JavaSE-32 工具类及其他

日期转换

package com.etc.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/** 日期转换工具类 */
public class DateConvert {

	/** 日期对象转Long类型时间戳 */
	public static Long date2Long(Date date) {
		return date.getTime();
	}

	/** 时间戳转Date日期类型 */
	public static Date long2Date(Long timeStamp) {
		return new Date(timeStamp);
	}

	/** 日期转字符串 */
	public static String date2String(Date date, String pattern) {
		SimpleDateFormat sdf = new SimpleDateFormat(pattern);
		return sdf.format(date);
	}

	/** 字符串转日期 */
	public static Date string2Date(String dateStr, String pattern) {
		// String dateStr="2018-3-15 14:26:00";
		// String pattern="yyyy-MM-dd HH:mm:ss";
		SimpleDateFormat sdf = new SimpleDateFormat(pattern);
		Date date = null;
		try {
			date = sdf.parse(dateStr);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return date;
	}

	/** Long时间戳转日期字符串 */
	public static String long2String(Long timeStamp) {
		Date date = new Date(timeStamp);
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		return sdf.format(date);
	}

	/** 日期字符串转Long时间戳 */
	public static Long string2Long(String dateStr) {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Date date = null;
		try {
			date = sdf.parse(dateStr);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return date.getTime();
	}
}

　　

翻页类

package com.etc.util;

import java.util.List;

/**分页工具类*/
public class Page<T> {
	 // 总页数
    private int totalPageCount = 1;
    // 页面大小，即每页显示记录数
    private int pageSize = 0;
    // 记录总数
    private int totalCount = 0;
    // 当前页号
    private int currPageNo = 1;
    // 每页数据集合
    private List<T> list;
 
    public List<T> getList() {
        return list;
    }
 
    public void setList(List<T> list) {
        this.list = list;
    }
 
    public int getCurrPageNo() {
        if (totalPageCount == 0)
            return 0;
        return currPageNo;
    }
 
    public void setCurrPageNo(int currPageNo) {
        if (this.currPageNo > 0)
            this.currPageNo = currPageNo;
    }
 
    public int getTotalPageCount() {
        return totalPageCount;
    }
 
    public void setTotalPageCount(int totalPageCount) {
        this.totalPageCount = totalPageCount;
    }
 
    public int getPageSize() {
        return pageSize;
    }
 
    public void setPageSize(int pageSize) {
        if (pageSize > 0)
            this.pageSize = pageSize;
    }
 
    public int getTotalCount() {
        return totalCount;
    }
 
    public void setTotalCount(int totalCount) {
        if (totalCount > 0) {
            this.totalCount = totalCount;
            // 计算总页数
            totalPageCount = this.totalCount % pageSize == 0 ? (this.totalCount / pageSize)
                    : this.totalCount / pageSize + 1;
        }
    }
}

　　

读取配置文件

文件位置：srcdatabase.properties

package com.etc.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/** 读取配置文件工具类 */
public class ConfigManager {
	private static ConfigManager configManager;
	private static Properties properties;

	// 构造工具类时，读取配置文件
	private ConfigManager() {
		String configFile = "database.properties";
		properties=new Properties();
		InputStream in=ConfigManager.class.getClassLoader().getResourceAsStream(configFile);
		try {
			properties.load(in);
			in.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	//单例：获取实例
	public static ConfigManager getInstance(){
		if(configManager==null){
			configManager=new ConfigManager();
		}
		return configManager;
	}
	
	//通过key获取value
	public String getString(String key){
		return properties.getProperty(key);
	}

}