java导入文本文件代码 java怎么导入文本

JAVA编程怎样将文本文档导入

新建文本文档之后，在里面写程序，保存之后要把后缀名改成.java文件，文件的名字是类名。

然后在命令提示符里面使用javac 命令编译，使用java运行。

相关问答

Q1: 用java代码把txt文档中资料导入到数据库

BufferedReader input;

try {

String s = new String();

input = new BufferedReader(new FileReader("f:\\123.txt"));

while ((s = input.readLine()) != null) { // 判断是否读到java导入文本文件代码了最后一行

String info[] = s.split(" ");

System.out.println( info[0] + " " + info[1] + " " + info[2] );

}

input.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

把info[0] + " " + info[1] + " " + info[2] 这三个值放在insert语句里就行java导入文本文件代码了 经过测试

Q2: java读取文本文件代码

java读取文本文件java导入文本文件代码的方法有很多 这个例子主要介绍最简单 最常用java导入文本文件代码的BufferedReader类 完整例子如下 package net chinaunix blog hzm text;import java io BufferedReader;import java io FileReader;import java io IOException;public class ReadFile {private String path;public ReadFile（String filePath）{path = filePath;}public String[] openFile（） throws IOException{FileReader fr = new FileReader（path） BufferedReader textReader = new BufferedReader（fr） String[] textData = new String[readLines（）];int i;for（i= ; i readLines（） i++）{textData[i] = textReader readLine（） }textReader close（） return textData;}int readLines（） throws IOException{FileReader fileToRead = new FileReader（path） BufferedReader bf = new BufferedReader（fileToRead） int numberOfLines = ;@SuppressWarnings（ unused ）String oneLine;while（（oneLine = bf readLine（）） != null）{numberOfLines++;}bf close（） return numberOfLines;}}package net chinaunix blog hzm text;import java io IOException;public class FileData {public static void main（String[] args） throws IOException{String filePath = C:/text txt ;try{ReadFile reader = new ReadFile（filePath） String[] content = reader openFile（） int i;for（i= ;icontent length;i++）{System out println（content[i]） }}catch（IOException e）{System out println（ 异常信息 + e getMessage（）） }}}java io BufferedReaderThe buffer size may be specified or the default size may be used The default is large enough for most purposes In general each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream It is therefore advisable to wrap a BufferedReader around any Reader whose read（） operations may be costly such as FileReaders and InputStreamReaders For example BufferedReader in = new BufferedReader（new FileReader（ foo in ）） will buffer the input from the specified file Without buffering each invocation of read（） or readLine（） could cause bytes to be read from the file converted into characters and then returned which can be very inefficient Programs that use DataInputStreams for textual input can be localized by replacing each DataInputStream with an appropriate BufferedReader java io FileReaderFileReader is meant for reading streams of characters For reading streams of raw bytes consider using a FileInputStream lishixinzhi/Article/program/Java/hx/201311/26249

Q3: 用java导入txt数据到sql server中

这个很简单啊java导入文本文件代码，

通过文件流一行一行java导入文本文件代码的读

每行java导入文本文件代码的字符串通过replaceAll空格（可能是\t）替换成特殊字符java导入文本文件代码，注意java导入文本文件代码：要用正则替换连续的空格（或\t）

然后通过split这个特殊字符成数组

数组转成表映射对象

批量插入数据库

Q4: 用java如何将txt文件导入mysql

Java中将txt文件导入到mysql基本的思路就是先使用I/O操作流获取到文件具体信息，然后将信息拼接成mysql插入到数据库中，示例如下：

1、先读取txt文件的内容，文件内容可以按照一定的规律进行排列，这样程序读取就方便。

import java.io.IOException;

import java.io.RandomAccessFile;

import java.io.UnsupportedEncodingException;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import com.config.Constants;

import com.utils.UUIDUtil;

/**

* txt文本数据 采集类

*

* @see

*/

public class UserDataGather {

public static final String TXT_FILE_PATH = "D://testUser.txt";

public static final String openFileStyle = "r";

public static final String fieldLimitChar = ".";

public static final int fieldAllCount = 1;

public static final String default_password = "PTMD0309";

public Integer count = 0;

private String FltNum;

public String UUID;

/**

* 功能：解析文本文件

*/

public void loadFile() {

try {

RandomAccessFile raf = new RandomAccessFile(TXT_FILE_PATH, openFileStyle);

String line_record = raf.readLine();

while (line_record != null) {

// 解析每一条记录

parseRecord(line_record);

line_record = raf.readLine();

}

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 功能：具体解析每一条记录，这里可以增加很多对记录的解析判断条件，如是否为字母、

*/

@SuppressWarnings("static-access")

private void parseRecord(String line_record) throws Exception {

//拆分记录

// String[] fields = line_record.split(fieldLimitChar);

// System.out.println(tranStr(line_record)+"Ok");

String temp = line_record.substring(line_record.indexOf(fieldLimitChar, 0), line_record.indexOf(" ", line_record.indexOf(fieldLimitChar, 0)));

// if (fields.length == fieldAllCount) {

//

FltNum = tranStr(temp).trim().replace(fieldLimitChar,"").replace(" ","");

// System.out.println(FltNum);

if(FltNum.length()=4){

if(!isNumeric(FltNum)){

// System.out.println(generateSql(FltNum)[0].toString());

// System.out.println(generateSql(FltNum)[1].toString());

count++;

String[] temp1 = generateSql(FltNum);

MyFile mf = new MyFile();

mf.creatTxtFile("insertPinTuUserSql");

mf.writeTxtFile(temp1[0].toString());

mf.creatTxtFile("UUID");

mf.writeTxtFile(temp1[1].toString()+",");

}

}else if(FltNum.length() ==2 || FltNum.length() ==3){

if(!isNumeric(FltNum)){

if(!isTwoCharacter(FltNum)){

// System.out.println(generateSql(FltNum)[0].toString());

// System.out.println(generateSql(FltNum)[1].toString());

count++;

String[] temp2 = generateSql(FltNum);

MyFile mf = new MyFile();

mf.creatTxtFile("insertPinTuUserSql");

mf.writeTxtFile(temp2[0].toString());

mf.creatTxtFile("UUID");

mf.writeTxtFile(temp2[1].toString()+",");

}

}

}

// InsertDB db = new InsertDB();

//

// db.insertDB(FltNum);

// }

}

@SuppressWarnings("static-access")

public String[] generateSql(String userName) throws IOException{

StringBuffer sbf = new StringBuffer();

String[] str = new String[2];

String uuid = UUIDUtil.getUUID();

sbf.append("insert into user values('"+uuid+"','" + userName +"','"+default_password+"',"+Constants.ENABLED+","+Constants.NUllDELETE+","+Constants.AUDITING+",'"+uuid+"@164.com','"+formatDateTime()+"',"+Constants.REGEDIT_USER+");/n");

sbf.append("insert into users values('"+uuid+"',"+ null+","+Constants.MALE+","+null+","+null+",'60.176.36.250','"+formatDateTime()+"',"+null+","+null+","+null+","+null+","+null+","+null+",0,"+null+","+null+",0,0,0,'"+formatDateTime()+"','1036',0,"+null+","+null+","+null+","+null+","+null+",'11',"+null+","+null+","+null+","+null+","+null+");/n");

sbf.append("insert into user_user_group values('"+uuid+"','"+ uuid +"','"+Constants.PERSONAL_USER+"');/n");

UUID = uuid;

str[0]=sbf.toString();

str[1]=UUID;

return str;

}

public String formatDateTime(){

Date date = new Date();

/**

* 时间格式化2009-12-31 09:04:31

*/

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

System.out.println(sdf.format(date));

return sdf.format(date);

}

private String tranStr(String oldstr) {

String newstr = "";

try {

newstr = new String(oldstr.getBytes("ISO-8859-1"), "utf-8");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

return newstr;

}

public static boolean isNumeric(String str){

Pattern pattern = Pattern.compile("[0-9]*");

return pattern.matcher(str).matches();

}

public static boolean isTwoCharacter(String str){

String regEx="[a-zA-Z0-9]{2,3}";

Pattern p=Pattern.compile(regEx);

Matcher m=p.matcher(str);

return m.find();

}

}

2、连接数据库执行数据导入

import java.sql.DriverManager;

import java.sql.ResultSet;

import com.mysql.jdbc.Connection;

import com.mysql.jdbc.Statement;

/**

* 插入数据库 生成sql语句

*

* created on Mar 8, 2010

* @see

*/

public class InsertDB {

private static final String user = "pintu";

private static final String pwd = "pintu";

private static final String url = "jdbc:mysql://192.168.10.6:3306/pintu";

private static final String driver = "com.mysql.jdbc.Driver";

public static Connection getCon() {

Connection con = null;

try {

Class.forName(driver).newInstance();

con = (Connection) DriverManager.getConnection(url, user, pwd);

if (con != null) {

System.out.println("你已连接到数据库：" + con.getCatalog());

}

} catch (Exception e) {

System.out.println("连接数据库失败！");

e.printStackTrace();

}

return con;

}

public boolean insertDB(String FltNum) {

Connection con = null;

Statement stm = null;

boolean flag = false;

String sql = "insert into t_FltPsgInfo values('" + FltNum +

// "','"

// + FltLine + "','" + FltDate + "','" + PsgName + "','" + PsgType

//

// + "','" + PsgSex + "','" + PsgCab + "','" + PsgSeatNo + "','"

//

// + PsgInfo +

"')";

try {

con = getCon();

stm = (Statement) con.createStatement();

int i = stm.executeUpdate(sql);

if (i 0) {

flag = true;

System.out.println(flag + "插入数据成功！");

}

} catch (Exception e) {

flag = false;

e.printStackTrace();

} finally {

close(null, stm, con);

}

return flag;

}

//关闭相关连接

public void close(ResultSet rs, Statement stm, Connection con) {

if (rs != null)

try {

rs.close();

} catch (Exception e) {

e.printStackTrace();

}

if (stm != null)

try {

stm.close();

} catch (Exception e) {

e.printStackTrace();

}

if (con != null)

try {

con.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

Q5: java代码 如何向TXT文件写入内容？

  向txt文件写入内容基本思路就是获得一个file对象java导入文本文件代码，新建一个txt文件java导入文本文件代码，打开I/O操作流，使用写入方法进行读写内容，示例如下java导入文本文件代码：

package common;

import java.io.*;

import java.util.ArrayList;

public class IOTest {

public static void main (String args[]) {

ReadDate();

WriteDate();

}

/**

* 读取数据

*/

public static void ReadDate() {

String url = “e:/2.txt”;

try {

FileReader read = new FileReader(new File(url));

StringBuffer sb = new StringBuffer();

char ch[] = new char[1024];

int d = read.read(ch);

while(d!=-1){

String str = new String(ch,0,d);

sb.append(str);

d = read.read(ch);

}

System.out.print(sb.toString());

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

/**

* 写入数据

*/

public static void WriteDate() {

try{

File file = new File(“D:/abc.txt”);

if (file.exists()) {

file.delete();

}

file.createNewFile();

BufferedWriter output = new BufferedWriter(new FileWriter(file));

ArrayList ResolveList = new ArrayList();

for (int i = 0; i  10; i++) {

ResolveList.add(Math.random()* 100);

}

for (int i=0 ;i 

output.write(String.valueOf(ResolveList.get(i)) + “\n”);

}

output.close();

} catch (Exception ex) {

System.out.println(ex);

}

}

}

原文出自【比特网】，转载请保留原文链接java导入文本文件代码：

关于java导入文本文件代码和java怎么导入文本的介绍到此就结束了，不知道你从中找到你需要的信息了吗 ？如果你还想了解更多这方面的信息，记得收藏关注本站。