利用正则表达式根据自己的要求替换

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;

}

}