java去掉String里面的空格、换行符等

 package com.ynet.utils;

 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 /**
  * Created by Arya on 2017/11/3 0003.
  */
 public class StringUtil {
     //去除所有空格
     public static String replaceAllBlank(String str) {
         String s = "";
         if (str!=null) {
             Pattern p = Pattern.compile("\\s*|\t|\r|\n");
             /*\n 回车(\u000a)
             \t 水平制表符(\u0009)
             \s 空格(\u0008)
             \r 换行(\u000d)*/
             Matcher m = p.matcher(str);
             s = m.replaceAll("");
         }
         return s;
     }
     //去除所有空格，留下一个
     public static String replaceBlankLeaveOne(String str) {
         String s = "";
         if (str!=null) {
             Pattern p = Pattern.compile("\\s{2,}|\t|\r|\n");
             Matcher m = p.matcher(str);
             s = m.replaceAll(" ");
         }
         return s;
     }

     public static void main(String[] args) {
         System.out.println(StringUtil.replaceAllBlank("just    do     it!"));
         System.out.println(StringUtil.replaceBlankLeaveOne("just    do     it!"));
     }

 }

运行效果：