本帖最后由 逆风TO 于 2019-12-4 10:50 编辑
1.JSONArray数组如何循环遍历出来
[Java] 纯文本查看 复制代码 package xxx;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class Test {
public static void main(String[] args) {
/*author:命运的信徒
* date:2019/5/18
*/
String str ="[{'otitle':'会','source':'7'},{'otitle':'不会','source':'3'}]";
//1.把字符串类型的json数组对象转化JSONArray
JSONArray json=JSONArray.fromObject(str);
//2、循环遍历这个数组
for(int i=0;i<json.size();i++){
//3、把里面的对象转化为JSONObject
JSONObject job = json.getJSONObject(i);
// 4、把里面想要的参数一个个用.属性名的方式获取到
System.out.println(job.get("otitle")+":"+job.get("source")) ;
}
}
}
可参考https://blog.csdn.net/qq_37591637/article/details/90319229
2.生成UNIX时间戳(精度:秒)
[Java] 纯文本查看 复制代码 public class Test {
public static void main(String[] args) {
//生成随机时间
long offset = Timestamp.valueOf("2012-01-01 00:00:00").getTime();
long end = Timestamp.valueOf("2013-01-01 00:00:00").getTime();
long diff = end - offset + 1;
Timestamp rand = new Timestamp(offset + (long)(Math.random() * diff));
System.out.println(rand);
//下面两个是一样的结果,都是当前时间(UNIX时间戳)
System.out.println(System.currentTimeMillis() / 1000);
System.out.println(Calendar.getInstance().getTimeInMillis() / 1000);
}
}
3.随机生成时间
[AppleScript] 纯文本查看 复制代码 Random rand = new Random();
SimpleDateFormat format = new SimpleDateFormat( "yyyy-MM-dd ");
Calendar cal = Calendar.getInstance();
cal.set(1900, 0, 1);
long start = cal.getTimeInMillis();
cal.set(2008, 0, 1);
long end = cal.getTimeInMillis();
for(int i = 0; i < 10; i++) {
Date d = new Date(start + (long)(rand.nextDouble() * (end - start)));
System.out.println(format.format(d));
}
4.随机生成颜色
方式一: 给定范围获得随机颜色[Java] 纯文本查看 复制代码 private Color getRandColor(int fc, int bc) {
Random random = new Random();
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
getRandColor(200, 250)
方式二:生成随机十六进制颜色代码
[Java] 纯文本查看 复制代码 //随机生成颜色代码
public String getColor(){
//红色
String red;
//绿色
String green;
//蓝色
String blue;
//生成随机对象
Random random = new Random();
//生成红色颜色代码
red = Integer.toHexString(random.nextInt(256)).toUpperCase();
//生成绿色颜色代码
green = Integer.toHexString(random.nextInt(256)).toUpperCase();
//生成蓝色颜色代码
blue = Integer.toHexString(random.nextInt(256)).toUpperCase();
//判断红色代码的位数
red = red.length()==1 ? "0" + red : red ;
//判断绿色代码的位数
green = green.length()==1 ? "0" + green : green ;
//判断蓝色代码的位数
blue = blue.length()==1 ? "0" + blue : blue ;
//生成十六进制颜色值
String color = "#"+red+green+blue;
return color;
}
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