怎么用java代码打开txt文件？

import java.awt.*; import java.io.*; import java.awt.event.*; import javax.swing.*; public class Test { public Test() { JFrame f=new JFrame("TEST"); Container c=f.getContentPane(); c.setLayout(new FlowLayout()); JButton b=new JButton("帮助"); b.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { String cmd="rundll32 url.dll FileProtocolHandler ";//启动相应的windows程序来打开文件 Process p = Runtime.getRuntime().exec(cmd); } catch (Exception e1) { System.out.println(e1); } } }); c.add(b); f.setBounds(100,100,300,300); f.setVisible(true); } public static void main(String arg[]) { new Test(); } } //Rundll32.exe DLLname,Functionname [Arguments] ,DLLname为需要执行的DLL文件名； //Functionname为前边需要执行的DLL文件的具体引出函数；[Arguments]为引出函数的具体参数

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java 关于创建txt文件并下载的实现方法

import java.io.File;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.RandomAccessFile;

public class Io{

public static void main(String [] s){

File filename = new File("F:\\suncity.txt");

String filein="你好！";

RandomAccessFile mm = null;

try {

mm = new RandomAccessFile(filename,"rw");

mm.writeBytes(filein);

} catch (IOException e1) {

// TODO 自动生成 catch 块

e1.printStackTrace();

} finally{

if(mm!=null){

try {

mm.close();

} catch (IOException e2) {

// TODO 自动生成 catch 块

e2.printStackTrace();

}

}

}

}

}

java代码怎样将oracle数据库中数据下载本地，为.txt文件或者.excel文件。

第一个类：

package totabel.action;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JOptionPane;

import topdf.TableToPdf;

import totabel.view.TabelData;

import totabel.xls.ExcelDemo;

public class TableAction implements ActionListener {

TabelData data;

public TableAction(TabelData data) {

this.data = data;

}

public void actionPerformed(ActionEvent e) {

String str = e.getActionCommand();

if ("添加".equals(str)) {

data.addData();

} else if ("导出到Excel".equals(str)) {

ExcelDemo demo = new ExcelDemo();

demo.method(data);

} else if ("删除".equals(str)) {

if (data.getRow() != -1) {

data.delRow();

} else {

JOptionPane.showMessageDialog(null, "请选择要删除的行！");

}

}else if("从Excel导入".equals(str)){

data.getXlsInfo();

}else if("从Excel导入到数据库".equals(str)){

data.toDb();

}else if("从table导出到pdf".equals(str)){

TableToPdf pdf=new TableToPdf();

pdf.newPage(data);

}else if("计算学分".equals(str)){

data.getXlsInfoToCredit();

}

}

}

第二个类：数据库连接

package totabel.db;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class JdbcConnection {

private static JdbcConnection con;

public static JdbcConnection getCon() {

if (con == null) {

con = new JdbcConnection();

}

return con;

}

public Connection getConnection() {

Connection connection=null;

try {

Class.forName("oracle.jdbc.OracleDriver");

String url = "jdbc:oracle:thin:@127.0.0.1:1521:oracle";

String user = "scott";

String password = "tiger";

connection = DriverManager.getConnection(url, user,

password);

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}

return connection;

}

// public static void main(String[] args) {

// JdbcConnection connection=new JdbcConnection();

// connection.getConnection("asd", "99");

// }

}

第三个类：主类（入口）

package totabel.db;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class JdbcConnection {

private static JdbcConnection con;

public static JdbcConnection getCon() {

if (con == null) {

con = new JdbcConnection();

}

return con;

}

public Connection getConnection() {

Connection connection=null;

try {

Class.forName("oracle.jdbc.OracleDriver");

String url = "jdbc:oracle:thin:@127.0.0.1:1521:oracle";

String user = "scott";

String password = "tiger";

connection = DriverManager.getConnection(url, user,

password);

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}

return connection;

}

// public static void main(String[] args) {

// JdbcConnection connection=new JdbcConnection();

// connection.getConnection("asd", "99");

// }

}

第四个类：

package totabel.xls;

import java.io.File;

import java.io.IOException;

import java.util.Vector;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import javax.swing.JOptionPane;

import totabel.view.TabelData;

import jxl.Cell;

import jxl.Sheet;

import jxl.Workbook;

import jxl.read.biff.BiffException;

import jxl.write.Label;

import jxl.write.WritableSheet;

import jxl.write.WritableWorkbook;

import jxl.write.WriteException;

import jxl.write.biff.RowsExceededException;

public class ExcelDemo {

/**

*

* @param args

*/

private Vector title = new Vector();

private Vector[] array;

// public static void main(String[] args) {

// ExcelDemo demo = new ExcelDemo();

// demo.getXlsInfo();

//

// }

public void method(TabelData table) {

int row = table.getRowSize();

int column = table.getColumnSize();

WritableWorkbook book = null;

Vector title = table.setTitle();

Object[] str = title.toArray();

try {

book = Workbook.createWorkbook(new File("test.xls"));

WritableSheet sheet = book.createSheet("成绩表", 0);

for (int i = 0; i str.length; i++) {

sheet.addCell(new Label(i, 0, (String) str[i]));

}

for (int i = 1; i row + 1; i++) {

for (int j = 1; j column + 1; j++) {

sheet.addCell(new Label(j - 1, i, table.getTableInfo(i - 1,

j - 1)));

}

}

book.write();

JOptionPane.showMessageDialog(null, "导出完成！");

} catch (IOException e) {

e.printStackTrace();

} catch (RowsExceededException e) {

e.printStackTrace();

} catch (WriteException e) {

e.printStackTrace();

} finally {

try {

book.close();

} catch (WriteException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}

/**

* 输出Excel的数据到表单

*

* @return

*/

public Vector getXlsInfo() {

Vector v = new Vector();

jxl.Workbook rwb = null;

int index = 0;

try {

rwb = jxl.Workbook.getWorkbook(new File("test.xls"));

Sheet[] sheet = rwb.getSheets();

for (int i = 0; i sheet.length; i++) {

int rs = sheet[i].getRows();

array = new Vector[rs - 1];

for (int j = 1; j rs; j++) {

Cell[] cell = sheet[i].getRow(j);

Vector info = new Vector();

for (int k = 0; k cell.length; k++) {

info.add(cell[k].getContents());

}

array[index] = info;

index++;

v.add(info);

}

Cell[] titleCell = sheet[i].getRow(0);

for (int j = 0; j titleCell.length; j++) {

title.add(titleCell[j].getContents());

}

}

} catch (BiffException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

rwb.close();

}

return v;

}

public Vector getXlsInfoToCredit() {

Vector v = new Vector();

jxl.Workbook rwb = null;

try {

rwb = jxl.Workbook.getWorkbook(new File("d:/test/信科0821（南迁）.xls"));

Sheet[] sheet = rwb.getSheets();

for (int i = 0; i sheet.length; i++) {

int rs = sheet[i].getRows();

array = new Vector[rs - 1];

for (int j = 1; j rs; j++) {

Cell[] cell = sheet[i].getRow(j);

Vector info = new Vector();

for (int k = 0; k cell.length; k++) {

// if(){

Pattern p = Pattern.compile("[0-9]{1,}");

Matcher m = p.matcher(cell[k].getContents());

if (m.matches()) {

int score = Integer.valueOf(cell[k].getContents());

float result = getScore(score);

info.add(result);

} else {

info.add(cell[k].getContents());

}

}

v.add(info);

}

Cell[] titleCell = sheet[i].getRow(0);

for (int j = 0; j titleCell.length; j++) {

title.add(titleCell[j].getContents());

}

}

} catch (BiffException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

rwb.close();

}

return v;

}

public float getScore(int n) {

float score = n;

if (n 60) {

score = 0;

return score;

} else {

if (n = 60 n = 63) {

score = (float) 1.0;

} else if (n = 64 n = 67) {

score = (float) 1.3;

} else if (n = 68 n = 71) {

score = (float) 1.7;

} else if (n = 72 n = 75) {

score = (float) 2.0;

} else if (n = 76 n = 79) {

score = (float) 2.3;

} else if (n = 80 n = 83) {

score = (float) 2.7;

} else if (n = 84 n = 87) {

score = (float) 3.0;

} else if (n = 88 n = 91) {

score = (float) 3.3;

} else if (n = 92 n = 95) {

score = (float) 3.7;

} else if (n = 96 n = 100) {

score = (float) 4.0;

}

return score;

}

}

public Vector getTitle() {

// getXlsInfo();

return title;

}

public Vector[] getArray() {

getXlsInfo();

return array;

}

}

因为时间问题就没有再写了，上面是我以前做的，不懂就q我

求java程序代码、要求输出一个txt文本、逐字输出、中间有sleep效果、谢谢拉~~~~~

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStreamReader;

public class 逐字输入 {

public static void main(String[] args) throws IOException, InterruptedException{

InputStreamReader in=new InputStreamReader(new FileInputStream("d:/1.txt"));

int b;

while((b=in.read())!=-1){

System.out.print((char)b);

Thread.sleep(100);

}

}

}

java /Web 工程 SSH中 数据下载到本地txt文件

可以通过“FileOutputStream”创建文件实例，之后过“OutputStreamWriter”流的形式进行存储，举例：

OutputStreamWriter pw = null;//定义一个流

pw = new OutputStreamWriter(new FileOutputStream(“D:/test.txt”),"GBK");//确认流的输出文件和编码格式，此过程创建了“test.txt”实例

pw.write("我是要写入到记事本文件的数据");//将要写入文件的内容，可以多次write

pw.close();//关闭流

备注：文件流用完之后必须及时通过close方法关闭，否则会一直处于打开状态，直至程序停止，增加系统负担。

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