代理模式

代理模式

为另一个对象提供一个替身或占位符以访问这个对象.

代理模式中远程代理和动态代理比较常用

Elasticsearch配置ik分词器

假定你已经安装了elasticsearch2.1.0和maven, 下面的步骤针对elasticsearch2.1.0有效, 其它版本可能不使用

下载ik

因为我的elasticsearch是2.1.0,所以去这里下载https://github.com/medcl/elasticsearch-analysis-ik/releases/tag/v1.6.1

其它版本的elasticsearch对应的ik去https://github.com/medcl/elasticsearch-analysis-ik 下载

解压ik，并进入ik

执行 mvn package 编译ik

复制文件

将elasticsearch-analysis-ik-master/target/releases/elasticsearch-analysis-ik-1.6.1.zip 拷贝到es的plugin/ik目录下并解压

同时将elasticsearch-analysis-ik-master/config/ik文件夹拷贝到es的config下

然后重启es,就可以了.

Java发送邮件 

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package com.google.utils;

import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message.RecipientType;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

/**
<dependency>
	<groupId>javax.mail</groupId>
	<artifactId>mail</artifactId>
	<version>1.4.7</version>
</dependency>
*/
public class EmailUtil {
	
	private static Properties properties = null;
	
	public static void init(Properties properties)
	{
		EmailUtil.properties = properties;
	}
	
	public static void send(String subject, String message) {
		try {
			Authenticator authenticator = new Authenticator() {
			    @Override
			    protected PasswordAuthentication getPasswordAuthentication() {
			        String userName = properties.getProperty("mail.user");
			        String password = properties.getProperty("mail.password");
			        return new PasswordAuthentication(userName, password);
			    }
			};
			Session session = Session.getInstance(properties, authenticator);
			MimeMessage mime = new MimeMessage(session);
			InternetAddress form = new InternetAddress(properties.getProperty("mail.user"));
			mime.setFrom(form);
			InternetAddress to = new InternetAddress(properties.getProperty("main.to"));
			mime.setRecipient(RecipientType.TO, to);

			mime.setSubject(subject);
			mime.setContent(message, "text/html;charset=UTF-8");
			
			Transport.send(mime);
		} catch (AddressException e) {
			e.printStackTrace();
		} catch (MessagingException e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) {
		Properties properties = new Properties();
		properties.put("mail.smtp.auth", "true");
		properties.put("mail.smtp.host", "smtp.exmail.qq.com");
		properties.put("mail.user", "user1@example.com");
		properties.put("mail.password", "password");
		properties.put("main.to","user2@qq.com");
		
		EmailUtil.init(properties);
		EmailUtil.send("hello", "这是来自大洋彼岸的声音!");
	}

}

将启动命令中包含某个字符串的进行杀死 

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[root@dn01 testbash]# ps -ef | grep hello
root     24794  7457  0 11:09 pts/2    00:00:00 sh hello.sh
root     24910  7457  0 11:09 pts/2    00:00:00 sh hello.sh
root     25295  7457  0 11:11 pts/2    00:00:00 grep hello

使用

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ps aux | grep hello | grep -v grep |awk '{print $2}'| xargs kill -9

可以将上述的前两个进程杀死

Swift - 使用NSURLSession同步获取数据(通过添加信号量)

首先非常感谢代码的原作者,为了查询方便我就在这里又留了一份,请见谅.

原文http://www.hangge.com/blog/cache/detail_816.html

过去通过 NSURLConnection.sendSynchronousRequest() 方法能同步请求数据。从iOS9起，苹果建议废除 NSURLConnection，使用 NSURLSession 代替 NSURLConnection。

如果想要 NSURLSession 也能够同步请求，即数据获取后才继续执行下面的代码，使用信号、信号量就可以实现。

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//创建NSURL对象
let urlString:String="http://www.hangge.com"
let url:NSURL! = NSURL(string:urlString)
//创建请求对象
let request:NSURLRequest = NSURLRequest(URL: url)
         
let session = NSURLSession.sharedSession()
         
let semaphore = dispatch_semaphore_create(0)
         
let dataTask = session.dataTaskWithRequest(request,
    completionHandler: {(data, response, error) -> Void in
        if error != nil{
            print(error?.code)
            print(error?.description)
        }else{
            let str = NSString(data: data!, encoding: NSUTF8StringEncoding)
            print(str)
        }
                 
        dispatch_semaphore_signal(semaphore)
}) as NSURLSessionTask
         
//使用resume方法启动任务
dataTask.resume()
         
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER)
print("数据加载完毕！")
//继续执行其他代码.......