yanhua365’s gists

yanhua365 / freemarker_null_error.log

Created December 20, 2013 08:02

FreeMarker提示使用了空（null）变量，并提示了正确的使用方法。

	Tip: If the failing expression is known to be legally null/missing,
	either specify a default value with myOptionalVar!myDefault,
	or use <#if myOptionalVar??>when-present<#else>when-missing</#if>.
	(These only cover the last step of the expression;
	to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)??

yanhua365 / chess-move.html

Created December 19, 2013 12:49

用canvas绘制象棋，且支持棋子拖拽移动。

	<!doctype html>
	<html>
	<head>
	<meta http-equiv=Content-Type content="text/html;charset=utf-8">
	<title>canvas 象棋 </title>


	<script>
	var layout = {padding: 30, cell: 50, chessRadius: 20, fontSize: 36, width: 400, height: 450, offsetWidth: 460, offsetHeight: 510};
	var style = {

yanhua365 / Md5Hex.java

Created December 19, 2013 05:02

Java计算文件的MD5值

String md5 = org.apache.commons.codec.digest.DigestUtils.md5Hex(fis);

yanhua365 / ParseRequestBodyToBytes.java

Last active May 24, 2022 03:28

从HTTP Request里取得body内容得到byte数组的方法。

	public byte[] parse(HttpServletRequest request) {
	byte[] input = null;
	try {
	InputStream is = request.getInputStream();
	ByteArrayOutputStream byteStream = new ByteArrayOutputStream();

	while (true) {
	int c = is.read();
	if (c == -1) break;
	byteStream.write((byte) c);

yanhua365 / JUnitTempFolderSample.java

Created December 16, 2013 05:01

使用JUnit做单元测试时需要用到临时文件的，可以使用TemporaryFolder。 http://junit.org/javadoc/4.9/org/junit/rules/TemporaryFolder.html

	public static class HasTempFolder {
	@Rule
	public TemporaryFolder folder= new TemporaryFolder();

	@Test
	public void testUsingTempFolder() throws IOException {
	File createdFile= folder.newFile("myfile.txt");
	File createdFolder= folder.newFolder("subfolder");
	// ...
	}

yanhua365 / EssRepositoryHelperImpl.java

Created December 16, 2013 01:48

对Hibernate的对象明确指定加载哪些关联属性，避免在session关闭后访问出现LazyInitialize错误。

	public void initialize(Object entity, String... properties){
	for(String name : properties){
	try {
	String property = BeanUtils.getProperty(entity, name);
	Hibernate.initialize(property);
	} catch (Throwable e) {
	logger.error("initialize lazy property occurs error.", e);
	throw Throwables.propagate(e);
	}
	}

yanhua365 / simple_http_server.js

Created December 12, 2013 13:03

简单的nodejs的HTTP Server

	var http = require("http"), sys = require('sys');

	http.createServer(function(request, response) {
	response.writeHead(200, {"Content-Type": "text/plain"});
	response.write("Welcome to Node.js!");
	response.end();
	}).listen(6600);

	sys.puts('Server running at http://127.0.0.1:8006/');

yanhua365 / PySimpleHTTPServer.py

Created December 12, 2013 03:07

用Python一行命令快速在当前目录启动一个HTTP服务器

python -m SimpleHTTPServer 9393

yanhua365 / chess-bg.html

Created December 11, 2013 14:04

用Canvas画的象棋棋盘

	<!doctype html>
	<html>
	<head>
	<meta http-equiv=Content-Type content="text/html;charset=utf-8">
	<title>canvas 象棋 </title>
	</head>

	<body>
	<canvas id="chess-canvas" width="410" height="460"></canvas>
	<script>

yanhua365 / StringTemplateRenderer.java

Last active December 31, 2015 00:39

用Freemarker渲染一个字符串模板

	protected String renderResponse(Map ctx, String stringTemplate) {
	Configuration cfg = new Configuration();
	StringTemplateLoader stringLoader = new StringTemplateLoader();
	stringLoader.putTemplate("updateResponseTemplate", stringTemplate);
	cfg.setTemplateLoader(stringLoader);
	Writer out = new StringWriter(2048);

	try {
	Template tpl = cfg.getTemplate("updateResponseTemplate","utf-8");
	tpl.process(ctx, out);

yanhua365 yanhua365