前端使用:encodeURIComponent(encodeURIComponent("示例")) 转换两次
var queryStr = $('input[name="queryStr"]').val();
queryStr = encodeURIComponent(encodeURIComponent(queryStr));
后台java:使用URLDecoder.decode()进行转换即中
String queryStr = ServletRequestUtils.getStringParameter(request,"queryStr","");
queryStr = URLDecoder.decode(queryStr,"UTF-8");