本文实例为大家分享了java使用poi导出图片到excel的具体代码，供大家参考，具体内容如下
代码实现
controller
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/**
* 导出志愿者/人才数据
* @param talent_type
* @return
*/
@requestmapping("/exportdata")
public void exportdata(integer talent_type, httpservletresponse response) {
string fileid = uuid.randomuuid().tostring().replace("-", "");
map<string, object> param = new hashmap<>() ;
param.put("talent_type", talent_type) ;
try {
list<map<string, object>> volunteermaplist = volunteerservice.getexportdata(param) ;
string rootpath = sysconfigmanager.getinstance().gettext("/config/sys/rootpath");
string filepath = rootpath + "/" + fileid + ".xlsx" ;
volunteerservice.exportdata(volunteermaplist, filepath) ;
// 下载
fileinputstream inputstream = null;
try{
//设置发送到客户端的响应内容类型
response.reset();
response.setcontentlength((int) new file(filepath).length());
response.setcontenttype("application/octet-stream");
response.addheader("content-disposition", "attachment; filename=\"" + urlencoder.encode("文件名.xlsx", "utf-8")+ "\"");
//读取本地图片输入流
inputstream = new fileinputstream(filepath);
// 循环取出流中的数据
byte[] b = new byte[1024];
int len;
while ((len = inputstream.read(b)) > 0)
response.getoutputstream().write(b, 0, len);
} finally{
if(inputstream != null){
inputstream.close();
}
}
logger.debug("导出志愿者/人才数据成功！");
} catch (exception e) {
e.printstacktrace();
logger.error("导出志愿者/人才数据异常！");
}
}
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service
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public void exportdata(list<map<string, object>> volunteermaplist, string filepath) throws exception {
string[] alias = {"头像", "名称", "个人/团体", "志愿者/人才", "性别", "生日", "手机号",
"身份证", "省份", "市", "区/县", "详细地址", "邮箱", "政治面貌", "学历", "民族",
"职业", "团队人数", "艺术特长", "介绍"};
string[] keys = {"photo", "name", "type", "talent_type", "sex", "birth_day", "mobile",
"idcard", "province", "city", "county", "address", "email", "political",
"education", "nation", "profession", "member_count", "art_spetiality", "content"};
file file = new file(filepath);
if (!file.exists()) file.createnewfile();
fileoutputstream fileoutput = new fileoutputstream(file);
xssfworkbook workbook = new xssfworkbook();
int sheetsize = volunteermaplist.size() + 50;
double sheetno = math.ceil(volunteermaplist.size() / sheetsize);
string photoimgpath = sysconfigmanager.getinstance().gettext("/config/sys/rootpath") ;
for (int index = 0; index <= sheetno; index++) {
xssfsheet sheet = workbook.createsheet();
workbook.setsheetname(index, "人才、志愿者" + index);
xssfrow row = sheet.createrow(0);
sheet.setcolumnwidth(0, 2048);
xssfcell cell;
xssfcellstyle cellstyle = workbook.createcellstyle();
xssffont font = workbook.createfont();
font.setboldweight(xssffont.boldweight_bold);
// 居中
cellstyle.setalignment(xssfcellstyle.align_center);
// 加粗
cellstyle.setfont(font);
//创建标题
for (int i = 0; i < alias.length; i++) {
cell = row.createcell(i);
cell.setcellvalue(alias[i]);
cell.setcellstyle(cellstyle);
}
int startno = index * sheetsize;
int endno = math.min(startno + sheetsize, volunteermaplist.size());
cellstyle = workbook.createcellstyle();
// 居中
cellstyle.setalignment(xssfcellstyle.align_center);
cellstyle.setverticalalignment(xssfcellstyle.vertical_center);
// 写入各条记录,每条记录对应excel表中的一行
for (int i = startno; i < endno; i++) {
int rownum = i + 1 - startno ;
row = sheet.createrow(rownum);
map<string, object> map = (map<string, object>) volunteermaplist.get(i);
for (int j = 0; j < keys.length; j++) {
cell = row.createcell(j);
string key = keys[j] ;
if (key.equals("photo")){
sheet.addmergedregion(new cellrangeaddress(i + 1,i + 1,i + 1,i + 1)) ;
// 头像
file photofile = new file(photoimgpath + map.get(key)) ;
if (photofile.exists()){
bufferedimage bufferedimage = imageio.read(photofile) ;
bytearrayoutputstream bytearrayout = new bytearrayoutputstream();
imageio.write(bufferedimage, "jpg", bytearrayout);
byte[] data = bytearrayout.tobytearray();
xssfdrawing drawingpatriarch = sheet.createdrawingpatriarch();
xssfclientanchor anchor = new xssfclientanchor(480, 30, 700, 250, (short)0, i + 1, (short) 1, i + 2);
drawingpatriarch.createpicture(anchor, workbook.addpicture(data, xssfworkbook.picture_type_jpeg));
sheet.setcolumnwidth((short)500, (short)500);
row.setheight((short)500);
} else {
cell.setcelltype(xssfcell.cell_type_string);
cell.setcellvalue("");
}
} else {
cell.setcelltype(xssfcell.cell_type_string);
object value = map.get(key);
cell.setcellvalue(value == null ? "" : value.tostring());
cell.setcellstyle(cellstyle);
}
}
}
// 设置列宽
for (int i = 1; i < alias.length; i++)
sheet.autosizecolumn(i);
// 处理中文不能自动调整列宽的问题
this.setsizecolumn(sheet, alias.length);
}
fileoutput.flush();
workbook.write(fileoutput);
fileoutput.close();
}
// 自适应宽度(中文支持)
private void setsizecolumn(xssfsheet sheet, int size) {
for (int columnnum = 0; columnnum < size; columnnum++) {
int columnwidth = sheet.getcolumnwidth(columnnum) / 256;
for (int rownum = 0; rownum <= sheet.getlastrownum(); rownum++) {
xssfrow currentrow;
//当前行未被使用过
if (sheet.getrow(rownum) == null) {
currentrow = sheet.createrow(rownum);
} else {
currentrow = sheet.getrow(rownum);
}
if (currentrow.getcell(columnnum) != null) {
xssfcell currentcell = currentrow.getcell(columnnum);
if (currentcell.getcelltype() == xssfcell.cell_type_string) {
int length = currentcell.getstringcellvalue().getbytes().length;
if (columnwidth < length) columnwidth = length;
}
}
}
columnwidth = columnwidth * 256 ;
sheet.setcolumnwidth(columnnum, columnwidth >= 65280 ? 6000 : columnwidth);
}
}
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以上所述是小编给大家介绍java poi导出图片到excel示例代码解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：https://blog.csdn.net/wkh___/article/details/87431066