Question

打开excel出现灾难性错误并提示内存溢出的解决方法

不行，重装过，我用的是misrosoft office 2010，就因为加载了一个插件就会出现灾难性错误，确定后又出现内存溢出，继续确定后才可使用，好烦，后来在选项中关闭那个插件才不会出现那些错误提示，可是那个被禁用的插件又是我工作所需，必须安装在微软的excel软件中WPS不可以，然而之前我装的是2003经典版的就是很好的，哎，想用个新版本的竟然会出现这种问题，但愿高手能不吝赐教啊，拜谢！

Answer 1

POI的诞生解决了Excel的解析难题（POI即“讨厌的电子表格”），但如果用不好POI，也会导致程序出现一些BUG，例如内存溢出，假空行，公式等等问题。下面介绍一种解决POI读取Excel内存溢出的问题。
POI读取Excel有两种模式，一种是用户模式，一种是SAX模式，将xlsx格式的文档转换成CVS格式后再进行处理用户模式相信大家都很清楚，也是POI常用的方式，用户模式API接口丰富，我们可以很容易的使用POI的API读取Excel，但用户模式消耗的内存很大，当遇到很多sheet、大数据网格、假空行、公式等问题时，很容易导致内存溢出。POI官方推荐解决内存溢出的方式使用CVS格式解析，我们不可能手工将Excel文件转换成CVS格式再上传，这样做太麻烦了，好再POI给出了xlsx转换CVS的例子，基于这个例子进行了一下改造，即可解决用户模式读取Excel内存溢出的问题。下面附上代码:
[java] view plaincopy
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.openxml4j.opc.PackageAccess;
import org.apache.poi.ss.usermodel.BuiltinFormats;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.xssf.eventusermodel.ReadOnlySharedStringsTable;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.model.StylesTable;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

/**
* 使用CVS模式解决XLSX文件，可以有效解决用户模式内存溢出的问题
* 该模式是POI官方推荐的读取大数据的模式，在用户模式下，数据量较大、Sheet较多、或者是有很多无用的空行的情况
* ，容易出现内存溢出,用户模式读取Excel的典型代码如下： FileInputStream file=new
* FileInputStream("c:\\test.xlsx"); Workbook wb=new XSSFWorkbook(file);
*
*
* @author 山人
*/
public class XLSXCovertCSVReader {

/**
* The type of the data value is indicated by an attribute on the cell. The
* value is usually in a "v" element within the cell.
*/
enum xssfDataType {
BOOL, ERROR, FORMULA, INLINESTR, SSTINDEX, NUMBER,
}

/**
* 使用xssf_sax_API处理Excel,请参考： http://poi.apache.org/spreadsheet/how-to.html#xssf_sax_api
* <p/>
* Also see Standard ECMA-376, 1st edition, part 4, pages 1928ff, at
* http://www.ecma-international.org/publications/standards/Ecma-376.htm
* <p/>
* A web-friendly version is http://openiso.org/Ecma/376/Part4
*/
class MyXSSFSheetHandler extends DefaultHandler {

/**
* Table with styles
*/
private StylesTable stylesTable;

/**
* Table with unique strings
*/
private ReadOnlySharedStringsTable sharedStringsTable;

/**
* Destination for data
*/
private final PrintStream output;

/**
* Number of columns to read starting with leftmost
*/
private final int minColumnCount;

// Set when V start element is seen
private boolean vIsOpen;

// Set when cell start element is seen;
// used when cell close element is seen.
private xssfDataType nextDataType;

// Used to format numeric cell values.
private short formatIndex;
private String formatString;
private final DataFormatter formatter;

private int thisColumn = -1;
// The last column printed to the output stream
private int lastColumnNumber = -1;

// Gathers characters as they are seen.
private StringBuffer value;
private String[] record;
private List<String[]> rows = new ArrayList<String[]>();
private boolean isCellNull = false;

/**
* Accepts objects needed while parsing.
*
* @param styles
* Table of styles
* @param strings
* Table of shared strings
* @param cols
* Minimum number of columns to show
* @param target
* Sink for output
*/
public MyXSSFSheetHandler(StylesTable styles,
ReadOnlySharedStringsTable strings, int cols, PrintStream target) {
this.stylesTable = styles;
this.sharedStringsTable = strings;
this.minColumnCount = cols;
this.output = target;
this.value = new StringBuffer();
this.nextDataType = xssfDataType.NUMBER;
this.formatter = new DataFormatter();
record = new String[this.minColumnCount];
rows.clear();// 每次读取都清空行集合
}

/*
* (non-Javadoc)
*
* @see
* org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String,
* java.lang.String, java.lang.String, org.xml.sax.Attributes)
*/
public void startElement(String uri, String localName, String name,
Attributes attributes) throws SAXException {

if ("inlineStr".equals(name) || "v".equals(name)) {
vIsOpen = true;
// Clear contents cache
value.setLength(0);
}
// c => cell
else if ("c".equals(name)) {
// Get the cell reference
String r = attributes.getValue("r");
int firstDigit = -1;
for (int c = 0; c < r.length(); ++c) {
if (Character.isDigit(r.charAt(c))) {
firstDigit = c;
break;
}
}
thisColumn = nameToColumn(r.substring(0, firstDigit));

// Set up defaults.
this.nextDataType = xssfDataType.NUMBER;
this.formatIndex = -1;
this.formatString = null;
String cellType = attributes.getValue("t");
String cellStyleStr = attributes.getValue("s");
if ("b".equals(cellType))
nextDataType = xssfDataType.BOOL;
else if ("e".equals(cellType))
nextDataType = xssfDataType.ERROR;
else if ("inlineStr".equals(cellType))
nextDataType = xssfDataType.INLINESTR;
else if ("s".equals(cellType))
nextDataType = xssfDataType.SSTINDEX;
else if ("str".equals(cellType))
nextDataType = xssfDataType.FORMULA;
else if (cellStyleStr != null) {
// It's a number, but almost certainly one
// with a special style or format
int styleIndex = Integer.parseInt(cellStyleStr);
XSSFCellStyle style = stylesTable.getStyleAt(styleIndex);
this.formatIndex = style.getDataFormat();
this.formatString = style.getDataFormatString();
if (this.formatString == null)
this.formatString = BuiltinFormats
.getBuiltinFormat(this.formatIndex);
}
}

}

/*
* (non-Javadoc)
*
* @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String,
* java.lang.String, java.lang.String)
*/
public void endElement(String uri, String localName, String name)
throws SAXException {

String thisStr = null;

// v => contents of a cell
if ("v".equals(name)) {
// Process the value contents as required.
// Do now, as characters() may be called more than once
switch (nextDataType) {

case BOOL:
char first = value.charAt(0);
thisStr = first == '0' ? "FALSE" : "TRUE";
break;

case ERROR:
thisStr = "\"ERROR:" + value.toString() + '"';
break;

case FORMULA:
// A formula could result in a string value,
// so always add double-quote characters.
thisStr = '"' + value.toString() + '"';
break;

case INLINESTR:
// TODO: have seen an example of this, so it's untested.
XSSFRichTextString rtsi = new XSSFRichTextString(
value.toString());
thisStr = '"' + rtsi.toString() + '"';
break;

Answer 2

孩子,该清理虚拟内存了.

这个就没办法了,估计是插件和10版本的兼容问题,你看能不能换一个插件或者换一个OFFICE软件,其实用WPS也不错的,不一定必须要用OFFICE软件.

追问

恐怕不是虚拟内存的原因，毕竟之前其他的软件没出现过此类问题，请看上面的追问。请教一下：如何清理虚拟内存啊？

追答

卸载一些不常用的软件吧.

Answer 3

卸载office。然后重新安装。

Answer 4

下载个绿色版的微软的2003office，没问题的