本文實例為大家分享了java使用poi導出excel的具體代碼，供大家參考，具體內容如下
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package hyss.util.common;import java.io.ioexception;import java.io.outputstream;import java.net.urlencoder;import java.util.arraylist;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.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.hssf.util.hssfcolor;import org.apache.poi.ss.util.cellrangeaddress;/** * excel導出工具類 * @author ts */public class exportexcelutil { //顯示的導出表的標題 private string title; //導出表的列名 private string[] rowname ; private list<object[]> datalist = new arraylist<object[]>(); // httpservletresponse response; //構造方法，傳入要導出的數據 public exportexcelutil(string title,string[] rowname,list<object[]> datalist){ this.datalist = datalist; this.rowname = rowname; this.title = title; } /* * 導出數據 * */ public void export() throws exception{ try{ hssfworkbook workbook = new hssfworkbook(); // 創建工作簿對象 hssfsheet sheet = workbook.createsheet(title); // 創建工作表 // 產生表格標題行 hssfrow rowm = sheet.createrow(0); hssfcell celltiltle = rowm.createcell(0); rowm.setheightinpoints(25); //設置標題行默認行高 //sheet樣式定義【getcolumntopstyle()/getstyle()均為自定義方法 - 在下面 - 可擴展】 hssfcellstyle columntitlestyle = this.gettitletopstyle(workbook);//獲取標題行樣式 hssfcellstyle columntopstyle = this.getcolumntopstyle(workbook); //獲取列頭樣式對象 hssfcellstyle style = this.getstyle(workbook); //單元格樣式對象 sheet.addmergedregion(new cellrangeaddress(0, 1, 0, (rowname.length-1))); celltiltle.setcellstyle(columntitlestyle); celltiltle.setcellvalue(title); // 定義所需列數 int columnnum = rowname.length; hssfrow rowrowname = sheet.createrow(2); // 在索引2的位置創建行(最頂端的行開始的第二行) rowrowname.setheightinpoints(25); //將列頭設置默認行高 // 將列頭設置到sheet的單元格中 for(int n=0;n<columnnum;n++){ hssfcell cellrowname = rowrowname.createcell(n); //創建列頭對應個數的單元格 cellrowname.setcelltype(hssfcell.cell_type_string); //設置列頭單元格的數據類型 hssfrichtextstring text = new hssfrichtextstring(rowname[n]); cellrowname.setcellvalue(text); //設置列頭單元格的值 cellrowname.setcellstyle(columntopstyle); //設置列頭單元格樣式 } //將查詢出的數據設置到sheet對應的單元格中 for(int i=0;i<datalist.size();i++){ object[] obj = datalist.get(i);//遍歷每個對象 hssfrow row = sheet.createrow(i+3);//創建所需的行數 row.setheightinpoints(20); //將創建出的行設置默認行高 for(int j=0; j<obj.length; j++){ hssfcell cell = null; //設置單元格的數據類型 if(j == 0){ cell = row.createcell(j,hssfcell.cell_type_numeric); cell.setcellvalue(i+1); }else{ cell = row.createcell(j,hssfcell.cell_type_string); if(!"".equals(obj[j]) && obj[j] != null){ cell.setcellvalue(obj[j].tostring()); //設置單元格的值 } } cell.setcellstyle(style); //設置單元格樣式 } } //讓列寬隨著導出的列長自動適應 for (int colnum = 0; colnum < columnnum; colnum++) { int columnwidth = sheet.getcolumnwidth(colnum) / 256; for (int rownum = 0; rownum < sheet.getlastrownum(); rownum++) { hssfrow currentrow; //當前行未被使用過 if (sheet.getrow(rownum) == null) { currentrow = sheet.createrow(rownum); } else { currentrow = sheet.getrow(rownum); } if (currentrow.getcell(colnum) != null) { hssfcell currentcell = currentrow.getcell(colnum); if (currentcell.getcelltype() == hssfcell.cell_type_string) { int length = currentcell.getstringcellvalue().getbytes().length; if (columnwidth < length) { columnwidth = length; } } } } if(colnum == 0){ sheet.setcolumnwidth(colnum, (columnwidth-2) * 256); }else{ sheet.setcolumnwidth(colnum, (columnwidth+4) * 256); } } if(workbook !=null){ try { string filename = title + datetime.getsystemdatetime("yyyy-mm-dd") + ".xls"; //因 response已經封裝成工具類所以下面這段代碼注釋掉// response =servletactioncontext.getresponse();// response.setcontenttype("application/octet-stream");// response.setheader("content-disposition", headstr);// outputstream out = response.getoutputstream(); //解決中文亂碼 struts2util.getresponse().setcharacterencoding("utf-8"); //解決中文亂碼 struts2util.getresponse().setheader("content-disposition", "attachment;filename*=utf-8''" + urlencoder.encode(filename,"utf-8")); //文件下載 struts2util.getresponse().setcontenttype("application/octet-stream"); outputstream out = struts2util.getresponse().getoutputstream(); workbook.write(out); } catch (ioexception e) { e.printstacktrace(); } } }catch(exception e){ e.printstacktrace(); } } /* * 設置標題樣式 */ public hssfcellstyle gettitletopstyle(hssfworkbook workbook) { // 設置字體 hssffont font = workbook.createfont(); //設置字體大小 font.setfontheightinpoints((short)24); //字體加粗 font.setboldweight(hssffont.boldweight_bold); //設置字體名字 font.setfontname("宋體"); //設置樣式; hssfcellstyle style = workbook.createcellstyle(); //設置底邊框; style.setborderbottom(hssfcellstyle.border_thin); //設置底邊框顏色; style.setbottombordercolor(hssfcolor.black.index); //設置左邊框; style.setborderleft(hssfcellstyle.border_thin); //設置左邊框顏色; style.setleftbordercolor(hssfcolor.black.index); //設置右邊框; style.setborderright(hssfcellstyle.border_thin); //設置右邊框顏色; style.setrightbordercolor(hssfcolor.black.index); //設置頂邊框; style.setbordertop(hssfcellstyle.border_thin); //設置頂邊框顏色; style.settopbordercolor(hssfcolor.black.index); //在樣式用應用設置的字體; style.setfont(font); //設置自動換行; style.setwraptext(false); //設置水平對齊的樣式為居中對齊; style.setalignment(hssfcellstyle.align_center); //設置垂直對齊的樣式為居中對齊; style.setverticalalignment(hssfcellstyle.vertical_center); return style; } /* * 列頭單元格樣式 */ public hssfcellstyle getcolumntopstyle(hssfworkbook workbook) { // 設置字體 hssffont font = workbook.createfont(); //設置字體大小 font.setfontheightinpoints((short)11); //字體加粗 font.setboldweight(hssffont.boldweight_bold); //設置字體名字 font.setfontname("宋體"); //設置樣式; hssfcellstyle style = workbook.createcellstyle(); //設置底邊框; style.setborderbottom(hssfcellstyle.border_thin); //設置底邊框顏色; style.setbottombordercolor(hssfcolor.black.index); //設置左邊框; style.setborderleft(hssfcellstyle.border_thin); //設置左邊框顏色; style.setleftbordercolor(hssfcolor.black.index); //設置右邊框; style.setborderright(hssfcellstyle.border_thin); //設置右邊框顏色; style.setrightbordercolor(hssfcolor.black.index); //設置頂邊框; style.setbordertop(hssfcellstyle.border_thin); //設置頂邊框顏色; style.settopbordercolor(hssfcolor.black.index); //在樣式用應用設置的字體; style.setfont(font); //設置自動換行; style.setwraptext(false); //設置水平對齊的樣式為居中對齊; style.setalignment(hssfcellstyle.align_center); //設置垂直對齊的樣式為居中對齊; style.setverticalalignment(hssfcellstyle.vertical_center); return style; } /* * 列數據信息單元格樣式 */ public hssfcellstyle getstyle(hssfworkbook workbook) { // 設置字體 hssffont font = workbook.createfont(); //設置字體大小 //font.setfontheightinpoints((short)10); //字體加粗 //font.setboldweight(hssffont.boldweight_bold); //設置字體名字 font.setfontname("宋體"); //設置樣式; hssfcellstyle style = workbook.createcellstyle(); //設置底邊框; style.setborderbottom(hssfcellstyle.border_thin); //設置底邊框顏色; style.setbottombordercolor(hssfcolor.black.index); //設置左邊框; style.setborderleft(hssfcellstyle.border_thin); //設置左邊框顏色; style.setleftbordercolor(hssfcolor.black.index); //設置右邊框; style.setborderright(hssfcellstyle.border_thin); //設置右邊框顏色; style.setrightbordercolor(hssfcolor.black.index); //設置頂邊框; style.setbordertop(hssfcellstyle.border_thin); //設置頂邊框顏色; style.settopbordercolor(hssfcolor.black.index); //在樣式用應用設置的字體; style.setfont(font); //設置自動換行; style.setwraptext(false); //設置水平對齊的樣式為居中對齊; // style.setalignment(hssfcellstyle.align_center); //設置垂直對齊的樣式為居中對齊; // style.setverticalalignment(hssfcellstyle.vertical_center); return style; } } |
實現方法
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/** 實現方法*/public void exportexcel() throws exception{ string title = "測試"; string[] rowsname = new string[]{"序號","列頭1","列頭2","列頭3","列頭4","列頭5"}; list<object[]> datalist = new arraylist<object[]>(); object[] objs = null; for (int i = 0; i < 10; i++) { objs = new object[rowsname.length]; objs[0] = i; objs[1] = "測試1"; objs[2] = "測試2"; objs[3] = "測試3"; objs[4] = "測試4"; objs[5] = "測試5"; datalist.add(objs); } exportexcelutil ex = new exportexcelutil(title, rowsname, datalist); ex.export(); } |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://www.cnblogs.com/jiaobaobao/archive/2018/08/16/9485905.html
