Go directly to the code. The principle has been explained in the previous essay.
1. Take a look at the effect first
2.html code, including js code
cpm system
<div> <a href="/home/export">导出</a> </div>
地区公司部门员工姓名
3.Backend code
3.1 Paging parameter object
package com.xincheng.cpm.common;/**
* Created by hdwang on 2017/6/22.
* 分页参数 */public class PageParam {/** * 第几次绘画（前端标识） */private int draw;/** * 起始记录(从0开始)，mysql也是从0开始，吻合，good！ */private int start;/** * 页大小 */private int length;public int getDraw() {return draw;
}public void setDraw(int draw) {this.draw = draw;
}public int getStart() {return start;
}public void setStart(int start) {this.start = start;
}public int getLength() {return length;
}public void setLength(int length) {this.length = length;
}/** * 第几页(0-n) */public int getPage(){return this.start/this.length;
}
}
3.2 Data return object
package com.xincheng.cpm.common;import java.util.List;/**
* Created by hdwang on 2017/6/22.
* 表格数据（datatables） */public class TableData<T> {/** * 第几次绘画（前端标识） */private int draw;/** * 行过滤（不知道干嘛的） */private int recordsFiltered;/** * 总行数 */private int recordsTotal;/** * 行数据 */private List<T> data;/** * 起始记录(用于前端初始化序列号用的) */private int start;/** * 错误信息 */private String error;public int getDraw() {return draw;
}public void setDraw(int draw) {this.draw = draw;
}public int getRecordsFiltered() {return recordsFiltered;
}public void setRecordsFiltered(int recordsFiltered) {this.recordsFiltered = recordsFiltered;
}public int getRecordsTotal() {return recordsTotal;
}public void setRecordsTotal(int recordsTotal) {this.recordsTotal = recordsTotal;
}public List<T> getData() {return data;
}public void setData(List<T> data) {this.data = data;
}public int getStart() {return start;
}public void setStart(int start) {this.start = start;
}public String getError() {return error;
}public void setError(String error) {this.error = error;
}
}
3.3 Data entity object
package com.xincheng.cpm.common;import java.io.Serializable;/**
* Created by hdwang on 2017/7/14. */public class Member{private String area;private String company;private String department;private String userName;private Integer areaRowSpan;private Integer companyRowSpan;private Integer departmentRowSpan;public Member(String area,String company,String department,String userName){this.area = area;this.company = company;this.department = department;this.userName = userName;
}public String getArea() {return area;
}public void setArea(String area) {this.area = area;
}public String getCompany() {return company;
}public void setCompany(String company) {this.company = company;
}public String getDepartment() {return department;
}public void setDepartment(String department) {this.department = department;
}public String getUserName() {return userName;
}public void setUserName(String userName) {this.userName = userName;
}public Integer getAreaRowSpan() {return areaRowSpan;
}public void setAreaRowSpan(Integer areaRowSpan) {this.areaRowSpan = areaRowSpan;
}public Integer getCompanyRowSpan() {return companyRowSpan;
}public void setCompanyRowSpan(Integer companyRowSpan) {this.companyRowSpan = companyRowSpan;
}public Integer getDepartmentRowSpan() {return departmentRowSpan;
}public void setDepartmentRowSpan(Integer departmentRowSpan) {this.departmentRowSpan = departmentRowSpan;
}
}
3.4 Export Related classes
package com.xincheng.cpm.common;/**
* Created by hdwang on 2017/7/14. */public class ExcelData {private String value;//单元格的值private int colSpan = 1;//单元格跨几列private int rowSpan = 1;//单元格跨几行private boolean alignCenter;//单元格是否居中，默认不居中，如果选择是，则水平和上下都居中public boolean isAlignCenter() {return alignCenter;
}public void setAlignCenter(boolean alignCenter) {this.alignCenter = alignCenter;
}public String getValue() {return value;
}public void setValue(String value) {this.value = value;
}public int getColSpan() {return colSpan;
}public void setColSpan(int colSpan) {this.colSpan = colSpan;
}public int getRowSpan() {return rowSpan;
}public void setRowSpan(int rowSpan) {this.rowSpan = rowSpan;
}
}package com.xincheng.cpm.common;import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.CellStyle;import org.apache.poi.ss.util.CellRangeAddress;import org.apache.poi.xssf.usermodel.XSSFFont;import org.apache.poi.xssf.usermodel.XSSFRow;import org.apache.poi.xssf.usermodel.XSSFSheet;import org.apache.poi.xssf.usermodel.XSSFWorkbook;import java.util.List;/**
* Created by hdwang on 2017/7/14. */public class ExcelUtil {/** * 生成excel工作簿
* @param sheetTitle sheet名称
* @param titles 标题
* @param rows 行数据
* @return 工作簿 */public XSSFWorkbook execute(String sheetTitle,String[] titles,List<List<ExcelData>> rows) {//定义工作簿XSSFWorkbook workbook = new XSSFWorkbook();//th样式CellStyle titleStyle = workbook.createCellStyle();
titleStyle.setBorderBottom((short) 1);
titleStyle.setBorderRight((short)1);
titleStyle.setBorderLeft((short)1);
titleStyle.setBorderTop((short)1);
titleStyle.setVerticalAlignment((short)1);
titleStyle.setAlignment((short)2);
XSSFFont font = workbook.createFont();
font.setBold(true);
titleStyle.setFont(font);//td样式CellStyle style = workbook.createCellStyle();
style.setBorderBottom((short)1);
style.setBorderRight((short)1);
style.setBorderLeft((short)1);
style.setBorderTop((short)1);
style.setVerticalAlignment((short)1);//创建工作表XSSFSheet sheet = workbook.createSheet(sheetTitle);
sheet.setDefaultRowHeightInPoints(20.0F);//创建标题行XSSFRow titleRow = sheet.createRow(0);for(int col=0;col<titles.length;col++) { //遍历列Cell cell = titleRow.createCell(col);
cell.setCellStyle(titleStyle);
cell.setCellValue(titles[col]);for(int row=0;row<rows.size();row++){ //遍历行int rowIndex = row+1;
XSSFRow contentRow = sheet.getRow(rowIndex);if(contentRow == null){
contentRow = sheet.createRow(rowIndex);
}
ExcelData data = rows.get(row).get(col);
Cell contentRowCell = contentRow.createCell(col);
contentRowCell.setCellStyle(style);
contentRowCell.setCellValue(data.getValue());//合并单元格if (data.getColSpan() > 1 || data.getRowSpan() > 1) {
CellRangeAddress cra = new CellRangeAddress(rowIndex, rowIndex + data.getRowSpan() - 1, col, col + data.getColSpan() - 1);
sheet.addMergedRegion(cra);
}
}
}return workbook;
}
}
3.5 controller layer
package com.xincheng.cpm.controller;import com.chenrd.common.excel.ExportExcel;import com.xincheng.cpm.common.*;import com.xincheng.cpm.entity.cpm.User;import com.xincheng.cpm.service.UserService;import com.xincheng.cpm.vo.IncomeDailyVO;import org.apache.commons.lang3.StringUtils;import org.apache.poi.xssf.usermodel.XSSFWorkbook;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.domain.Page;import org.springframework.data.domain.PageImpl;import org.springframework.data.domain.PageRequest;import org.springframework.data.domain.Pageable;import org.springframework.stereotype.Controller;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.io.IOException;import java.io.OutputStream;import java.net.URLEncoder;import java.util.*;/**
* Created by hdwang on 2017/6/19. */@Controller
@RequestMapping("/home")public class HomeController {
@Autowired
UserService userService;
@RequestMapping("")public String index(HttpSession session, ModelMap map, HttpServletRequest request){
User user = (User) session.getAttribute("user");
map.put("user",user);return "home";
}
@RequestMapping(value="/query",method= RequestMethod.POST)
@ResponseBodypublic TableData<Member> getUserByPage(PageParam pageParam, User user){
Page<Member> userPage = this.getMembers(pageParam);
TableData<Member> datas = new TableData<>();
datas.setDraw(pageParam.getDraw());
datas.setStart(pageParam.getStart());
datas.setData(userPage.getContent());
datas.setRecordsFiltered((int)userPage.getTotalElements());
datas.setRecordsTotal((int)userPage.getTotalElements());return datas;
}private Page<Member> getMembers(PageParam pageParam) {//1.模拟数据库查询Pageable pageable = new PageRequest(pageParam.getPage(), pageParam.getLength());long count = 6;
List<Member> members = getMembersFromDb();//2.计算rowspanthis.countRowspan(members);
Page<Member> memberPage = new PageImpl<Member>(members,pageable,count);return memberPage;
}private void countRowspan(List<Member> members) {
Map<String,Integer> propertyCountMap = this.countPropertyCount(members);
List<String> hadGetKeys = new ArrayList<>(); //曾经取过的keyfor(Member member:members){
String areaKey = member.getArea();
String companyKey = areaKey+member.getCompany();
String departmentKey = companyKey+ member.getDepartment();
Integer areaCount = propertyCountMap.get(areaKey);if(areaCount == null){
member.setAreaRowSpan(1);
}else{if(hadGetKeys.contains(areaKey)){
member.setAreaRowSpan(0); //曾经取过}else{
member.setAreaRowSpan(areaCount); //第一次取 hadGetKeys.add(areaKey);
}
}
Integer companyCount = propertyCountMap.get(companyKey);if(companyCount == null){
member.setCompanyRowSpan(1);
}else {if(hadGetKeys.contains(companyKey)){
member.setCompanyRowSpan(0);
}else{
member.setCompanyRowSpan(companyCount);
hadGetKeys.add(companyKey);
}
}
Integer departmentCount = propertyCountMap.get(departmentKey);if(companyCount == null){
member.setDepartmentRowSpan(1);
}else {if(hadGetKeys.contains(departmentKey)){
member.setDepartmentRowSpan(0);
}else{
member.setDepartmentRowSpan(departmentCount);
hadGetKeys.add(departmentKey);
}
}
}
}private List<Member> getMembersFromDb() {
Member member1 = new Member("安徽","A","人力资源部"," 小红");
Member member2 = new Member("安徽","B","人力资源部"," 小明");
Member member3 = new Member("浙江","C","人力资源部"," 小君");
Member member4 = new Member("浙江","C","技术部"," 小王");
Member member5 = new Member("浙江","D","技术部"," 小李");
Member member6 = new Member("浙江","D","人力资源部"," 小刚");
List<Member> members = new ArrayList<>();
members.add(member1);
members.add(member2);
members.add(member3);
members.add(member4);
members.add(member5);
members.add(member6);return members;
}/** * 统计每个字段的每组成员个数
* @param rows 记录
* @return 每个字段的每组成员个数 */private Map<String,Integer> countPropertyCount(List<Member> rows){
Map<String,Integer> propertyCountMap = new HashMap<>();for(Member member:rows){// "area": 无父级分组String area = member.getArea();if(propertyCountMap.get(area) == null){
propertyCountMap.put(area,1);
}else{int count = propertyCountMap.get(area);
propertyCountMap.put(area,count+1);
}// "company":有area父组String company = member.getCompany();
String uniqueParent = member.getArea();
String key = uniqueParent + company;if(propertyCountMap.get(key) == null){
propertyCountMap.put(key,1);
}else{int count = propertyCountMap.get(key);
propertyCountMap.put(key,count+1);
}// "department": 有area,company这两个父组String department = member.getDepartment();
uniqueParent = member.getArea()+member.getCompany();
key = uniqueParent + department;if(propertyCountMap.get(key) == null){
propertyCountMap.put(key,1);
}else{int count = propertyCountMap.get(key);
propertyCountMap.put(key,count+1);
}
}return propertyCountMap;
}
@RequestMapping("/export")public void export(HttpServletResponse response) throws IOException {
List<Member> members = this.getMembersFromDb();this.countRowspan(members);
List<List<ExcelData>> rows = new ArrayList<>();for(Member member:members){
List<ExcelData> row = new ArrayList<>();
ExcelData col1 = new ExcelData();
col1.setValue(member.getArea());
col1.setRowSpan(member.getAreaRowSpan());
row.add(col1);
ExcelData col2 = new ExcelData();
col2.setValue(member.getCompany());
col2.setRowSpan(member.getCompanyRowSpan());
row.add(col2);
ExcelData col3 = new ExcelData();
col3.setValue(member.getDepartment());
col3.setRowSpan(member.getDepartmentRowSpan());
row.add(col3);
ExcelData col4 = new ExcelData();
col4.setValue(member.getUserName());
row.add(col4);
rows.add(row);
}
OutputStream outputStream = response.getOutputStream();try {
String filename = URLEncoder.encode("员工" + ".xlsx", "UTF-8");
response.setContentType("application/vnd.ms-excel");
response.addHeader("Content-Disposition", "octet-stream;filename=" + filename);
ExcelUtil excelUtil = new ExcelUtil();
XSSFWorkbook workbook = excelUtil.execute("sheet1",new String[]{"地区","公司","部门","员工姓名"},rows);
workbook.write(outputStream);
} finally {if (outputStream != null) outputStream.close();
}
}
}The export excel function is implemented using the poi class library. At this point, page display and export are OK!
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