Filter Code Pattern

最新推荐文章于 2026-01-03 01:53:35 发布

原创最新推荐文章于 2026-01-03 01:53:35 发布 · 164 阅读

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文章标签：

#java #mybatis #spring

本文介绍了一种过滤器模式的实现方式，定义了Filter接口及其实现类FilterImpl，并通过FilterChain来串联多个过滤器，实现了请求处理过程中的前置和后置操作。

public interface Filter {
    void doFilter(String data,FilterChain chain);
}

public interface BaseFilter extends Filter {
    void init();
}

public class FilterChain implements BaseFilter {

    private Iterator<BaseFilter> baseFilterIterator;

    public FilterChain(BaseFilter... filters) {
        this.baseFilterIterator = Arrays.asList(filters).iterator();
        init();
    }

    @Override
    public void init() {
        baseFilterIterator.forEachRemaining(BaseFilter::init);
    }

    @Override
    public void doFilter(String data,FilterChain chain) {
        if (baseFilterIterator.hasNext()) {
            baseFilterIterator.next().doFilter(data,chain);
        }
    }
    
}

public class FilterImpl implements BaseFilter{
    @Override
    public void init() {
        System.out.println("filter initialize");
    }

    @Override
    public void doFilter(String data, FilterChain chain) {
        System.out.println("filter work...");
        chain.doFilter(data, chain);
    }
}