jxl操作Excel输出流

-----------java code-------------

package com.primeton.eos.arp.excel;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import com.primeton.tp.core.bizservice.EOSParameter;

import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
/**
 * @author 胡晶
 * @version 1.0
 * @date 2009-6-15
 * @class_displayName ExpExcelUtil
 */

public class ExpExcelUtil {
 private WritableWorkbook wwb = null;

 private Workbook wb = null;

 private WritableSheet ws = null;

 private ByteArrayOutputStream outStream =new ByteArrayOutputStream();
 
 private int startRow = 0; //拼SQL查询，写excel起始行列
 
 private int startCol = 0;
 /**
  * 构造方法，创建空的excel表，默认读取第一个sheet
  *
  */
 public ExpExcelUtil(){
  try{
   wwb = Workbook.createWorkbook(outStream);
   wwb.createSheet("sheet1", 1);
   ws = wwb.getSheet(0);
  }catch(Exception e){
   e.printStackTrace();
  } 
 }
 
 /**
  * 构造方法，根据配置excel信息初始化excel模板，默认读取第一个sheet
  * @param TEMPLATEID
  */
 public ExpExcelUtil(String TEMPLATEID){
  EOSParameter param=new EOSParameter();
  InputStream inStream = null;
  Connection conn=null;
  Statement stmt=null;
  ResultSet rs=null;
  //查出配置excel模板
  String sql = "SELECT FILEBODY FROM TEMPLATE_FILE WHERE RECORDID="+ "'"+TEMPLATEID+"'";

  try {
   conn=param.getDBBroker().getConnection();
   stmt=conn.prepareStatement(sql);
   rs=stmt.executeQuery(sql);
   if (rs.next()) {
    inStream = rs.getBlob("FILEBODY").getBinaryStream();
   }
   
   if ("".equals(inStream) || inStream == null) {
    wwb = Workbook.createWorkbook(outStream);
    wwb.createSheet("sheet1", 1);
   } else {
    wb = Workbook.getWorkbook(inStream);
    inStream.close();
    
    wwb = Workbook.createWorkbook(outStream, wb);
   }
   ws = wwb.getSheet(0);
   
  } catch (Exception e) {
   e.printStackTrace();
  } finally{
   if(stmt!=null){
    try {
     stmt.close();
    } catch (SQLException e) {
     e.printStackTrace();
    }
   }
   if(conn!=null){
    try {
     conn.close();
    } catch (SQLException e) {
     e.printStackTrace();
    }
   }  
  }
 }
 
 /**
  * 构造方法,根据输入流，初始化Excel，默认读取第一个sheet
  * @param InputStream
  */
 public ExpExcelUtil(InputStream is) {
  try {
   wb = Workbook.getWorkbook(is);
   wwb = Workbook.createWorkbook(outStream, wb);
   ws = wwb.getSheet(0);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 /**
  * 拼SQL查询前，设置起始行列
  * @param col
  * @param row
  */
 public void querySetStart(int col,int row){
  this.startCol = col;
  this.startRow = row;
 }
 
 /**
  * 拼SQL查询数据导入EXCEL
  * @param entityName
  * @param Stinrg[] expFields
  * @param whereSql
  */
 public void queryWithSql(String entityName,String[] expFields,String whereSql){
  EOSParameter param=new EOSParameter();
  Connection conn=null;
  Statement stmt=null;
  ResultSet rs=null;
  
  String sql="select ";
  for(int i=0;i<expFields.length;i++){
   sql+=expFields[i]+",";
  }
  sql=sql.substring(0,sql.lastIndexOf(","));
  sql+=" from "+entityName+" "+whereSql;
  System.out.println(sql);
  
  try{
   conn=param.getDBBroker().getConnection();
   stmt=conn.prepareStatement(sql);
   rs=stmt.executeQuery(sql);
   int j=0;
   while(rs.next()){
    for(int i=0;i<expFields.length;i++){
     ws.addCell(new Label(i+startCol,j+startRow,rs.getString(expFields[i])));
    }
    j++;
   }
  }catch(Exception e){
   e.printStackTrace();
  }
 }
 
 /**
  * 查出表中所有字段名称
  * return List
  */
 public List getAllFields(String tableName){
  EOSParameter param=new EOSParameter();
  Connection conn=null;
  Statement stmt=null;
  ResultSet rs=null;
  
  String sql= "select column_name from user_tab_columns where table_name = '"+tableName+"'";
  List list=new ArrayList();
  try{
   conn=param.getDBBroker().getConnection();
   stmt=conn.prepareStatement(sql);
   rs=stmt.executeQuery(sql);
   while (rs.next()) {
    list.add(rs.getString("column_name"));
   }
  }catch(Exception e){
   e.printStackTrace();
  }
  return list;
 }
 
 /**
  * 设置当前操作sheet，如果不存在，创建新的sheet
  * @param sheetNum
  */
 public void setSheet(int sheetNum){
  if(sheetNum>=wwb.getNumberOfSheets()){
   int t=wwb.getNumberOfSheets();
   try {
    wwb.createSheet("sheet"+t, t);
    ws=wwb.getSheet(t);
   } catch (Exception e) {
    e.printStackTrace();
   } 
  }else{
   ws = wwb.getSheet(sheetNum);
  }
 }
 
 /**
  * 设置当前操作sheet名称
  * @param sheetName
  */
 public void setSheetName(String sheetName){
  ws.setName(sheetName);
 }
 
 /**
  * 创建新的sheet，并把操作定位到当前sheet
  * @param sheetName
  */
 public void createSheet(String sheetName){
  int t=wwb.getNumberOfSheets();
  try {
   wwb.createSheet(sheetName, t);
   ws=wwb.getSheet(t);
  } catch (Exception e) {
   e.printStackTrace();
  }  
 }
 
 /**
  * 返回sheet数
  * @return
  */
 public int getNumberOfSheets(){
  return wwb.getNumberOfSheets();
 }
 
 /**
  * 返回当前sheet行数
  * @return int
  */
 public int getRows(){
  return ws.getRows();
 }
 
 /**
  * 返回当前sheet列数
  * @return int
  */
 public int getColumns(){
  return ws.getColumns();
 }
 
 /**
  * 合并单元格
  * @param col1
  * @param row1
  * @param col2
  * @param row2
  */
 public void mergeCells(int col1,int row1,int col2,int row2){
  try {
   ws.mergeCells(col1,row1,col2,row2);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 /**
  * 设置单元格大小，width、height为0则不做修改
  * @param col
  * @param row
  * @param width
  * @param height
  */
 public void setCellSize(int col,int row,int width,int height){
  try {
   ws.setColumnView(col, width);
   ws.setRowView(row, height);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 /**
  * 删除行
  * @param row
  */
 public void removeRow(int row){ 
  try {
   ws.removeRow(row);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 /**
  * 删除列
  * @param col
  */
 public void removeColumn(int col){ 
  try {
   ws.removeColumn(col);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 /**
  * 增加Cell
  * @param col
  * @param row
  * @param str
  */
 public void addCell(int col,int row,String str){
  try {
   ws.addCell(new Label(col,row,str));
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 /**
  * 增加Cell
  * @param cell
  */
 public void addCell(Label cell){
  try {
   ws.addCell(cell);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 /**
  * 增加Cell，设置字大小
  * @param col
  * @param row
  * @param str
  * @param size
  */
 public void addCell(int col,int row,String str,int size){
  WritableCellFormat wcf=new WritableCellFormat(new WritableFont(WritableFont.ARIAL,size));  
  try {
   ws.addCell(new Label(col,row,str,wcf));
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 /**
  * 写Excel
  */
 public void write(){
  try{
   wwb.write();
  }catch(Exception e){
   e.printStackTrace();
  }
 }
 
 /**
  * 返回输出
  * @return ByteArrayOutputStream
  */
 public ByteArrayOutputStream outExcel(){
  try{
   if(wb!=null){
    wb.close();
   }
   if(wwb!=null){
    wwb.close();
   }
  }catch(Exception e){
   e.printStackTrace();
  }
  return outStream;
 }
}

 

--------------jsp file-----------------

<%@page import="com.primeton.eos.arp.excel.ExpExcelUtil,java.io.ByteArrayOutputStream"%>
<%
 ExpExcelUtil eeu = new ExpExcelUtil();
 eeu.addCell(1,1,"This is My Cell");
 eeu.write();
 ByteArrayOutputStream outStream= eeu.outExcel();
 response.reset();
 response.setContentType("application/x-msdownload");  
 response.setHeader("Content-Disposition",   "attachment;   filename="+new String(("导出excel.xls").getBytes(),"iso8859-1"));  
 ServletOutputStream sos = response.getOutputStream();
 outStream.writeTo(sos);
 out.clear();
 out = pageContext.pushBody();
 %>