line: 290
ApplicationFilterChain.doFilter(ServletRequest,ServletResponse) line: 206
SiteMeshFilter(ContentBufferingFilter).bufferAndPostProcess(FilterChain,HttpServletRequest, HttpServletResponse, Selector) line: 169
SiteMeshFilter(ContentBufferingFilter).doFilter(ServletRequest,ServletResponse, FilterChain) line: 126
MyConfigurableSiteMeshFilter(ConfigurableSiteMeshFilter).doFilter(ServletRequest,ServletResponse, FilterChain) line: 163
MyConfigurableSiteMeshFilter.doFilter(ServletRequest,ServletResponse, FilterChain) line: 81
ApplicationFilterChain.internalDoFilter(ServletRequest,ServletResponse) line: 235
ApplicationFilterChain.doFilter(ServletRequest,ServletResponse) line: 206
OrgFilter.doFilter(ServletRequest, ServletResponse,FilterChain) line: 204
ApplicationFilterChain.internalDoFilter(ServletRequest,ServletResponse) line: 235
ApplicationFilterChain.doFilter(ServletRequest,ServletResponse) line: 206
SetCharacterEncodingFilter.doFilter(ServletRequest,ServletResponse, FilterChain) line: 142
ApplicationFilterChain.internalDoFilter(ServletRequest,ServletResponse) line: 235
ApplicationFilterChain.doFilter(ServletRequest,ServletResponse) line: 206
SQLFilter.doFilter(ServletRequest,ServletResponse, FilterChain) line: 52
ApplicationFilterChain.internalDoFilter(ServletRequest,ServletResponse) line: 235
ApplicationFilterChain.doFilter(ServletRequest,ServletResponse) line: 206
StandardWrapperValve.invoke(Request, Response) line: 233
StandardContextValve.invoke(Request, Response) line: 191
StandardHostValve.invoke(Request, Response) line: 127
ErrorReportValve.invoke(Request, Response) line: 103
StandardEngineValve.invoke(Request, Response) line: 109
CoyoteAdapter.service(Request, Response) line: 293
Http11AprProcessor.process(long) line: 879
Http11AprProtocol$Http11ConnectionHandler.process(long)line: 600
AprEndpoint$Worker.run() line: 1703
Thread.run() line: 745
其中用到了，这个时候还没有设置setCharacterEncoding，因此采用默认编码格式ISO-8859-1解码，由于ajax中post请求默认是用UTF-8编码的，所以出现了乱码。
Iterator values = httpRequest.getParameterMap().values().iterator();// 获取所有的表单参数
Iterator values2 = httpRequest.getParameterMap().values().iterator();// 获取所有的表单参数
SetCharacterEncodingFilter中虽然再对编码格式进行设置，这时候已经没有用了（post表单提交的参数的解码是在第一次调用request.getParameter也包括getParameterMap时发生的），也就是说已经按照ISO-8859-1解码了，再设置编码格式已经没用了。
由于ajax中post请求默认是用UTF-8编码的，这也就说明为什么SetCharacterEncodingFilter中对ajax请求都设置了UTF-8编码格式
三、解决方法
调整filter的顺序，将SetCharacterEncodingFilter放在首位，保证解码之前设置了编码格式