我的乐与怒

Spring MVC 的错误处理

Spring MVC 提供多种异常处理方式，但是当我在进行Spring MVC培训时，我发现我的学院经常会感到困惑或者不太适应。

今天我将为你展示多种可能的选项。我们的目标是如果可能的话不在Controller的方法里显式的处理异常。作为横切关注点分别在专用代码里处理更好。

Posted by Vincent on Tuesday, June 30, 2015

用Spring创建RESTful 服务

Posted by Vincent on Thursday, June 25, 2015

dockerpool CA 证书错误

docker被墙后用，拉dockerpool的镜像会出现这个错误 > sudo docker pull dl.dockerpool.com:5000/centos:7 FATA[0000] Error response from daemon: v1 ping attempt failed with error: Get https://dl.dockerpool.com:5000/v1/_ping: tls: oversized record received with length 28012. If this private registry supports only HTTP or HTTPS with an unknown CA certificate, please add `--insecure-registry dl.dockerpool.com:5000` to the daemon's arguments. In the case of HTTPS, if you have access to the registry's CA certificate, no need for the flag; simply place the CA certificate at /etc/docker/certs.d/dl.dockerpool.com:5000/ca.crt 解决方法，在/etc/sysconfig/docker添加 INSECURE_REGISTRY='--insecure-registry dl.dockerpool.com:5000' 版本如下

Posted by Vincent on Sunday, June 14, 2015

安装

如果没有安装epel源先安装

yum install epel-release

先添加mesosphere源

sudo rpm -Uvh http://repos.mesosphere.io/el/7/noarch/RPMS/mesosphere-el-repo-7-1.noarch.rpm

安装mesos 以及运算框架marathon

yum install mesos 
yum install marathon

安装zookeeper

yum install mesosphere-zookeeper

Posted by Vincent on Friday, June 12, 2015

CentOS 6.5 docker 错误

Docker 在centos6.5中安装因为 device-mapper 不正确会报这个错 \n三 6月 10 16:46:56 CST 2015\n time="2015-06-10T16:46:56+08:00" level="info" msg="+job serveapi(unix:///var/run/docker.sock)" time="2015-06-10T16:46:56+08:00" level="info" msg="WARNING: You are running linux kernel version 2.6.32-431.el6.x86_64, which might be unstable running docker. Please upgrade your kernel to 3.8.0." time="2015-06-10T16:46:56+08:00" level="info" msg="Listening for HTTP on unix (/var/run/docker.sock)" /usr/bin/docker: relocation error: /usr/bin/docker: symbol dm_task_get_info_with_deferred_remove, version Base not defined in file libdevmapper.so.1.02 with link time reference 解决方法 sudo yum install device-mapper-event-libs sudo yum reinstall docker

Posted by Vincent on Wednesday, June 10, 2015

在CentOS下安装PPTP的VPN

http://www.black-xstar.com/blog/691.html 最近买了个基于xen的VPS玩玩，安装LAMP没啥意思。国内网络环境不好，干脆安装个VPN试试。对于Linux其实我什么都不会的，在google老师的帮助下，总算给我安装好了，记录下来以便查阅。 VPN常用有两种，一种是openvpn，另一种PPTP。前者开源跨平台功能强大，后者

Posted by Vincent on Tuesday, June 9, 2015

CXF添加Header

CXF的header处理了半天。。。添加拦截器 public class HotelHeaderInterceptor extends AbstractSoapInterceptor { public void handleMessage(SoapMessage message) throws Fault { List<Header> headers = message.getHeaders(); AuthenticationHeader aheader = new AuthenticationHeader(); aheader.setCulture(com.tourico.schemas.webservices.authentication.Culture.EN_US); aheader.setLoginName(username); aheader.setPassword(password); aheader.setVersion(new JAXBElement<String>(new QName("", "version"), String.class, version)); JAXBElement<AuthenticationHeader> authHeaders = new ObjectFactory().createAuthenticationHeader(aheader); Header header; try { header = new Header(authHeaders.getName(), aheader,new JAXBDataBinding(AuthenticationHeader.class)); headers.add(header); message.put(Header.HEADER_LIST, headers); } catch (JAXBException e) { e.printStackTrace(); } } 调用服务之前处理 IDestinationContracts port = service.getIISDestinationHosting() ; Client cxfClient = ClientProxy.getClient(port); cxfClient.getOutInterceptors().add(new HeaderInterceptor(Phase.WRITE));

Posted by Vincent on Sunday, May 10, 2015

用RF24创建无线传感器网络

英文原版 https://maniacbug.wordpress.com/2012/03/30/rf24network/

翻译: Vincent Mi http://vnzmi.com/rf24network-for-wireless-sensor-networking.html

RF24Network网络是一个使用Nordic nRF24L01+ 无线，运行在Arduino兼容硬件的网络层。他的目标是成为Arduino单元通信的除Xbee外的另外一个选择。他提供一个主机地址空间和消息路由最高支持6000个节点，形成一个有能力和可扩展的无线传感器网络系统。同时让两个节点之间的通讯更加简单。

Posted by Vincent on Sunday, May 10, 2015

ENC28J60接线

drivers.rar HanRun HR911105A 14/20 CLKOUT INT WOL SO SI SCK CS RESET VCC GND 接线 ENC28J60 Arduino Due/UNO Arduino Mega VCC 3V3 3V3 CLKOUT ENC-WOL RESET RESET RESET ENC-INT 2 2 GND GND GND SCK 13 52 MISO 12 50 MOSI 11 51 CS 10 53 另外一个库的接法 https://github.com/jcw/ethercard 该库支持DNS,DHCP 测试可用。 – – VCC 3.3V GND GND SCK Pin 13 SO Pin 12 SI Pin 11 CS Pin 8 # Selectable with the ether.begin() function

Posted by Vincent on Friday, May 8, 2015

电磁波初中物理振荡的电场和磁场在空间中以波的形式传播就形成了电磁波，gamma射线、X光、紫外光、可见光、红外光、微波、无线电波和长波无线电，这些都是电磁波。电磁波具有波粒二象性，光子就是量子化的电磁波，是电磁波能量的最小单位。光子的能量和电磁波的波长成反比，比如说，波长最短的gamma射线光子能量高达百万甚至数亿电子伏，医疗和安检用的x光光子能量一般在数百到上万电子伏，紫外光的能量一般在数个到数十电子伏，可见光的能量在1.8（700纳米的红色光）到3.1电子伏（400纳米的蓝色光）之间，红外、微波和无线电波的光子能量就小的多。在电磁波和物质相互作用时，物质只能吸收或者放出整个的光子。