Guava String_chugaiceng3557的博客

package GuavaString;

import com.google.common.base.*;
import com.google.common.collect.Lists;
import org.apache.commons.lang.CharSet;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by ZhaoYun on 2016/5/11.
 * 字符串的处理 分割 连接  填充
 */
public class GuavaString {

    private static final Joiner joiner = Joiner.on(",").skipNulls();//skipNulls 这样可以过滤null值  否则遇到null时会报 NullPointerException

    private static final Splitter spl = Splitter.on(",").omitEmptyStrings().trimResults().limit(10);//按单个字符串拆分 omitEmptyStrings会忽略空字符串
    // trimResults移除结果字符串的前后空白  limit 限制分割的数量


    public static void main(String[] args){

        //String 连接器 Joiner
        String[] strings = new String[]{"a","b","c","d",null};
        String afterJoin = joiner.join(strings);
        System.out.println("String[] : " + afterJoin);// System.out.println的快捷键：sout 然后按tab 建

        List<String> list = new ArrayList<String>();
        list.add("a");
        list.add("b");
        list.add("");
        list.add("c");
        System.out.println("list :" + joiner.join(list));

        //String 拆分器 Splitter
        list = Lists.newArrayList(spl.split(afterJoin));
        for(String str : list){
            System.out.println(str);
        }

        //String 匹配器 CharMatcher
        String string = "0123456789SuccessControl";
        string = CharMatcher.JAVA_ISO_CONTROL.removeFrom(string); //移除control
        string = CharMatcher.DIGIT.retainFrom(string);//只保留数字
        string = CharMatcher.DIGIT.retainFrom(string);//获取所有的数字
        string = CharMatcher.WHITESPACE.trimAndCollapseFrom(string, ' ');//去除两端的空格;并把中间的连续空格替换成单个空格
        string = CharMatcher.JAVA_DIGIT.replaceFrom(string, "*");//用*号替换所有数字
        string = CharMatcher.JAVA_DIGIT.or(CharMatcher.JAVA_LOWER_CASE).retainFrom(string);// 只保留数字和小写字母
        string = CharMatcher.JAVA_UPPER_CASE.retainFrom(string);//获取所有的大写字母
        string = CharMatcher.SINGLE_WIDTH.retainFrom(string);//获取所有单字节长度的符号
        System.out.println(string);

        // Charsets 字符集 提供六种字符集常量引用

        // CaseFormat 大小写转换器
    }

}
package GuavaString;

import com.google.com