java中的export方法实现导出excel文件

目录

• 1.export函数
• 2.导出列名
• 3.export实现方法
• 4.前端对接
• 5.前端代码

1.export函数

//导出文件接口
public String export(){
return this.myExport(exportList);
}

2.导出列名

private String myExport(List list){
com.bronzesoft.power.tools.json.JSONObject info = new com.bronzesoft.power.tools.json.JSONObject();
try{
List headList = new ArrayList(Arrays.asList("年", "月", "部门","部门负责人","经营值","收入", "支出","填报工时","标准工时","经营参数"));
Commonutil.export(list,headList,"部门经营总览导出");

info = Commonutil.setInfo(info,"部门经营总览导出");
}catch (Exception e){
LogUtil.error(this.getClass().getName()+".exportExcel()", e);
}
return info.toString();
}

3.export实现方法

​首先，理解一下一个Excel的文件的组织形式，一个Excel文件对应于一个workbook(XSSFWorkbook)，一个workbook可以有多个sheet（XSSFSheet）组成，一个sheet是由多个row（XSSFRow）组成，一个row是由多个cell（XSSFCell）组成。​

public static  boolean export(List list,List headList,String fileName){
return myExport(list,headList,fileName,com.bronzesoft.rdm.platform.util.Constants.PATH + com.bronzesoft.power.platform.Constants.TEMPFOLDER_DIR );
}
//将list导出为excel，文件名为fileName
public static  boolean myExport(List list,List headList,String fileName,String path){
try{
if(!checkListAndHead(list,headList)){
LogUtil.info( "head的长度有问题,导出的文件不正确" );
}
File file = new File(path + File.separator + fileName + ".xlsx");
if(!file.exists()) {
file.createNewFile();
}
//创建对应excel文件,存储路径path待确定
XSSFWorkbook workBook = new XSSFWorkbook();
//创建一个excel的sheet页
XSSFSheet sheet = workBook.createSheet(fileName);
XSSFRow row = null;
XSSFCell cell = null;

Map styles = StyleUtil.createStyles(workBook);

//表头样式
CellStyle headCenterIndex = styles.get("headCenter");
//列的样式居中，背景颜色为白色
CellStyle center = styles.get("centerWhite");
row = sheet.createRow(0);
//表头数据
for (int i = 0; i < headList.size(); i++) {
//创建列
cell = row.createCell(i);
//设置列的value
cell.setCellValue(headList.get(i));
//设置列的样式
cell.setCellStyle(headCenterIndex);
}
//表格数据

//写入表格数据
String codeName = "";
int rownum = 1;
T obj = null;

for(int i = 0; i < list.size(); i++){
obj = list.get(i);
if(null != obj){
Field[] fields = obj.getClass().getDeclaredFields();
row = sheet.createRow(rownum);
for(int j = 0; j< fields.length; j++){
fields[j].setAccessible(true);
codeName = String.valueOf(fields[j].get(obj));
//创建第j列
cell = row.createCell(j);
cell.setCellValue(Commonutil.getStringVal(codeName));
cell.setCellStyle(center);
}
}
rownum++;
}
// //i代表列，设置列的宽度
// for (int i = 0; i < headList.size(); i++) {
// if(i == 0){
// sheet.setColumnWidth(i, 2000);
// }else if(i == 1 || i == 3){
// sheet.setColumnWidth(i, 6000);
// }else{
// sheet.setColumnWidth(i, 4000);
// }
// }

//将文件写到临时目录
FileOutputStream out = new FileOutputStream(file);
workBook.write(out);

}catch (Exception e){
LogUtil.error(fileName + "export失败" );
}
return true;
}
//检查head的size是否符合规范
public static  boolean checkListAndHead(List list,List headList){
if(list.size()>0){
T t = list.get(0);
if(getColumnCount(t) != headList.size()){
LogUtil.info( "head的长度有问题" );
return false;
}
}
return true;
}
//获取一个对象成员变量的个数
public static  int getColumnCount(T t){
Field[] fields = t.getClass().getDeclaredFields();
int count = fields.length;
return count;
}

4.前端对接

public static JSONObject setInfo(JSONObject info,String fileName) throws Exception {
Storage s = Commonutil.getDefaultStorage();
info.put("port", String.valueOf(s.getPort()));
info.put("dirAddress", Base64Util.encode(com.bronzesoft.rdm.platform.util.Constants.PATH));
info.put("address", Base64Util.encode(com.bronzesoft.power.platform.Constants.TEMPFOLDER_DIR + File.separator + fileName + ".xlsx"));
info.put("name", Base64Util.encode(fileName));
info.put("extendName", "xlsx");
return info;
}

5.前端代码

function doExport(){
synAjax.tabCall("com.bronzesoft.rdm.SeDeptTotalTab", "export", null, function(data){
doDownload(data);
});
}

function doDownload(data){
console.log('data',data)
r = eval('('+data+')');

$("#_file_dir").val(r.dirAddress);
$("#_file_address").val(r.address);
$("#_file_name").val(r.name);
$("#_file_extname").val(r.extendName);

if ($.browser.safari) { $("#_file_downform").attr("target", ""); }
var servlet = powerPath + "download";


$("#_file_downform").attr("action", servlet).submit();
}

到此这篇关于java中的export方法实现导出excel文件的文章就介绍到这了,更多相关java导出excel文件内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！