说明：数据库使用mysql，导入的字段类型只能是有varchar，Date 类型
火狐导出文件时做特殊设置，不能用url编码
源代码参考附件：
ExcelUtil.java: 导入核心代码
package com.lw.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.net.URLEncoder;
import java.sql.SQLException;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.InputMismatchException;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.FilenameUtils;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
/**
* Excel组件
*
* @author liwei
* @version 1.0
* @since 1.0
*/
public class ExcelUtil {
/**
* Excel 2003
*/
private final static String XLS = "xls";
/**
* Excel 2007
*/
private final static String XLSX = "xlsx";
public static void main(String[] args) {
String file = "d://importStudentDatas.xls";
String[] columnArray = new String[]{"code", "name", "birthDate"};
Map checkColumn = new HashMap();
checkColumn.put("code", ColumnCheckTypeEnum.CHECK_TYPE_PRICE_1);
try {
List list = ExcelUtil.excelToList(new File(file), 0, Student.class, columnArray, checkColumn);
System.out.println(list.size());
for (int i = 0; i < list.size(); i++) {
Student stu = list.get(i);
System.out.println("编码：" + stu.getCode() + " >>>>> 名称：" + stu.getName() + " >>>>> 生日：" + stu.getBirthDate());
}
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
}
/***
* 导入Excel数据
*
* 1、读取excel数据
* 2、校验数据的合法性（日期，金额，字符长度（和数据库结构比较））
* 3、合法数据绑定到bean对象中（反射）
* 4、得到数据层面校验通过的bean对象集合，
* @param file 导入数据文件
* @param entityClass bean对象类型bean.class
* @param sheetIndex sheet索引
* @param columnArray 字段列数组 （需要导入的字段数组）
* @param checkColumn 需要校验格式的字段列Map
* @throws IOException
* @throws NoSuchFieldException
* @throws SecurityException
* @throws InstantiationException
* @throws SQLException
* @throws IllegalAccessException
* @throws ParseException
*/
public static List excelToList(File file, Integer sheetIndex, Class entityClass, String[] columnArray, Map checkColumn) throws IOException, SecurityException, NoSuchFieldException, InstantiationException, SQLException, IllegalAccessException, ParseException {
List list = new ArrayList();
Workbook workbook = null;
if (XLS.equalsIgnoreCase(FilenameUtils.getExtension(file.getName()))) {
workbook = new HSSFWorkbook(new FileInputStream(file));
} else if (XLSX.equalsIgnoreCase(FilenameUtils.getExtension(file.getName()))) {
workbook = new XSSFWorkbook(new FileInputStream(file));
} else {
throw new IOException("导入excel出错，不支持文件类型！");
}
if(sheetIndex==null) {
sheetIndex = 0;
}
if((sheetIndex+1)>workbook.getNumberOfSheets()) {
throw new IndexOutOfBoundsException("导入excel出错，指定sheet索引越界！");
}
// sheet中要导出的列
if(columnArray==null || columnArray.length<1) {
throw new NullPointerException("导入excel出错，导入列设置错误！");
}
// 拿到sheet
Sheet sheet = workbook.getSheetAt(sheetIndex);
String sheetName = sheet.getSheetName(); // sheetName 使用表名称
// 解析公式结果
FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
// 每个sheet中的数据
List> dataList = readSheet(sheet, evaluator, columnArray);
// 数据库表对应的字段列信息
List columnDatas = null;
try {
columnDatas = ProDataUtil.getMySqlColumnDatas(sheetName, "scp");
} catch (SQLException e) {
throw new SQLException("导入excel出错，获取表信息错误！");
}
// 遍历数据库表对应的字段列信息
for(int j=0; j rowData = dataList.get(j);
T o = null;
try {
o = (T) entityClass.newInstance();
} catch (IllegalAccessException e) {
throw new IllegalAccessException("导入excel出错，错误信息：" + e.getMessage());
}
for(int k=0; k-1 && price.split("\\.")[1].length()>2) {
throw new InputMismatchException(errMsg + "此列为金额数值列，小数点后不超过2位小数，请检查excel数据是否合格！");
}
} catch (NumberFormatException e) {
throw new NumberFormatException(errMsg + "此列为金额数值列，请检查excel数据是否合格！");
}
}
// 价格类型校验，取4位小数
else if(ColumnCheckTypeEnum.CHECK_TYPE_PRICE_1.equals(checkType)) {
try {
String price = value.toString();
new BigDecimal(price);
if(price.indexOf(".")>-1 && price.split("\\.")[1].length()>4) {
throw new InputMismatchException(errMsg + "此列为金额数值列，小数点后不超过4位小数，请检查excel数据是否合格！");
}
} catch (NumberFormatException e) {
throw new NumberFormatException(errMsg + "此列为金额数值列，请检查excel数据是否合格！");
}
}
// 2、自定义校验完成后，进行常规校验
// 通过属性名称获取属性，把值设置到属性里面
Field field = entityClass.getDeclaredField(cd.getColumnLowName());
field.setAccessible(true); // 设置属性可访问， private
if("java.lang.String".equalsIgnoreCase(cd.getJavaType())) {
if(value.toString().length()>Integer.parseInt(cd.getDataMaxLength())) {
throw new SQLException(errMsg + "字符长度超过数据库设置长度限制！数据库长度【"+cd.getDataMaxLength()+"】，当前文本长度【"+value.toString().length()+"】");
}
try {
field.set(o, value.toString());
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException(errMsg + e.getMessage());
} catch (IllegalAccessException e) {
throw new IllegalAccessException(errMsg + e.getMessage());
}
} else if("java.util.Date".equalsIgnoreCase(cd.getJavaType())) {
try {
field.set(o, (Date)value);
} catch (ClassCastException e) {
throw new ClassCastException(errMsg + "数据格式错误，无法将【"+value+"】转换为java.util.Date类型日期格式。" + e.getMessage());
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException(errMsg + e.getMessage());
} catch (IllegalAccessException e) {
throw new IllegalAccessException(errMsg + e.getMessage());
}
} else if("java.lang.Integer".equalsIgnoreCase(cd.getJavaType())) {
try {
// field.setInt(o, Integer.parseInt(value.toString())); // Int to Integer 赋值时类型不匹配
field.set(o, Integer.parseInt(value.toString()));
} catch (NumberFormatException e) {
throw new NumberFormatException(errMsg + "数据格式错误，无法将【"+value+"】转换为java.lang.Integer类型。" + e.getMessage());
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException(errMsg + e.getMessage());
} catch (IllegalAccessException e) {
throw new IllegalAccessException(errMsg + e.getMessage());
}
}
}
list.add(o);
}
return list;
}
/***
* 读取单个sheet
* 导入Excel数据使用私有方法
* @param sheet 单个sheet
* @param evaluator 解析公式结果
* @param columnArray 字段列数组
*/
private static List> readSheet(Sheet sheet, FormulaEvaluator evaluator, String... columnArray) {
List> list = new ArrayList>();
int firstRowNum = sheet.getFirstRowNum();
int lastRowNum = sheet.getLastRowNum();
// 从第二行开始读取数据
for (int rowIndex = firstRowNum + 1; rowIndex <= lastRowNum; rowIndex++) {
Row row = sheet.getRow(rowIndex);
short firstCellNum = row.getFirstCellNum();
// short maxColIx = row.getLastCellNum();
Map rowMap = new HashMap();
// 读取列的时候，按照设置好的字段列的数量长度循环读取
for (short colIndex = firstCellNum; colIndex < columnArray.length; colIndex++) {
Cell cell = row.getCell(new Integer(colIndex)+1); // 从第二列开始导入， 第一列序号列不做导入
CellValue cellValue = evaluator.evaluate(cell);
if (cellValue == null) {
continue;
}
// 经过公式解析，最后只存在Boolean、Numeric和String三种数据类型，此外就是Error了
// 其余数据类型，根据官方文档，完全可以忽略http://poi.apache.org/spreadsheet/eval.html
switch (cellValue.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
rowMap.put(columnArray[colIndex], cellValue.getBooleanValue());
break;
case Cell.CELL_TYPE_NUMERIC:
// 这里的日期类型会被转换为数字类型，需要判别后区分处理
if (HSSFDateUtil.isCellDateFormatted(cell)) {
rowMap.put(columnArray[colIndex], cell.getDateCellValue());
} else {
rowMap.put(columnArray[colIndex], cellValue.getNumberValue());
}
break;
case Cell.CELL_TYPE_STRING:
rowMap.put(columnArray[colIndex], cellValue.getStringValue());
break;
case Cell.CELL_TYPE_FORMULA:
break;
case Cell.CELL_TYPE_BLANK:
break;
case Cell.CELL_TYPE_ERROR:
break;
default:
break;
}
}
list.add(rowMap);
}
return list;
}
private static int getIndexOfArrayItem(String arrItem, String[] array) {
int index = -1;
for (int i = 0; i < array.length; i++) {
if(array[i].equals(arrItem)) {
index = i;
break;
}
}
return index;
}
/***
* 导出Excel数据
* @param sheetName sheet名称
* @param fileName 导出文件名
* @param list 要导出的数据
* @param response
* @throws IOException
*/
public static void exportDatas(String sheetName, String fileName, List> list, HttpServletRequest request, HttpServletResponse response) throws IOException {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet(sheetName);
int rowNum = 0;
// 设置单元格样式(标题样式)
HSSFCellStyle styleTitle = wb.createCellStyle();
styleTitle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
styleTitle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
styleTitle.setBorderRight(HSSFCellStyle.BORDER_THIN);
styleTitle.setBorderTop(HSSFCellStyle.BORDER_THIN);
// 对齐方式
styleTitle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
styleTitle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
// 字体
HSSFFont font = wb.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
styleTitle.setFont(font);
// 设置单元格样式(数据值样式)
HSSFCellStyle styleContent = wb.createCellStyle();
styleContent.setBorderBottom(HSSFCellStyle.BORDER_THIN);
styleContent.setBorderLeft(HSSFCellStyle.BORDER_THIN);
styleContent.setBorderRight(HSSFCellStyle.BORDER_THIN);
styleContent.setBorderTop(HSSFCellStyle.BORDER_THIN);
styleContent.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 标题行
HSSFRow rowTitle = sheet.createRow(rowNum++);
int i = 0;
HSSFCell cellH0 = rowTitle.createCell(i++);
cellH0.setCellValue("序号");
cellH0.setCellStyle(styleTitle);
for(Map.Entry tmp : list.get(0).entrySet()) {
HSSFCell cellH = rowTitle.createCell(i++);
cellH.setCellValue(tmp.getKey());
cellH.setCellStyle(styleTitle);
}
int cellOrder = 1;
for (Map map : list) {
HSSFRow row = sheet.createRow(rowNum++);
int j = 0;
// 序号
HSSFCell cellC0 = row.createCell(j++);
cellC0.setCellValue(cellOrder++);
cellC0.setCellStyle(styleContent);
for(Map.Entry entry : map.entrySet()) {
HSSFCell cellC = row.createCell(j++);
sheet.setColumnWidth(cellC.getColumnIndex(), 256 * (11 + 10));
cellC.setCellValue(entry.getValue()+"");
cellC.setCellStyle(styleContent);
}
}
String agent = request.getHeader("User-Agent");
// 火狐浏览器导出文件不会url解码
if(StringUtil.isEmpty(agent)==false && agent.toLowerCase().indexOf("firefox")>-1) {
response.setHeader("Content-disposition", "attachment;filename=\"" + new String(fileName.getBytes("UTF-8"), "ISO-8859-1")+".xls\"");
} else {
response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName+".xls", "UTF-8"));
}
response.setContentType("application/vnd.ms-excel;charset=UTF-8");
OutputStream out = response.getOutputStream();
wb.write(out);
out.flush();
out.close();
}
}
ProDataUtil.java 获取数据库表信息
package com.lw.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class ProDataUtil {
private static String url = "jdbc:mysql://192.168.1.1:3306/dbName?characterEncoding=utf8&zeroDateTimeBehavior=convertToNull";
private static String username = "root";
private static String password = "root";
private static String driverClassName = "com.mysql.jdbc.Driver";
/**
* 查询表的字段，封装成List
*
* @param tableName 表名
* @param schemaName 数据库名
* @return
* @throws SQLException
*/
public static List getMySqlColumnDatas(String tableName, String schemaName) throws SQLException {
String SQLColumns = " select COLUMN_NAME,DATA_TYPE,column_comment,numeric_scale,numeric_precision,character_maximum_length,ordinal_position from information_schema.COLUMNS where table_name = '" + tableName + "'" + " and TABLE_SCHEMA='" + schemaName + "' " + " ORDER by ordinal_position";
Connection con = getConnection();
PreparedStatement ps = con.prepareStatement(SQLColumns);
List columnList = new ArrayList();
ResultSet rs = ps.executeQuery();
while (rs.next()) {
String name = rs.getString(1);
String lowName = getColumnBeanName(name); // 将XXX_XXX转换成xxxXxx的格式
String type = rs.getString(2).toUpperCase(); // mysql 区分大小写
String javaType = getType(rs.getString(2), rs.getString(4), rs.getString(5)); // mysql 区分大小写
String comment = rs.getString(3);
String dataScale = rs.getString(4);
String dataPrecision = rs.getString(5);
String dataMaxLength = rs.getString(6);
ColumnData cd = new ColumnData(name, lowName, type, javaType, comment, dataScale, dataPrecision, dataMaxLength);
columnList.add(cd);
}
rs.close();
ps.close();
con.close();
return columnList;
}
public static Connection getConnection() throws SQLException {
try{
Class.forName(driverClassName);
}catch(Exception e){
e.printStackTrace();
}
return DriverManager.getConnection(url, username, password);
}
private static String getColumnBeanName(String column) {
String[] split = column.split("_");
StringBuffer columnVal = new StringBuffer();
if (split.length > 1) {
for (int i = 0; i < split.length; i++) {
String colVal = "";
if (i == 0) {
colVal = split[i].toLowerCase();
columnVal.append(colVal);
} else {
colVal = split[i].substring(0, 1).toUpperCase() + split[i].substring(1, split[i].length()).toLowerCase();
columnVal.append(colVal);
}
}
columnVal.toString();
} else {
String colVal = column.toLowerCase();
columnVal.append(colVal);
}
return columnVal.toString();
}
/***
* 获取java类型
* @param type 数据库数据类型
* @param dataScale 小数位数
* @param dataPrecision 数据精度
* @return
*/
private static String getType(String type, String dataScale, String dataPrecision){
type=type.toLowerCase();
if("char".equalsIgnoreCase(type) || "varchar".equalsIgnoreCase(type)|| "varchar2".equalsIgnoreCase(type)){
return "java.lang.String";
}else if("NUMBER".equalsIgnoreCase(type)|| "numeric".equalsIgnoreCase(type)){//
if((dataScale!=null&&!dataScale.equals("")&&!dataScale.equals("0"))){
if(dataPrecision!=null&&dataPrecision.equals("38")){
return "java.math.BigDecimal";
}else{
return "java.lang.Double";
}
}else {
if(dataPrecision!=null&&dataPrecision.equals("38")){
return "java.math.BigDecimal";
}else{
return "java.lang.Long";
}
}
}else if("decimal".equalsIgnoreCase(type)){//
return "java.math.BigDecimal";
}else if( "DATE".equalsIgnoreCase(type)){
return "java.util.Date";
}else if( "DATETIME".equalsIgnoreCase(type)){
return "java.util.Date";
}else if( "BLOB".equalsIgnoreCase(type)){
return "java.sql.Blob";
}else if( "CLOB".equalsIgnoreCase(type)){
return "java.sql.Clob";
}else if("int".equalsIgnoreCase(type)){
return "java.lang.Integer";
}else if("TINYINT".equalsIgnoreCase(type)){
return "java.lang.Boolean";
}else if("double".equalsIgnoreCase(type)){
return "java.math.BigDecimal";
}else if("datetime".equalsIgnoreCase(type)){
return "java.util.Date";
}
return null;
}
}