java poi生成excel文件_java poi 导出Excel文件
1，導包 ?poi-3.9-XXX.JAR
2, 創建一個實體對象
public class Student implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private int id;
private String name;
private int age;
private Date borth;
public Student(int id, String name, int age, Date borth){
this.id = id;
this.name = name;
this.age = age;
this.borth = borth;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getBorth() {
return borth;
}
public void setBorth(Date borth) {
this.borth = borth;
}
public static long getSerialversionuid() {
return serialVersionUID;
}
3，創建實體數據，也可以獲取數據庫的信息
public class StuData {
public static List> getStuInfo() throws ParseException {
List> listStuInfo = new ArrayList>();
List listStu = new ArrayList();
DateFormat format = new SimpleDateFormat("yyyy-mm-dd");
Student s1 = new Student(1, "zhangsan", 16, format.parse("1987-05-06"));
Student s2 = new Student(2, "li", 17, format.parse("1988-05-06"));
Student s3 = new Student(3, "wangwu", 18, format.parse("1989-05-06"));
Student s4 = new Student(4, "zhaoliu", 19, format.parse("1990-05-06"));
listStu.add(s1);
listStu.add(s2);
listStu.add(s3);
listStu.add(s4);
for (Student stu : listStu) {
Map map = new HashMap();
map.put("id", stu.getId());
map.put("name", stu.getName());
map.put("age", stu.getAge());
map.put("borth", stu.getBorth());
listStuInfo.add(map);
}
return listStuInfo;
}
}
4, 創建表頭，以及單元格的樣式等
private static Map createHeaderInfo(Workbook wb, Sheet sheet, int headerNumber) {
Row row = sheet.createRow(headerNumber);
Map header = createHeader();
for(String str : header.keySet()) {
int rowNumber = (int) header.get(str);
Cell cell = row.createCell(rowNumber);
CellStyle cellstyle = wb.createCellStyle();
cellstyle.setAlignment(CellStyle.ALIGN_CENTER);
Font font = wb.createFont();
font.setBoldweight(Font.BOLDWEIGHT_BOLD);
cellstyle.setFont(font);
cell.setCellStyle(cellstyle);
cell.setCellValue(str);
}
headerNumber++;
return header;
}
5，表頭信息：
private static Map createHeader(){
Map header = new HashMap();
header.put("id", 0);
header.put("name", 1);
header.put("age", 2);
header.put("borth", 3);
return header;
}
6，創建Excel對象，創建sheet頁簽，創建行，創建每行的單元格
public static void main(String[] args) throws ParseException, IOException {
Workbook wb = new HSSFWorkbook();
Sheet sheet = wb.createSheet("StuInfo");
//創建表頭
int rowNumber = 0 ;
Map header = createHeaderInfo(wb, sheet, rowNumber);
List> listStuInfo = StuData.getStuInfo();
for(Map stuMap : listStuInfo) {
rowNumber++;
Row row = sheet.createRow(rowNumber);
Iterator> iterator = header.entrySet().iterator();
while(iterator.hasNext()){
Entry entry = iterator.next();
String headerCell = entry.getKey();
int cellNumber = (int) entry.getValue();
Cell cell = row.createCell(cellNumber);
CellStyle cellstyle = wb.createCellStyle();
cellstyle.setAlignment(CellStyle.ALIGN_CENTER);
cell.setCellStyle(cellstyle);
Object value = stuMap.get(headerCell);
if(value instanceof String) {
cell.setCellValue((String)value);
}else if(value instanceof Date){
cell.setCellValue(((Date) value).toLocaleString());
}else if(value instanceof Integer){
cell.setCellValue((Double.valueOf(value.toString())));
}
}
}
FileOutputStream fos = new FileOutputStream("E:/studentInfo.xlsx");
wb.write(fos);
fos.flush();
fos.close();
System.out.println("OK");
}
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