一.概念介绍
apachepoi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
二.功能相关代码
1.环境说明：jdk1.7+tomcat7+spring
2.配置文件的配置
pom文件中添加poi所需依赖
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<!-- 添加poi支持 -->
<dependency>
<groupid>org.apache.poi</groupid>
<artifactid>poi</artifactid>
<version>3.13</version>
</dependency>
<dependency>
<groupid>org.apache.poi</groupid>
<artifactid>poi-ooxml</artifactid>
<version>3.13</version>
</dependency>
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spring-mvc.xml配置文件上传
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<bean id="multipartresolver"
class="org.springframework.web.multipart.commons.commonsmultipartresolver">
<!-- 默认编码 -->
<property name="defaultencoding" value="utf-8" />
<!-- 文件大小最大值 -->
<property name="maxuploadsize" value="10485760000" />
<!-- 内存中的最大值 -->
<property name="maxinmemorysize" value="40960" />
</bean>
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3.相关工具类及代码编写
excel解析工具类（importexcelutil.java）
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package com.jointem.hrm.utils;
import org.apache.poi.hssf.usermodel.hssfworkbook;
import org.apache.poi.ss.usermodel.cell;
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.ss.util.cellrangeaddress;
import org.apache.poi.xssf.usermodel.xssfworkbook;
import java.io.ioexception;
import java.io.inputstream;
import java.text.decimalformat;
import java.text.simpledateformat;
import java.util.arraylist;
import java.util.list;
/**
* created by jenking on 2017/9/8.
*/
public class importexcelutil {
private final static string excel2003l =".xls"; //2003- 版本的excel
private final static string excel2007u =".xlsx"; //2007+ 版本的excel
/**
* 描述：获取io流中的数据，组装成list<list<object>>对象
* @param in,filename
* @return
* @throws ioexception
*/
public list<list<object>> getbanklistbyexcel(inputstream in,string filename) throws exception{
list<list<object>> list = null;
//创建excel工作薄
workbook work = this.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
system.out.println(sheet.getlastrownum());
for (int j = sheet.getfirstrownum(); j <=sheet.getlastrownum()-11; j++)
{
row = sheet.getrow(j);
// 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);
if(this.ismergedregion(sheet,j,y))
{
li.add(this.getmergedregionvalue(sheet,j,y));
}
else
{
li.add(this.getcellvalue(cell));
}
}
list.add(li);
}
}
work.close();
return list;
}
/**
* 描述：根据文件后缀，自适应上传文件的版本
* @param instr,filename
* @return
* @throws exception
*/
public 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
* @param cell
* @return
*/
public object getcellvalue(cell cell){
object value = null;
decimalformat df = new decimalformat("0"); //格式化number string字符
simpledateformat sdf = new simpledateformat("yyy-mm-dd"); //日期格式化
decimalformat df2 = new decimalformat("0"); //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;
}
/**
* 获取合并单元格的内容
* @param sheet
* @param row
* @param column
* @return
*/
public object getmergedregionvalue(sheet sheet, int row, int column)
{
int sheetmergecount = sheet.getnummergedregions();
for (int i = 0; i < sheetmergecount; i++)
{
cellrangeaddress ca = sheet.getmergedregion(i);
int firstcolumn = ca.getfirstcolumn();
int lastcolumn = ca.getlastcolumn();
int firstrow = ca.getfirstrow();
int lastrow = ca.getlastrow();
if (row >= firstrow && row <= lastrow)
{
if (column >= firstcolumn && column <= lastcolumn)
{
row frow = sheet.getrow(firstrow);
cell fcell = frow.getcell(firstcolumn);
return this.getcellvalue(fcell);
}
}
}
return null;
}
/**
* 判断是否是合并单元格
* @param sheet
* @param row
* @param column
* @return
*/
public boolean ismergedregion(sheet sheet,int row ,int column) {
int sheetmergecount = sheet.getnummergedregions();
for (int i = 0; i < sheetmergecount; i++) {
cellrangeaddress range = sheet.getmergedregion(i);
int firstcolumn = range.getfirstcolumn();
int lastcolumn = range.getlastcolumn();
int firstrow = range.getfirstrow();
int lastrow = range.getlastrow();
if(row >= firstrow && row <= lastrow){
if(column >= firstcolumn && column <= lastcolumn){
return true;
}
}
}
return false;
}
}
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请求控制器（处理页面excel导入请求）
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package com.poiexcel.control;
import java.io.inputstream;
import java.io.printwriter;
import java.util.list;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import org.springframework.stereotype.controller;
import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.requestmethod;
import org.springframework.web.bind.annotation.responsebody;
import org.springframework.web.multipart.multipartfile;
import org.springframework.web.multipart.multiparthttpservletrequest;
import com.poiexcel.util.importexcelutil;
import com.poiexcel.vo.infovo;
@controller
@requestmapping("/uploadexcel/*")
public class uploadexcelcontrol {
/**
* 描述：通过传统方式form表单提交方式导入excel文件
* @param request
* @throws exception
*/
@requestmapping(value="upload.do",method={requestmethod.get,requestmethod.post})
public string uploadexcel(httpservletrequest request) throws exception {
multiparthttpservletrequest multipartrequest = (multiparthttpservletrequest) request;
inputstream in =null;
list<list<object>> listob = null;
multipartfile file = multipartrequest.getfile("upfile");
if(file.isempty()){
throw new exception("文件不存在！");
}
in = file.getinputstream();
listob = new importexcelutil().getbanklistbyexcel(in,file.getoriginalfilename());
in.close();
//该处可调用service相应方法进行数据保存到数据库中，现只对数据输出
for (int i = 0; i < listob.size(); i++) {
list<object> lo = listob.get(i);
infovo vo = new infovo();
vo.setcode(string.valueof(lo.get(0)));
vo.setname(string.valueof(lo.get(1)));
vo.setdate(string.valueof(lo.get(2)));
vo.setmoney(string.valueof(lo.get(3)));
system.out.println("打印信息-->机构:"+vo.getcode()+" 名称："+vo.getname()+" 时间："+vo.getdate()+" 资产："+vo.getmoney());
}
return "result";
}
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前端代码
前端运用了bootstrap的文件上传组件fileinput,需要引入fileinput.css，fileinput.js，zh.js，bootstrap.css，bootstrap.js,jquery.min.js
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<body>
<h4>考勤信息录入</h4>
<form method="post" enctype="multipart/form-data" id="form1" action="${pagecontext.request.contextpath }/attendance/uploadexcel">
<input id="file-zh" name="upfile" type="file" >
</form>
</body>
<script>
$('#file-zh').fileinput({
language: 'zh',
uploadurl: '${pagecontext.request.contextpath }/attendance/uploadexcel',
allowedfileextensions : ['xls', 'xlsx']
});
</script>
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vo对象，保存excel数据对应的对象
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package com.poiexcel.vo;
//将excel每一行数值转换为对象
public class infovo {
private string code;
private string name;
private string date;
private string money;
public string getcode() {
return code;
}
public void setcode(string code) {
this.code = code;
}
public string getname() {
return name;
}
public void setname(string name) {
this.name = name;
}
public string getdate() {
return date;
}
public void setdate(string date) {
this.date = date;
}
public string getmoney() {
return money;
}
public void setmoney(string money) {
this.money = money;
}
}
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三.效果展示
1.页面展示
2.后台信息打印
四.总结
该例子只在控制台对导入的数据进行了输出，并没有进行持久化。如果要持久化，只需在注释的位置调用service层即可
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_32256235/article/details/78068865