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replaceAll函数

摘要: replaceAll函数

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请看以前的html编码函数:

public class HtmlEncode{

        String re;

        public String replace(String con,String tag,String rep){

           int j=0;

           int i=0;

           int k=0;

           String RETU="";

           String temp=con;

           int tagc=tag.length();

           while(i< con.length()){

             if(con.substring(i).startsWith(tag)){

                 temp=con.substring(j,i)+rep;

                 RETU+=temp;

                i+=tagc;

                j=i;

              }else{

                  i+=1;

              }

            }

          RETU+=con.substring(j);

      return RETU;

   }

public String htmlEncode(String s){
re=replace(s,"<","<");
re=replace(re,">",">");
re=replace(re,"\n","
");
re=replace(re," "," ");
re=replace(re,"'","&#39");
return re;
}

//下面是使用的例子:

public static void main(String[] args){
String s="<body>'home' cwb</body>";
HtmlEncode he=new HtmlEncode();
System.out.println(he.htmlEncode(s));
}
}

在jdk1.4以后,由于引进了正则表达式,在String类中新增了 public String replaceAll(String regex, String replacement)方法。
像上面的问题就非常容易：
public class Test{
public static void main(String[] args){
String s="<body>'home' cwb</body>";
System.out.println(s.replaceAll("<","&lt"));
}
}

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