fix JSONReader.Feature.UseBigDecimalForDoubles when exponent != 0 (#3382)

tanghaoth90 · tanghaoth90 · commit 9c1cd834aeb2 · 2025-03-12T16:09:40.000+08:00
diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONReader.java b/core/src/main/java/com/alibaba/fastjson2/JSONReader.java
@@ -3093,10 +3093,14 @@ public final Number getNumber() {
                     }
                 }
 
-                if (exponent != 0 && (context.features & (Feature.UseBigDecimalForDoubles.mask | Feature.UseBigDecimalForFloats.mask)) == 0) {
+                if (exponent != 0) {
                     String decimalStr = decimal.toPlainString();
-                    return Double.parseDouble(
-                            decimalStr + "E" + exponent);
+                    if ((context.features & (Feature.UseBigDecimalForDoubles.mask | Feature.UseBigDecimalForFloats.mask)) == 0) {
+                        return Double.parseDouble(
+                                decimalStr + "E" + exponent);
+                    } else {
+                        return new BigDecimal(decimalStr + "E" + exponent);
+                    }
                 }
 
                 if ((context.features & Feature.UseDoubleForDecimals.mask) != 0) {

Original file line number	Diff line number	Diff line change
`@@ -3093,10 +3093,14 @@ public final Number getNumber() {`
`3093`	`3093`	`}`
`3094`	`3094`	`}`
`3095`	`3095`
`3096`		`- if (exponent != 0 && (context.features & (Feature.UseBigDecimalForDoubles.mask \| Feature.UseBigDecimalForFloats.mask)) == 0) {`
	`3096`	`+ if (exponent != 0) {`
`3097`	`3097`	`String decimalStr = decimal.toPlainString();`
`3098`		`- return Double.parseDouble(`
`3099`		`- decimalStr + "E" + exponent);`
	`3098`	`+ if ((context.features & (Feature.UseBigDecimalForDoubles.mask \| Feature.UseBigDecimalForFloats.mask)) == 0) {`
	`3099`	`+ return Double.parseDouble(`
	`3100`	`+ decimalStr + "E" + exponent);`
	`3101`	`+ } else {`
	`3102`	`+ return new BigDecimal(decimalStr + "E" + exponent);`
	`3103`	`+ }`
`3100`	`3104`	`}`
`3101`	`3105`
`3102`	`3106`	`if ((context.features & Feature.UseDoubleForDecimals.mask) != 0) {`