导出Excel（可以合并相同数据单元格）
pom.xml中
org.apache.poi
poi
3.7
org.apache.poi
poi-scratchpad
3.14
util工具类
package com.mdsw.dses.statistics.util;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.collections.CollectionUtils;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.util.CellRangeAddress;
public class ExcelUtilIndex {
private ExcelUtilIndex() {
throw new IllegalStateException("Utility class");
}
/**
* @param fileName 文件名称
* @param headers 表头
* @param dataset 数据集
* @param response HttpServletResponse
* @param mergeBasis 合并基准列 可选
* @param mergeCells 要合并的列 可选
* @throws IOException
*/
public static void exportExelMerge(String fileName,final String[] headers,List dataset,HttpServletResponse response, final Integer[] mergeBasis, final Integer[] mergeCells) throws IOException{
String title = "Sheet1";
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));
createExcelMerge(title,headers,dataset,response.getOutputStream(),mergeBasis,mergeCells);
response.setStatus(HttpServletResponse.SC_OK);
response.flushBuffer();
}
/**
* @param fileName 文件名称
* @param title 表头
* @param dataset 数据集
* @param out OutputStream
* @param mergeBasis 合并基准列 可选
* @param mergeCells 要合并的列
*/
public static void createExcelMerge(String fileName,String[] title,List dataset, OutputStream out, final Integer[] mergeBasis, final Integer[] mergeCells){
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet(fileName);
if(title == null || title.length <= 0){
return;
}
HSSFRow row = sheet.createRow(0); // 产生表格标题行
for (int i = 0; i < title.length; i++) {
HSSFCell cell = row.createCell(i);
HSSFRichTextString text = new HSSFRichTextString(title[i]);
cell.setCellValue(text);
}
// 遍历集合数据，产生数据行
Iterator it = dataset.iterator();
int index = 0;
while (it.hasNext()) {
index++;
row = sheet.createRow(index);
String[] dataSources = it.next() ;
for (int i = 0; i < dataSources.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellValue(dataSources[i]);
}
}
try {
if(mergeBasis != null && mergeBasis.length > 0 && mergeCells != null && mergeCells.length > 0){
for(int i = 0 ; i < mergeCells.length ; i++){
mergedRegion(sheet,mergeCells[i],1,sheet.getLastRowNum(),workbook,mergeBasis);
}
}
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 合并单元格
* @param sheet
* @param cellLine
* @param startRow
* @param endRow
* @param workbook
* @param mergeBasis
*/
private static void mergedRegion(HSSFSheet sheet, int cellLine,int startRow, int endRow, HSSFWorkbook workbook, Integer[] mergeBasis) {
String s_will = sheet.getRow(startRow).getCell(cellLine).getStringCellValue(); // 获取第一行的数据,以便后面进行比较
int count = 0;
Set set = new HashSet();
CollectionUtils.addAll(set, mergeBasis);
for (int i = 2; i <= endRow; i++) {
String s_current = sheet.getRow(i).getCell(cellLine).getStringCellValue();
if (s_will.equals(s_current)) {
boolean isMerge = true;
if(!set.contains(cellLine)){//如果不是作为基准列的列 需要所有基准列都相同
for(int j = 0 ; j < mergeBasis.length ; j++){
if(!sheet.getRow(i).getCell(mergeBasis[j]).getStringCellValue()
.equals(sheet.getRow(i-1).getCell(mergeBasis[j]).getStringCellValue())){
isMerge = false;
}
}
}else{//如果作为基准列的列 只需要比较列号比本列号小的列相同
for(int j = 0 ; j < mergeBasis.length && mergeBasis[j] < cellLine ; j++){
if(!sheet.getRow(i).getCell(mergeBasis[j]).getStringCellValue()
.equals(sheet.getRow(i-1).getCell(mergeBasis[j]).getStringCellValue())){
isMerge = false;
}
}
}
if(isMerge){
count++;
}else{
sheet.addMergedRegion(new CellRangeAddress( startRow, startRow+count,cellLine , cellLine));
startRow = i;
s_will = s_current;
count = 0;
}
} else {
sheet.addMergedRegion(new CellRangeAddress( startRow, startRow+count,cellLine , cellLine));
startRow = i;
s_will = s_current;
count = 0;
}
if (i == endRow && count > 0) {
sheet.addMergedRegion(new CellRangeAddress(startRow,startRow+count ,cellLine , cellLine));
}
}
}
}
实体类
//不需要合并的类
public class AntibacterialDrugUse {
/**属性1*/
private String 属性1;
/**属性2*/
private String 属性2;
/**属性3*/
private String 属性3;
/**属性4*/
private String 属性4;
/**属性5*/
private String 属性5;
/**需要合并的类*/
private List<需要合并的类> adrugs;
}
Server层
public void exportExcel(String 条件, HttpServletResponse rep);
Server实现类
@Override
public void exportExcel(String 条件1, HttpServletResponse rep) {
String[] title = { "列1","列2","列3","列4","列5","列6","列7","列8","列9","列10" };
List<实体类> adu = aduMapper.selectData(条件1);
List dataset = new ArrayList();
for (不需要合并的实体类 adus : adu) {
for (需要合并的列实体类 aaa : adus.getAdrugs()) {
dataset.add(new String[] {
//不需要合并的列
adus.getClinicno(),adus.getVisitTime(),adus.getPatientName(),adus.getAge(),adus.getVisitDoctor(),
//需要合并的列
aaa.getAntiName(),aaa.getDrugDose(),aaa.getDrugSpec(),aaa.getDrugCost().toString()});
}
}
try {
ExcelUtilIndex.exportExelMerge("表.xls", title, dataset,rep, new Integer[]{0}, new Integer[]{0,1,2,3,4,5});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}