http://www.flyne.org/article/693

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
interface Filter {
String doFilter(String str, FilterChain chain);
}
class HtmlFilter implements Filter {
public String doFilter(String msg, FilterChain chain) {
String r = msg;
// 过滤msg中的HTML标记
r = r.replace("<", "<").replace(">", ">");
r = chain.doFilter(r, chain);
return r;
}
}
class SensitiveFilter implements Filter {
public String doFilter(String msg, FilterChain chain) {
String r = msg;
// 过滤敏感词
r = r.replace("敏感", "").replace("被就业", "就业");
r = chain.doFilter(r, chain);
return r;
}
}
class FilterChain implements Filter {
public List<Filter> filters = new ArrayList<Filter>();
public FilterChain addFilter(Filter f) {
filters.add(f);
return this;
}
Iterator it = null;
public String doFilter(String msg, FilterChain chain) {
if (it == null) {
it = filters.iterator();
}
String result = msg;
// 执行filters中的doFilter方法即可
if (it.hasNext()) {
Filter f = (Filter) it.next();
result = (String) f.doFilter(msg, chain);
}
return result;
}
}
class MsgProcessor {
private String msg;
private FilterChain chain;
public MsgProcessor(String msg, FilterChain chain) {
this.msg = msg;
this.chain = chain;
}
public String process() {
return chain.doFilter(msg, chain);
}
}
public class MainClass {
public static void main(String[] args) {
// 需要被过滤的语句
String msg = "被就业了：），敏感信息，<script>";
// 搞一个过过滤链
FilterChain chain = new FilterChain();
chain.addFilter(new HtmlFilter()).addFilter(new SensitiveFilter());
// 实例化处理类
MsgProcessor mp = new MsgProcessor(msg, chain);
String r = mp.process();
System.out.println(r);
}
}

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