责任链(职责链)模式简例[Chain of Responsibility]

本例代码不单只可以实现一条责任链,还可以将一条责任链当做一个责任加载到主链上 Code:

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/**
 * 责任链
 * @author Rick
 *
 */
public interface Filter {
void doFilter(Request req, Response res, FilterChain chain);
}

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/**
 * 主链
 * @author Rick
 *
 */
public class FilterChain implements Filter {
List filterList = new ArrayList();
int index = 0;

public FilterChain addFilter(Filter filter) {
this.filterList.add(filter);
return this;
}

@Override
public void doFilter(Request req, Response res, FilterChain chain) {
if(index == filterList.size())
return;

Filter filter = filterList.get(index);
index++;

filter.doFilter(req, res, chain);
}


}

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/**
 * 职责1
 * @author Administrator
 *
 */
public class HTMLFilter implements Filter {


@Override
public void doFilter(Request req, Response res, FilterChain chain) {
req.requestStr = req.requestStr.replace("<", "[").replace(">", "]") + "---HTMLFilter";
chain.doFilter(req, res, chain);
res.responseStr += "---HTMLFilter";
}


}

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/**
 * 职责2
 * @author Rick
 *
 */
public class SensitiveFilter implements Filter {


@Override
public void doFilter(Request req, Response res, FilterChain chain) {
req.requestStr = req.requestStr.replace("下雨", "晴天").replace("不嗨森", "哈哈哈哈！") + "---SensitiveFilter";
chain.doFilter(req, res, chain);
res.responseStr += "---SensitiveFilter";
}

}

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/**
 * 请求线路
 * @author Rick
 *
 */
public class Request {
String requestStr;

public String getRequestStr() {
return requestStr;
}


public void setRequestStr(String requestStr) {
this.requestStr = requestStr;
}


}

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/**
 * 反馈路线
 * @author Rick
 *
 */
public class Response {
String responseStr;


public String getResponseStr() {
return responseStr;
}


public void setResponseStr(String responseStr) {
this.responseStr = responseStr;
}


}

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/**
 * 责任链模式/职责链模式
 * Chain of responsibility！！！
 * @author Rick
 *
 */
public class Main {
public static void main(String[] args) {
String msg = "";
Request req = new Request();
req.setRequestStr(msg);
Response res = new Response();
res.setResponseStr("神一样的回复！");

FilterChain fc = new FilterChain();
fc.addFilter(new HTMLFilter()).addFilter(new SensitiveFilter());

fc.doFilter(req, res, fc);
System.out.println(req.getRequestStr());
System.out.println(res.getResponseStr());
}
}

起航！TAMAO！