导出excel功能,报错。错误日志提示::The maximum length of cell contents (text) is 32767 characters
调查后,poi会有单元格最大长度校验超过32767会报错。
需求调研:
调研发现,excel和csv文件本身存在单元格有32767的最大字符限制。
解决方案:
解决办法是程序不报错,但是生成excel或者csv 会自动截取单元格最大32767 characters。
1、通过java反射机制,设置单元格最大校验限制为Integer.MAX_VALUE(2147483647)。
导出生成excel文件之前调用设置单元格最大限制方法。
public void resetCellMaxTextLength() {
SpreadsheetVersion excel2007 = SpreadsheetVersion.EXCEL2007;
if (Integer.MAX_VALUE != excel2007.getMaxTextLength()) {
Field field;
try {
field = excel2007.getClass().getDeclaredField("_maxTextLength");
field.setAccessible(true);
field.set(excel2007,Integer.MAX_VALUE);
} catch (Exception e) {
e.printStackTrace();
}
}
}
2、修改源码,修改源码文件枚举类,同样也是设置最大校验限制为Integer.MAX_VALUE
package org.apache.poi.ss;
import org.apache.poi.ss.util.CellReference;
/**
* @description :Excel枚举
*/
public enum SpreadsheetVersion {
/**
* excel 枚举
**/
EXCEL97(65536, 256, 30, 3, 4000, 32767),
EXCEL2007(1048576, 16384, 255, 2147483647, 64000, Integer.MAX_VALUE);
private final int _maxRows;
private final int _maxColumns;
private final int _maxFunctionArgs;
private final int _maxCondFormats;
private final int _maxCellStyles;
private final int _maxTextLength;
<span class="hljs-keyword">private</span> SpreadsheetVersion(int maxRows, int maxColumns, int maxFunctionArgs, int maxCondFormats, int maxCellStyles, int maxText) {
<span class="hljs-keyword">this</span>._maxRows = maxRows;
<span class="hljs-keyword">this</span>._maxColumns = maxColumns;
<span class="hljs-keyword">this</span>._maxFunctionArgs = maxFunctionArgs;
<span class="hljs-keyword">this</span>._maxCondFormats = maxCondFormats;
<span class="hljs-keyword">this</span>._maxCellStyles = maxCellStyles;
<span class="hljs-keyword">this</span>._maxTextLength = maxText;
}
<span class="hljs-keyword">public</span> int getMaxRows() {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>._maxRows;
}
<span class="hljs-keyword">public</span> int getLastRowIndex() {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>._maxRows - <span class="hljs-number">1</span>;
}
<span class="hljs-keyword">public</span> int getMaxColumns() {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>._maxColumns;
}
<span class="hljs-keyword">public</span> int getLastColumnIndex() {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>._maxColumns - <span class="hljs-number">1</span>;
}
<span class="hljs-keyword">public</span> int getMaxFunctionArgs() {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>._maxFunctionArgs;
}
<span class="hljs-keyword">public</span> int getMaxConditionalFormats() {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>._maxCondFormats;
}
<span class="hljs-keyword">public</span> int getMaxCellStyles() {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>._maxCellStyles;
}
<span class="hljs-keyword">public</span> String getLastColumnName() {
<span class="hljs-keyword">return</span> CellReference.convertNumToColString(<span class="hljs-keyword">this</span>.getLastColumnIndex());
}
<span class="hljs-keyword">public</span> int getMaxTextLength() {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>._maxTextLength;
}
}
32767 是 2的15次方减1. 即可容纳不超过2的15次方的字符. 但请注意在单元格中只可显示1024个字符. 可在编辑栏中显示全部的32767个字符.
以前2003每个单元格只可容纳255个字符. 即256-1个. 此后版本的excel做了改进. 才能容纳更多的字符.