public class Main {
public static void main(String[] args) {
String msg = "Java编程思想 :). 大学生就业 ，Java实习";
msgProcessor process = new msgProcessor();
process.setMsg(msg);
FilterChain filter = new FilterChain();
filter.addFilter(new FindAndReplaceFilter()).addFilter(
new ReplaceFilter());
process.setFc(filter);
System.out.println(process.getMsg());
}
}

public interface Filter {
public String doFilter(String str);
}

import java.util.ArrayList;
import java.util.List;

public class FilterChain {
List filters=new ArrayList();

public FilterChain addFilter(Filter filter){
filters.add(filter);
return this;
}
public String doFilter(String msg){
for(Filter f : filters){
msg=f.doFilter(msg);
}
return msg;
}
}

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class FindAndReplaceFilter implements Filter {
@Override
public String doFilter(String str) {
// 第一步首先定义一个应被过滤的字符数组即正则表达式
String[] msg = new String[] { "大学生","就业","呵呵" };
// 第二步将正则表达式编译到模式中
Pattern p = null;
for (String s : msg) {
p = Pattern.compile(s);
// 第三步 创建匹配给定输入与此模式的匹配器
Matcher m = p.matcher(str);
// 第四步方法扫描输入序列以查找与该模式匹配
if (m.find())
str = str.replace(s," ");
}
return str;
}

}

public class ReplaceFilter implements Filter {
@Override
public String doFilter(String str) {
str=str.replace("<","[");
return str;
}
}

public class msgProcessor { private String msg; FilterChain fc; public FilterChain getFc() { return fc; } public void setFc(FilterChain fc) { this.fc = fc; } public String getMsg() { return fc.doFilter(msg); } public void setMsg(String msg) { this.msg=msg; } }