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                項目從別的庫拉取數據, 源數據庫沒處理Double小數位, 導致位數很多, 而我們這邊業務是: 這個字段 存文字說明或者數值結果 , 所以是字符串的, 這樣就出現保存到數據庫的字段, 出現科學計數法, 也就是結果里有E, 看著不方便, 所以處理一下。 解決就是使用 BigDecimal 中轉一下 ~~~ /** * double 轉為字符串, 可防止出現科學計數法 E * @param value double 值 * @param scale 保留幾位小數 * @return */ public static String doubleToString(Double value, Integer scale) { if(value == null){ return ""; } scale = scale == null ? 4 : scale; BigDecimal valueBig = BigDecimal.valueOf(value); return valueBig.setScale(scale ,BigDecimal.ROUND_HALF_UP).toString(); } ~~~
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