原文链接 https://biezhi.github.io/2015/09/java-to-achieve-the-progressbar-of-the-commandline.html
注：以下为加速网络访问所做的原文缓存，经过重新格式化，可能存在格式方面的问题，或偶有遗漏信息，请以原文为准。
public class ProgressBar {
private double finishPoint;
private double barLength;
public ProgressBar(){
this.finishPoint = 100;
this.barLength = 20;
}
public ProgressBar(double finishPoint, int barLength){
this.finishPoint = finishPoint;
this.barLength = barLength;
}
/**
* 显示进度条
* @param currentPoint 当前点
* @param finishPoint 结束点
* @param barLength 进度条长度(字符)
* @return 进度条结果
*/
public void showBarByPoint(double currentPoint) {
// 根据进度参数计算进度比率
double rate = currentPoint / this.finishPoint;
// 根据进度条长度计算当前记号
int barSign = (int) (rate * this.barLength);
// 生成进度条
System.out.print("\r");
System.out.print(makeBarBySignAndLength(barSign) + String.format(" %.2f%%", rate * 100));
}
/**
* 构造进度条
* @param barSign 进度条标记(当前点)
* @param barLength 进度条长度
* @return 字符型进度条
*/
private String makeBarBySignAndLength(int barSign) {
StringBuilder bar = new StringBuilder();
bar.append("[");
for (int i=1; i<=this.barLength; i++) {
if (i < barSign) {
bar.append("-");
} else if (i == barSign) {
bar.append(">");
} else {
bar.append(" ");
}
}
bar.append("]");
return bar.toString();
}
}