责任链(职责链)模式简例[Chain of Responsibility]
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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:
-------------------------------------------------------------------------------------------------------------------
/**
* 责任链
* @author Rick
*
*/
public interface Filter {
void doFilter(Request req, Response res, FilterChain chain);
}
---------------------------------------------------------------------------------------------------------------------
/**
* 主链
* @author Rick
*
*/
public class FilterChain implements Filter {
List<Filter> filterList = new ArrayList<Filter>();
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);
}
}
------------------------------------------------------------------------------------------------------------------------
/**
* 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";
}
}
----------------------------------------------------------------------------------------------------------------------------
/**
* 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";
}
}
-----------------------------------------------------------------------------------------------------------------------------------
/**
* 请求线路
* @author Rick
*
*/
public class Request {
String requestStr;
public String getRequestStr() {
return requestStr;
}
public void setRequestStr(String requestStr) {
this.requestStr = requestStr;
}
}
-------------------------------------------------------------------------------------------------------
/**
* 反馈路线
* @author Rick
*
*/
public class Response {
String responseStr;
public String getResponseStr() {
return responseStr;
}
public void setResponseStr(String responseStr) {
this.responseStr = responseStr;
}
}
-------------------------------------------------------------------------------------------------
/**
* 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 = "<script>下雨天,不嗨森</script>";
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());
}
}
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