在SSM下使用POI实现Excel表的导入/导出

导出就是将List转化为Excel（listToExcel）

导入就是将Excel转化为List（excelToList）

POI

Apache POI是Apache软件基金会的开放源码函式库，POI提供API给Java程序对Microsoft
Office格式档案读和写的功能。

我们知道要创建一张excel你得知道excel由什么组成，比如说sheet也就是一个工作表格，例如一行，一个单元格，单元格格式，单元格内容格式…这些都对应着poi里面的一个类。

一个excel表格：

HSSFWorkbook wb = new HSSFWorkbook();

一个工作表格（sheet）：

HSSFSheet sheet = wb.createSheet("测试表格");

一行（row）：

HSSFRow row1 = sheet.createRow(0);

一个单元格（cell）：

HSSFCell cell2 = row2.createCell((short)0)

单元格格式（cellstyle）：

HSSFCellStyle style4 = wb.createCellStyle()

单元格内容格式（）

HSSFDataFormat format= wb.createDataFormat();

知道上面的基本知识后下面学起来就轻松了

poi批量导入导出的jar包

http://pan.baidu.com/s/1o7CsH78

poi-ooxml-3.13.jar

poi-ooxml-schemas-3.13.jar

poi-3.13.jar

xmlbeans-2.6.0.jar

fastjson-1.2.2-sources.jar

fastjson-1.2.2.jar

创建一个Excel表数据导入和导出的工具类ExcelUtil

http://pan.baidu.com/s/1c2vYsog

package com.city.pms.common.utils;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
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.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.streaming.SXSSFCell;
import org.apache.poi.xssf.streaming.SXSSFRow;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class ExcellUtil{

public static String NO_DEFINE = "no_define";//未定义的字段
public static String DEFAULT_DATE_PATTERN="yyyy-MM-dd";//默认日期格式
public static int DEFAULT_COLOUMN_WIDTH = 17;

private final static String excel2003L =".xls";    //2003- 版本的excel
private final static String excel2007U =".xlsx";   //2007+ 版本的excel
/**
* Excel导入
*/
public static  List<List<Object>> getBankListByExcel(InputStream in, String fileName) throws Exception{
List<List<Object>> list = null;
//创建Excel工作薄
Workbook work = getWorkbook(in,fileName);
if(null == work){
throw new Exception("创建Excel工作薄为空！");
}
Sheet sheet = null;
Row row = null;
Cell cell = null;
list = new ArrayList<List<Object>>();
//遍历Excel中所有的sheet
for (int i = 0; i < work.getNumberOfSheets(); i++) {
sheet = work.getSheetAt(i);
if(sheet==null){continue;}
//遍历当前sheet中的所有行
//包涵头部，所以要小于等于最后一列数,这里也可以在初始值加上头部行数，以便跳过头部
for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {
//读取一行
row = sheet.getRow(j);
//去掉空行和表头
if(row==null||row.getFirstCellNum()==j){continue;}
//遍历所有的列
List<Object> li = new ArrayList<Object>();
for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
cell = row.getCell(y);
li.add(getCellValue(cell));
}
list.add(li);
}
}
return list;
}
/**
* 描述：根据文件后缀，自适应上传文件的版本
*/
public static  Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{
Workbook wb = null;
String fileType = fileName.substring(fileName.lastIndexOf("."));
if(excel2003L.equals(fileType)){
wb = new HSSFWorkbook(inStr);  //2003-
}else if(excel2007U.equals(fileType)){
wb = new XSSFWorkbook(inStr);  //2007+
}else{
throw new Exception("解析的文件格式有误！");
}
return wb;
}
/**
* 描述：对表格中数值进行格式化
*/
public static  Object getCellValue(Cell cell){
Object value = null;
DecimalFormat df = new DecimalFormat("0");  //格式化字符类型的数字
SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");  //日期格式化
DecimalFormat df2 = new DecimalFormat("0.00");  //格式化数字
switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:
value = cell.getRichStringCellValue().getString();
break;
case Cell.CELL_TYPE_NUMERIC:
if("General".equals(cell.getCellStyle().getDataFormatString())){
value = df.format(cell.getNumericCellValue());
}else if("m/d/yy".equals(cell.getCellStyle().getDataFormatString())){
value = sdf.format(cell.getDateCellValue());
}else{
value = df2.format(cell.getNumericCellValue());
}
break;
case Cell.CELL_TYPE_BOOLEAN:
value = cell.getBooleanCellValue();
break;
case Cell.CELL_TYPE_BLANK:
value = "";
break;
default:
break;
}
return value;
}

/**
* 导出Excel 97(.xls)格式 ，少量数据
* @param title 标题行
* @param headMap 属性-列名
* @param jsonArray 数据集
* @param datePattern 日期格式，null则用默认日期格式
* @param colWidth 列宽 默认 至少17个字节
* @param out 输出流
*/
public static void exportExcel(Map<String, String> headMap,JSONArray jsonArray,String datePattern,int colWidth, OutputStream out) {
if(datePattern==null) datePattern = DEFAULT_DATE_PATTERN;
// 声明一个工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
workbook.createInformationProperties();
workbook.getDocumentSummaryInformation().setCompany("*****公司");

//表头样式
HSSFCellStyle titleStyle = workbook.createCellStyle();
titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
HSSFFont titleFont = workbook.createFont();
titleFont.setFontHeightInPoints((short) 20);
titleFont.setBoldweight((short) 700);
titleStyle.setFont(titleFont);

// 列头样式
HSSFCellStyle headerStyle = workbook.createCellStyle();
headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
HSSFFont headerFont = workbook.createFont();
headerFont.setFontHeightInPoints((short) 12);
headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
headerStyle.setFont(headerFont);

// 单元格样式
HSSFCellStyle cellStyle = workbook.createCellStyle();
cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
HSSFFont cellFont = workbook.createFont();
cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
cellStyle.setFont(cellFont);

// 生成一个(带标题)表格
HSSFSheet sheet = workbook.createSheet();
// 声明一个画图的顶级管理器
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
// 定义注释的大小和位置,详见文档
HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
0, 0, 0, (short) 4, 2, (short) 6, 5));
// 设置注释内容
comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
// 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
comment.setAuthor("JACK");
//设置列宽
int minBytes = colWidth<DEFAULT_COLOUMN_WIDTH?DEFAULT_COLOUMN_WIDTH:colWidth;//至少字节数
int[] arrColWidth = new int[headMap.size()];
// 产生表格标题行,以及设置列宽
String[] properties = new String[headMap.size()];
String[] headers = new String[headMap.size()];
int ii = 0;
for (Iterator<String> iter = headMap.keySet().iterator(); iter
.hasNext();) {
String fieldName = iter.next();

properties[ii] = fieldName;
headers[ii] = fieldName;

int bytes = fieldName.getBytes().length;
arrColWidth[ii] =  bytes < minBytes ? minBytes : bytes;
sheet.setColumnWidth(ii,arrColWidth[ii]*256);
ii++;
}
// 遍历集合数据，产生数据行
int rowIndex = 0;
for (Object obj : jsonArray) {
if(rowIndex == 65535 || rowIndex == 0){
if ( rowIndex != 0 ) sheet = workbook.createSheet();//如果数据超过了，则在第二页显示

HSSFRow headerRow = sheet.createRow(0); //列头 rowIndex =0
for(int i=0;i<headers.length;i++)
{
headerRow.createCell(i).setCellValue(headers[i]);
headerRow.getCell(i).setCellStyle(headerStyle);

}
rowIndex = 1;//数据内容从 rowIndex=1开始
}
JSONObject jo = (JSONObject) JSONObject.toJSON(obj);
HSSFRow dataRow = sheet.createRow(rowIndex);
for (int i = 0; i < properties.length; i++)
{
HSSFCell newCell = dataRow.createCell(i);

Object o =  jo.get(properties[i]);
String cellValue = "";
if(o==null) cellValue = "";
else if(o instanceof Date) cellValue = new SimpleDateFormat(datePattern).format(o);
else cellValue = o.toString();

newCell.setCellValue(cellValue);
newCell.setCellStyle(cellStyle);
}
rowIndex++;
}
// 自动调整宽度
/*for (int i = 0; i < headers.length; i++) {
sheet.autoSizeColumn(i);
}*/
try {
workbook.write(out);
workbook.close();
} catch (IOException e) {
e.printStackTrace();
}
}

/**
* 导出Excel 2007 OOXML (.xlsx)格式
* @param title 标题行
* @param headMap 属性-列头
* @param jsonArray 数据集
* @param datePattern 日期格式，传null值则默认 年月日
* @param colWidth 列宽 默认 至少17个字节
* @param out 输出流
*/
public static void exportExcelX(Map<String, String> headMap,JSONArray jsonArray,String datePattern,int colWidth, OutputStream out) {
if(datePattern==null) datePattern = DEFAULT_DATE_PATTERN;
// 声明一个工作薄
SXSSFWorkbook workbook = new SXSSFWorkbook(1000);//缓存
workbook.setCompressTempFiles(true);

//表头样式
CellStyle titleStyle = workbook.createCellStyle();
titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
Font titleFont = workbook.createFont();
titleFont.setFontHeightInPoints((short) 20);
titleFont.setBoldweight((short) 700);
titleStyle.setFont(titleFont);

// 列头样式
CellStyle headerStyle = workbook.createCellStyle();
headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
Font headerFont = workbook.createFont();
headerFont.setFontHeightInPoints((short) 12);
headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
headerStyle.setFont(headerFont);

// 单元格样式
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
Font cellFont = workbook.createFont();
cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
cellStyle.setFont(cellFont);

// 生成一个(带标题)表格
SXSSFSheet sheet = workbook.createSheet();
//设置列宽
int minBytes = colWidth<DEFAULT_COLOUMN_WIDTH?DEFAULT_COLOUMN_WIDTH:colWidth;//至少字节数
int[] arrColWidth = new int[headMap.size()];
// 产生表格标题行,以及设置列宽
String[] properties = new String[headMap.size()];
String[] headers = new String[headMap.size()];
int ii = 0;
for (Iterator<String> iter = headMap.keySet().iterator(); iter
.hasNext();) {
String fieldName = iter.next();

properties[ii] = fieldName;
headers[ii] = headMap.get(fieldName);

int bytes = fieldName.getBytes().length;
arrColWidth[ii] =  bytes < minBytes ? minBytes : bytes;
sheet.setColumnWidth(ii,arrColWidth[ii]*256);
ii++;
}
// 遍历集合数据，产生数据行
int rowIndex = 0;
for (Object obj : jsonArray) {
if(rowIndex == 65535 || rowIndex == 0){
if ( rowIndex != 0 ) sheet = workbook.createSheet();//如果数据超过了，则在第二页显示

SXSSFRow headerRow = sheet.createRow(0); //列头 rowIndex =0
for(int i=0;i<headers.length;i++)
{
headerRow.createCell(i).setCellValue(headers[i]);
headerRow.getCell(i).setCellStyle(headerStyle);

}
rowIndex = 1;//数据内容从 rowIndex=1开始
}
JSONObject jo = (JSONObject) JSONObject.toJSON(obj);
SXSSFRow dataRow = sheet.createRow(rowIndex);
for (int i = 0; i < properties.length; i++)
{
SXSSFCell newCell = dataRow.createCell(i);

Object o =  jo.get(properties[i]);
String cellValue = "";
if(o==null) cellValue = "";
else if(o instanceof Date) cellValue = new SimpleDateFormat(datePattern).format(o);
else if(o instanceof Float || o instanceof Double)
cellValue= new BigDecimal(o.toString()).setScale(2,BigDecimal.ROUND_HALF_UP).toString();
else cellValue = o.toString();

newCell.setCellValue(cellValue);
newCell.setCellStyle(cellStyle);
}
rowIndex++;
}
// 自动调整宽度
for (int i = 0; i < headers.length; i++) {
sheet.autoSizeColumn(i);
}
try {
workbook.write(out);
workbook.close();
workbook.dispose();
} catch (IOException e) {
e.printStackTrace();
}
}

//Web 导出excel
public static void downloadExcelFile(String title,Map<String,String> headMap,JSONArray ja,HttpServletResponse response){
try {
ByteArrayOutputStream os = new ByteArrayOutputStream();
ExcellUtil.exportExcelX(headMap,ja,null,0,os);
byte[] content = os.toByteArray();
InputStream is = new ByteArrayInputStream(content);
// 设置response参数，可以打开下载页面
response.reset();

response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename="+ new String((title + ".xlsx").getBytes(), "iso-8859-1"));
response.setContentLength(content.length);
ServletOutputStream outputStream = response.getOutputStream();
BufferedInputStream bis = new BufferedInputStream(is);
BufferedOutputStream bos = new BufferedOutputStream(outputStream);
byte[] buff = new byte[8192];
int bytesRead;
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);

}
bis.close();
bos.close();
outputStream.flush();
outputStream.close();
}catch (Exception e) {
e.printStackTrace();
}
}
}

导出的实体类

http://pan.baidu.com/s/1c2EVh2w

package com.city.pms.entity.project.design.designDTO;

import java.util.Date;
/**
*
* @Description: 导出的实体类
* @CreateTime: 2017-11-20 上午9:47:56
* @author: zhuhongfei
* @version V1.0
*/
public class ProjectDesignDTO {

private String projectName;
private String name;
private String applicantUnit;
private String reviewUnit;
private String status;
private String createName;
private Date createDate;

public String getProjectName() {
return projectName;
}
public void setProjectName(String projectName) {
this.projectName = projectName;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getApplicantUnit() {
return applicantUnit;
}
public void setApplicantUnit(String applicantUnit) {
this.applicantUnit = applicantUnit;
}
public String getReviewUnit() {
return reviewUnit;
}
public void setReviewUnit(String reviewUnit) {
this.reviewUnit = reviewUnit;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}

public String getCreateName() {
return createName;
}
public void setCreateName(String createName) {
this.createName = createName;
}
public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}

}

导入的实体类

http://pan.baidu.com/s/1i5pc6hf

package com.city.pms.entity.project.design.designA;

import java.io.Serializable;
import java.util.Date;

/**
*
* @Description: 导入实体类
* @CreateTime: 2017-11-16 上午9:23:21
* @author: chenzw
* @version V1.0
*/

public class DesignA implements Serializable {

/**
*
*/
private static final long serialVersionUID = 1749623906718021284L;

private Double id;
private Integer eid;//整数
private Integer safe;//安全值
private Double prewarning;//预警值
private Double alarm;//报警值
private Double voerflow;//溢流值
private Date createDate;//创建时间

public Double getId() {
return id;
}
public void setId(Double id) {
this.id = id;
}
public Integer getEid() {
return eid;
}
public void setEid(Integer eid) {
this.eid = eid;
}
public Integer getSafe() {
return safe;
}
public void setSafe(Integer safe) {
this.safe = safe;
}
public Double getPrewarning() {
return prewarning;
}
public void setPrewarning(Double prewarning) {
this.prewarning = prewarning;
}
public Double getAlarm() {
return alarm;
}
public void setAlarm(Double alarm) {
this.alarm = alarm;
}
public Double getVoerflow() {
return voerflow;
}
public void setVoerflow(Double voerflow) {
this.voerflow = voerflow;
}
public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}

}

整体架构（dao,service,.xml,Controller）

http://pan.baidu.com/s/1hsF2Zha

//Dao层
//获取excel数据并插入数据库
public void insertDatasFromExcel(List<DesignA> designA);
//service层
//从excel导入到designA
public String insertDatasFromExcel(InputStream in,String fileName,Map<String, String> headMap);
//获取显示列表
public List<ProjectDesign> getAllProjectDesign();
//导出接口
public List<ProjectDesignDTO> getAllProjectDesignDTO();

一、ServiceImpl-导入

package com.city.pms.service.project.design.designA;

import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.city.pms.common.utils.ImportUtil2;
import com.city.pms.entity.project.design.designA.DesignA;
import com.city.pms.repository.project.design.designA.DesignADao;
@Service
public class DesignAServiceImpl implements DesignAService {

@Autowired
private DesignADao designADao;

//
@Override
public DesignA save(String id) {
// TODO Auto-generated method stub
return designADao.save(id);
}
//导入
@Override
public String insertDatasFromExcel(InputStream in, String fileName,Map<String, String> headMap) {
try {
//首先调用工具类，读取excel文件，封装称实体集合
List<List<Object>> listob = ImportUtil2.getListByExcel(in, fileName);
//获取动态数组  动态的增加和减少元素  实现了ICollection和IList接口  灵活的设置数组的大小
List<DesignA> designA = new ArrayList<DesignA>();
//读取第一列，列头信息，第一行
List<Object> list = listob.get(0);
Iterator<String> keys = headMap.keySet().iterator();
//LinkedHashMap保留插入的顺序（key,value）
Map<String,Integer> newMap=new LinkedHashMap<String,Integer>();
while(keys.hasNext()){
String key = keys.next();
String name = headMap.get(key);
boolean flag=true;
for (int i = 0; i < list.size(); i++) {
if(StringUtils.contains(name, list.get(i).toString())){
newMap.put(key,i);
flag=false;
break;
}
}
if(flag==true){
throw new Exception("Excel表格参数错误，缺少"+name);
}
}
//遍历listob数据，把数据放到List中  从第二行开始
for (int i = 1; i < listob.size(); i++) {
List<Object> ob = listob.get(i);
DesignA design = new DesignA();
design.setEid(Integer.parseInt(ob.get(newMap.get("eid")).toString()));
design.setSafe(Integer.parseInt(ob.get(newMap.get("safe")).toString()));
//object类型转Double类型
design.setPrewarning(Double.parseDouble(ob.get(newMap.get("prewarning")).toString()));
design.setAlarm(Double.parseDouble(ob.get(newMap.get("alarm")).toString()));
design.setVoerflow(Double.parseDouble(ob.get(newMap.get("voerflow")).toString()));
Date parse = new SimpleDateFormat("yyyy-MM-dd").parse(ob.get(newMap.get("createDate")).toString());
design.setCreateDate(parse);
//Add方法用于添加一个元素到当前列表的末尾
designA.add(design);
}
//批量插入
designADao.insertDatasFromExcel(designA);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

}

ServiceImpl-导出

//导出
@Override
public List<ProjectDesignDTO> getAllProjectDesignDTO() {
//获取动态数组  动态的增加和减少元素  实现了ICollection和IList接口  灵活的设置数组的大小
List<ProjectDesignDTO> projectDesignList=new ArrayList<>();
//获取列表
List<ProjectDesign> allProjectDesign= projectDesignDao.getAllProjectDesign();
//遍历projectDesign获取真值
for (ProjectDesign projectDesign : allProjectDesign) {
//需要导出的实体类
ProjectDesignDTO projectDesignDTO=new ProjectDesignDTO();
projectDesignDTO.setProjectName(projectDesign.getProjectinfoId().getName());
projectDesignDTO.setName(projectDesign.getName());
projectDesignDTO.setApplicantUnit(projectDesign.getApplicantUnit());
projectDesignDTO.setReviewUnit(projectDesign.getReviewUnit());
projectDesignDTO.setStatus(projectDesign.getStatus());
projectDesignDTO.setCreateName(projectDesign.getCreator().getCnname());
projectDesignDTO.setCreateDate(projectDesign.getCreateDate());
//Add方法用于添加一个元素到当前列表的末尾
projectDesignList.add(projectDesignDTO);
}
return projectDesignList;
}

一、导入-xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.city.pms.repository.project.design.designA.DesignADao">
<resultMap type="DesignA" id="DesignAMap">
<id property="id" column="id"/>
<id property="eid" column="eid"/>
<id property="safe" column="safe"/>
<id property="prewarning" column="prewarning"/>
<id property="alarm" column="alarm"/>
<id property="voerflow" column="voerflow"/>
<id property="createDate" column="createDate"/>
</resultMap>

<!-- 批量插入 -->
<insert id="insertDatasFromExcel" parameterType="java.util.List">
<!-- 		<selectKey resultType ="java.lang.Integer" keyProperty= "ID" order=
"AFTER" > SELECT LAST_INSERT_ID() </selectKey > -->
insert into WARNING
(ID,EID,SAFE,PREWARNING,ALARM,OVERFLOW,CREATEDATE)
SELECT WARNING_SEQUENCE.Nextval ID, A.*
FROM(
<foreach collection="list" item="item" index="index"
separator="union all">
SELECT
#{item.eid},
#{item.safe},
#{item.prewarning},
#{item.alarm},
#{item.voerflow},
#{item.createDate}
FROM
DUAL
</foreach>
) A
</insert>
</mapper>

一、Controller

package com.city.pms.controller.project.design.designA;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.LinkedHashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.city.pms.service.project.design.designA.DesignAService;

/**
*
* @Description: TODO
* @CreateTime: 2017-11-16 上午10:39:06
* @author: zhuhongfei
* @version V1.0
*/
@Controller
@RequestMapping("/designa")
public class DesignAController {

@Autowired
private DesignAService designAService;

@RequestMapping(value= "toExcel",method = RequestMethod.GET)
public String toExcel(){
return "Excel";
}

//导入
@RequestMapping(value= "importExcel",method = RequestMethod.GET)
public String importExcel(HttpServletRequest request, Model model){

try {
File f=new File("E:\\嘉兴.xlsx");
String fileName = "嘉兴.xlsx";
Map<String, String> headMap=new LinkedHashMap<String, String>();
headMap.put("eid", "设备编号");
headMap.put("safe", "安全值");
headMap.put("prewarning", "预警值");
headMap.put("alarm", "报警值");
headMap.put("voerflow", "溢流值");
headMap.put("createDate", "创建时间");
//数据导入
InputStream in2=new FileInputStream(f);
designAService.insertDatasFromExcel(in2, fileName, headMap);
in2.close();
} catch (IOException e) {
e.printStackTrace();
}
return "Excel";
}

@RequestMapping(value = "/{id}/detail")
public String detail(@PathVariable String id, Model model) {
model.addAttribute("d",designAService.save(id));
return "";
}
}

/**
* 数据库数据导入excel(导出)
*
* @param response
*/
@RequestMapping(value = "exportExcel",method = RequestMethod.GET)
public void exportExcel(HttpServletResponse response){
//读取数据库
List<ProjectDesignDTO> allProjectDesign = projectDesignService.getAllProjectDesignDTO();
//后台返回给前台时，可以把JSON对象转化成JSON字符串
com.alibaba.fastjson.JSONArray ja= (com.alibaba.fastjson.JSONArray) com.alibaba.fastjson.JSONArray.toJSON(allProjectDesign);
//LinkedHashMap保留插入的顺序（key,value）
Map<String,String> headMap = new LinkedHashMap<String,String>();
headMap.put("projectName","项目名称");
headMap.put("name","方案名称");
headMap.put("applicantUnit","申请单位");
headMap.put("reviewUnit","评审单位");
headMap.put("status","状态");
headMap.put("createName","创建人");
headMap.put("createDate","创建时间");
String title = "工程设计方案 ";
//调用工具类导出方法
ExcellUtil.downloadExcelFile(title,headMap,ja,response);
}

一、Jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href="<%=basePath%>">
<title>嘉兴市海绵城市规划建设运营平台</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<link href="css/css2.css" rel="stylesheet" type="text/css" />
<script type="text/javascript"src="jquery/jquery-3.2.0.min.js"></script>
<style type="text/css">
body{text-align:center}
.ceshi1{margin:0 auto; width:750px;height:100px;}
</style>
</head>

<body>
<div class="warpper">
<div class="top-warpper">
<div class="logo-userInfo">
<h1 class="logo"><a href="#" >嘉兴市海绵城市规划建设运营平台</a></h1>
</div><br><br>
<div class="ceshi1">
<button class="src-derive derive" id="derive">导出</button>
  
<!-- <tr>
<button class="src-derive leadin1" id="leadin" type="file" name="userUploadFile">导入</button>
<td><input type="file" name="userUploadFile"></td>
</tr> -->
<form action="/designa/importExcel.do" method="post" enctype="multipart/form-data" name="batchAdd" onsubmit="return check();">
<div class="col-lg-4">
<input id="excel_file" type="file" name="filename" accept="xls/xlsx" size="50"/>
</div>
<input id="excel_button" class="src-derive leadin1" type="submit" value="导入Excel"/>
<%--  <font id="importMsg" color="red"><%=importMsg%></font><input type="hidden"/> --%>
</form>
</div>

<script type="text/javascript">
var root="<%=basePath%>"
</script>
<script type="text/javascript"src="js/excel1.js"></script>
<script type="text/javascript"src="js/excel2.js"></script>

</html>

一、Js

//导出
$(document).on("mousedown",".derive",function(){
var id=$(this).attr("fileId");
window.location.href=root+"/design/exportExcel.do";
});
//导入
$(document).on("mousedown",".leadin1",function(){
if(confirm("确定导入？")){
var id=$(this).attr("fileId");
window.location.href=root+"/designa/importExcel.do";
}
});