apache的replace,trim方法 StringUtils.replace(),StringUtils.trimWhitespace() java原生

最新推荐文章于 2025-08-30 11:21:56 发布

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本文通过实验对比了Java中使用Apache Commons Lang库的StringUtils方法与原生String方法进行replace及trim操作的性能差异。结果显示，在大量重复操作下，Apache StringUtils在replace操作上表现更优，但在trim操作上原生String方法更快。

apache的replace,trim方法 StringUtils.replace(),StringUtils.trimWhitespace()
java原生的replace,trim方法之间性能的巨大差别。

    Java代码   
    
  
public class App   
{  
    final static String teString = "    555555599999999999999999aaa sss ssaaaaaaaaaaaaaatasdtatastasrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa      ";   
    public static void main( String[] args )  
    {  
        int t = 100000;  
         long start1 = System.nanoTime();  
         long stringUtilsReplaceTime = 0;  
         long stringUtilsTrimTime = 0;  
         long stringReplaceTime = 0;  
         long stringTrimTime = 0;  
         for(int i= 0;i<t;i++){  
           StringUtils.replace(teString,"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa","b");  
         }  
         stringUtilsReplaceTime= System.nanoTime()-start1;  
           
           
          start1 = System.nanoTime();  
         for(int i= 0;i<t;i++){  
           teString.replace("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", "b");  
         }  
           
         stringReplaceTime = System.nanoTime()-start1;  
  
        start1 = System.nanoTime();  
       for(int i= 0;i<t;i++){  
           teString.trim();  
       }  
       stringTrimTime = System.nanoTime()-start1;  
         
         
        start1 = System.nanoTime();  
       for(int i= 0;i<t;i++){  
            
           StringUtils.trimWhitespace(teString);  
       }  
         
       stringUtilsTrimTime = System.nanoTime()-start1;  
         
       System.out.println("stringUtilsReplaceTime:"+stringUtilsReplaceTime);  
       System.out.println("stringReplaceTime     :"+stringReplaceTime);  
       System.out.println("stringUtilsTrimTime   :"+stringUtilsTrimTime);  
       System.out.println("stringTrimTime        :"+stringTrimTime);  
    }  
   
}  

输出结果为：
stringUtilsReplaceTime:293389595
stringReplaceTime     :1019421816
stringUtilsTrimTime   :176730378
stringTrimTime        :3888271

    Java代码   
    
  
public class App   
{  
    final static String teString = "    555555599999999999999999aaa sss ssaaaaaaaaaaaaaatasdtatastasrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa      ";   
    public static void main( String[] args )  
    {  
        int t = 100;  
         long start1 = System.nanoTime();  
         long stringUtilsReplaceTime = 0;  
         long stringUtilsTrimTime = 0;  
         long stringReplaceTime = 0;  
         long stringTrimTime = 0;  
         for(int i= 0;i<t;i++){  
           StringUtils.replace(teString,"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa","b");  
         }  
         stringUtilsReplaceTime= System.nanoTime()-start1;  
           
           
          start1 = System.nanoTime();  
         for(int i= 0;i<t;i++){  
           teString.replace("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", "b");  
         }  
           
         stringReplaceTime = System.nanoTime()-start1;  
  
        start1 = System.nanoTime();  
       for(int i= 0;i<t;i++){  
           teString.trim();  
       }  
       stringTrimTime = System.nanoTime()-start1;  
         
         
        start1 = System.nanoTime();  
       for(int i= 0;i<t;i++){  
            
           StringUtils.trimWhitespace(teString);  
       }  
         
       stringUtilsTrimTime = System.nanoTime()-start1;  
         
       System.out.println("stringUtilsReplaceTime:"+stringUtilsReplaceTime);  
       System.out.println("stringReplaceTime     :"+stringReplaceTime);  
       System.out.println("stringUtilsTrimTime   :"+stringUtilsTrimTime);  
       System.out.println("stringTrimTime        :"+stringTrimTime);  
    }  
   
}  