bugfix: Fix Potential Data Read Failures Caused by Custom Data Formats.by @zyd0131 at #2319 (#156)

Author: psxjoy

fastexcel-core/src/main/java/cn/idev/excel/metadata/format/DataFormatter.java

@@ -118,6 +118,8 @@ public class DataFormatter {
      */
     private static final String invalidDateTimeString;
 
+    private static final BigDecimal TEN = new BigDecimal(10);
+
     static {
         StringBuilder buf = new StringBuilder();
         for (int i = 0; i < 255; i++) {buf.append('#');}
@@ -524,11 +526,17 @@ public InternalDecimalFormatWithScale(String pattern, DecimalFormatSymbols symbo
             setExcelStyleRoundingMode(df);
             Matcher endsWithCommasMatcher = endsWithCommas.matcher(pattern);
             if (endsWithCommasMatcher.find()) {
+                int index_point = pattern.indexOf(".");
+                int index_comma = pattern.indexOf(",");
+                int cnt = index_comma - index_point - 1;
                 String commas = (endsWithCommasMatcher.group(1));
                 BigDecimal temp = BigDecimal.ONE;
                 for (int i = 0; i < commas.length(); ++i) {
                     temp = temp.multiply(ONE_THOUSAND);
                 }
+                for (int i = 0; i < cnt ; i++) {
+                    temp = temp.multiply(TEN);
+                }
                 divider = temp;
             } else {
                 divider = null;

fastexcel-test/src/test/java/cn/idev/excel/test/temp/issue2319/Issue2319.java

@@ -0,0 +1,13 @@
+package cn.idev.excel.test.temp.issue2319;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@EqualsAndHashCode
+public class Issue2319 {
+    private String num1;
+    private String num2;
+}

fastexcel-test/src/test/java/cn/idev/excel/test/temp/issue2319/Issue2319Test.java

@@ -0,0 +1,36 @@
+package cn.idev.excel.test.temp.issue2319;
+
+import java.io.File;
+
+import com.alibaba.fastjson2.JSON;
+
+import cn.idev.excel.EasyExcel;
+import cn.idev.excel.FastExcel;
+import cn.idev.excel.read.listener.PageReadListener;
+import cn.idev.excel.test.util.TestFileUtil;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+
+@Slf4j
+public class Issue2319Test {
+    @Test
+    public void IssueTest1() {
+        String fileName = TestFileUtil.getPath() + "temp/issue2319" + File.separator + "test1.xlsx";
+        FastExcel.read(fileName, Issue2319.class, new PageReadListener<Issue2319>(dataList -> {
+            for (Issue2319 issueData : dataList) {
+                System.out.println(("读取到一条数据{}" + JSON.toJSONString(issueData)));
+            }
+        })).sheet().doRead();
+    }
+
+    //CS304 (manually written) Issue link: https://github.com/alibaba/easyexcel/issues/2319
+    @Test
+    public void IssueTest2() {
+        String fileName = TestFileUtil.getPath() + "temp/issue2319" + File.separator + "test2.xlsx";
+        FastExcel.read(fileName, Issue2319.class, new PageReadListener<Issue2319>(dataList -> {
+            for (Issue2319 issueData : dataList) {
+                System.out.println(("读取到一条数据{}" + JSON.toJSONString(issueData)));
+            }
+        })).sheet().doRead();
+    }
+}

fastexcel-test/src/test/resources/temp/issue2319/test1.xlsx

@@ -4,6 +4,6 @@
 具体更新内容如下：
 - 【改进】移除 `itext` 依赖库，将 `转换PDF` 功能迁移至新项目；
 - 【修复】fill填充空数据，可能导致行数据错乱的问题；
-- 【修复】打印CSV文件的 `hashcode`，可能会产生的堆栈溢出问题；
+- 【修复】自定义数据格式可能导致数据读取失败的问题；
 - 【优化】增加报错内容详细信息；
 - 【优化】更新代码格式和部分错别字。