關於POI導出到Excel表格中（servlet中）

本人用的時mysql數據庫，其中需要的包如下圖，需要你自己百度去下載

項目下的包和類的截圖：

studentSerlet.java

package com.neusoft.ctr;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.neusoft.Dao.impl.OperaterStudent;
import com.neusoft.entity.Student;
import com.neusoft.poi.ToExcel;

public class studentServlet extends HttpServlet {

	

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doPost(request, response);
		
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		String amethod = request.getParameter("Allmethod");
		System.out.println(amethod);
		if(""!=amethod && "allStudent".endsWith(amethod)){
			this.doAllStudent(request, response);
		}else if(""!=amethod && "toexcel".endsWith(amethod)){
			this.doExcel(request, response);
		}else{
			System.out.println("沒有和前臺獲取到數據");
		}
	}

	/**
	 * 
	 * @param request
	 * @param response
	 * @throws ServletException
	 * @throws IOException
	 */
	public void doAllStudent(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {
		List<Student> list = new OperaterStudent().getAllStudents();
        request.setAttribute("allstudent", list);
        System.out.println(list.size());
        for(int i = 1;i<list.size();i++){
        	Student s = (Student) list.get(i);
        	System.out.println(s.getName());
        }
        
        
        request.getRequestDispatcher("/allstudent.jsp").forward(request, response);
    }
	
	public void doExcel(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {
		
		ResultSet rs  = new OperaterStudent().getTheStudent();
		ToExcel toExcel = new ToExcel();
		toExcel.resultSetToExcel(rs, "D://student.xls", "學生信息");
		request.getRequestDispatcher("/index.jsp").forward(request, response);
		
   }

}

GetAllStudent.java

 

package com.neusoft.Dao;

import java.sql.ResultSet;
import java.util.List;

import com.neusoft.entity.Student;

public interface GetAllStudent {

	public List<Student> getAllStudents();
	
	public ResultSet getTheStudent();
}

OperaterStudent.java

package com.neusoft.Dao.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;



import com.neusoft.Dao.GetAllStudent;
import com.neusoft.entity.Student;
import com.neusoft.poi.DBTools;

public class OperaterStudent implements GetAllStudent {

	public List<Student> getAllStudents() {
		Connection conn = DBTools.getConnection();
		String sql  = "select *from student";
		Student student = null;
		List<Student> studentList = new ArrayList<Student>();
		try {
			PreparedStatement pstst = conn.prepareStatement(sql);
			ResultSet rs = pstst.executeQuery();
			while(rs.next()){
				student = new Student();
				student.setId(rs.getInt(1));
				student.setName(rs.getString(2));
				student.setSex(rs.getString(3));
				student.setTel(rs.getString(4));
				student.setAddress(rs.getString(5));
			
				studentList.add(student);
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return studentList;
	}

	public ResultSet getTheStudent() {
		// TODO Auto-generated method stub
		Connection conn = DBTools.getConnection();
		String sql  = "select *from student";
	
		ResultSet rs = null;
		try {
			PreparedStatement pstst = conn.prepareStatement(sql);
			rs = pstst.executeQuery();
		}catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return rs;
	}
}

實體類Student

package com.neusoft.entity;

public class Student {
	private int id;
	private String name;
	private String sex;
	private String tel;
	private String address;
	public Student(){
		
	}
	public Student(int id, String name, String sex, String tel, String address) {
		this.id = id;
		this.name = name;
		this.sex = sex;
		this.tel = tel;
		this.address = address;
	}
	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 String getTel() {
		return tel;
	}
	public void setTel(String tel) {
		this.tel = tel;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	
	
	
}

核心的代碼：ToExcel.java

package com.neusoft.poi;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ToExcel {

	
	public void resultSetToExcel(ResultSet rs,String xlsName,String sheetName){
		System.out.println("----->>>>>.進入 toExcel方法中<<<<<<<-------");
		//產生一個工作簿
		HSSFWorkbook  hssfWorkbook  = new HSSFWorkbook();
		//產生一個工作表
		HSSFSheet hssfSheet = hssfWorkbook.createSheet();
		
		//設置工作表的名稱
		hssfWorkbook.setSheetName(0, sheetName);
		
		//創建第一行
		HSSFRow hssfRow= hssfSheet.createRow(0);
		//申明工作單元
		HSSFCell hssfCell ;
	    //結果集的字段名稱
		ResultSetMetaData md;
		
		try {
			
			//添加標題
			//some problem in this promblem
			md = rs.getMetaData();
			int nColumn = md.getColumnCount();
			
			System.out.println("列數："+nColumn); //測試
			for(int i = 1;i<=nColumn;i++){
				
				hssfCell = hssfRow.createCell(nColumn);
				
				
				System.out.println("標題：："+md.getColumnLabel(i));  //測試
				hssfCell.setCellValue(md.getColumnLabel(i));
			}
			//添加標題結束
			
			System.out.println("填充標題結束了");
			//填充值。。。。
			int iRow = 1;
			while(rs.next()){
				
				hssfRow = hssfSheet.createRow(iRow);
				for(int j=1;j<=nColumn;j++){
					
					hssfCell = hssfRow.createCell(j-1);
					
					System.out.println("對應的值："+rs.getObject(j).toString());
					
					hssfCell.setCellValue(rs.getObject(j).toString()); //測試
					
				}
				iRow++;
			}
			//填充結束
			
			//輸出到硬盤中
			FileOutputStream fos = new FileOutputStream(xlsName);
			hssfWorkbook.write(fos);
			
			
			fos.flush();
			fos.close();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		
	}
}

其餘的鏈接mysql數據庫的代碼自己寫，也可以去百度。。。