hi_beijing的专栏

public void saveProperties() { try { Properties properties = new Properties(); Properties p = new Properties(); File file = new File("F://test.properties"); p.load(new FileIn...

Date d = new Date(); Calendar ca = Calendar.getInstance(); ca.setTime(d); System.out.println(ca.get(Calendar.SUNDAY)); SimpleDateFormat formate1=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss E...

List有序key和value都能重复Set 无序(除treeSet) key和value都不能重复Map无序(除treeMap) key 必须唯一 value 可以重复//允许重复，并且是有序,允许为空 List list = new ArrayList(); list.add(123); list.add(123); list.add(""); for(i...

String regEx="0(1)(2)"; String str="0123456789012345678901234567890123456789"; Pattern p = Pattern.compile(regEx); Matcher matcher = p.matcher(str); while(matcher.find()){...

json为字符串 String path = "http://www.secn.com.cn?format=json";  URL url = new URL(path);  HttpURLConnection conn = (HttpURLConnection) url.openConnection();  conn.setReadTimeout(5*1000);  conn.setRe...

package com.gakes.common.util;public class PageUtils{ private int page; private int pageTotal; private String url; private int pageSize; public PageUtils(int page, int pageSize, int ...

public static void main(String[] args) throws IOException { try { ZipOutputStream zipOutStream = new ZipOutputStream(new FileOutputStream(new File("E://aa.rar"))); // 创建目录级文件名 ZipE...