java使用POI工具类导出excel

POI导出excel

1.导入maven依赖

        <dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>4.0.1</version></dependency>

2.工具类

ExcelEntity.java

/*** 代表要打印的Excel表格,用于存放要导出为Excel的相关数据** @param <T> 代表要打印的数据实体，如User等* @author zhrb@cec.jmu*/
public class ExcelEntity<T> {private String sheetName;//默认生成的sheet名称private String header;//题头private String footer;//脚注//底下是必须具备的属性private String fileName;private String[] columnNames;//列名private String[] methodNames;//与列名对应的方法名private List<T> entities;//数据实体

public ExcelEntity(String fileName, String[] columnNames, String[] methodNames, List<T> entities) {this("sheet1", "", "", fileName, columnNames, methodNames, entities);}
public ExcelEntity(String sheetName, String header, String footer, String fileName, String[] columnNames,String[] methodNames, List<T> entities) {
this.sheetName = sheetName;this.header = header;this.footer = footer;this.fileName = fileName;this.columnNames = columnNames;this.methodNames = methodNames;this.entities = entities;}
public String getHeader() {return header;}
public void setHeader(String header) {this.header = header;}
public String getSheetName() {return sheetName;}
public void setSheetName(String sheetName) {this.sheetName = sheetName;}
public List<T> getEntities() {return entities;}
/*** @param entities 用于导出Excel的实体集合*/public void setEntities(List<T> entities) {this.entities = entities;}
public String getFooter() {return footer;}
public void setFooter(String footer) {this.footer = footer;}
public String[] getColumnNames() {return columnNames;}
public void setColumnNames(String[] columnNames) {this.columnNames = columnNames;}
public String getFileName() {return fileName;}
public void setFileName(String fileName) {this.fileName = fileName;}
public String[] getMethodNames() {return methodNames;}
public void setMethodNames(String[] methodNames) {this.methodNames = methodNames;}
}

ExcelExporter.java

public class ExcelExporter {/*** 根据ExcelEntity等参数生成Workbook** @param entity* @return* @throws Exception*/public static <T> Workbook export2Excel(ExcelEntity<T> entity) throws Exception {Workbook workbook = export2Excel(entity.getHeader(), entity.getFooter(), entity.getSheetName(), entity.getColumnNames(), entity.getMethodNames(),entity.getEntities());return workbook;}

/*** 根据给定参数导出Excel文档** @param headerTitle 题头* @param sheetName* @param columnNames 表头名称* @param methodNames* @param entities* @return* @throws Exception*/public static <T> Workbook export2Excel(String headerTitle, String footerTitle, String sheetName, String[] columnNames,String[] methodNames, List<T> entities) throws Exception {if (methodNames.length != columnNames.length) {throw new IllegalArgumentException("methodNames.length should be equal to columnNames.length:"+ columnNames.length + " " + methodNames.length);}Workbook newWorkBook2007 = new XSSFWorkbook();Sheet sheet = newWorkBook2007.createSheet(sheetName);//设置题头Header header = sheet.getHeader();header.setCenter(headerTitle);//设置脚注Footer footer = sheet.getFooter();footer.setCenter(footerTitle);
int[] columnWidths = new int[columnNames.length];// 创建表头createTableHeader(sheet, 0, headerTitle, columnNames, columnWidths);// 填充表内容createTableContent(sheet, 1, methodNames, columnWidths, entities);
return newWorkBook2007;
}
/*** 创建表头** @param sheet* @param index        表头开始的行数* @param headerTitle  题头* @param columnNames* @param columnWidths*/private static void createTableHeader(Sheet sheet, int index, String headerTitle, String[] columnNames,int[] columnWidths) {

Row headerRow = sheet.createRow(index);
/* 格式设置 */// 设置字体Font font = sheet.getWorkbook().createFont();font.setBold(true);// 粗体显示// 设置背景色CellStyle style = sheet.getWorkbook().createCellStyle();style.setFillForegroundColor(IndexedColors.PALE_BLUE.getIndex());style.setFillPattern(FillPatternType.SOLID_FOREGROUND);style.setFont(font);
for (int i = 0; i < columnNames.length; i++) {Cell headerCell = headerRow.createCell(i);headerCell.setCellStyle(style);headerCell.setCellValue(columnNames[i]);}
for (int i = 0; i < columnNames.length; i++) {columnWidths[i] = (columnNames[i].getBytes().length + 2) * 256;sheet.setColumnWidth(i, columnWidths[i]);}
}
/*** 创建表格内容** @param sheet* @param rowIndexBegin 表内容开始的行数* @param methodNames   T对象的方法名* @param columnWidths* @param entities* @throws Exception*/private static <T> void createTableContent(Sheet sheet, int rowIndexBegin, String[] methodNames, int[] columnWidths,List<T> entities) throws Exception {Class<? extends Object> clazz = null;if (entities.size() > 0) {clazz = entities.get(0).getClass();}String content;for (T t : entities) {Row row = sheet.createRow(rowIndexBegin++);for (int i = 0; i < methodNames.length; i++) {Cell cell = row.createCell(i);Method method = clazz.getMethod(methodNames[i], null);Object object = method.invoke(t, null);object = object == null ? "" : object;if (object.getClass().equals(Date.class)) {// 对日期格式进行特殊处理SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");content = sdf.format((Date) object);cell.setCellValue(content);} /*else if (object.getClass().equals(Timestamp.class)){//对时间戳进行特殊处理Date d = new Date();} */ else {content = object.toString();cell.setCellValue(content);}int columnWidth = (content.getBytes().length + 2) * 256;if (columnWidth > columnWidths[i]) {// 如果实际内容宽度大于对应的表头宽度，则设置为实际内容宽度columnWidths[i] = columnWidth;sheet.setColumnWidth(i, columnWidths[i]);}
}}}

/*** 将workbook2007存为文件** @param workbook2007* @param dstFile*/public static void saveWorkBook2007(Workbook workbook2007, String dstFile) {File file = new File(dstFile);OutputStream os = null;try {os = new FileOutputStream(file);workbook2007.write(os);} catch (IOException e) {e.printStackTrace();} finally {if (os != null) {try {os.close();} catch (IOException e) {System.out.println(e);}}}}

}

3.测试

创建测试实体类

Hero.java

public class Hero {private String name;private Integer age;
public String getName() {return name;}
public void setName(String name) {this.name = name;}
public Integer getAge() {return age;}
public void setAge(Integer age) {this.age = age;}
}

Wind.java

public class Wind {private String location;private Integer speed;private Date Timestamp;
public String getLocation() {return location;}
public void setLocation(String location) {this.location = location;}
public Integer getSpeed() {return speed;}
public void setSpeed(Integer speed) {this.speed = speed;}
public Date getTimestamp() {return Timestamp;}
public void setTimestamp(Date timestamp) {Timestamp = timestamp;}
}

测试导出excel文件

    public static void main(String[] args) throws Exception {
// 准备数据List<Wind> winds = new ArrayList<>();// Wind有三个方法:getLocation、getSpeed、getTimestampfor (int i = 0; i < 10; i++) {Wind wind = new Wind();wind.setLocation(i + "");wind.setSpeed(i * 10);wind.setTimestamp(new Date());winds.add(wind);}String[] columnNames = {"地点", "速度", "时间"};String[] methodNames = {"getLocation", "getSpeed", "getTimestamp"};
//      String fileName = "d:/temp/excel1.xlsx";String fileName = "/Users/apple/Documents/test.xlsx";// 生成ExcelEntity实体，包含4个必备参数ExcelEntity<Wind> excelEntity = new ExcelEntity<>(fileName, columnNames, methodNames, winds);//excelEntity.setHeader("题头");//excelEntity.setFooter("脚注");Workbook excel = ExcelExporter.export2Excel(excelEntity);//ExcelExporter.export2Excel("题头","脚注", "sheet1", columnNames, methodNames, winds);//也可以这样调用,无需新建ExcelEntity对象//将Workbook存为文件ExcelExporter.saveWorkBook2007(excel, excelEntity.getFileName());
System.out.println("导出完成！");}

生成如下excel文件

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java使用POI工具类导出excel

POI导出excel

1.导入maven依赖

2.工具类

3.测试

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