java设计模式（二）：2.1责任链（简单一条链）

例子：实现一个简单的过滤器

工程目录结构与执行原理：





 

1.Filter.java过滤器接口类

package filter;

public interface Filter {
public String doFilter(String str);
}

 

2.Filter1.java过滤器实现类

package filter.impl;

import filter.Filter;

public class Filter1 implements Filter{

@Override
public String doFilter(String str) {
str += "Filter1,";
return str;
}

}

 

3.Filter2.java过滤器实现类

package filter.impl;

import filter.Filter;

public class Filter2 implements Filter{

@Override
public String doFilter(String str) {
str += "Filter2,";
return str;
}

}

 

4.Processor.java过滤器执行类

import filter.impl.Filter1;
import filter.impl.Filter2;

public class Processor implements Filter{

Filter[] filters = {new Filter1(),new Filter2()};

public String doFilter(String str){
for(Filter f:filters){
str = f.doFilter(str);
}
return str;
}
}

5.Main.java程序主方法

import filter.Processor;

public class Main {
public static void main(String[] args) {
String str = "123,mxm,456,";
Processor p = new Processor();
str = p.doFilter(str);
System.out.println(str);
}
}

程序打印结果：

123,mxm,456,Filter1,Filter2,