double转string

 1public String double2String(double d, int fNumber) {
 2        if (fNumber < 0)
 3            fNumber = 0;
 4
 5        String pattern = null;
 6        switch (fNumber) {
 7        case 0:
 8            pattern = "#0"; //$NON-NLS-1$
 9            break;
10        default:
11            pattern = "#0."; //$NON-NLS-1$
12            StringBuffer b = new StringBuffer(pattern);
13            for (int i = 0; i < fNumber; i++) {
14                b.append('#');
15            }
16            pattern = b.toString();
17            break;
18
19        }
20        DecimalFormat formatter = new DecimalFormat();
21        formatter.applyPattern(pattern);
22        String value = formatter.format(d);
23        return value;
24    }

double直接输出时,如果小数点后位数太长会出现字母e,采用本方法转换为string再输出