Design Patterns
----Proxy (
Agent
)
Mode
GOF
:Provides a proxy for other objects to control access to this object. Not like flyweight. Proxy is itself the meaning of the agent. The reason for access control for an object is to use it when we really need it, or some function of the object. In a forum system (such as the very famous "Tianya"), browsing the for
To sum up is:1, the agent when the client knows the server, through the proxy to access the server, then the agent is the server2, reverse proxy when the client does not know the server side, the server knows the client, through the proxy to access the server, then the agent is the clientThe concept of a forward proxyThe forward agent, the legendary agent, works
1. Forward Proxy: The Agent object is the client;For example, some companies control the company computer can only access the local area network and a few external network URLs, then the company needs a proxy server, the employee computer request the network URL is sent through the proxy server (proxy server will check
1. Forward proxy
The forward proxy is located between the original server and the client, and its role is to send requests in place of the client, for example, to protect the client, or to flip the wall (the condition is that the proxy server must not be limited by GFW, currently, most VPs instances outside China are purchased. The process is as follows:
1.
Protocol and proxy, protocol proxy
======================================
Protocols and Proxies
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[Agreement]
@ Protocol
[Role of the Protocol]: Specifies the interface method to be implemented. An agreement that must be followed by the entrusting party and the agent.
Delegate by (nt. delegate = self;) [Note: you can delegate yourself or other classes]
The
Forward proxy is a client and originalServerTo get content from the original server, the client sends a request to the proxy and specifies the target (original server ), then the proxy transfers the request to the original server and returns the obtained content to the client. The client must make some special settings to use the forward
Child Class Child {private parent, parent;Public Parent getParent () {Return this.parent;//access to the instance variable}}Class Parent {private String name;Public String GetName () {Return this.name;//access to the instance variable}public void F () {System.out.println ("Invokeing f ()");//No access to instance variable}}If Many-to-oneThe lazy is set to proxy, and when Child.getparent (). GetName () or child.getparent (). f (), the parentwill be cra
XShell configures the Socket5 proxy and xshellsocket5 proxy
Open the proxy settings panel and click view> Tunneling Pane.In the displayed window, select Forwarding Rules and right-click the blank space: add. In the pop-up Forwarding Rule, select "Dynamic (SOCK54/5)" for Type, and use the default 1080 for Listen Port.Then the browser can use the
Python crawler practice (iii) -------- sogou article (IP proxy pool and user proxy pool settings ---- scrapy ),
In learning the scrapy crawler framework, it will certainly involve setting the IP proxy pool and User-Agent pool to avoid anti-crawling of websites.
In the past two days, I watched a video about sogou's article crawling. I talked about ip
Concept:Static proxy: The source code is generated automatically by the programmer or a specific tool, and then compiled. Before the program runs, the. class file for the proxy classes already exists.Dynamic Agent: When the program is running, it is created dynamically using the reflection mechanism.The dynamic proxy of the JDK is very simple to use, when it has
A forward proxy is a server that is located between the client and the original server (Origin server), in order to obtain content from the original server, the client sends a request to the agent and specifies the target (the original server), and the agent forwards the request to the original server and returns the obtained content to the client. The client must make some special settings to use the forward proxy.Reverse
Squid cache (squid for short) is a popular free software (GNU General Public License) proxy server and Web Cache Server. Squid has a wide range of uses, from cache-related requests as front cache servers of web servers to improving the speed of web servers, to cache the World Wide Web for a group of people to share network resources, domain Name System and other network search, to help network security by filtering traffic, to the LAN through the
AOPThe idea of proxy is Aspect-Oriented. Dynamic proxy technology is added. With AOP proxy, we can add some new businesses without modifying the original business classes. Shows the implementation idea:
The following is a simple example.Code:
1,DogInterface
Public interface dog {public void Info (); Public void run ();}
2,GundogImplementation class
Self-implemented simple AOP (4) Automatic initialization of proxy objects, and aop initialization of proxy objects
The first three articles have completed the core functions of AOP, but the initialization of proxy objects is still a little troublesome. This article will solve this problem.
The Demo snippets are as follows:
Public class HomeController: Controlle
[Original] verify whether the proxy IP is useful, the original proxy ip
///
How to verify whether the proxy IP address is valid
Open IE. Enter www.ip138.com to display your Internet IP address ..Proxy IP Verification
One by one.
Recently, I wanted to help my colleagues brush their online votes, so I wanted to find a software for rotating agents. I didn't expect it to be available online! It's hard to find a few pitiful resources, either fake or virus ....... You can only do it yourself .... Make up for the gaps in the network ......
Now, in the name of Langfang normal 8 class upgrade, I am releasing a software for regular proxy replacement for free here. You can add and impo
In win7, how does one set proxy networking ?, Set proxy networking in win7
How to Set up vpn proxy networking in win7
Step 1: Click the red box icon in the lower right corner of the computer.
Step 2: click "Open Network and sharing center ".
Step 3: click "set new connection or network ".
Step 4: click "connect to workspace ".
Step
This article has a V-type knowledge base to provideUpstream Tomcat {Server 127.0.0.1:82;}Location/{Proxy_pass Http://tomcat;}As configured above, the reverse proxy is accessed using http://test.xxx.com/, but the link in the page becomes:Http://tomcat:82/xxxx.htmlI would like to ask you, this how to configure, in order to make the page inside the link address is http://test.xxx.com/xxxx.htmlWorkaround:Location/{Proxy_pass Http://tomcat;Proxy_set_header
If you need to monitor certain states of the (monitor) class, you need to write a monitoring class and monitor the monitoring class.
But only locally, if remote monitoring is required, use proxy pattern.
Specific methods:
1. The class needs to provide state information and provide some get methods to make the call.
/** * @time July 11, 2014 * * Package proxy; /** * @author C.l.wang * */public class Gum
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