这里需要用到poi的jar包。需要自行下载.
/*这个类的目的是封装了javabean导出execl*/
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Set;
import java.util.Map.Entry;
import org.apache.poi.hssf.usermodel.HSSFCell;
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.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.util.CellRangeAddress;
public class ExcelUtil {
private static HSSFWorkbook wb;
private static CellStyle titleStyle; // 标题行样式
private static Font titleFont; // 标题行字体
private static CellStyle dateStyle; // 日期行样式
private static Font dateFont; // 日期行字体
private static CellStyle headStyle; // 表头行样式
private static Font headFont; // 表头行字体
private static CellStyle contentStyle; // 内容行样式
private static Font contentFont; // 内容行字体
/**
* 导出到流
*
* @param setInfo
* @return
* @throws Exception
*/
public static void export2Stream(ExcelExportData setInfo,OutputStream out)
throws Exception {
init();
Set<Entry<String, List<?>>> set = setInfo.getDataMap().entrySet();
String[] sheetNames = new String[setInfo.getDataMap().size()];
int sheetNameNum = 0;
for (Entry<String, List<?>> entry : set) {
sheetNames[sheetNameNum] = entry.getKey();
sheetNameNum++;
}
HSSFSheet[] sheets = getSheets(setInfo.getDataMap().size(), sheetNames);
int sheetNum = 0;
for (Entry<String, List<?>> entry : set) {
// Sheet
List<?> objs = entry.getValue();
// 标题行
createTableTitleRow(setInfo, sheets, sheetNum);
// 日期行
createTableDateRow(setInfo, sheets, sheetNum);
// 表头
creatTableHeadRow(setInfo, sheets, sheetNum);
// 表体
String[] fieldNames = setInfo.getFieldNames().get(sheetNum);
int rowNum = 3;
for (Object obj : objs) {
HSSFRow contentRow = sheets[sheetNum].createRow(rowNum);
contentRow.setHeight((short) 300);
HSSFCell[] cells = getCells(contentRow, setInfo.getFieldNames()
.get(sheetNum).length);
int cellNum = 1; // 去掉一列序号，因此从1开始
if (fieldNames != null) {
for (int num = 0; num < fieldNames.length; num++) {
Object value = ReflectionUtil.invokeGetterMethod(obj,
fieldNames[num]);
cells[cellNum].setCellValue(value == null ? "" : value
.toString());
cellNum++;
}
}
rowNum++;
}
adjustColumnSize(sheets, sheetNum, fieldNames); // 自动调整列宽
sheetNum++;
}
wb.write(out);
}
/**
* @Description: 初始化
*/
private static void init() {
wb = new HSSFWorkbook();
titleFont = wb.createFont();
titleStyle = wb.createCellStyle();
dateStyle = wb.createCellStyle();
dateFont = wb.createFont();
headStyle = wb.createCellStyle();
headFont = wb.createFont();
contentStyle = wb.createCellStyle();
contentFont = wb.createFont();
initTitleCellStyle();
initTitleFont();
initDateCellStyle();
initDateFont();
initHeadCellStyle();
initHeadFont();
initContentCellStyle();
initContentFont();
}
/**
* @Description: 自动调整列宽
*/
private static void adjustColumnSize(HSSFSheet[] sheets, int sheetNum,
String[] fieldNames) {
for (int i = 0; i < fieldNames.length + 1; i++) {
sheets[sheetNum].autoSizeColumn(i, true);
}
}
/**
* @Description: 创建标题行(需合并单元格)
*/
private static void createTableTitleRow(ExcelExportData setInfo,
HSSFSheet[] sheets, int sheetNum) {
CellRangeAddress titleRange = new CellRangeAddress(0, 0, 0, setInfo
.getFieldNames().get(sheetNum).length);
sheets[sheetNum].addMergedRegion(titleRange);
HSSFRow titleRow = sheets[sheetNum].createRow(0);
titleRow.setHeight((short) 800);
HSSFCell titleCell = titleRow.createCell(0);
titleCell.setCellStyle(titleStyle);
titleCell.setCellValue(setInfo.getTitles()[sheetNum]);
}
/**
* @Description: 创建日期行(需合并单元格)
*/
private static void createTableDateRow(ExcelExportData setInfo,
HSSFSheet[] sheets, int sheetNum) {
CellRangeAddress dateRange = new CellRangeAddress(1, 1, 0, setInfo
.getFieldNames().get(sheetNum).length);
sheets[sheetNum].addMergedRegion(dateRange);
HSSFRow dateRow = sheets[sheetNum].createRow(1);
dateRow.setHeight((short) 350);
HSSFCell dateCell = dateRow.createCell(0);
dateCell.setCellStyle(dateStyle);
// dateCell.setCellValue("导出时间：" + new
// SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
// .format(new Date()));
dateCell.setCellValue(new SimpleDateFormat("yyyy-MM-dd")
.format(new Date()));
}
/**
* @Description: 创建表头行(需合并单元格)
*/
private static void creatTableHeadRow(ExcelExportData setInfo,
HSSFSheet[] sheets, int sheetNum) {
// 表头
HSSFRow headRow = sheets[sheetNum].createRow(2);
headRow.setHeight((short) 350);
// 序号列
HSSFCell snCell = headRow.createCell(0);
snCell.setCellStyle(headStyle);
snCell.setCellValue("序号");
// 列头名称
for (int num = 1, len = setInfo.getColumnNames().get(sheetNum).length; num <= len; num++) {
HSSFCell headCell = headRow.createCell(num);
headCell.setCellStyle(headStyle);
headCell.setCellValue(setInfo.getColumnNames().get(sheetNum)[num - 1]);
}
}
/**
* @Description: 创建所有的Sheet
*/
private static HSSFSheet[] getSheets(int num, String[] names) {
HSSFSheet[] sheets = new HSSFSheet[num];
for (int i = 0; i < num; i++) {
sheets[i] = wb.createSheet(names[i]);
}
return sheets;
}
/**
* @Description: 创建内容行的每一列(附加一列序号)
*/
private static HSSFCell[] getCells(HSSFRow contentRow, int num) {
HSSFCell[] cells = new HSSFCell[num + 1];
for (int i = 0, len = cells.length; i < len; i++) {
cells[i] = contentRow.createCell(i);
cells[i].setCellStyle(contentStyle);
}
// 设置序号列值，因为出去标题行和日期行，所有-2
cells[0].setCellValue(contentRow.getRowNum() - 2);
return cells;
}
/**
* @Description: 初始化标题行样式
*/
private static void initTitleCellStyle() {
titleStyle.setAlignment(CellStyle.ALIGN_CENTER);
titleStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
titleStyle.setFont(titleFont);
titleStyle.setFillBackgroundColor(IndexedColors.SKY_BLUE.index);
}
/**
* @Description: 初始化日期行样式
*/
private static void initDateCellStyle() {
dateStyle.setAlignment(CellStyle.ALIGN_CENTER_SELECTION);
dateStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
dateStyle.setFont(dateFont);
dateStyle.setFillBackgroundColor(IndexedColors.SKY_BLUE.index);
}
/**
* @Description: 初始化表头行样式
*/
private static void initHeadCellStyle() {
headStyle.setAlignment(CellStyle.ALIGN_CENTER);
headStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
headStyle.setFont(headFont);
headStyle.setFillBackgroundColor(IndexedColors.YELLOW.index);
headStyle.setBorderTop(CellStyle.BORDER_MEDIUM);
headStyle.setBorderBottom(CellStyle.BORDER_THIN);
headStyle.setBorderLeft(CellStyle.BORDER_THIN);
headStyle.setBorderRight(CellStyle.BORDER_THIN);
headStyle.setTopBorderColor(IndexedColors.BLUE.index);
headStyle.setBottomBorderColor(IndexedColors.BLUE.index);
headStyle.setLeftBorderColor(IndexedColors.BLUE.index);
headStyle.setRightBorderColor(IndexedColors.BLUE.index);
}
/**
* @Description: 初始化内容行样式
*/
private static void initContentCellStyle() {
contentStyle.setAlignment(CellStyle.ALIGN_CENTER);
contentStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
contentStyle.setFont(contentFont);
contentStyle.setBorderTop(CellStyle.BORDER_THIN);
contentStyle.setBorderBottom(CellStyle.BORDER_THIN);
contentStyle.setBorderLeft(CellStyle.BORDER_THIN);
contentStyle.setBorderRight(CellStyle.BORDER_THIN);
contentStyle.setTopBorderColor(IndexedColors.BLUE.index);
contentStyle.setBottomBorderColor(IndexedColors.BLUE.index);
contentStyle.setLeftBorderColor(IndexedColors.BLUE.index);
contentStyle.setRightBorderColor(IndexedColors.BLUE.index);
contentStyle.setWrapText(true); // 字段换行
}
/**
* @Description: 初始化标题行字体
*/
private static void initTitleFont() {
titleFont.setFontName("华文楷体");
titleFont.setFontHeightInPoints((short) 20);
titleFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
titleFont.setCharSet(Font.DEFAULT_CHARSET);
titleFont.setColor(IndexedColors.BLUE_GREY.index);
}
/**
* @Description: 初始化日期行字体
*/
private static void initDateFont() {
dateFont.setFontName("隶书");
dateFont.setFontHeightInPoints((short) 10);
dateFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
dateFont.setCharSet(Font.DEFAULT_CHARSET);
dateFont.setColor(IndexedColors.BLUE_GREY.index);
}
/**
* @Description: 初始化表头行字体
*/
private static void initHeadFont() {
headFont.setFontName("宋体");
headFont.setFontHeightInPoints((short) 10);
headFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
headFont.setCharSet(Font.DEFAULT_CHARSET);
headFont.setColor(IndexedColors.BLUE_GREY.index);
}
/**
* @Description: 初始化内容行字体
*/
private static void initContentFont() {
contentFont.setFontName("宋体");
contentFont.setFontHeightInPoints((short) 10);
contentFont.setBoldweight(Font.BOLDWEIGHT_NORMAL);
contentFont.setCharSet(Font.DEFAULT_CHARSET);
contentFont.setColor(IndexedColors.BLUE_GREY.index);
}
/**
* Excel导出数据类
*
* @author jimmy
*
*/
public static class ExcelExportData {
/**
* 导出数据 key:String 表示每个Sheet的名称 value:List<?> 表示每个Sheet里的所有数据行
*/
private LinkedHashMap<String, List<?>> dataMap;
/**
* 每个Sheet里的顶部大标题
*/
private String[] titles;
/**
* 单个sheet里的数据列标题
*/
private List<String[]> columnNames;
/**
* 单个sheet里每行数据的列对应的对象属性名称
*/
private List<String[]> fieldNames;
public List<String[]> getFieldNames() {
return fieldNames;
}
public void setFieldNames(List<String[]> fieldNames) {
this.fieldNames = fieldNames;
}
public String[] getTitles() {
return titles;
}
public void setTitles(String[] titles) {
this.titles = titles;
}
public List<String[]> getColumnNames() {
return columnNames;
}
public void setColumnNames(List<String[]> columnNames) {
this.columnNames = columnNames;
}
public LinkedHashMap<String, List<?>> getDataMap() {
return dataMap;
}
public void setDataMap(LinkedHashMap<String, List<?>> dataMap) {
this.dataMap = dataMap;
}
}
}/*这个类的目的是封装了javabean导出
