Spring Utils工具类常用方法实例
Spring提供的工具类，主要用于框架内部使用，这个类提供了一些简单的方法，并且提供了易于使用的方法在分割字符串，如CSV字符串，以及集合和数组。
StringUtils提供常用的方法如下：
判断对象对象是否为null或者空字符串
publicstaticbooleanisEmpty(@NullableObjectstr){
return(str==null||"".equals(str));
}
判断给的序列是否为空或者length为0
publicstaticbooleanhasLength(@NullableCharSequencestr){
return(str!=null&&str.length()>0);
}
publicstaticbooleanhasLength(@NullableStringstr){
return(str!=null&&!str.isEmpty());
}
判断字符串是否以某个字符串开头
publicstaticbooleanstartsWithIgnoreCase(@NullableStringstr,@NullableStringprefix){
return(str!=null&&prefix!=null&&str.length()>=prefix.length()&&
str.regionMatches(true,0,prefix,0,prefix.length()));
}
判断字符串是否以某个字符串结尾
publicstaticbooleanendsWithIgnoreCase(@NullableStringstr,@NullableStringsuffix){
return(str!=null&&suffix!=null&&str.length()>=suffix.length()&&
str.regionMatches(true,str.length()-suffix.length(),suffix,0,suffix.length()));
}
用另一个字符串替换字符串中出现的所有子字符串
publicstaticStringreplace(StringinString,StringoldPattern,@NullableStringnewPattern){
if(!hasLength(inString)||!hasLength(oldPattern)||newPattern==null){
returninString;
}
//oldPattern字符串第一次出现的位置
intindex=inString.indexOf(oldPattern);
if(index==-1){
//nooccurrence->canreturninputas-is
returninString;
}
//字符串长度
intcapacity=inString.length();
if(newPattern.length()>oldPattern.length()){
capacity+=16;
}
StringBuildersb=newStringBuilder(capacity);
intpos=0;//ourpositionintheoldstring
intpatLen=oldPattern.length();
while(index>=0){
sb.append(inString,pos,index);
sb.append(newPattern);
pos=index+patLen;
index=inString.indexOf(oldPattern,pos);
}
//appendanycharacterstotherightofamatch
sb.append(inString,pos,inString.length());
returnsb.toString();
}
根据给定的路径规范化路径
publicstaticStringcleanPath(Stringpath){
if(!hasLength(path)){
returnpath;
}
//用新字符串替换旧字符串
StringpathToUse=replace(path,WINDOWS_FOLDER_SEPARATOR,FOLDER_SEPARATOR);
//Shortcutifthereisnoworktodo
if(pathToUse.indexOf('.')==-1){
returnpathToUse;
}
//Stripprefixfrompathtoanalyze,tonottreatitaspartofthe
//firstpathelement.Thisisnecessarytocorrectlyparsepathslike
//"file:core/../core/io/Resource.class",wherethe".."shouldjust
//stripthefirst"core"directorywhilekeepingthe"file:"prefix.
intprefixIndex=pathToUse.indexOf(':');
Stringprefix="";
if(prefixIndex!=-1){
prefix=pathToUse.substring(0,prefixIndex+1);
if(prefix.contains(FOLDER_SEPARATOR)){
prefix="";
}
else{
pathToUse=pathToUse.substring(prefixIndex+1);
}
}
if(pathToUse.startsWith(FOLDER_SEPARATOR)){
prefix=prefix+FOLDER_SEPARATOR;
pathToUse=pathToUse.substring(1);
}
String[]pathArray=delimitedListToStringArray(pathToUse,FOLDER_SEPARATOR);
LinkedListpathElements=newLinkedList<>();
inttops=0;
for(inti=pathArray.length-1;i>=0;i--){
Stringelement=pathArray[i];
if(CURRENT_PATH.equals(element)){
//Pointstocurrentdirectory-dropit.
}
elseif(TOP_PATH.equals(element)){
//Registeringtoppathfound.
tops++;
}
else{
if(tops>0){
//Mergingpathelementwithelementcorrespondingtotoppath.
tops--;
}
else{
//Normalpathelementfound.
pathElements.add(0,element);
}
}
}
//Remainingtoppathsneedtoberetained.
for(inti=0;i
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