这里用了POI组件，需要引入的jar包有：
curvesapi-1.03.jar
poi-3.14-20160307.jar
poi-ooxml-3.14-20160307.jar
poi-ooxml-schemas-3.14-20160307.jar
xmlbeans-2.6.0.jar
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参考： POI组件：POI操作Excel |
1、用户列表导出成Excel
1.1、listUI.jsp
UI部分
<input type="button" value="导出" class="s_button" onclick="doExportExcel()"/> <input name="userExcel" type="file"/> <input type="button" value="导入" class="s_button" onclick="doImportExcel()"/>
Javascript部分
//导出用户列表
function doExportExcel(){
window.open("${basePath}/tax/user_exportExcel.action");
}
//导入
function doImportExcel(){
document.forms[0].action = "${basePath}/tax/user_importExcel.action";
document.forms[0].submit();
}
1.2、UserAction.java
//导出用户列表
public void exportExcel()
{
try {
//1、查找用户列表
userList = userService.findAll();
//2、导出
HttpServletRequest request = ServletActionContext.getRequest();
String userAgent = request.getHeader("user-agent");
System.out.println(userAgent);
HttpServletResponse response = ServletActionContext.getResponse();
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + new String("用户列表.xls".getBytes(),"ISO-8859-1"));
ServletOutputStream outputStream = response.getOutputStream();
userService.exportExcel(userList,outputStream);
if(outputStream != null){
outputStream.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
知识点(1) new String("用户列表.xls".getBytes(),"ISO-8859-1")
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关于这一点，它的目的是解决中文乱码的问题。 我查了一些资料，也进行了测试（包括Chrome、Firefox、IE11），new String("用户列表.xls".getBytes(),"ISO-8859-1")能正常显示中文。 在做文件下载时，当文件名为中文时，经常会出现乱码现象。 大体的原因就是header中只支持ASCII，所以我们传输的文件名必须是ASCII，当文件名为中文时，必须要将该中文转换成ASCII。 这里说的ASCII码和ISO-8859-1的关系是什么 ASCII码的取值范围是0~127，可以用7个bit表示。 绝大多数计算机的一个字节是8位，取值范围是0~255，而ASCII码并没有规定编号为128~255的字符，为了能表示更多字符，各厂商制定了很多种ASCII码的扩展规范。注意，虽然通常把这些规范称为扩展ASCII码（Extended ASCII），但其实它们并不属于ASCII码标准。 在图形界面中最广泛使用的扩展ASCII码是ISO-8859-1，也称为Latin-1，其中包含欧洲各国语言中最常用的非英文字母，但毕竟只有128个字符，某些语言中的某些字母没有包含。 转换方式有很多： 方式一：将中文文件名用ISO-8859-1进行重新编码，如headers.add("Content-disposition","attachment;filename="+new String("中国".getBytes("UTF-8"),"ISO-8859-1")+".txt"); 方式二：可以对中文文件名使用url编码，如headers.add("Content-disposition","attachment;filename="+URLEncoder.encode("中国","UTF-8")+".txt"); 疑问：中文文件名转换成ASCII后传给浏览器，浏览器遇到一堆ASCII，如何能正确的还原出来我们原来的中文文件名的呢？ 有三种方法：new String(,ISO-8859-1) 、urlencoder 、fileName*=UTF-8‘‘、 ------------------------------------------------ Web applications that want to force a resource to be downloaded rather than directly rendered in a Web browser issue a Content-Disposition header in the HTTP response of the form: Content-Disposition: attachment; filename=FILENAME The filename parameter can be used to suggest a name for the file into which the resource is downloaded by the browser. RFC 2183 (Content-Disposition), however, states in section 2.3 (The Filename Parameter) that the file name can only use US-ASCII characters: Current [RFC 2045] grammar restricts parameter values (and hence Content-Disposition filenames) to US-ASCII. We recognize the great desirability of allowing arbitrary character sets in filenames, but it is beyond the scope of this document to define the necessary mechanisms. The parameters "filename" and "filename*" differ only in that "filename*" uses the encoding defined in [RFC5987], allowing the use of characters not present in the ISO-8859-1 character set ([ISO-8859-1]). |
1.3、UserSerivce.java
void exportExcel(List<User> userList, OutputStream outputStream);
1.4、UserServiceImpl.java
public void exportExcel(List<User> userList, OutputStream outputStream) {
ExcelUtils.exportUserExcel(userList, outputStream);
}
1.5、ExcelUtils.java
package com.rk.tax.utils;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
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;
import com.rk.tax.entity.User;
public class ExcelUtils {
/**
* 导出用户的所有列表到excel
* @param userList 用户列表
* @param outputStream 输出流
*/
public static void exportUserExcel(List<User> userList,OutputStream outputStream){
try {
//1、创建工作簿
HSSFWorkbook workbook = new HSSFWorkbook();
//1.1、创建合并单元格对象
CellRangeAddress cellRangeAddress = new CellRangeAddress(0, 0, 0, 4);
//1.2、头标题样式
HSSFCellStyle titleStyle = createCellStyle(workbook,(short)16);
//1.3、列标题样式
HSSFCellStyle columnHeaderStyle = createCellStyle(workbook,(short)13);
//2、创建工作表
HSSFSheet sheet = workbook.createSheet("用户列表");
//2.1、加载合并单元格对象
sheet.addMergedRegion(cellRangeAddress);
//设置默认列宽
sheet.setDefaultColumnWidth(25);
//3、创建行
//3.1、创建头标题行；并且设置头标题
HSSFRow titleRow = sheet.createRow(0);
HSSFCell titleCell = titleRow.createCell(0);
//加载单元格样式
titleCell.setCellStyle(titleStyle);
titleCell.setCellValue("用户列表");
//3.2、创建列标题行；并且设置列标题
HSSFRow columnHeaderRow = sheet.createRow(1);
String[] titles = {"用户名","账号","所属部门","性别","电子邮箱"};
for(int i=0;i<titles.length;i++){
HSSFCell columnHeaderCell = columnHeaderRow.createCell(i);
//加载单元格样式
columnHeaderCell.setCellStyle(columnHeaderStyle);
columnHeaderCell.setCellValue(titles[i]);
}
//4、操作单元格；将用户列表写入excel
if(userList != null){
for(int j=0;j<userList.size();j++){
HSSFRow row = sheet.createRow(j+2);
HSSFCell dataCell0 = row.createCell(0);
dataCell0.setCellValue(userList.get(j).getName());
HSSFCell dataCell1 = row.createCell(1);
dataCell1.setCellValue(userList.get(j).getAccount());
HSSFCell dataCell2 = row.createCell(2);
dataCell2.setCellValue(userList.get(j).getDept());
HSSFCell dataCell3 = row.createCell(3);
dataCell3.setCellValue(userList.get(j).isGender()?"男":"女");
HSSFCell dataCell4 = row.createCell(4);
dataCell4.setCellValue(userList.get(j).getEmail());
}
}
//5、输出
workbook.write(outputStream);
workbook.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 创建单元格样式
* @param workbook 工作簿
* @param fontSize 字体大小
* @return
*/
private static HSSFCellStyle createCellStyle(HSSFWorkbook workbook, short fontSize) {
HSSFCellStyle style = workbook.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
//创建字体
HSSFFont font = workbook.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//加粗字体
font.setFontHeightInPoints(fontSize);
//加载字体
style.setFont(font);
return style;
}
}
2、从Excel导入用户信息
2.1、UserAction.java
//导入用户列表
public String importExcel(){
//1、获取文件，并判断是否为excel文件
if(userExcel != null && userExcelFileName.matches("^.+\\.(?i)((xls)|(xlsx))$")){
//2、导入
userService.importExcel(userExcel,userExcelFileName);
}
return "list";
}
2.2、UserSerivce.java
void importExcel(File userExcel, String userExcelFileName);
2.3、UserSerivceImpl.java
public void importExcel(File userExcel, String userExcelFileName) {
try {
FileInputStream fileInputStream = new FileInputStream(userExcel);
boolean is03Excel = userExcelFileName.matches("^.+\\.(?i)(xls)$");
Workbook workbook = is03Excel ? new HSSFWorkbook(fileInputStream) : new XSSFWorkbook(fileInputStream);
Sheet sheet = workbook.getSheetAt(0);
if(sheet.getPhysicalNumberOfRows()>2){
User user = null;
for(int k=2;k<sheet.getPhysicalNumberOfRows();k++)
{
Row row = sheet.getRow(k);
user = new User();
//用户名
Cell cell0 = row.getCell(0);
user.setName(cell0.getStringCellValue());
//账号
Cell cell1 = row.getCell(1);
user.setAccount(cell1.getStringCellValue());
//所属部门
Cell cell2 = row.getCell(2);
user.setDept(cell2.getStringCellValue());
//性别
Cell cell3 = row.getCell(3);
user.setGender(cell3.getStringCellValue().equals("男"));
//手机号
String mobile = "";
Cell cell4 = row.getCell(4);
try {
mobile = cell4.getStringCellValue();
} catch (Exception e) {
double dMobile = cell4.getNumericCellValue();
mobile = BigDecimal.valueOf(dMobile).toString();
}
user.setMobile(mobile);
//邮箱
Cell cell5 = row.getCell(5);
user.setEmail(cell5.getStringCellValue());
//生日
Cell cell6 = row.getCell(6);
if(cell6.getDateCellValue() != null)
{
user.setBirthday(cell6.getDateCellValue());
}
//默认用户密码为123456
user.setPassword("123456");
//默认用户状态为 有效
user.setState(User.USER_STATE_VALID);
//5、保存
save(user);
}
workbook.close();
fileInputStream.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}