一、maven引用
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.3.5</version>
</dependency>
<!-- poi office -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.17</version>
</dependency>工具类
1、Excel注解定义
自定义注解ExcelField
@Target({ElementType.METHOD, ElementType.FIELD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface ExcelField {
/**
* 导出字段名（默认调用当前字段的“get”方法，如指定导出字段为对象，请填写“对象名.对象属性”，例：“area.name”、“office.name”）
*/
String value() default "";
/**
* 导出字段标题（需要添加批注请用“**”分隔，标题**批注，仅对导出模板有效）
*/
String title();
/**
* 字段类型（0：导出导入；1：仅导出；2：仅导入）
*/
int type() default 0;
/**
* 导出字段对齐方式（0：自动；1：靠左；2：居中；3：靠右）
*/
int align() default 0;
/**
* 导出字段字段排序（升序）
*/
int sort() default 0;
/**
* 如果是字典类型，请设置字典的type值
*/
String dictType() default "";
/**
* 反射类型
*/
Class<?> fieldType() default Class.class;
/**
* 字段归属组（根据分组导出导入）
*/
int[] groups() default {};
}2、导出Excel文件工具类，支持大数据量导出
import com.google.common.collect.Lists;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.HttpServletResponse;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.util.*;
/**
* 导出Excel文件（导出“XLSX”格式，支持大数据量导出
*/
public class ExportExcel {
private static Logger log = LoggerFactory.getLogger(ExportExcel.class);
/**
* 工作薄对象
*/
private SXSSFWorkbook wb;
/**
* 工作表对象
*/
private SXSSFSheet sheet;
/**
* 样式列表
*/
private Map<String, CellStyle> styles;
/**
* 当前行号
*/
private int rownum;
/**
* 注解列表（Object[]{ ExcelField, Field/Method }）
*/
List<Object[]> annotationList = Lists.newArrayList();
/**
* 构造函数
* @param title 表格标题，传“空值”，表示无标题
* @param cls 实体对象，通过annotation.ExportField获取标题
*/
public ExportExcel(String title, Class<?> cls){
this(title, cls, 1);
}
/**
* 构造函数
* @param title 表格标题，传“空值”，表示无标题
* @param cls 实体对象，通过annotation.ExportField获取标题
* @param type 导出类型（1:导出数据；2：导出模板）
* @param groups 导入分组
*/
public ExportExcel(String title, Class<?> cls, int type, int... groups){
// Get annotation field
Field[] fs = cls.getDeclaredFields();
for (Field f : fs){
ExcelField ef = f.getAnnotation(ExcelField.class);
if (ef != null && (ef.type()==0 || ef.type()==type)){
if (groups!=null && groups.length>0){
boolean inGroup = false;
for (int g : groups){
if (inGroup){
break;
}
for (int efg : ef.groups()){
if (g == efg){
inGroup = true;
annotationList.add(new Object[]{ef, f});
break;
}
}
}
}else{
annotationList.add(new Object[]{ef, f});
}
}
}
// Get annotation method
Method[] ms = cls.getDeclaredMethods();
for (Method m : ms){
ExcelField ef = m.getAnnotation(ExcelField.class);
if (ef != null && (ef.type()==0 || ef.type()==type)){
if (groups!=null && groups.length>0){
boolean inGroup = false;
for (int g : groups){
if (inGroup){
break;
}
for (int efg : ef.groups()){
if (g == efg){
inGroup = true;
annotationList.add(new Object[]{ef, m});
break;
}
}
}
}else{
annotationList.add(new Object[]{ef, m});
}
}
}
// Field sorting
Collections.sort(annotationList, new Comparator<Object[]>() {
public int compare(Object[] o1, Object[] o2) {
return new Integer(((ExcelField)o1[0]).sort()).compareTo(
new Integer(((ExcelField)o2[0]).sort()));
};
});
// Initialize
List<String> headerList = Lists.newArrayList();
for (Object[] os : annotationList){
String t = ((ExcelField)os[0]).title();
// 如果是导出，则去掉注释
if (type==1){
String[] ss = StringUtils.split(t, "**", 2);
if (ss.length==2){
t = ss[0];
}
}
headerList.add(t);
}
initialize(title, headerList);
}
/**
* 构造函数
* @param title 表格标题，传“空值”，表示无标题
* @param headers 表头数组
*/
public ExportExcel(String title, String[] headers) {
initialize(title, Lists.newArrayList(headers));
}
/**
* 构造函数
* @param title 表格标题，传“空值”，表示无标题
* @param headerList 表头列表
*/
public ExportExcel(String title, List<String> headerList) {
initialize(title, headerList);
}
/**
* 初始化函数
* @param title 表格标题，传“空值”，表示无标题
* @param headerList 表头列表
*/
private void initialize(String title, List<String> headerList) {
this.wb = new SXSSFWorkbook(500);
this.sheet = wb.createSheet("Export");
this.styles = createStyles(wb);
// Create title
if (StringUtils.isNotBlank(title)){
Row titleRow = sheet.createRow(rownum++);
titleRow.setHeightInPoints(30);
Cell titleCell = titleRow.createCell(0);
titleCell.setCellStyle(styles.get("title"));
titleCell.setCellValue(title);
sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(),
titleRow.getRowNum(), titleRow.getRowNum(), headerList.size()-1));
}
// Create header
if (headerList == null){
throw new RuntimeException("headerList not null!");
}
Row headerRow = sheet.createRow(rownum++);
headerRow.setHeightInPoints(16);
for (int i = 0; i < headerList.size(); i++) {
Cell cell = headerRow.createCell(i);
cell.setCellStyle(styles.get("header"));
String[] ss = StringUtils.split(headerList.get(i), "**", 2);
if (ss.length==2){
cell.setCellValue(ss[0]);
Comment comment = this.sheet.createDrawingPatriarch().createCellComment(
new XSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6));
comment.setString(new XSSFRichTextString(ss[1]));
cell.setCellComment(comment);
}else{
cell.setCellValue(headerList.get(i));
}
sheet.trackAllColumnsForAutoSizing();
sheet.autoSizeColumn(i);
}
for (int i = 0; i < headerList.size(); i++) {
int colWidth = sheet.getColumnWidth(i)*2;
sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth);
}
log.debug("Initialize success.");
}
/**
* 创建表格样式
* @param wb 工作薄对象
* @return 样式列表
*/
private Map<String, CellStyle> createStyles(Workbook wb) {
Map<String, CellStyle> styles = new HashMap<String, CellStyle>();
CellStyle style = wb.createCellStyle();
style.setAlignment(HorizontalAlignment.CENTER);
style.setVerticalAlignment(VerticalAlignment.CENTER);
Font titleFont = wb.createFont();
titleFont.setFontName("Arial");
titleFont.setFontHeightInPoints((short) 16);
titleFont.setBold(true);
style.setFont(titleFont);
styles.put("title", style);
style = wb.createCellStyle();
style.setVerticalAlignment(VerticalAlignment.CENTER);
style.setBorderRight(BorderStyle.THIN);
style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setBorderLeft(BorderStyle.THIN);
style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setBorderTop(BorderStyle.THIN);
style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setBorderBottom(BorderStyle.THIN);
style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
Font dataFont = wb.createFont();
dataFont.setFontName("Arial");
dataFont.setFontHeightInPoints((short) 10);
style.setFont(dataFont);
styles.put("data", style);
style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
style.setAlignment(HorizontalAlignment.LEFT);
styles.put("data1", style);
style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
style.setAlignment(HorizontalAlignment.CENTER);
styles.put("data2", style);
style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
style.setAlignment(HorizontalAlignment.RIGHT);
styles.put("data3", style);
style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
// style.setWrapText(true);
style.setAlignment(HorizontalAlignment.CENTER);
style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
Font headerFont = wb.createFont();
headerFont.setFontName("Arial");
headerFont.setFontHeightInPoints((short) 10);
headerFont.setBold(true);
headerFont.setColor(IndexedColors.WHITE.getIndex());
style.setFont(headerFont);
styles.put("header", style);
return styles;
}
/**
* 添加一行
* @return 行对象
*/
public Row addRow(){
return sheet.createRow(rownum++);
}
/**
* 添加一个单元格
* @param row 添加的行
* @param column 添加列号
* @param val 添加值
* @return 单元格对象
*/
public Cell addCell(Row row, int column, Object val){
return this.addCell(row, column, val, 0, Class.class);
}
/**
* 添加一个单元格
* @param row 添加的行
* @param column 添加列号
* @param val 添加值
* @param align 对齐方式（1：靠左；2：居中；3：靠右）
* @return 单元格对象
*/
public Cell addCell(Row row, int column, Object val, int align, Class<?> fieldType){
Cell cell = row.createCell(column);
// CellStyle style = styles.get("data"+(align>=1&&align<=3?align:""));
CellStyle style = styles.get("data_column_"+column);
String cellFormatString = "@";
try {
if (val == null){
cell.setCellValue("");
} else if (val instanceof String) {
cell.setCellValue((String) val);
} else if (val instanceof Integer) {
cell.setCellValue((Integer) val);
cellFormatString = "0";
//
// CellStyle styleInteger = cell.getCellStyle();
// styleInteger.setDataFormat(wb.createDataFormat().getFormat("0"));
} else if (val instanceof Long) {
cell.setCellValue((Long) val);
cellFormatString = "0";
} else if (val instanceof Double) {
cell.setCellValue((Double) val);
cellFormatString = "0.00";
} else if (val instanceof Float) {
cell.setCellValue((Float) val);
cellFormatString = "0.00";
} else if (val instanceof Date) {
// DataFormat format = wb.createDataFormat();
// CellStyle styleDate = cell.getCellStyle ();
// styleDate.cloneStyleFrom (style);
// style.setDataFormat(format.getFormat("yyyy-MM-dd"));
// cell.setCellValue((Date) styleDate);
cell.setCellValue((Date) val);
cellFormatString = "yyyy-MM-dd";
} else {
if (fieldType != Class.class){
cell.setCellValue((String)fieldType.getMethod("setValue", Object.class).invoke(null, val));
}else{
cell.setCellValue((String)Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(),
"fieldtype."+val.getClass().getSimpleName()+"Type")).getMethod("setValue", Object.class).invoke(null, val));
}
}
//处理数据格式问题
if (val != null){
if (style == null){
style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"+(align>=1&&align<=3?align:"")));
style.setDataFormat(wb.createDataFormat().getFormat(cellFormatString));
styles.put("data_column_" + column, style);
}
cell.setCellStyle(style);
}
} catch (Exception ex) {
log.info("Set cell value ["+row.getRowNum()+","+column+"] error: " + ex.toString());
cell.setCellValue(val.toString());
}
cell.setCellStyle(style);
return cell;
}
/**
* 添加数据（通过annotation.ExportField添加数据）
* @return list 数据列表
*/
public <E> ExportExcel setDataList(List<E> list){
for (E e : list){
int colunm = 0;
Row row = this.addRow();
StringBuilder sb = new StringBuilder();
for (Object[] os : annotationList){
ExcelField ef = (ExcelField)os[0];
Object val = null;
// Get entity value
try{
if (StringUtils.isNotBlank(ef.value())){
val = Reflections.invokeGetter(e, ef.value());
}else{
if (os[1] instanceof Field){
val = Reflections.invokeGetter(e, ((Field)os[1]).getName());
}else if (os[1] instanceof Method){
val = Reflections.invokeMethod(e, ((Method)os[1]).getName(), new Class[] {}, new Object[] {});
}
}
// If is dict, get dict label
if (StringUtils.isNotBlank(ef.dictType())){
val = DictUtils.getDictLabel(val==null?"":val.toString(), ef.dictType(), "");
}
}catch(Exception ex) {
// Failure to ignore
log.info(ex.toString());
val = "";
}
this.addCell(row, colunm++, val, ef.align(), ef.fieldType());
sb.append(val + ", ");
}
log.debug("Write success: ["+row.getRowNum()+"] "+sb.toString());
}
return this;
}
/**
* 输出数据流
* @param os 输出数据流
*/
public ExportExcel write(OutputStream os) throws IOException{
wb.write(os);
return this;
}
/**
* 输出到客户端
* @param fileName 输出文件名
*/
public ExportExcel write(HttpServletResponse response, String fileName) throws IOException{
response.reset();
response.setContentType("application/octet-stream; charset=utf-8");
response.setHeader("Content-Disposition", URLEncoder.encode(fileName, "UTF8"));
write(response.getOutputStream());
return this;
}
/**
* 输出到文件
* @param name 输出文件名
*/
public ExportExcel writeFile(String name) throws FileNotFoundException, IOException{
FileOutputStream os = new FileOutputStream(name);
this.write(os);
return this;
}
/**
* 清理临时文件
*/
public ExportExcel dispose(){
wb.dispose();
return this;
}
}3、导入Excel文件工具类
import com.google.common.collect.Lists;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
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;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
/**
* 导入Excel文件（支持“XLS”和“XLSX”格式）
*/
public class ImportExcel {
private static Logger log = LoggerFactory.getLogger(ImportExcel.class);
/**
* 工作薄对象
*/
private Workbook wb;
/**
* 工作表对象
*/
private Sheet sheet;
/**
* 标题行号
*/
private int headerNum;
/**
* 构造函数
* @param path 导入文件，读取第一个工作表
* @param headerNum 标题行号，数据行号=标题行号+1
* @throws InvalidFormatException
* @throws IOException
*/
public ImportExcel(String fileName, int headerNum)
throws InvalidFormatException, IOException {
this(new File(fileName), headerNum);
}
/**
* 构造函数
* @param path 导入文件对象，读取第一个工作表
* @param headerNum 标题行号，数据行号=标题行号+1
* @throws InvalidFormatException
* @throws IOException
*/
public ImportExcel(File file, int headerNum)
throws InvalidFormatException, IOException {
this(file, headerNum, 0);
}
/**
* 构造函数
* @param path 导入文件
* @param headerNum 标题行号，数据行号=标题行号+1
* @param sheetIndex 工作表编号
* @throws InvalidFormatException
* @throws IOException
*/
public ImportExcel(String fileName, int headerNum, int sheetIndex)
throws InvalidFormatException, IOException {
this(new File(fileName), headerNum, sheetIndex);
}
/**
* 构造函数
* @param path 导入文件对象
* @param headerNum 标题行号，数据行号=标题行号+1
* @param sheetIndex 工作表编号
* @throws InvalidFormatException
* @throws IOException
*/
public ImportExcel(File file, int headerNum, int sheetIndex)
throws InvalidFormatException, IOException {
this(file.getName(), new FileInputStream(file), headerNum, sheetIndex);
}
/**
* 构造函数
* @param file 导入文件对象
* @param headerNum 标题行号，数据行号=标题行号+1
* @param sheetIndex 工作表编号
* @throws InvalidFormatException
* @throws IOException
*/
public ImportExcel(MultipartFile multipartFile, int headerNum, int sheetIndex)
throws InvalidFormatException, IOException {
this(multipartFile.getOriginalFilename(), multipartFile.getInputStream(), headerNum, sheetIndex);
}
/**
* 构造函数
* @param path 导入文件对象
* @param headerNum 标题行号，数据行号=标题行号+1
* @param sheetIndex 工作表编号
* @throws InvalidFormatException
* @throws IOException
*/
public ImportExcel(String fileName, InputStream is, int headerNum, int sheetIndex)
throws InvalidFormatException, IOException {
if (StringUtils.isBlank(fileName)){
throw new RuntimeException("导入文档为空!");
}else if(fileName.toLowerCase().endsWith("xls")){
this.wb = new HSSFWorkbook(is);
}else if(fileName.toLowerCase().endsWith("xlsx")){
this.wb = new XSSFWorkbook(is);
}else{
throw new RuntimeException("文档格式不正确!");
}
if (this.wb.getNumberOfSheets()<sheetIndex){
throw new RuntimeException("文档中没有工作表!");
}
this.sheet = this.wb.getSheetAt(sheetIndex);
this.headerNum = headerNum;
log.debug("Initialize success.");
}
/**
* 获取行对象
* @param rownum
* @return
*/
public Row getRow(int rownum){
return this.sheet.getRow(rownum);
}
/**
* 获取数据行号
* @return
*/
public int getDataRowNum(){
return headerNum+1;
}
/**
* 获取最后一个数据行号
* @return
*/
public int getLastDataRowNum(){
return this.sheet.getLastRowNum()+headerNum;
}
/**
* 获取最后一个列号
* @return
*/
public int getLastCellNum(){
return this.getRow(headerNum).getLastCellNum();
}
/**
* 获取单元格值
* @param row 获取的行
* @param column 获取单元格列号
* @return 单元格值
*/
public Object getCellValue(Row row, int column) {
Object val = "";
try {
Cell cell = row.getCell(column);
if (cell != null) {
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
// val = cell.getNumericCellValue();
// 当excel 中的数据为数值或日期是需要特殊处理
if (HSSFDateUtil.isCellDateFormatted(cell)) {
double d = cell.getNumericCellValue();
Date date = HSSFDateUtil.getJavaDate(d);
SimpleDateFormat dformat = new SimpleDateFormat(
"yyyy-MM-dd");
val = dformat.format(date);
} else {
NumberFormat nf = NumberFormat.getInstance();
nf.setGroupingUsed(false);// true时的格式：1,234,567,890
val = nf.format(cell.getNumericCellValue());// 数值类型的数据为double，所以需要转换一下
}
} else if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
val = cell.getStringCellValue();
} else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
val = cell.getCellFormula();
} else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
val = cell.getBooleanCellValue();
} else if (cell.getCellType() == Cell.CELL_TYPE_ERROR) {
val = cell.getErrorCellValue();
}
}
} catch (Exception e) {
return val;
}
return val;
}
/**
* 获取导入数据列表
* @param cls 导入对象类型
* @param groups 导入分组
*/
public <E> List<E> getDataList(Class<E> cls, int... groups) throws InstantiationException, IllegalAccessException{
List<Object[]> annotationList = Lists.newArrayList();
// Get annotation field
Field[] fs = cls.getDeclaredFields();
for (Field f : fs){
ExcelField ef = f.getAnnotation(ExcelField.class);
if (ef != null && (ef.type()==0 || ef.type()==2)){
if (groups!=null && groups.length>0){
boolean inGroup = false;
for (int g : groups){
if (inGroup){
break;
}
for (int efg : ef.groups()){
if (g == efg){
inGroup = true;
annotationList.add(new Object[]{ef, f});
break;
}
}
}
}else{
annotationList.add(new Object[]{ef, f});
}
}
}
// Get annotation method
Method[] ms = cls.getDeclaredMethods();
for (Method m : ms){
ExcelField ef = m.getAnnotation(ExcelField.class);
if (ef != null && (ef.type()==0 || ef.type()==2)){
if (groups!=null && groups.length>0){
boolean inGroup = false;
for (int g : groups){
if (inGroup){
break;
}
for (int efg : ef.groups()){
if (g == efg){
inGroup = true;
annotationList.add(new Object[]{ef, m});
break;
}
}
}
}else{
annotationList.add(new Object[]{ef, m});
}
}
}
// Field sorting
Collections.sort(annotationList, new Comparator<Object[]>() {
public int compare(Object[] o1, Object[] o2) {
return new Integer(((ExcelField)o1[0]).sort()).compareTo(
new Integer(((ExcelField)o2[0]).sort()));
};
});
//log.debug("Import column count:"+annotationList.size());
// Get excel data
List<E> dataList = Lists.newArrayList();
for (int i = this.getDataRowNum(); i < this.getLastDataRowNum(); i++) {
E e = (E)cls.newInstance();
int column = 0;
Row row = this.getRow(i);
StringBuilder sb = new StringBuilder();
for (Object[] os : annotationList){
Object val = this.getCellValue(row, column++);
if (val != null){
ExcelField ef = (ExcelField)os[0];
// If is dict type, get dict value
if (StringUtils.isNotBlank(ef.dictType())){
val = DictUtils.getDictValue(val.toString(), ef.dictType(), "");
//log.debug("Dictionary type value: ["+i+","+colunm+"] " + val);
}
// Get param type and type cast
Class<?> valType = Class.class;
if (os[1] instanceof Field){
valType = ((Field)os[1]).getType();
}else if (os[1] instanceof Method){
Method method = ((Method)os[1]);
if ("get".equals(method.getName().substring(0, 3))){
valType = method.getReturnType();
}else if("set".equals(method.getName().substring(0, 3))){
valType = ((Method)os[1]).getParameterTypes()[0];
}
}
//log.debug("Import value type: ["+i+","+column+"] " + valType);
try {
//如果导入的java对象，需要在这里自己进行变换。
if (valType == String.class){
String s = String.valueOf(val.toString());
if(StringUtils.endsWith(s, ".0")){
val = StringUtils.substringBefore(s, ".0");
}else{
val = String.valueOf(val.toString());
}
}else if (valType == Integer.class){
val = Double.valueOf(val.toString()).intValue();
}else if (valType == Long.class){
val = Double.valueOf(val.toString()).longValue();
}else if (valType == Double.class){
val = Double.valueOf(val.toString());
}else if (valType == Float.class){
val = Float.valueOf(val.toString());
}else if (valType == Date.class){
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
val=sdf.parse(val.toString());
}else{
if (ef.fieldType() != Class.class){
val = ef.fieldType().getMethod("getValue", String.class).invoke(null, val.toString());
}else{
val = Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(),
"fieldtype."+valType.getSimpleName()+"Type")).getMethod("getValue", String.class).invoke(null, val.toString());
}
}
} catch (Exception ex) {
log.info("Get cell value ["+i+","+column+"] error: " + ex.toString());
val = null;
}
// set entity value
if (os[1] instanceof Field){
Reflections.invokeSetter(e, ((Field)os[1]).getName(), val);
}else if (os[1] instanceof Method){
String mthodName = ((Method)os[1]).getName();
if ("get".equals(mthodName.substring(0, 3))){
mthodName = "set"+StringUtils.substringAfter(mthodName, "get");
}
Reflections.invokeMethod(e, mthodName, new Class[] {valType}, new Object[] {val});
}
}
sb.append(val+", ");
}
dataList.add(e);
log.debug("Read success: ["+i+"] "+sb.toString());
}
return dataList;
}
}4、反射工具类
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;
import java.lang.reflect.*;
/**
* 反射工具类.
* 提供调用getter/setter方法, 访问私有变量, 调用私有方法, 获取泛型类型Class, 被AOP过的真实类等工具函数.
*/
@SuppressWarnings("rawtypes")
public class Reflections {
private static final String SETTER_PREFIX = "set";
private static final String GETTER_PREFIX = "get";
private static final String CGLIB_CLASS_SEPARATOR = "$$";
private static Logger logger = LoggerFactory.getLogger(Reflections.class);
/**
* 调用Getter方法.
* 支持多级，如：对象名.对象名.方法
*/
public static Object invokeGetter(Object obj, String propertyName) {
Object object = obj;
for (String name : StringUtils.split(propertyName, ".")){
String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(name);
object = invokeMethod(object, getterMethodName, new Class[] {}, new Object[] {});
}
return object;
}
/**
* 调用Setter方法, 仅匹配方法名。
* 支持多级，如：对象名.对象名.方法
*/
public static void invokeSetter(Object obj, String propertyName, Object value) {
Object object = obj;
String[] names = StringUtils.split(propertyName, ".");
for (int i=0; i<names.length; i++){
if(i<names.length-1){
String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(names[i]);
object = invokeMethod(object, getterMethodName, new Class[] {}, new Object[] {});
}else{
String setterMethodName = SETTER_PREFIX + StringUtils.capitalize(names[i]);
invokeMethodByName(object, setterMethodName, new Object[] { value });
}
}
}
/**
* 直接读取对象属性值, 无视private/protected修饰符, 不经过getter函数.
*/
public static Object getFieldValue(final Object obj, final String fieldName) {
Field field = getAccessibleField(obj, fieldName);
if (field == null) {
throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]");
}
Object result = null;
try {
result = field.get(obj);
} catch (IllegalAccessException e) {
logger.error("不可能抛出的异常{}", e.getMessage());
}
return result;
}
/**
* 直接设置对象属性值, 无视private/protected修饰符, 不经过setter函数.
*/
public static void setFieldValue(final Object obj, final String fieldName, final Object value) {
Field field = getAccessibleField(obj, fieldName);
if (field == null) {
throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]");
}
try {
field.set(obj, value);
} catch (IllegalAccessException e) {
logger.error("不可能抛出的异常:{}", e.getMessage());
}
}
/**
* 直接调用对象方法, 无视private/protected修饰符.
* 用于一次性调用的情况，否则应使用getAccessibleMethod()函数获得Method后反复调用.
* 同时匹配方法名+参数类型，
*/
public static Object invokeMethod(final Object obj, final String methodName, final Class<?>[] parameterTypes,
final Object[] args) {
Method method = getAccessibleMethod(obj, methodName, parameterTypes);
if (method == null) {
throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]");
}
try {
return method.invoke(obj, args);
} catch (Exception e) {
throw convertReflectionExceptionToUnchecked(e);
}
}
/**
* 直接调用对象方法, 无视private/protected修饰符，
* 用于一次性调用的情况，否则应使用getAccessibleMethodByName()函数获得Method后反复调用.
* 只匹配函数名，如果有多个同名函数调用第一个。
*/
public static Object invokeMethodByName(final Object obj, final String methodName, final Object[] args) {
Method method = getAccessibleMethodByName(obj, methodName);
if (method == null) {
throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]");
}
try {
return method.invoke(obj, args);
} catch (Exception e) {
throw convertReflectionExceptionToUnchecked(e);
}
}
/**
* 循环向上转型, 获取对象的DeclaredField, 并强制设置为可访问.
*
* 如向上转型到Object仍无法找到, 返回null.
*/
public static Field getAccessibleField(final Object obj, final String fieldName) {
Validate.notNull(obj, "object can't be null");
Validate.notBlank(fieldName, "fieldName can't be blank");
for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()) {
try {
Field field = superClass.getDeclaredField(fieldName);
makeAccessible(field);
return field;
} catch (NoSuchFieldException e) {//NOSONAR
// Field不在当前类定义,继续向上转型
continue;// new add
}
}
return null;
}
/**
* 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
* 如向上转型到Object仍无法找到, 返回null.
* 匹配函数名+参数类型。
*
* 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
*/
public static Method getAccessibleMethod(final Object obj, final String methodName,
final Class<?>... parameterTypes) {
Validate.notNull(obj, "object can't be null");
Validate.notBlank(methodName, "methodName can't be blank");
for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) {
try {
Method method = searchType.getDeclaredMethod(methodName, parameterTypes);
makeAccessible(method);
return method;
} catch (NoSuchMethodException e) {
// Method不在当前类定义,继续向上转型
continue;// new add
}
}
return null;
}
/**
* 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
* 如向上转型到Object仍无法找到, 返回null.
* 只匹配函数名。
*
* 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
*/
public static Method getAccessibleMethodByName(final Object obj, final String methodName) {
Validate.notNull(obj, "object can't be null");
Validate.notBlank(methodName, "methodName can't be blank");
for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) {
Method[] methods = searchType.getDeclaredMethods();
for (Method method : methods) {
if (method.getName().equals(methodName)) {
makeAccessible(method);
return method;
}
}
}
return null;
}
/**
* 改变private/protected的方法为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
*/
public static void makeAccessible(Method method) {
if ((!Modifier.isPublic(method.getModifiers()) || !Modifier.isPublic(method.getDeclaringClass().getModifiers()))
&& !method.isAccessible()) {
method.setAccessible(true);
}
}
/**
* 改变private/protected的成员变量为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
*/
public static void makeAccessible(Field field) {
if ((!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers()) || Modifier
.isFinal(field.getModifiers())) && !field.isAccessible()) {
field.setAccessible(true);
}
}
/**
* 通过反射, 获得Class定义中声明的泛型参数的类型, 注意泛型必须定义在父类处
* 如无法找到, 返回Object.class.
* eg.
* public UserDao extends HibernateDao<User>
*
* @param clazz The class to introspect
* @return the first generic declaration, or Object.class if cannot be determined
*/
@SuppressWarnings("unchecked")
public static <T> Class<T> getClassGenricType(final Class clazz) {
return getClassGenricType(clazz, 0);
}
/**
* 通过反射, 获得Class定义中声明的父类的泛型参数的类型.
* 如无法找到, 返回Object.class.
*
* 如public UserDao extends HibernateDao<User,Long>
*
* @param clazz clazz The class to introspect
* @param index the Index of the generic ddeclaration,start from 0.
* @return the index generic declaration, or Object.class if cannot be determined
*/
public static Class getClassGenricType(final Class clazz, final int index) {
Type genType = clazz.getGenericSuperclass();
if (!(genType instanceof ParameterizedType)) {
logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
return Object.class;
}
Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
if (index >= params.length || index < 0) {
logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: "
+ params.length);
return Object.class;
}
if (!(params[index] instanceof Class)) {
logger.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
return Object.class;
}
return (Class) params[index];
}
public static Class<?> getUserClass(Object instance) {
Assert.notNull(instance, "Instance must not be null");
Class clazz = instance.getClass();
if (clazz != null && clazz.getName().contains(CGLIB_CLASS_SEPARATOR)) {
Class<?> superClass = clazz.getSuperclass();
if (superClass != null && !Object.class.equals(superClass)) {
return superClass;
}
}
return clazz;
}
/**
* 将反射时的checked exception转换为unchecked exception.
*/
public static RuntimeException convertReflectionExceptionToUnchecked(Exception e) {
if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException
|| e instanceof NoSuchMethodException) {
return new IllegalArgumentException(e);
} else if (e instanceof InvocationTargetException) {
return new RuntimeException(((InvocationTargetException) e).getTargetException());
} else if (e instanceof RuntimeException) {
return (RuntimeException) e;
}
return new RuntimeException("Unexpected Checked Exception.", e);
}
}字典工具类DictUtils可直接将相关代码删除。
实现导入导出方法
首先在实体中将需要进行导入或导出的字段添加注解，该注解可控制排序、选择导入还是导出等功能，然后在控制层方法中引用导入导出工具类，一步完成导入导出。如下列示例：
1、在实体中注入自定义注解
@Data
public class RessExamInfoRelease extends DataEntity<RessExamInfoRelease> {
private static final long serialVersionUID = 1L;
// 考试日期
@ExcelField(title="日期", dictType="", align=2, sort=1)
private String examDate;
// 等级
@ExcelField(title="级别", dictType="", align=2, sort=2)
private String levelChin;
// 考试时间
@ExcelField(title="时间", dictType="", align=2, sort=3)
private String examTime;
// 考试地点
@ExcelField(title="地点", dictType="", align=2, sort=4)
private String place;
// 考试房间
@ExcelField(title="房间", dictType="", align=2, sort=5)
private String room;
// 考官名称，逗号分隔
@ExcelField(title="考官姓名", dictType="", align=2, sort=6)
private String teacherName;
// 邮箱，逗号分隔
@ExcelField(title="邮箱", dictType="", align=2, sort=7)
private String emails;
}2、控制层实现导出
@GetMapping("export")
public AjaxJson exportFile(RessExamInfoRelease ressExamInfoRelease, HttpServletRequest request, HttpServletResponse response) {
try {
String fileName = "考官信息"+ DateUtils.getDate("yyyyMMddHHmmss")+".xlsx";
// 数据库中查询出列表，以各自功能实现为准，略
Page<RessExamInfoRelease> page = ressExamInfoReleaseService.findExaminerPage(
new Page<RessExamInfoRelease>(request, response, -1), ressExamInfoRelease);
new ExportExcel("考官信息", RessExamInfoRelease.class).setDataList(page.getList()).write(response, fileName).dispose();
return null;
} catch (Exception e) {
return AjaxJson.error("导出考官信息记录失败！失败信息："+e.getMessage());
}
}3、控制层实现导入
@PostMapping("import")
public AjaxJson importFile(@RequestParam("file")MultipartFile file, HttpServletResponse response, HttpServletRequest request) {
try {
int successNum = 0;
int failureNum = 0;
StringBuilder failureMsg = new StringBuilder();
ImportExcel ei = new ImportExcel(file, 1, 0);
List<RessExamInfoRelease> list = ei.getDataList(RessExamInfoRelease.class);
for (RessExamInfoRelease ressExamInfoRelease: list){
try{
ressPeriodService.save(ressExamInfoRelease);
successNum++;
}catch(ConstraintViolationException ex){
failureNum++;
}catch (Exception ex) {
failureNum++;
}
}
if (failureNum>0){
failureMsg.insert(0, "，失败 "+failureNum+" 条记录。");
}
return AjaxJson.success( "已成功导入 "+successNum+" 条记录"+failureMsg);
} catch (Exception e) {
return AjaxJson.error("导入失败！失败信息："+e.getMessage());
}
}本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
