java的excel的导⼊导出前端与后台完整版的
1.我们要写⼀个注解ExcelField类。
@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.写⼀个导出Excel类
public class ExportExcel {
private static Logger log = Logger(ExportExcel.class);
/**
* ⼯作薄对象
*/
private SXSSFWorkbook wb;
/**
* ⼯作表对象
*/
private Sheet 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 = wArrayList();
/**
* 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, groups){        // Get annotation field
Field[] fs = DeclaredFields();
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 = DeclaredMethods();
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())pareTo(                        new Integer(((ExcelField)o2[0]).sort()));
};
});
// Initialize
List<String> headerList = wArrayList();
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);
前端页面模板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, wArrayList(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 = ateRow(rownum++);
titleRow.setHeightInPoints(30);
Cell titleCell = ateCell(0);
titleCell.("title"));
titleCell.setCellValue(title);
sheet.addMergedRegion(new RowNum(),
}
// Create header
if (headerList == null){
throw new RuntimeException("headerList not null!");
}
Row headerRow = ateRow(rownum++);
headerRow.setHeightInPoints(16);
for (int i = 0; i < headerList.size(); i++) {
Cell cell = ateCell(i);
cell.("header"));
String[] ss = StringUtils.(i), "**", 2);
if (ss.length==2){
cell.setCellValue(ss[0]);
Comment comment = ateDrawingPatriarch().createCellComment(                        new XSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6));
comment.setString(new XSSFRichTextString(ss[1]));
cell.setCellComment(comment);
}else{
cell.(i));
}
sheet.autoSizeColumn(i);
}
for (int i = 0; i < headerList.size(); i++) {
int colWidth = ColumnWidth(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(CellStyle.ALIGN_CENTER);
style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
Font titleFont = wb.createFont();
titleFont.setFontName("Arial");
titleFont.setFontHeightInPoints((short) 16);
titleFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
style.setFont(titleFont);
styles.put("title", style);
style = wb.createCellStyle();
style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
style.setBorderRight(CellStyle.BORDER_THIN);
style.setRightBorderColor(IndexedColors.GREY_Index());        style.setBorderLeft(CellStyle.BORDER_THIN);
style.setLeftBorderColor(IndexedColors.GREY_Index());
style.setBorderTop(CellStyle.BORDER_THIN);
style.setTopBorderColor(IndexedColors.GREY_Index());
style.setBorderBottom(CellStyle.BORDER_THIN);
style.setBottomBorderColor(IndexedColors.GREY_Index());        Font dataFont = wb.createFont();
dataFont.setFontName("Arial");
dataFont.setFontHeightInPoints((short) 10);
style.setFont(dataFont);
styles.put("data", style);
style = wb.createCellStyle();
style.("data"));
style.setAlignment(CellStyle.ALIGN_LEFT);
styles.put("data1", style);
style = wb.createCellStyle();
style.("data"));
style.setAlignment(CellStyle.ALIGN_CENTER);
styles.put("data2", style);

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