java-String常用操作总结

1，内容替换

import org.apache.commons.lang.text.StrSubstitutor;

public void test01() {
     String str="你好，我是${name}";
     Map<String, String> map = new HashMap();
     map.put("name","周杰伦");
     StrSubstitutor strSubstitutor = new StrSubstitutor(map);
     String result=strSubstitutor.replace(str);
     System.out.println(result);
}

2，List转用逗号隔开字符串

import org.apache.commons.lang.StringUtils;

public void test02() {
	List<String> strList= Arrays.asList("A","B","C");
    String result = StringUtils.join(strList, ",");
    System.out.println(result );
}

3，从txt文件中按行读取字符串

public void test03() {
        File file = new File("D:\\aa.txt");
        BufferedReader reader;
        String temp;
        try {
            reader = new BufferedReader(new FileReader(file));
            while ((temp = reader.readLine()) != null) {
                System.out.println(temp);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }