check.java

采用jsp+servlet+javabean

package guestbook;

import java.util.regex.*;

public class Check {
  //替换字符
  public static String insteadCode(String str,String regEx,String code){
    Pattern p=Pattern.compile(regEx);
    Matcher m=p.matcher(str);
    String s=m.replaceAll(code);
    return s;
  }
  //检查正则匹配
  public static boolean checkCode(String regEx,String str){
    Pattern p=Pattern.compile(regEx);
    Matcher m=p.matcher(str);
    return m.find();
  }
  //把内容替换成html格式，同时过滤掉html的标签
  public static String toHTML(String sourcestr){
    String targetstr=insteadCode(sourcestr,">",">");
    targetstr=insteadCode(targetstr,"<","&lt;");
    targetstr=insteadCode(targetstr,"\n","<br>");
    targetstr=insteadCode(targetstr," ","&nbsp;");
    return targetstr;
  }
}