Java 随笔记
http://blog.csdn.net/hfhwfw/article/details/5544408
package cn.com;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class Base64Test
{
public static void main(String[] args)
{
String strImg = GetImageStr();
System.out.println(strImg);
GenerateImage(strImg);
}
//图片转化成base64字符串
public static String GetImageStr()
{//将图片文件转化为字节数组字符串，并对其进行Base64编码处理
String imgFile = "d://test.jpg";//待处理的图片
InputStream in = null;
byte[] data = null;
//读取图片字节数组
try
{
in = new FileInputStream(imgFile);
data = new byte[in.available()];
in.read(data);
in.close();
}
catch (IOException e)
{
e.printStackTrace();
}
//对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);//返回Base64编码过的字节数组字符串
}
//base64字符串转化成图片
public static boolean GenerateImage(String imgStr)
{ //对字节数组字符串进行Base64解码并生成图片
if (imgStr == null) //图像数据为空
return false;
BASE64Decoder decoder = new BASE64Decoder();
try
{
//Base64解码
byte[] b = decoder.decodeBuffer(imgStr);
//如果不是对图片的质量有硬性的要求，不建议使用这种方式去异常
for(int i=0;i<b.length;++i) {
if (b[i] < 0) {
b[i] += 256;
}
}
//生成jpeg图片
String imgFilePath = "d://222.jpg";//新生成的图片
OutputStream out = new FileOutputStream(imgFilePath);
out.write(b);
out.flush();
out.close();
return true;
}
catch (Exception e)
{
return false;
}
}
//计算距离今天结束还有多少秒
Calendar todayEnd = Calendar.getInstance();
long nowTime = todayEnd.getTime().getTime()/1000;
System.out.println(todayEnd.getTime().getTime()/1000);
todayEnd.set(Calendar.HOUR_OF_DAY, 24);
todayEnd.set(Calendar.MINUTE, 0);
todayEnd.set(Calendar.SECOND, 0);
todayEnd.set(Calendar.MILLISECOND, 0);
long diff = todayEnd.getTime().getTime()/1000 - nowTime;
参考文章 http://blog.csdn.net/f1024042400/article/details/50826374
mybatis 保存数据后返回主键的方法 useGeneratedKeys="true" keyProperty="userId"
SELECT LAST_INSERT_ID() AS ID
