import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.PrintWriter;
public class readCurve { public static void readFolderByFile(String filePath,String writeFile)
{
File file = new File(filePath);
File[] tempFile = file.listFiles();
for(int i = 0;i<tempFile.length;i++)
{
if(tempFile[i].isFile())
{
System.out.println("File : "+filePath+tempFile[i].getName());
FileReader fr= new FileReader(filePath+tempFile[i].getName());
BufferedReader br = new BufferedReader(fr);
FileWriter fw = new FileWriter(writeFile);
PrintWriter outprint = new PrintWriter(fw);
String record = new String();
while ((record = br.readLine())!= null)
{
if(record.length()>40)
outprint.print(record+"\r\n");
}
br.close();
fr.close();
outprint.close();
fw.close();
}
if(tempFile[i].isDirectory())
{
System.out.println("Directory : "+tempFile[i].getName());
}
}
}
public static void main(String[] args) {
readFolderByFile("d:\\curves\\","d:\\writeFile.txt");
}}上述代码主要是为了读写d:\\curves\\下的文件,并把文件中一行长度大于40的一行写入到另一文件中,可是总
出现错误提示:错误在哪儿?文件肯定是有的. Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Unhandled exception type FileNotFoundException
Unhandled exception type IOException
Unhandled exception type IOException
Unhandled exception type IOException
Unhandled exception type IOException
Unhandled exception type IOException at readCurve.readFolderByFile(readCurve.java:19)
at readCurve.main(readCurve.java:44)
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.PrintWriter;
public class readCurve { public static void readFolderByFile(String filePath,String writeFile)
{
File file = new File(filePath);
File[] tempFile = file.listFiles();
for(int i = 0;i<tempFile.length;i++)
{
if(tempFile[i].isFile())
{
System.out.println("File : "+filePath+tempFile[i].getName());
FileReader fr= new FileReader(filePath+tempFile[i].getName());
BufferedReader br = new BufferedReader(fr);
FileWriter fw = new FileWriter(writeFile);
PrintWriter outprint = new PrintWriter(fw);
String record = new String();
while ((record = br.readLine())!= null)
{
if(record.length()>40)
outprint.print(record+"\r\n");
}
br.close();
fr.close();
outprint.close();
fw.close();
}
if(tempFile[i].isDirectory())
{
System.out.println("Directory : "+tempFile[i].getName());
}
}
}
public static void main(String[] args) {
readFolderByFile("d:\\curves\\","d:\\writeFile.txt");
}}上述代码主要是为了读写d:\\curves\\下的文件,并把文件中一行长度大于40的一行写入到另一文件中,可是总
出现错误提示:错误在哪儿?文件肯定是有的. Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Unhandled exception type FileNotFoundException
Unhandled exception type IOException
Unhandled exception type IOException
Unhandled exception type IOException
Unhandled exception type IOException
Unhandled exception type IOException at readCurve.readFolderByFile(readCurve.java:19)
at readCurve.main(readCurve.java:44)
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.PrintWriter;public class readCurve
{
public static void readFolderByFile(String filePath, String writeFile) throws Exception
{
File file = new File(filePath);
File[] tempFile = file.listFiles();
for (int i = 0; i < tempFile.length; i++)
{
if (tempFile[i].isFile())
{
System.out.println("File : " + filePath + tempFile[i].getName());
FileReader fr = new FileReader(filePath + tempFile[i].getName());
BufferedReader br = new BufferedReader(fr);
FileWriter fw = new FileWriter(writeFile);
PrintWriter outprint = new PrintWriter(fw);
String record = new String();
while ((record = br.readLine()) != null)
{
if (record.length() > 40)
outprint.print(record + "\r\n");
}
br.close();
fr.close();
outprint.close();
fw.close();
}
if (tempFile[i].isDirectory())
{
System.out.println("Directory : " + tempFile[i].getName());
}
}
}
public static void main(String[] args) throws Exception
{
readFolderByFile("d:\\curves\\", "d:\\curves\\writeFile.txt");
}
}
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.PrintWriter;
public class readCurve {
//IO包需要捕捉异常
public static void readFolderByFile(String filePath,String writeFile)throws Exception //抛出异常
{
try{
File file = new File(filePath);
File[] tempFile = file.listFiles();
for(int i = 0;i <tempFile.length;i++)
{
if(tempFile[i].isFile())
{
System.out.println("File : "+filePath+tempFile[i].getName());
FileReader fr= new FileReader(filePath+tempFile[i].getName());
BufferedReader br = new BufferedReader(fr);
FileWriter fw = new FileWriter(writeFile);
PrintWriter outprint = new PrintWriter(fw);
String record = new String();
while ((record = br.readLine())!= null)
{
if(record.length()>40)
outprint.print(record+"\r\n");
} catch(Exception ex){
ex.printStackTrace();//打印异常信息
}finally{//关闭流
if(br!=null){
br.close();
}
if(fr!=null){
fr.close();
}
if(outprint!=null){
outprint.close();
}
if(fw!=null){
fw.close();
}
} }
if(tempFile[i].isDirectory())
{
System.out.println("Directory : "+tempFile[i].getName());
}
}
}
public static void main(String[] args) {
readFolderByFile("d:\\curves\\","d:\\writeFile.txt");
} }
楼主还是用eclipse开发吧。 这样效率高很多的。不用关心编译错误了,她会提示的:)