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：