java字符串操作扩充：灵活截取字符串

亦凉 2023-07-09 09:28 8阅读 0赞

java字符串操作扩充：灵活截取字符串  
public class StringUtil \{

static int varlen1;  
static int varlen2;

static String varstr1;  
static String varstr2;  
static String varstr3;  
public static String indexOf(String sourceStr,String indexStr,int indexNum)\{  
/\*\*

*  原始字符串:sourceStr
 *  索引字符串:indexStr
 *  固定字符串截取后索引次数的indexNum
 *  
 *  indexOf(“ws++rq++sl++dl”,"++",4)
 *  结果:dl  
    \*/  
    varlen1 = sourceStr.length();  
    varlen2 = indexStr.length();

int i=0;//字符串下标  
int n=0;//某字符串在指定字符串中的个数  
int m=0;  
int x=0;  
while (i< varlen1)\{  
varstr1 = sourceStr.substring(i, i);//substr(sourceStr,i,1);  
varstr2 = indexStr.substring(1,1);//获取指定用于截串的字符串的第一个字符

if(varstr1.equals(varstr2)){
         if(i+varlen2<=varlen1){//判断字符下标
         if(indexStr.equals(sourceStr.substring(i, i+varlen2))){
             n++;
             i=i+varlen2;
             }
         }
         }
         i++;

x=n;

if(indexNum <= 0)\{  
return “”;  
\}

if(n==0)\{  
return sourceStr;  
\}

if(indexNum1)\{  
i=0;  
n=0;  
while(i<varlen1)\{  
varstr1 = sourceStr.substring(i, i);  
varstr2 = indexStr.substring(1, 1);  
if(nullvarstr3)\{  
varstr3=sourceStr.substring(i, i);  
\}else  
varstr3.concat(sourceStr.substring(i, i));  
if(varstr1.equals(varstr2))\{  
if(indexStr.equals(sourceStr.substring(i, i+varlen2)))\{  
n++;  
if(i0&&n1)\{  
m=varlen2;  
\}else\{  
return sourceStr.substring(m, i);  
\}  
\}  
\}  
i++;  
\}  
\}

if(indexNum<=n+1)\{  
i=0;  
n=0;  
int c=0;  
while(i<varlen1)\{  
varstr1 = sourceStr.substring(i, i);  
varstr2 = indexStr.substring(1, 1);  
if(varstr1.equals(varstr2))\{  
if(indexStr.equals(sourceStr.substring(i, i+varlen2)))\{  
n++;  
if(n+1indexNum)\{  
m=i+varlen2;  
c=n;//存储指字符串出现的次数  
\}  
if(n-1c&&c!=0)\{  
//当上一个条件满足时，下次出现时返回指定索引的字符串  
return sourceStr.substring(m, i);  
\}  
i=i+varlen2;  
\}else  
i++;  
\}else  
i++;

\}  
\}  
//获取截取后的最后一个字符串  
return sourceStr.substring(sourceStr.lastIndexOf(indexStr)+indexStr.length(),sourceStr.length());  
\}  
public static void main(String\[\] args) \{  
System.out.println(indexOf(“ws++rq++sl++dl”,"++",3));  
\}  
\}  
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