责任链模式

责任链模式可以让一个对象经过一个链进行处理，这个责任可以动态生成，可以不写在代码中。

生成被过滤的对象

package com.test.protect;

public class Message {

	private String content;

	private String telnum;

	public Message(String content, String telnum) {
		super();
		this.content = content;
		this.telnum = telnum;
	}

	public String getContent() {
		return content;
	}

	public String getTelnum() {
		return telnum;
	}

}

 过滤类的共同抽象类

package com.test.protect;

abstract class MsgFilter {

	protected MsgFilter nextFilter;

	protected abstract boolean execute(Message msg);

	public void handleMsg(Message msg) {

		boolean over = execute(msg);

		if (!over) {

			if (nextFilter != null)
				nextFilter.handleMsg(msg);
		}
	}
}

 

内容合法性测试类

package com.test.protect;

public class WordFilter extends MsgFilter {
	
	public WordFilter (MsgFilter nextFilter){
		this.nextFilter = nextFilter;
	}

	@Override
	public boolean execute(Message msg) {

		if (msg.getContent().indexOf("盗版光盘") >= 0) {
			System.out.println(msg.getContent() + ",没有通过关键词过滤");
			return true;
		}
		System.out.println(msg.getContent() + ",通过关键词过滤");
		return false;
	}

}

 

长度测试类

package com.test.protect;

public class LengthFilter extends MsgFilter {

	public LengthFilter(MsgFilter nextFilter) {
		this.nextFilter = nextFilter;
	}

	@Override
	protected boolean execute(Message msg) {

		if ((msg.getContent()).length() > 14) {
			System.out.println(msg.getContent() + ",没有通过短信长度测试");
			return true;
		} else {
			System.out.println(msg.getContent() + ",通过短信长度测试");
			return false;
		}
	}

}

  

 测试主类

package com.test.protect;

public class testProChain {

	public static void main(String[] args) {

		Message msg1 = new Message("赵红伟赵红伟赵红伟赵红伟赵红伟赵红伟","13456785434");
		MsgFilter msgfilters = new WordFilter(new LengthFilter(null));
		msgfilters.handleMsg(msg1);
	}

}