责任链或过滤器模式2-使用过滤链

拼搏现实的明天。 2022-06-10 05:11 170阅读 0赞

//过滤器接口
    public interface Filter {
    	public String doFilter(String str);
    }

//HTML的过滤器
    public class HTMLFilter implements Filter{
    	@Override
    	public String doFilter(String str) {
    		if(str==null)return "";
    		str=str.replace("<", "[");
    		str=str.replace(">", "]");
    		return str;
    	}
    }

//敏感词的过滤器
    public class SensitiveFilter implements Filter{
    	@Override
    	public String doFilter(String str) {
    		if(str==null)return "";
    		str=str.replace("敏感", "mingan");
    		return str;
    	}
    }

//过滤链,把要使用的过滤器放在集合当中进行依次处理
    public class FilterChain implements Filter{
    	private List<Filter> list=new ArrayList<Filter>();
    	public FilterChain addfilter(Filter filter){
    		list.add(filter);
    		return this;
    	}
    	public String doFilter(String str){
    		System.out.println("#################");
    		if(str==null)return "";
    		for(Filter filter : list){
    			str=filter.doFilter(str);
    		}
    		return str;
    	}
    }

//字符串过滤的处理类
    public class Process {
    	private String str;
    	private FilterChain filterchain;
    	//字符串过滤的处理方法
    	public String process(){
    		if(filterchain==null) return str;
    		//使用在client类中添加的过滤器在过滤链进行处理
    		return filterchain.doFilter(str);
    	}
    	
    	public String getStr() {
    		return str;
    	}
    	public void setStr(String str) {
    		this.str = str;
    	}
    	public FilterChain getFilterchain() {
    		return filterchain;
    	}
    
    	public void setFilterchain(FilterChain filterchain) {
    		this.filterchain = filterchain;
    	}
    }

public class Client {
    	public static void main(String[] args) {
    		String str="这是我的一个敏感链接<a>优酷</a>";
    		FilterChain  fc=new FilterChain();
    //		fc.addfilter(new HTMLFilter()).addfilter(new SensitiveFilter());
    		fc.addfilter(new HTMLFilter());
    		
    		FilterChain fc1=new FilterChain();
    		fc1.addfilter(new SensitiveFilter());
    		fc.addfilter(fc1);//在一个过滤链上面再加上一个过滤链
    		
    		Process pro=new Process();
    		pro.setStr(str);
    		pro.setFilterchain(fc);
    		str=pro.process();
    		System.out.println(str);
    	}
    	/**
    	 * 运行结果:
    	 * #################
    	 * #################
    	 * 这是我的一个mingan链接[a]优酷[/a]
    	 */
    }