标签：lte size closed 文章 自己 sys 看不见 his requests
简单定义请求类Request(封装一个字符串)
public class Request { String requestStr; public String getRequestStr() { return requestStr; } public void setRequestStr(String requestStr) { this.requestStr = requestStr; } }
简单定义响应类Response
public class Response { String responseStr; public String getResponseStr() { return responseStr; } public void setResponseStr(String responseStr) { this.responseStr = responseStr; } }
至于为什么接收FilterChain(是为了下面filter里面能够调用FilterChain的doFilter()方法)
定义Filter接口
把Request对象和Response对象交给处理器Filter:处理器既能处理Request对象 也能处理Response对象
public interface Filter { void doFilter(Request request, Response response, FilterChain chain); }
定义两个Filter实现类
public class HTMLFilter implements Filter { @Override public void doFilter(Request request, Response response, FilterChain chain) { //process the html tag <> request.requestStr = request.requestStr.replace(‘<‘, ‘[‘) .replace(‘>‘, ‘]‘) + "---HTMLFilter()"; chain.doFilter(request, response, chain); response.responseStr += "---HTMLFilter()"; } }
public class SesitiveFilter implements Filter { @Override public void doFilter(Request request, Response response, FilterChain chain) { request.requestStr = request.requestStr.replace("被就业", "就业") .replace("敏感", "") + "---SesitiveFilter()"; chain.doFilter(request, response, chain); response.responseStr += "---SesitiveFilter()"; } }
public class FilterChain implements Filter { List<Filter> filters = new ArrayList<Filter>(); int index = 0; public FilterChain addFilter(Filter f) { this.filters.add(f); return this; } @Override public void doFilter(Request request, Response response, FilterChain chain) { if(index == filters.size()) return ; Filter f = filters.get(index); index ++; f.doFilter(request, response, chain); } }
public class Main { /** * @param args */ public static void main(String[] args) { String msg = "大家好:)，<script>，敏感，被就业，网络授课没感觉，因为看不见大家伙儿"; Request request = new Request(); request.setRequestStr(msg); Response response = new Response(); response.setResponseStr("response"); FilterChain fc = new FilterChain(); fc.addFilter(new HTMLFilter()) .addFilter(new SesitiveFilter()) ; fc.doFilter(request, response, fc); System.out.println(request.getRequestStr()); System.out.println(response.getResponseStr()); } }
以上代码特点是 Request的处理是正序 Response的处理时倒序:
方便大家看清步骤:这是断点执行顺序
Filter里面调用了filterChain的doFilter方法
FilterChain里面调用了filter的doFilter方法
标签：lte size closed 文章 自己 sys 看不见 his requests
原文地址：https://www.cnblogs.com/ssskkk/p/11586774.html
