上周有同事反馈，通过ZKUI这个工具去上传带有中文的节点值时会出现中文无法显示的问题。最终发现编码是NCR编码，全称是：Numeric Character Reference。
这里引入一段维基百科的描述。
A numeric character reference (NCR) is a common markup construct used in SGML and SGML-derived markup languages such as HTML and XML. It consists of a short sequence of characters that, in turn, represents a single character. Since WebSgml, XML and HTML 4, the code points of the Universal Character Set (UCS) of Unicode are used. NCRs are typically used in order to represent characters that are not directly encodable in a particular document (for example, because they are international characters that don‘t fit in the 8-bit character set being used, or because they have special syntactic meaning in the language). When the document is interpreted by a markup-aware reader, each NCR is treated as if it were the character it represents.
由于zookeeper本身是可以存储中文的（引用一段zookeeper网站上的介绍），所以基本确认是ZKUI工具本身的问题。
The ZooKeeper Data Model
ZooKeeper has a hierarchal name space, much like a distributed file system. The only difference is that each node in the namespace can have data associated with it as well as children. It is like having a file system that allows a file to also be a directory. Paths to nodes are always expressed as canonical, absolute, slash-separated paths; there are no relative reference. Any unicode character can be used in a path subject to the following constraints:
ZKUI个JAVA开源工具，可以下载源码。发现网页功能是基于HttpServlet实现的，没有使用其它一些高级的产品，比如Spring MVC等。知道是使用HttpServlet后，就会去对比Spring MVC对于中文的处理，然后就很容易去解决中文被NCR编码的问题。
这个项目结构是不是很像Spring MVC?
这里可以增加一个filter为请求对象以及响应对象增加UTF-8的处理。通过这步，ZKUI上提供的单节点的CRUD就可以正常处理中文节点值了。
@WebFilter(filterName = "filtercharset", urlPatterns = "/*")
public class CharsetFilter implements Filter {
@Override
public void init(FilterConfig fc) throws ServletException {
//Do Nothing
}
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain fc) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
request.setCharacterEncoding(StandardCharsets.UTF_8.toString());
response.setCharacterEncoding(StandardCharsets.UTF_8.toString());
fc.doFilter(req, res);
}
@Override
public void destroy() {
//Do nothing
}
}
上面只是解决了页面GET,POST解决单节点的CRUD过程中的编码问题，对于文件上传还需要特殊处理。看这段源码，细节我删除了，只留下主体结构以及编码部分的代码：
public class Import extends HttpServlet {
private final static Logger logger = LoggerFactory.getLogger(Import.class);
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
logger.debug("Importing Action!");
try {
Iterator iter = items.iterator();
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();
if (item.isFormField()) {
if (item.getFieldName().equals("scmOverwrite")) {
scmOverwrite = item.getString();
}
if (item.getFieldName().equals("scmServer")) {
scmServer = item.getString();
}
if (item.getFieldName().equals("scmFilePath")) {
scmFilePath = item.getString();
}
if (item.getFieldName().equals("scmFileRevision")) {
scmFileRevision = item.getString();
}
} else {
uploadFileName = item.getName();
//原来的逻辑是item.getString()，我增加了指定编码
sbFile.append(item.getString(StandardCharsets.UTF_8.toString()));
}
}
List<String> importFile = new ArrayList<>();
//获取节点的值......
ZooKeeperUtil.INSTANCE.importData(importFile, Boolean.valueOf(scmOverwrite), ServletUtil.INSTANCE.getZookeeper(request,
//处理其它一些内容
request.getSession().setAttribute("flashMsg", "Import Completed!");
response.sendRedirect("/home");
} catch (FileUploadException | IOException | InterruptedException | KeeperException ex) {
logger.error(Arrays.toString(ex.getStackTrace()));
ServletUtil.INSTANCE.renderError(request, response, ex.getMessage());
}
}
}
上传的文件格式也有一定的要求:
else if (!inputLine.matches("/.+=.+=.*")) {
throw new IOException("Invalid format at line " + lineCnt + ": " + inputLine);
}
这里简单介绍下Dockerfile
FROM java:8
MAINTAINER jim <jiangmin168168@hotmail.com>
WORKDIR /var/app
ADD zkui-*.jar /var/app/zkui.jar
ADD config.cfg /var/app/config.cfg
ENTRYPOINT [ "java", "-jar", "/var/app/zkui.jar" ]
EXPOSE 9090
docker build -t jiangmin168168/zkui .
上面的jiangmin168168是在docker网站上的ID，可以将image上传到网站上去，如果只是本地用可以不用加这个ID。当然即使加了ID，只通过build也不能实现上传功能，还需要登录docker，通过push命令去实现。
由于官方的docker网站在国内非常慢，我基本没有成功过，期待良久最后无情的显示超时。最后经过同事的介绍使用了国内的DaoCloud提供的docker加速器，就是docker的一个镜像，这样大部分原本需要从docker.io下载的内容转到国内的镜像了，速度火箭上升。
docker images
发现这个image还很大，估计是自动引入java8的原因，后面可以研究下自带jdk来看看能否减少空间。
docker run -dit --name zkui --hostname zkui-host -v /data:/data -p 9090:9090 zkui:latest
简单说明下这些参数
ZKUI中的NCR是在什么地方引入的？回头还需要再查找下
原文：http://www.cnblogs.com/ASPNET2008/p/6082303.html