连接数据库查询 将查询结果写入exce文件中

package com.cn.peitest.connectDatabase;

import java.io.File;
import java.lang.reflect.Field;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.alibaba.fastjson.JSONObject;
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
/**
 * 连接数据库查询 将查询结果写入exce文件中
 * @author Pei
 *
 */
public class WritterToExcel {
	public static void main(String[] args) {
		//连接数据库
		//声明
		Connection con;
		//驱动程序名称
		String driver="com.mysql.jdbc.Driver";
		//路径
		String url="jdbc:mysql://localhost:3306/peixian?serverTimezone=UTC";
		//用户名
		String name="root";
		//密码
		String password="123456";
		try {
			//加载驱动程序
			Class.forName(driver);
			con=DriverManager.getConnection(url,name,password);
			if(!con.isClosed()) {
				 System.out.println("\n\t\t成功以 " + name + " 身份连接到数据库！！！");
			}
			 // 2.创建statement类对象，用来执行SQL语句！！
			Statement st=con.createStatement();
			String sql="select * from pei_user_baseinf";
			 // 3.ResultSet类，用来存放获取的结果集！！
			ResultSet rs=st.executeQuery(sql);
			ResultSetMetaData rsd=rs.getMetaData();
			int count=rsd.getColumnCount();
			System.out.println(rs);
			List<Map<String,Object>>list=new ArrayList<Map<String,Object>>();
			while(rs.next()){
				Map<String,Object>map=new HashMap<String,Object>();
				for(int i=1;i<=count;i++) {
					map.put(rsd.getColumnName(i), rs.getObject(i));
				}
				list.add(map);
			}
			System.out.println("list======"+list);
			excelOut(list);

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	//将数据导出到Excel
		public static void excelOut(List<Map<String, Object>> list2) {
			List<UserBaseinf>list=new ArrayList<UserBaseinf>();
			for(Map<String,Object>map:list2) {
				UserBaseinf userBaseinf=JSONObject.parseObject(JSONObject.toJSONString(map), UserBaseinf.class);
				list.add(userBaseinf);
			}
			WritableWorkbook bWorkbook = null;
			try {
				// 创建Excel对象
				bWorkbook = Workbook.createWorkbook(new File("D:/book.xls"));
				// 通过Excel对象创建一个选项卡对象
				WritableSheet sheet = bWorkbook.createSheet("sheet1", 0);
				//使用循环将数据读出
				for (int i =0; i < list.size(); i++) {
					UserBaseinf book=list.get(i);
					  Class cls = book.getClass();
				        Field[] fields = cls.getDeclaredFields();
				        for(int j=0; j<fields.length; j++){
				            Field f = fields[j];
				            f.setAccessible(true);
				            System.out.println("属性名:" + f.getName() + " 属性值:" + f.get(book));
				            Label label=new Label(j,i,String.valueOf(f.get(book)));//j控制行，i控制列
				            sheet.addCell(label);
				        }   

				}

				// 创建一个单元格对象，第一个为列，第二个为行，第三个为值
				Label label = new Label(0, 2, "test");
				// 将创建好的单元格放入选项卡中
				//sheet.addCell(label);
				// 写如目标路径
				bWorkbook.write();

			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} finally {
				try {
					bWorkbook.close();
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}

		}

}

　　

//实体类
package com.cn.peitest.connectDatabase;

import java.io.Serializable;

public class UserBaseinf implements Serializable {

	/**
	 *
	 */
	private static final long serialVersionUID = 1L;
	  private String phone_no;
	  private String pass_word;
	  private String company_name;
	  private String user_addres;
	  private String sex;
	  private String user_name;
	  private String register_time;
	  private String approval_status;
	public String getPhone_no() {
		return phone_no;
	}
	public void setPhone_no(String phone_no) {
		this.phone_no = phone_no;
	}
	public String getPass_word() {
		return pass_word;
	}
	public void setPass_word(String pass_word) {
		this.pass_word = pass_word;
	}
	public String getCompany_name() {
		return company_name;
	}
	public void setCompany_name(String company_name) {
		this.company_name = company_name;
	}
	public String getUser_addres() {
		return user_addres;
	}
	public void setUser_addres(String user_addres) {
		this.user_addres = user_addres;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public String getUser_name() {
		return user_name;
	}
	public void setUser_name(String user_name) {
		this.user_name = user_name;
	}
	public String getRegister_time() {
		return register_time;
	}
	public void setRegister_time(String register_time) {
		this.register_time = register_time;
	}
	public String getApproval_status() {
		return approval_status;
	}
	public void setApproval_status(String approval_status) {
		this.approval_status = approval_status;
	}
	public static long getSerialversionuid() {
		return serialVersionUID;
	}
	@Override
	public String toString() {
		return "UserBaseinf [phone_no=" + phone_no + ", pass_word=" + pass_word + ", company_name=" + company_name
				+ ", user_addres=" + user_addres + ", sex=" + sex + ", user_name=" + user_name + ", register_time="
				+ register_time + ", approval_status=" + approval_status + "]";
	}

}

　　

//pom.xml文件
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.cn</groupId>
  <artifactId>peitest</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>peitest</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
	 <dependency>
	    <groupId>org.apache.directory.studio</groupId>
	    <artifactId>org.apache.commons.codec</artifactId>
	    <version>1.8</version>
	</dependency>
	 <dependency>
		<groupId>net.sourceforge.jexcelapi</groupId>
		<artifactId>jxl</artifactId>
		<version>2.6.12</version>
	</dependency>
	<dependency>
		<groupId>org.apache.poi</groupId>
		<artifactId>poi-ooxml</artifactId>
		<version>3.9</version>
	</dependency>
<dependency>
   <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.54</version>
</dependency>

  </dependencies>

</project>