JAVA導出特殊表頭數據-POI實現

本文解決要導出的表格表頭有合併行格和列格的場景，工具類方法兼容上一篇<<POI 生成表格通用方法>>

1. 導出表格需求以下：

2. 用於處理表頭的列

public class Column {
	//名字
	private String name;
	//起始行
	private int startRow;
	//終止行
	private int endRow;
	//起始列
	private int startCol;
	//終止列
	private int endCol;
	public Column(){	
	}
	
	public Column(String name,int startRow,int endRow,int startCol,int endCol){
		this.name = name;
		this.startRow = startRow;
		this.endRow = endRow;
		this.startCol = startCol;
		this.endCol = endCol;
	}
	
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getStartRow() {
		return startRow;
	}

	public void setStartRow(int startRow) {
		this.startRow = startRow;
	}

	public int getEndRow() {
		return endRow;
	}

	public void setEndRow(int endRow) {
		this.endRow = endRow;
	}

	public int getStartCol() {
		return startCol;
	}

	public void setStartCol(int startCol) {
		this.startCol = startCol;
	}

	public int getEndCol() {
		return endCol;
	}

	public void setEndCol(int endCol) {
		this.endCol = endCol;
	}
}

3. service 服務類

import java.util.Collection;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.cjhx.risk.backstage.common.dataexport.domain.Column;
import com.cjhx.risk.backstage.common.dataexport.service.ExcelExportService;
import com.cjhx.risk.utils.ExcelUtils;

@Service
public class ExcelExportServiceImpl implements ExcelExportService {
	@Autowired
	HttpServletResponse response;
	
	public <T> void specialExcelData(String title, Column[][] headers, String[] fields, Collection<T> dataset)
			throws Exception {
		ExcelUtils.exportSpecialExcelData(title, headers, fields, dataset,response);
	   	response.setCharacterEncoding("UTF-8");
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet; charset=UTF-8");
	}
}

4. 導出工具類

import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import com.cjhx.risk.backstage.common.dataexport.domain.Column;
public class ExcelUtils {
	private static String getName = "get";
	private static String dataFormat = "yyyy-MM-dd";

	public static <T> void exportSpecialExcelData(String title,Column[][] headers,String[] fields,Collection<T> dataset,HttpServletResponse response)
			throws Exception {
		XSSFWorkbook workBook = null;
		try{
			workBook = new XSSFWorkbook();
			XSSFSheet sheet = workBook.createSheet(title);
			sheet.setDefaultColumnWidth((short) 15);
			
			//表頭的行數和列數
			int rowSize = headers.length;
			int colSize = fields.length;
			
			//表頭單元格樣式
			XSSFCellStyle headCellStyle = workBook.createCellStyle();
			Font fontStyle = workBook.createFont();
			fontStyle.setBold(true);
			fontStyle.setFontName("黑體");
			fontStyle.setFontHeightInPoints((short) 11);
			headCellStyle.setFont(fontStyle);
			
			//設置邊框和垂直水平居中
			headCellStyle.setBorderBottom(BorderStyle.THIN);  
			headCellStyle.setBorderLeft(BorderStyle.THIN);  
			headCellStyle.setBorderRight(BorderStyle.THIN);  
			headCellStyle.setBorderTop(BorderStyle.THIN); 
			headCellStyle.setAlignment(HorizontalAlignment.CENTER); 
			headCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
			
			//構建表頭
			XSSFRow headRow;
			for (int i = 0; i < rowSize; i++){
				headRow = sheet.createRow(i);
				
				XSSFCell headCell;
				for (int j = 0; j < colSize; j++){
					headCell = headRow.createCell(j);
					XSSFRichTextString text = new XSSFRichTextString(headers[i][j].getName());
					headCell.setCellValue(text);
					
					//設置表頭單元格樣式
					headCell.setCellStyle(headCellStyle);
				}
			}
			
			//合併表頭
			int startRow,endRow,startCol,endCol;
			CellRangeAddress cra;
			for (int i = 0; i < rowSize; i++){
				for (int j = 0; j < colSize; j++){
					startRow = headers[i][j].getStartRow();
					endRow = headers[i][j].getEndRow();
					startCol = headers[i][j].getStartCol();
					endCol = headers[i][j].getEndCol();
					
					//若是待合併的行數和列數同時爲0,則無需合併
					if (startRow == endRow && startCol == endCol){
						continue;
					}
					cra = new CellRangeAddress(startRow, endRow, startCol, endCol);
					sheet.addMergedRegion(cra); 
				}
			}
			
			//表格內容單元格樣式
			XSSFCellStyle bodyCellStyle = workBook.createCellStyle();
			//設置垂直和水平居中
			bodyCellStyle.setAlignment(HorizontalAlignment.CENTER); 
			bodyCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
			
			// 構建表體數據
			Iterator<T> it = dataset.iterator();
			int index = rowSize - 1;
			while (it.hasNext()) {
				index++;
				XSSFRow bodyRow = sheet.createRow(index);
				T t = (T) it.next();

				XSSFCell bodyCell;
				for (int i = 0; i < fields.length; i++) {
					bodyCell = bodyRow.createCell(i);

					String fieldName = fields[i];
					String getMethodName = getName + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);

					Class<? extends Object> tCls = t.getClass();
					Method getMethod = tCls.getMethod(getMethodName, new Class[] {});
					Object value = getMethod.invoke(t, new Object[] {});

					String textValue = null;
					if (value instanceof Date) {
						Date date = (Date) value;
						SimpleDateFormat sdf = new SimpleDateFormat(dataFormat);
						textValue = sdf.format(date);
					} else if (value != null) {
						// 其它數據類型都看成字符串簡單處理
						textValue = value.toString();
					} else {
						textValue = " ";
					}

					bodyCell.setCellValue(textValue);
					bodyCell.setCellStyle(bodyCellStyle);
				}
			}
			workBook.write(response.getOutputStream());
		} catch(Exception e){
			throw e;
		} finally {
			if (workBook != null) {
				workBook.close();
			}
		}
	}
	
	public static <T> void exportExcelData(String title, String[] headers, String[] colums, Collection<T> dataset,HttpServletResponse response)
			throws Exception {

		Column col;
		int colSize = colums.length;
		Column[][] newHeaders = new Column[1][colSize];
		for (int i = 0; i < colSize; i++){
			col = new Column();
			col.setName(headers[i]);
			col.setStartRow(0);
			col.setEndRow(0);
			col.setStartCol(i);
			col.setEndCol(i);
			newHeaders[0][i] = col;
		}
		
		exportSpecialExcelData(title,newHeaders,colums,dataset,response);
	}
}

5. 服務調用

List<HedgeFundReport> list =  ......- ;
		if (null == list){
			list = new ArrayList<>();
		}
		
		//導出的表頭
		Column[][] headers = new Column[2][22];
		headers[0][0] = new Column("A00",0,1,0,0);
		headers[0][1] = new Column("A01",0,1,1,1);
		headers[0][2] = new Column("A02",0,1,2,2);
		headers[0][3] = new Column("A03",0,1,3,3);
		headers[0][4] = new Column("A04",0,1,4,4);
		headers[0][5] = new Column("A05",0,1,5,5);
		headers[0][6] = new Column("A06",0,1,6,6);
		headers[0][7] = new Column("A07",0,1,7,7);
		headers[0][8] = new Column("A08",0,1,8,8);
		headers[0][9] = new Column("A09",0,1,9,9);
		headers[0][10] = new Column("A010",0,0,10,14);
		headers[0][11] = new Column("A010",0,0,11,11);
		headers[0][12] = new Column("A010",0,0,12,12);
		headers[0][13] = new Column("A010",0,0,13,13);
		headers[0][14] = new Column("A010",0,0,14,14);
		headers[0][15] = new Column("A015",0,0,15,21);
		headers[0][16] = new Column("A015",0,0,16,16);
		headers[0][17] = new Column("A015",0,0,17,17);
		headers[0][18] = new Column("A015",0,0,18,18);
		headers[0][19] = new Column("A015",0,0,19,19);
		headers[0][20] = new Column("A015",0,0,20,20);
		headers[0][21] = new Column("A015",0,0,21,21);
		
		headers[1][0] = new Column("B10",1,1,0,0);
		headers[1][1] = new Column("B11",1,1,1,1);
		headers[1][2] = new Column("B12",1,1,2,2);
		headers[1][3] = new Column("B13",1,1,3,3);
		headers[1][4] = new Column("B14",1,1,4,4);
		headers[1][5] = new Column("B15",1,1,5,5);
		headers[1][6] = new Column("B16",1,1,6,6);
		headers[1][7] = new Column("B17",1,1,7,7);
		headers[1][8] = new Column("B18",1,1,8,8);
		headers[1][9] = new Column("B19",1,1,9,9);
		headers[1][10] = new Column("B110",1,1,10,10);
		headers[1][11] = new Column("B111",1,1,11,11);
		headers[1][12] = new Column("B112",1,1,12,12);
		headers[1][13] = new Column("B113",1,1,13,13);
		headers[1][14] = new Column("B114",1,1,14,14);
		headers[1][15] = new Column("B115",1,1,15,15);
		headers[1][16] = new Column("B116",1,1,16,16);
		headers[1][17] = new Column("B117",1,1,17,17);
		headers[1][18] = new Column("B118",1,1,18,18);
		headers[1][19] = new Column("B119",1,1,19,19);
		headers[1][20] = new Column("B120",1,1,20,20);
		headers[1][21] = new Column("B121",1,1,21,21);
		
		// 導出的字段	
		String[] colums = { "fundCode", "fundName", "hedgeEndDate", "hedgePeriod",
				            "fundNetVal","presentVal","safetyMat","remainPeriod",
				            "fixRate","breakEvenBalance","equityAssetA","equityAssetB",
				            "equityAssetC","equityAssetD","equityAssetT","curMVal1",
				            "curMVal2","curMVal3","curMVal4","curMVal5",
				            "curMVal6","curMVal7"};
		excelExportService.specialExcelData("hedgeFundsList", headers, colums, list);

6. 導出表格樣式

7. 頁面

//報表數據導出
        $scope.exportData = function(){
            var loading=dialog.loading("導出中，請等待。。。");
            var param = {};
            param.fundId = $scope.guaranteed.lFundId;
            return $http({
                url:"abnormal/monitorHedgeFund/exportdata",
                method: "POST",
                responseType: 'arraybuffer',
                headers: { 'Content-Type': 'application/json' },
                data: param
            }).success(function (data) {
                loading.close();
                var time = new Date();
                var ymd = $filter("date")(time,"yyyyMMdd");
                var filename ='hedgeFunds'+ymd+time.getHours()+time.getMinutes()+time.getSeconds()+'.xlsx';
                var blob = new Blob([data], {type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"});
                if (window.navigator.msSaveOrOpenBlob) {// For IE:
                    navigator.msSaveBlob(blob, filename);
                }else{ // For other browsers:
                    var objectUrl = URL.createObjectURL(blob);
                    var a = document.createElement('a');
                    document.body.appendChild(a);
                    a.setAttribute('style', 'display:none');
                    a.setAttribute('href', objectUrl);
                    a.setAttribute('download', filename);
                    a.click();
                    URL.revokeObjectURL(objectUrl);
                }
            });
        }