加入對應的jar包,包括springmvc,poi的,java
spring jar包在此不列舉出來,主要是poi包,以下圖所示spring
(圖掛了看這裏:http://cafebabe.cn/study/2015/11/21/springmvn-export-excel/) 實體類:apache
public class Project { private Integer id; private String name; private String technology;//所用技術 private String remarks;//備註 //省略setter/getter }
控制器類:數組
import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Controller; import com.entity.Project; import com.util.ExcelUtil; [@Controller](http://my.oschina.net/u/1774615) public class DownloadAct { @RequestMapping(value="download_project.do") public String download(HttpServletRequest request,HttpServletResponse response) throws IOException{ String fileName="excel文件"; //填充projects數據 List<Project> projects=createData(); List<Map<String,Object>> list=createExcelRecord(projects); String columnNames[]={"ID","項目名","銷售人","負責人","所用技術","備註"};//列名 String keys[] = {"id","name","saler","principal","technology","remarks"};//map中的key ByteArrayOutputStream os = new ByteArrayOutputStream(); try { ExcelUtil.createWorkBook(list,keys,columnNames).write(os); } catch (IOException e) { e.printStackTrace(); } byte[] content = os.toByteArray(); InputStream is = new ByteArrayInputStream(content); // 設置response參數,能夠打開下載頁面 response.reset(); response.setContentType("application/vnd.ms-excel;charset=utf-8"); response.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".xls").getBytes(), "iso-8859-1")); ServletOutputStream out = response.getOutputStream(); BufferedInputStream bis = null; BufferedOutputStream bos = null; try { bis = new BufferedInputStream(is); bos = new BufferedOutputStream(out); byte[] buff = new byte[2048]; int bytesRead; // Simple read/write loop. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesRead); } } catch (final IOException e) { throw e; } finally { if (bis != null) bis.close(); if (bos != null) bos.close(); } return null; } private List<Project> createData() { // TODO Auto-generated method stub //本身實現 return null; } private List<Map<String, Object>> createExcelRecord(List<Project> projects) { List<Map<String, Object>> listmap = new ArrayList<Map<String, Object>>(); Map<String, Object> map = new HashMap<String, Object>(); map.put("sheetName", "sheet1"); listmap.add(map); Project project=null; for (int j = 0; j < projects.size(); j++) { project=projects.get(j); Map<String, Object> mapValue = new HashMap<String, Object>(); mapValue.put("id", project.getId()); mapValue.put("name", project.getName()); mapValue.put("technology", project.getTechnology()); mapValue.put("remarks", project.getRemarks()); listmap.add(mapValue); } return listmap; } }
Excel工具類:瀏覽器
import java.util.List; import java.util.Map; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellStyle; import org.apache.poi.ss.usermodel.Font; import org.apache.poi.ss.usermodel.IndexedColors; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; /** * 導出Excel文檔工具類 * [@author](http://my.oschina.net/arthor) 那位先生 * [@date](http://my.oschina.net/u/2504391) 2014-8-6 * */ public class ExcelUtil { /** * 建立excel文檔, * [@param](http://my.oschina.net/u/2303379) list 數據 * @param keys list中map的key數組集合 * @param columnNames excel的列名 * */ public static Workbook createWorkBook(List<Map<String, Object>> list,String []keys,String columnNames[]) { // 建立excel工做簿 Workbook wb = new HSSFWorkbook(); // 建立第一個sheet(頁),並命名 Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString()); // 手動設置列寬。第一個參數表示要爲第幾列設;,第二個參數表示列的寬度,n爲列高的像素數。 for(int i=0;i<keys.length;i++){ sheet.setColumnWidth((short) i, (short) (35.7 * 150)); } // 建立第一行 Row row = sheet.createRow((short) 0); // 建立兩種單元格格式 CellStyle cs = wb.createCellStyle(); CellStyle cs2 = wb.createCellStyle(); // 建立兩種字體 Font f = wb.createFont(); Font f2 = wb.createFont(); // 建立第一種字體樣式(用於列名) f.setFontHeightInPoints((short) 10); f.setColor(IndexedColors.BLACK.getIndex()); f.setBoldweight(Font.BOLDWEIGHT_BOLD); // 建立第二種字體樣式(用於值) f2.setFontHeightInPoints((short) 10); f2.setColor(IndexedColors.BLACK.getIndex()); // Font f3=wb.createFont(); // f3.setFontHeightInPoints((short) 10); // f3.setColor(IndexedColors.RED.getIndex()); // 設置第一種單元格的樣式(用於列名) cs.setFont(f); cs.setBorderLeft(CellStyle.BORDER_THIN); cs.setBorderRight(CellStyle.BORDER_THIN); cs.setBorderTop(CellStyle.BORDER_THIN); cs.setBorderBottom(CellStyle.BORDER_THIN); cs.setAlignment(CellStyle.ALIGN_CENTER); // 設置第二種單元格的樣式(用於值) cs2.setFont(f2); cs2.setBorderLeft(CellStyle.BORDER_THIN); cs2.setBorderRight(CellStyle.BORDER_THIN); cs2.setBorderTop(CellStyle.BORDER_THIN); cs2.setBorderBottom(CellStyle.BORDER_THIN); cs2.setAlignment(CellStyle.ALIGN_CENTER); //設置列名 for(int i=0;i<columnNames.length;i++){ Cell cell = row.createCell(i); cell.setCellValue(columnNames[i]); cell.setCellStyle(cs); } //設置每行每列的值 for (short i = 1; i < list.size(); i++) { // Row 行,Cell 方格 , Row 和 Cell 都是從0開始計數的 // 建立一行,在頁sheet上 Row row1 = sheet.createRow((short) i); // 在row行上建立一個方格 for(short j=0;j<keys.length;j++){ Cell cell = row1.createCell(j); cell.setCellValue(list.get(i).get(keys[j]) == null?" ": list.get(i).get(keys[j]).toString()); cell.setCellStyle(cs2); } } return wb; } }
在jsp頁面中添加mvc
<input type="button" value="導出數據" onclick="download()"/>
js中添加app
function download(){ var url="download_customer.do"; window.open(url); }
問題:可能有些瀏覽器會把window.open(url)這個操做給禁止掉,因此會出現代碼運行結束可是彈出框不出現的狀況,遇到這種狀況,最簡單的方法就是使用location.href=url;若是必定要新窗口彈出,建議google一下如何解決window.open()被瀏覽器禁止的替換方法。jsp