JXL导出Excel工具类---（1）简单思路
简单介绍
项目中经常有Excel报表生成和Html文件生成，对于不同的Excel样式，都还花部分时间去调样式，工作耗时耗力并且代码还杂乱无章，所以有了封装工具类的想法。
Excel常用样式汇总
根据常用的Excel模板，把单元格的情况，分为以下几种情况：
- 普通的Excel单元格
- 存在按列合并单元格
- 存在按行合并单元格
- 存在多行的单元格，把A事情、B事情和C事情看为一个整体。
工具类思路
采用PieceData类封装4种单元格类型，多个PieceData就能组成为一行，多行就能组成一个Sheet页。
部分代码如下：
/**
* PieceData类实现4种单元格类型
* 1，普通型 1*1 值只有一个
* 2，合并列型 1*n 值只有一个
* 3，合并行型 n*1 值只有一个
* 4，多行型 n*1 值有多个
*
* 类采用创建者模式进行生成，防止写多个构造函数
**/
@Data
public class PieceData {
private List<String> pieceValue;
private Integer rowSize;
private Integer columnSize;
private Type type;
public String getSingleValue() {
if (pieceValue == null || pieceValue.size() == 0) {
return "";
} else {
return pieceValue.get(0);
}
}
PieceData(Builder builder) {
this.pieceValue = builder.pieceValue;
this.rowSize = builder.rowSize;
this.columnSize = builder.columnSize;
this.type = builder.type;
}
@Data
@Accessors(chain = true)
public static class Builder {
private List<String> pieceValue;
private Integer rowSize = 1;
private Integer columnSize = 1;
private Type type;
public PieceData build() {
if (pieceValue.size() > 1) {
type = Type.MORE_ROWS;
rowSize = pieceValue.size();
} else if (columnSize == 1 && rowSize == 1) {
type = Type.NORMAL;
} else if (columnSize > 1) {
type = Type.MERGE_COLUMNS;
} else if (rowSize > 1) {
type = Type.MERGE_ROWS;
}
return new PieceData(this);
}
//屏幕Type类型进行赋值
private void setType(Type type) {
}
}
public enum Type {
NORMAL,
MERGE_COLUMNS,
MERGE_ROWS,
MORE_ROWS
}
}行的类型封装ExcelRow
/**
* 对一行数据进行封装
* 包括该行的状态（最大行数，最大列数），以及每个单元格的信息
*
**/
@Getter
@Accessors(chain = true)
public class ExcelRow {
private RowStatus status = new RowStatus();
List<PieceData> pieceDataList = new ArrayList<>();
public void addPieceData(PieceData pieceData) {
pieceDataList.add(pieceData);
status.setMaxRow(status.getMaxRow().compareTo(pieceData.getRowSize()) > 0 ? status.getMaxRow() : pieceData.getRowSize());
status.setMaxColumn(status.getMaxColumn().compareTo(pieceData.getColumnSize()) > 0 ? status.getMaxColumn() : pieceData.getColumnSize());
}
public void setRevise(boolean isRevise) {
status.setRevise(isRevise);
}
public Integer getMaxRow() {
return status.getMaxRow();
}
public Integer getMaxColumn() {
return status.getMaxColumn();
}
}/**
* RowStatus类
* 主要记录该行最大行数，最大列数，是否需要自适应
*
**/
@Data
public class RowStatus {
private Integer maxRow = 0;
private Integer maxColumn = 0;
// 默认为自适应的修正
private boolean isRevise = true;
}生成类包括如下：
WritableWorkbook workbook = Workbook.createWorkbook(new File("X"));
workbook.createSheet(sheetName, sheetNum);
WritableSheet sheet = workbook.getSheet(0);
int rowNum = 0;
for (ExcelRow header : headerRows) {
int column = 0;
for (PieceData piece : header.getPieceDataList()) {
writeCellData(sheet, piece, rowNum, column, header.getStatus());
column += piece.getColumnSize();
}
rowNum += header.getMaxRow();
}
workbook.write();
workbook.close();
// 根据不同的单元格类型进行处理
private void writeCellData(WritableSheet sheet, PieceData pieceData, int startRow, int startColumn, RowStatus status) {
try {
switch (pieceData.getType()) {
case NORMAL:
sheet.addCell(new Label(startColumn, startRow, pieceData.getSingleValue()));
if (status.isRevise() && status.getMaxRow().compareTo(pieceData.getRowSize()) > 0) {
sheet.mergeCells(startColumn, startRow, startColumn, startRow + status.getMaxRow() - 1);
}
break;
case MERGE_ROWS:
sheet.addCell(new Label(startColumn, startRow, pieceData.getSingleValue()));
if (status.isRevise() && status.getMaxRow().compareTo(pieceData.getRowSize()) > 0) {
sheet.mergeCells(startColumn, startRow, startColumn, startRow + status.getMaxRow() - 1);
} else {
sheet.mergeCells(startColumn, startRow, startColumn, startRow + pieceData.getRowSize() - 1);
}
break;
case MERGE_COLUMNS:
sheet.addCell(new Label(startColumn, startRow, pieceData.getSingleValue()));
if (status.isRevise() && status.getMaxRow().compareTo(pieceData.getRowSize()) > 0) {
sheet.mergeCells(startColumn, startRow, startColumn + pieceData.getColumnSize() - 1, startRow + status.getMaxRow() - 1);
} else {
sheet.mergeCells(startColumn, startRow, startColumn + pieceData.getColumnSize() - 1, startRow);
}
break;
case MORE_ROWS:
for (int i = 0; i < pieceData.getRowSize(); i++) {
sheet.addCell(new Label(startColumn, startRow + i, pieceData.getPieceValue().get(i)));
}
break;
default:
break;
}
} catch (WriteException e) {
e.printStackTrace();
}
}Demo样式
public static void main(String[] args) {
List<ExcelRow> excelRows = new ArrayList<>();
ExcelRow row1 = new ExcelRow();
row1.addPieceData(new PieceData.Builder().setPieceValue(Collections.singletonList("A")).build());
row1.addPieceData(new PieceData.Builder().setPieceValue(Collections.singletonList("B")).build());
row1.addPieceData(new PieceData.Builder().setPieceValue(Collections.singletonList("C")).setColumnSize(2).build());
row1.addPieceData(new PieceData.Builder().setPieceValue(Collections.singletonList("D")).setRowSize(2).build());
row1.addPieceData(new PieceData.Builder().setPieceValue(Arrays.asList("E", "F", "G")).build());
ExcelRow row2 = new ExcelRow();
row2.addPieceData(new PieceData.Builder().setPieceValue(Collections.singletonList("A")).build());
row2.addPieceData(new PieceData.Builder().setPieceValue(Collections.singletonList("B")).build());
row2.addPieceData(new PieceData.Builder().setPieceValue(Collections.singletonList("C")).setColumnSize(2).build());
row2.addPieceData(new PieceData.Builder().setPieceValue(Collections.singletonList("D")).setRowSize(2).build());
row2.addPieceData(new PieceData.Builder().setPieceValue(Arrays.asList("E", "F", "G")).build());
excelRows.add(row1);
excelRows.add(row2);
excelWriter.write(null, excelRows, "测试", 1);
}
代码中包含了工具类的简单思路，详细的封装类以及样例格式调整，待续。