如何用java实现mysql数据库的导入导出

Posted 2023-05-01

mysql导出数据库的命令如下：
Sql代码
mysqldump -uusername -ppassword -hhost -Pport exportDatabaseName > exportPath
mysqldump -uusername -ppassword -hhost -Pport exportDatabaseName > exportPath

利用Java调用命令窗口执行命令来进行MySql导入数据库一般分三步走：
第一步：登录Mysql数据库，在登录数据库的时候也可以指定登录到哪个数据库，如果指定了则可以跳过第二步；
第二步：切换数据库到需要导入的目标数据库
第三步：利用命令开始导入

在进行导出的时候，需要注意命令语句的运行环境，如果已经将mysql安装路径下的bin加入到
系统的path变量中，那么在导出的时候可以直接使用命令语句，否则，就需要在执行命令语句的
时候加上命令所在位置的路径，即mysql安装路径想的bin下的mysqldump命令。 参考技术A 　　

　　例如：
　　//连接MySql数据库，用户名和密码都是root
　　String url = "jdbc:mysql://localhost:3306/test" ;
　　String username = "root" ;
　　String password = "root" ;
　　try
　　Connection con =
　　DriverManager.getConnection(url , username , password ) ;
　　catch(SQLException se)
　　System.out.println("数据库连接失败！");
　　se.printStackTrace() ;
　　本回答被提问者采纳 参考技术B 看看jdbc 的操作

如何用Java导出数据存到excel里面

java中jxl导出数据到excel的例子
import jxl.*;
import jxl.write.*;
import java.io.*;
import java.io.File.*;
import java.util.*;

public class excel

public static void main(String[] args)


String targetfile = "c:/out.xls";//输出的excel文件名
String worksheet = "List";//输出的excel文件工作表名
String[] title = "ID","NAME","DESCRIB";//excel工作表的标题

WritableWorkbook workbook;
try

//创建可写入的Excel工作薄,运行生成的文件在tomcat/bin下
//workbook = Workbook.createWorkbook(new File("output.xls"));
System.out.println("begin");

OutputStream os=new FileOutputStream(targetfile);
workbook=Workbook.createWorkbook(os);

WritableSheet sheet = workbook.createSheet(worksheet, 0); //添加第一个工作表
//WritableSheet sheet1 = workbook.createSheet("MySheet1", 1); //可添加第二个工作
/*
jxl.write.Label label = new jxl.write.Label(0, 2, "A label record"); //put a label in cell A3, Label(column,row)
sheet.addCell(label);
*/

jxl.write.Label label;
for (int i=0; i<title.length; i++)

//Label(列号,行号 ,内容 )
label = new jxl.write.Label(i, 0, title[i]); //put the title in row1
sheet.addCell(label);


//下列添加的对字体等的设置均调试通过，可作参考用

//添加数字
jxl.write.Number number = new jxl.write.Number(3, 4, 3.14159); //put the number 3.14159 in cell D5
sheet.addCell(number);

//添加带有字型Formatting的对象
jxl.write.WritableFont wf = new jxl.write.WritableFont(WritableFont.TIMES,10,WritableFont.BOLD,true);
jxl.write.WritableCellFormat wcfF = new jxl.write.WritableCellFormat(wf);
jxl.write.Label labelCF = new jxl.write.Label(4,4,"文本",wcfF);
sheet.addCell(labelCF);

//添加带有字体颜色,带背景颜色 Formatting的对象
jxl.write.WritableFont wfc = new jxl.write.WritableFont(WritableFont.ARIAL,10,WritableFont.BOLD,false,jxl.format.UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.RED);
jxl.write.WritableCellFormat wcfFC = new jxl.write.WritableCellFormat(wfc);
wcfFC.setBackground(jxl.format.Colour.BLUE);
jxl.write.Label labelCFC = new jxl.write.Label(1,5,"带颜色",wcfFC);
sheet.addCell(labelCFC);

//添加带有formatting的Number对象
jxl.write.NumberFormat nf = new jxl.write.NumberFormat("#.##");
jxl.write.WritableCellFormat wcfN = new jxl.write.WritableCellFormat(nf);
jxl.write.Number labelNF = new jxl.write.Number(1,1,3.1415926,wcfN);
sheet.addCell(labelNF);

//3.添加Boolean对象
jxl.write.Boolean labelB = new jxl.write.Boolean(0,2,false);
sheet.addCell(labelB);

//4.添加DateTime对象
jxl.write.DateTime labelDT = new jxl.write.DateTime(0,3,new java.util.Date());
sheet.addCell(labelDT);

//添加带有formatting的DateFormat对象
jxl.write.DateFormat df = new jxl.write.DateFormat("ddMMyyyyhh:mm:ss");
jxl.write.WritableCellFormat wcfDF = new jxl.write.WritableCellFormat(df);
jxl.write.DateTime labelDTF = new jxl.write.DateTime(1,3,new java.util.Date(),wcfDF);
sheet.addCell(labelDTF);

//和宾单元格
//sheet.mergeCells(int col1,int row1,int col2,int row2);//左上角到右下角
sheet.mergeCells(4,5,8,10);//左上角到右下角
wfc = new jxl.write.WritableFont(WritableFont.ARIAL,40,WritableFont.BOLD,false,jxl.format.UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.GREEN);
jxl.write.WritableCellFormat wchB = new jxl.write.WritableCellFormat(wfc);
wchB.setAlignment(jxl.format.Alignment.CENTRE);
labelCFC = new jxl.write.Label(4,5,"单元合并",wchB);
sheet.addCell(labelCFC); //

//设置边框
jxl.write.WritableCellFormat wcsB = new jxl.write.WritableCellFormat();
wcsB.setBorder(jxl.format.Border.ALL,jxl.format.BorderLineStyle.THICK);
labelCFC = new jxl.write.Label(0,6,"边框设置",wcsB);
sheet.addCell(labelCFC);
workbook.write();
workbook.close();
catch(Exception e)

e.printStackTrace();

System.out.println("end");
Runtime r=Runtime.getRuntime();
Process p=null;
//String cmd[]="notepad","exec.java";
String cmd[]="C:\\Program Files\\Microsoft Office\\Office\\EXCEL.EXE","out.xls";
try
p=r.exec(cmd);

catch(Exception e)
System.out.println("error executing: "+cmd[0]);



参考技术A 一个用POI输出EXCEL的简单例子：

public static HSSFWorkbook writeExcel(String excelName,
List<String[]> list, List<String> firstRowValue)
HSSFRow row; // 数据行
HSSFCell cell; // 单元格

short maxCol = (short) firstRowValue.size();
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet(excelName);
HSSFCellStyle cellStyle = wb.createCellStyle();
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 水平布局：居中
cellStyle.setWrapText(true);

// 写入表头
for (short i = 0; i < firstRowValue.size(); i++)
row = sheet.createRow(0);
cell = row.createCell(i);
cell.setCellStyle(cellStyle);
cell.setCellValue(firstRowValue.get(i));

// 写入数据
for (int rowNo = 1; rowNo <= list.size(); rowNo++)
row = sheet.createRow(rowNo);
for (short colNo = 0; colNo < maxCol; colNo++)
if (!StringUtil.isNullOrEmpty(list.get(rowNo-1)[colNo]))
cell = row.createCell(colNo);
cell.setCellValue(list.get(rowNo - 1)[colNo]);



// 自动调整列宽
for (short i = 0; i < maxCol; i++)
sheet.autoSizeColumn(i);
sheet.setColumnWidth( i,
(short) (sheet.getColumnWidth(i)+ 500));

return wb;
参考技术B package org.wiki.excel.demo;

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

import org.wiki.excel.core.ExcelUtil;
import org.wiki.excel.entity.Record;

public class Test5
public static void main(String[] args) throws Exception

List<Record> recordList = new ArrayList<Record>();
String[] record1 ="1","张三","22","123","测试地址1";
recordList.add(new Record(0,record1));

String[] record2 ="2","李四","333","456","测试地址2";
recordList.add(new Record(1,record2));
//Excel标题列名
String[] fieldName = "序号","姓名","年龄","电话号码","地址";
ExcelUtil.exoprtToExcel("f:/export5.xls", recordList, fieldName);

System.out.println("导出成功...");


参考技术C 用 POI （http://poi.apache.org/）或者 JXL 参考技术D 使用jxl