springmvc匯出excel並彈出下載框
加入對應的jar包,包括springmvc,poi的,
<!-- poi -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-examples</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-scratchpad</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-excelant</artifactId>
<version>${poi.version}</version>
</dependency>
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:
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 classDownloadAct{
@RequestMapping(value="download_project.do")
public String download(HttpServletRequest request,HttpServletResponse response) throws IOException{
String fileName="excel檔案";
//填充projects資料
List<Project> projects=createData();
List<Map<String,Object>> list=createExcelRecord(projects);
String columnNames[]={"ID","專案名","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);
// 設定response引數,可以開啟下載頁面
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
//自己實現
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:
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;
/**
* 匯出Excel文件工具類
* [@author](http://my.oschina.net/arthor) 那位先生
* [@date](http://my.oschina.net/u/2504391) 2014-8-6
* */
public classExcelUtil{
/**
* 建立excel文件,
* [@param](http://my.oschina.net/u/2303379) list 資料
* @param keys list中map的key陣列集合
* @param columnNames excel的列名
* */
public static Workbook createWorkBook(List<Map<String, Object>> list,String []keys,String columnNames[]) {
// 建立excel工作簿
Workbook wb = new HSSFWorkbook();
// 建立第一個sheet(頁),並命名
Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString());
// 手動設定列寬。第一個引數表示要為第幾列設;,第二個引數表示列的寬度,n為列高的畫素數。
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();
// 建立兩種字型
Font f = wb.createFont();
Font f2 = wb.createFont();
// 建立第一種字型樣式(用於列名)
f.setFontHeightInPoints((short) 10);
f.setColor(IndexedColors.BLACK.getIndex());
f.setBoldweight(Font.BOLDWEIGHT_BOLD);
// 建立第二種字型樣式(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());
// 設定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);
// 設定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);
//設定列名
for(int i=0;i<columnNames.length;i++){
Cell cell = row.createCell(i);
cell.setCellValue(columnNames[i]);
cell.setCellStyle(cs);
}
//設定每行每列的值
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頁面中新增
<input type="button" value="匯出資料" onclick="download()"/>
js中新增
functiondownload(){
var url="download_customer.do";
window.open(url);
}
問題:可能有些瀏覽器會把window.open(url)這個操作給禁止掉,所以會出現程式碼執行結束但是彈出框不出現的情況,遇到這種情況,最簡單的方法就是使用location.href=url;如果一定要新視窗彈出,建議google一下如何解決window.open()被瀏覽器禁止的替換方法。