Java中字符串的替换(转)

最近在网上搜集了一些java中字符串替换的方法。

1. /**

* 字符串替换函数

* @param from 要替换的字符

* @param to 要替换成的目标字符

* @param source 要替换的字符串

* @return 替换后的字符串

*/

import java.util.StringTokenizer;

public String str_replace(String from,Stringto,String source) { StringBuffer bf= new StringBuffer("");

StringTokenizerst = new StringTokenizer(source,from,true);

while (st.hasMoreTokens()) {

String tmp = st.nextToken();

if(tmp.equals(from)) {

bf.append(to);

} else {

bf.append(tmp);

}

}

return bf.toString();

}

2. /*

*字符串替换函数,另一种方法的实现

*/

public String str_replace2(String con ,String tag,String rep){ int j=0;

inti=0;

int k=0;

String RETU="";

String temp =con;

inttagc =tag.length();

while(i

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;

}

3.

public static String replace(String strSource, String strFrom, String strTo) { if(strFrom == null || strFrom.equals(""))

return strSource;

String strDest = "";

intintFromLen = strFrom.length();

intintPos;

while((intPos = strSource.indexOf(strFrom)) != -1) {

strDest = strDest + strSource.substring(0,intPos);

strDest = strDest + strTo;

strSource = strSource.substring(intPos + intFromLen);

}

strDest = strDest + strSource;

ret urn strDest;

}

4.高效替换程序。

public static String replace(String strSource, String strFrom, String strTo) { if (strSource == null) {

return null;

}

inti = 0;

if ((i = strSource.indexOf(strFrom, i)) >= 0) {

char[] cSrc = strSource.toCharArray();

char[] cTo = strTo.toCharArray();

intlen = strFrom.length();

StringBufferbuf = new StringBuffer(cSrc.length);

buf.append(cSrc, 0, i).append(cTo);

i += len;

int j = i;

while ((i = strSource.indexOf(strFrom, i)) > 0) {

buf.append(cSrc, j, i - j).append(cTo);

i += len;

j = i;

}

buf.append(cSrc, j, cSrc.length - j);

return buf.toString();

}

return strSource; }