报表excel导入导出

导入excel：java代码如下：

private static final long serialVersionUID = -2201219701121037194L;
private String savePath="upload";
private ServletContext sc;
private ExcelWorkSheet<Ptoject> excelWorkSheet;

public void init(ServletConfig config) {
   // savePath = config.getInitParameter("savePath");
    sc = config.getServletContext();
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    request.setCharacterEncoding("UTF-8");
    DiskFileItemFactory factory = new DiskFileItemFactory();
    ServletFileUpload upload = new ServletFileUpload(factory);
    try {
        List items = upload.parseRequest(request);// 上传文件解析
        Iterator itr = items.iterator();// 枚举方法
        while (itr.hasNext()) {
            FileItem item = (FileItem) itr.next();
            if (item.isFormField()) {// 判断是文件还是文本信息
                System.out.println("表单参数名:" + item.getFieldName()
                        + "，表单参数值:" + item.getString("UTF-8"));
            } else {
                if (item.getName() != null && !item.getName().equals("")) {// 判断是否选择了文件
                    System.out.println("上传文件的大小:" + item.getSize());
                    System.out.println("上传文件的类型:" + item.getContentType());
                    // item.getName()返回上传文件在客户端的完整路径名称
                    System.out.println("上传文件的名称:" + item.getName());
                    // 此时文件暂存在服务器的内存当中
                    
                    File tempFile = new File(item.getName());// 构造临时对象
                    File file = new File(sc.getRealPath("/") + "upload",
                            tempFile.getName());
                    // 获取根目录对应的真实物理路径
                    item.write(file);// 保存文件在服务器的物理磁盘中

              //以上代码文servelt上传文件，下面为读取excel
                 Workbook workbook = createWorkbook(new FileInputStream(file),item.getName());
                 Sheet sheet = workbook.getSheetAt(0);
                 excelWorkSheet = new ExcelWorkSheet<Ptoject>();
                 excelWorkSheet.setSheetName(sheet.getSheetName());
                 Row firstRow = sheet.getRow(1);
                 Iterator<Cell> iterator = firstRow.iterator();
                 List<String> cellNames = new ArrayList<String>();
                 while (iterator.hasNext()) {
                    cellNames.add(iterator.next().getStringCellValue());
                }
                 excelWorkSheet.setColumns(cellNames);
                 
                 for(int i=2;i<=sheet.getLastRowNum();i++){
                     Row row = sheet.getRow(i);
                     Ptoject ptoject = new Ptoject();
                     ptoject.setLastproject(row.getCell(0).getStringCellValue());
                     ptoject.setNextproject(row.getCell(1).getStringCellValue());
                     ptoject.setMaindept(row.getCell(2).getStringCellValue());
                     ptoject.setAcotrdept(row.getCell(3).getStringCellValue());
                     ptoject.setBeizhu(row.getCell(4).getStringCellValue());
                     excelWorkSheet.getData().add(ptoject);
                 }
                 request.setAttribute("context",excelWorkSheet);
                 
                } else {
                    request.setAttribute("upload.message", "没有选择上传文件！");
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
        request.setAttribute("upload.message", "上传文件失败！");
    }
    request.getRequestDispatcher("/uploadResult.jsp").forward(request,
            response);
}
private Workbook createWorkbook(InputStream is,String filename) throws IOException{
    if (filename.toLowerCase().endsWith("xls")) {
        return new HSSFWorkbook(is);
    }else if (filename.toLowerCase().endsWith("xlsx")) {
        return new XSSFWorkbook(is);
    }
    return null;
}

ptoject.java代码如下

package org.test.entity;

public class Ptoject {
    String lastproject;
    String nextproject;
    String maindept;
    String acotrdept;
    String beizhu;
    public String getLastproject() {
        return lastproject;
    }
    public void setLastproject(String lastproject) {
        this.lastproject = lastproject;
    }
    public String getNextproject() {
        return nextproject;
    }
    public void setNextproject(String nextproject) {
        this.nextproject = nextproject;
    }
    public String getMaindept() {
        return maindept;
    }
    public void setMaindept(String maindept) {
        this.maindept = maindept;
    }
    public String getAcotrdept() {
        return acotrdept;
    }
    public void setAcotrdept(String acotrdept) {
        this.acotrdept = acotrdept;
    }
    public String getBeizhu() {
        return beizhu;
    }
    public void setBeizhu(String beizhu) {
        this.beizhu = beizhu;
    }
}

ExcelWorkSheet.java代码如下

package org.test.entity;

import java.util.ArrayList;
import java.util.List;

public class ExcelWorkSheet<T> {
    
    private String sheetName;
    private List<T> data = new ArrayList<T>(); 
    private List<String> columns;
    public String getSheetName() {
        return sheetName;
    }
    public void setSheetName(String sheetName) {
        this.sheetName = sheetName;
    }
    public List<T> getData() {
        return data;
    }
    public void setData(List<T> data) {
        this.data = data;
    }
    public List<String> getColumns() {
        return columns;
    }
    public void setColumns(List<String> columns) {
        this.columns = columns;
    }
    

}

html代码如下:

<form action="ReadExcelServlet" method="post"  enctype="multipart/form-data" >
        <input type="file" name="filename" ><br>
        <input type="submit" value="提交">
    </form>
//用来上传文件

<table border="1">
      <tr>
      <c:forEach items="${context.columns}" var="column">
              <td>${column}</td>
      </c:forEach>
      </tr>
    <c:forEach items="${context.data}" var="excel">
        <tr>
              <td>${excel.lastproject}</td>
              <td>${excel.nextproject}</td>
              <td>${excel.maindept}</td>
              <td>${excel.acotrdept}</td>
              <td>${excel.beizhu}</td>
          </tr>
    </c:forEach>
    </table>

//jsp读取excel中的值

生成excel:java代码如下：

    private String format="xlsx";
    private HttpServletResponse response;
    private String fileName;
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        this.doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("application/octet-stream;charset=utf-8");
        try {
            response.setHeader("Content-Disposition", "attachment;filename="+java.net.URLEncoder.encode(this.fileName,"utf-8"));
        } catch (Exception e) {
            // TODO: handle exception
        }
        //setFormat(request.getParameter("format"));
        format = request.getParameter("format");
        if ("xls".equals(format)) {
            this.fileName = "导出数据.xls";
        }
        if("xlsx".equals(format)){
            this.fileName = "导出数据.xlsx";
        }
        exportExcel(response.getOutputStream(), format);
        response.getOutputStream().flush();
        response.getOutputStream().close();
        
        // request.getRequestDispatcher("index.jsp").forward(request, response);
    }
    
    private void exportExcel(OutputStream os,String format){
        Workbook workbook = null;
        if("xls".equals(format)){
            workbook = new HSSFWorkbook();
        }
        if("xlsx".equals(format)){
            workbook = new XSSFWorkbook();
        }
        Sheet sheet = workbook.createSheet("学生信息");
        Row row = sheet.createRow(0);
        row.createCell(0).setCellValue("学号");
        row.createCell(1).setCellValue("姓名");
        row.createCell(2).setCellValue("性别");
        row.createCell(3).setCellValue("生日");
        CellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy"));
        List<Student> list = new ArrayList<Student>();
        Student student = new Student();
        student.setId(1);
        student.setName("李明");
        student.setSex("男");
        student.setBrithday(new Date());
        list.add(student);
        
        for(int i=0;i<list.size();i++){
            Row row2 = sheet.createRow(i+1);
            Student st= list.get(i);
            row2.createCell(0).setCellValue(st.getId());
            row2.createCell(1).setCellValue(st.getName());
            row2.createCell(2).setCellValue(st.getSex());
            Cell cell = row2.createCell(3);
            cell.setCellValue(st.getBrithday());
            cell.setCellStyle(cellStyle);
            
        }
        
        try {
            workbook.write(os);
        } catch (Exception e) {
            // TODO: handle exception
        }
    }

student.java代码：

package org.test.entity;

import java.util.Date;

public class Student {
    private int id;
    private String name;
    private String sex;
    private Date brithday;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public Date getBrithday() {
        return brithday;
    }
    public void setBrithday(Date brithday) {
        this.brithday = brithday;
    }
    

}

html代码：

 <a href="WriteExcelServlet?format=xls">将数据导出到Excel文件(.xls格式)</a><br>
      <a href="WriteExcelServlet?format=xlsx">将数据导出到Excel文件(.xlsx格式)</a>

所要导入的包：