java中解析上传的excel文件（xls,xlsx）
一、在maven库中导入相关依赖
其中poi是解析xls格式的，poi-ooxml是解析xlsx格式的
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<!-- POI,excel解析相关 -->
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi</artifactId>
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<version>
3.17</version>
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</dependency>
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<!-- https:
//mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi-ooxml</artifactId>
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<version>
3.17</version>
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</dependency>
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<dependency>
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<groupId>net.sf.json-lib</groupId>
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<artifactId>json-lib</artifactId>
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<version>
2.4</version>
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<classifier>jdk15</classifier>
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</dependency>
二、解析代码
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.text.DateFormat;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.Map;
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import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
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import org.apache.poi.poifs.filesystem.POIFSFileSystem;
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import org.apache.poi.ss.usermodel.Cell;
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import org.apache.poi.ss.usermodel.Row;
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import org.apache.poi.ss.usermodel.Sheet;
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import org.apache.poi.ss.usermodel.Workbook;
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import org.apache.poi.xssf.usermodel.XSSFWorkbook;
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import net.sf.json.JSONArray;
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import net.sf.json.JSONObject;
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import org.springframework.stereotype.Component;
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import sun.applet.Main;
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@Component
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public
class
ExcelResolve {
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public
final
String
XLSX
=
".xlsx";
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public
final String XLS=
".xls";
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/**
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* 获取Excel文件（.xls和.xlsx都支持）
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* @param file
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* @return 解析excle后的Json数据
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* @throws IOException
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* @throws FileNotFoundException
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* @throws InvalidFormatException
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*/
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public JSONArray
readExcel
(File file)
throws Exception{
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int
res
= checkFile(file);
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if (res ==
0) {
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System.out.println(
"File not found");
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}
else
if (res ==
1) {
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return readXLSX(file);
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}
else
if (res ==
2) {
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return readXLS(file);
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}
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JSONArray
array
=
new
JSONArray();
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return array;
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}
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/**
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* 判断File文件的类型
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* @param file 传入的文件
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* @return 0-文件为空，1-XLSX文件，2-XLS文件，3-其他文件
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*/
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public
int
checkFile
(File file){
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if (file==
null) {
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return
0;
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}
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String
flieName
= file.getName();
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if (flieName.endsWith(XLSX)) {
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return
1;
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}
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if (flieName.endsWith(XLS)) {
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return
2;
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}
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return
3;
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}
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/**
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* 读取XLSX文件
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* @param file
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* @return
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* @throws IOException
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* @throws InvalidFormatException
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*/
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public JSONArray
readXLSX
(File file)
throws InvalidFormatException, IOException{
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Workbook
book
=
new
XSSFWorkbook(file);
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Sheet
sheet
= book.getSheetAt(
0);
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return read(sheet, book);
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}
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/**
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* 读取XLS文件
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* @param file
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* @return
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* @throws IOException
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* @throws FileNotFoundException
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*/
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public JSONArray
readXLS
(File file)
throws FileNotFoundException, IOException{
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POIFSFileSystem
poifsFileSystem
=
new
POIFSFileSystem(
new
FileInputStream(file));
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Workbook
book
=
new
HSSFWorkbook(poifsFileSystem);
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Sheet
sheet
= book.getSheetAt(
0);
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return read(sheet, book);
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}
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/**
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* 解析数据
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* @param sheet 表格sheet对象
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* @param book 用于流关闭
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* @return
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* @throws IOException
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*/
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public JSONArray
read
(Sheet sheet,Workbook book)
throws IOException{
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int
rowStart
= sheet.getFirstRowNum();
// 首行下标
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int
rowEnd
= sheet.getLastRowNum();
// 尾行下标
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// 如果首行与尾行相同，表明只有一行，直接返回空数组
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if (rowStart == rowEnd) {
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book.close();
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return
new
JSONArray();
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}
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// 获取第一行JSON对象键
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Row
firstRow
= sheet.getRow(rowStart);
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int
cellStart
= firstRow.getFirstCellNum();
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int
cellEnd
= firstRow.getLastCellNum();
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Map<Integer, String> keyMap =
new
HashMap<Integer, String>();
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for (
int
j
= cellStart; j < cellEnd; j++) {
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keyMap.put(j,getValue(firstRow.getCell(j), rowStart, j, book,
true));
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}
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// 获取每行JSON对象的值
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JSONArray
array
=
new
JSONArray();
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for(
int
i
= rowStart+
1; i <= rowEnd ; i++) {
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Row
eachRow
= sheet.getRow(i);
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JSONObject
obj
=
new
JSONObject();
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StringBuffer
sb
=
new
StringBuffer();
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for (
int
k
= cellStart; k < cellEnd; k++) {
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if (eachRow !=
null) {
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String
val
= getValue(eachRow.getCell(k), i, k, book,
false);
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sb.append(val);
// 所有数据添加到里面，用于判断该行是否为空
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obj.put(keyMap.get(k),val);
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}
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}
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if (sb.toString().length() >
0) {
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array.add(obj);
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}
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}
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book.close();
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return array;
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}
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/**
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* 获取每个单元格的数据
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* @param cell 单元格对象
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* @param rowNum 第几行
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* @param index 该行第几个
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* @param book 主要用于关闭流
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* @param isKey 是否为键：true-是，false-不是。 如果解析Json键，值为空时报错；如果不是Json键，值为空不报错
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* @return
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* @throws IOException
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*/
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public String
getValue
(Cell cell,int rowNum,int index,Workbook book,boolean isKey)
throws IOException{
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// 空白或空
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if (cell ==
null || cell.getCellType()==Cell.CELL_TYPE_BLANK ) {
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if (isKey) {
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book.close();
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throw
new
NullPointerException(String.format(
"the key on row %s index %s is null ", ++rowNum,++index));
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}
else{
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return
"";
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}
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}
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// 0. 数字 类型
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if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
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if (HSSFDateUtil.isCellDateFormatted(cell)) {
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Date
date
= cell.getDateCellValue();
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DateFormat
df
=
new
SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
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return df.format(date);
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}
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String
val
= cell.getNumericCellValue()+
"";
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val = val.toUpperCase();
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if (val.contains(
"E")) {
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val = val.split(
"E")[
0].replace(
".",
"");
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}
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return val;
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}
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// 1. String类型
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if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
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String
val
= cell.getStringCellValue();
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if (val ==
null || val.trim().length()==
0) {
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if (book !=
null) {
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book.close();
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}
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return
"";
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}
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return val.trim();
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}
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// 2. 公式 CELL_TYPE_FORMULA
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if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
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return cell.getStringCellValue();
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}
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// 4. 布尔值 CELL_TYPE_BOOLEAN
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if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
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return cell.getBooleanCellValue()+
"";
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}
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// 5. 错误 CELL_TYPE_ERROR
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return
"";
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}
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}
三、单元测试
这里点出调用封装好的组件时，要用try catch将异常抛出
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@RunWith(SpringRunner.class)
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@SpringBootTest
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public
class
ExcelTest
extends
TestCase {
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@Autowired
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private ExcelResolve excelResolve;
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@Test
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public
void
readTest
()
throws Exception{
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File
f1
=
new
File(
"D:/work/1.xlsx");
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try {
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System.out.println(excelResolve.readExcel(f1));
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}
catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
四、测试结果
