package zc
import java.io.BufferedReader
import java.io.File
import java.io.FileNotFoundException
import java.io.FileReader
import java.io.IOException
public class readLine {
public static void main(String[] args) {
// TODO Auto-generated method stub
File file = new File("C:/zc.txt")
BufferedReader reader = null
String tempString = null
int line =1
try {
System.out.println("以行为单位读取文件内容，一次读一整行：")
reader = new BufferedReader(new FileReader(file))
while ((tempString = reader.readLine()) != null) {
System.out.println("Line"+ line + ":" +tempString)
line ++
}
reader.close()
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace()
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}finally{
if(reader != null){
try {
reader.close()
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}
}
}
}
}
2).按字节读取TXT文件
package zc
import java.io.File
import java.io.FileInputStream
import java.io.FileNotFoundException
import java.io.IOException
import java.io.InputStream
public class readerFileByChars {
public static void main(String[] args) {
// TODO Auto-generated method stub
File file = new File("c:/zc.txt")
InputStream in = null
byte[] tempByte = new byte[1024]
int byteread = 0
try {
System.out.println("以字节为单位读取文件内容，一次读多个字节：")
in = new FileInputStream(file)
while ((byteread = in.read(tempByte)) != -1 ) {
System.out.write(tempByte, 0, byteread)
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace()
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}finally{
if (in != null) {
try {
in.close()
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}
}
}
}
}
import java.io.BufferedInputStreamimport java.io.BufferedReaderimport java.io.Fileimport java.io.FileInputStreamimport java.io.InputStreamReaderimport java.io.Readerpublic class H {/** * 功能：Java读取txt文件的内容 * 步骤：1：先获得文件句柄 * 2：获得文件句柄当做是输入一个字节码流，需要对这个输入流进行读取 * 3：读取到输入流后，需要读取生成字节流 * 4：一行一行的输出。readline()。 * 备注：需要考虑的是异常情况 * @param filePath */public static void readTxtFile(String filePath){try {String encoding="GBK" File file=new File(filePath) if(file.isFile() &&file.exists()){ //判断文件是否存在InputStreamReader read = new InputStreamReader(new FileInputStream(file),encoding)//考虑到编码格式BufferedReader bufferedReader = new BufferedReader(read) String lineTxt = null while((lineTxt = bufferedReader.readLine()) != null){System.out.println(lineTxt) }read.close() }else{System.out.println("找不到指定的文件") }} catch (Exception e) {System.out.println("读取文件内容出错") e.printStackTrace() } } public static void main(String argv[]){String filePath = "L:\\20121012.txt"// "res/" readTxtFile(filePath) } }
