java 系统找不到指定的文件，小弟不知错在哪里，请指教，谢谢！

[mauricehawk]

package com.dao;

import java.io.*;

public class GoonieResult {
public static void readFileByChars(String fileName){
File file = new File(fileName);
System.out.println(fileName+"=====");
Reader reader = null;
try{
System.out.println("By chars");
char[] tempchars = new char[30];
int charread = 0;
reader = new InputStreamReader(new FileInputStream(fileName));
while((charread = reader.read(tempchars))!=-1){
if((charread == tempchars.length)&&(tempchars[tempchars.length -1]!='\r')){
System.out.print(tempchars);
}else{
for(int i=0; i<charread; i++){
if(tempchars[i] == '\r'){
continue;
}else{
System.out.print(tempchars[i]);
}
}
}
}
}catch(Exception e1){
e1.printStackTrace();
}finally{
if(reader != null){
try{
reader.close();
}catch(IOException e){

}
}
}
}

public static void main(String args[]){
String fileName = "D:\\test.txt";
GoonieResult.readFileByChars(fileName);
}
}

D:\test.txt=====
By chars
java.io.FileNotFoundException: D:\test.txt (系统找不到指定的文件。)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at com.dao.GoonieResult.readFileByChars(GoonieResult.java:14)
at com.dao.GoonieResult.main(GoonieResult.java:43)

[ouyangxiaokang6]

[Quote=引用 5 楼 chenchuanfeng001 的回复:]
如果你电脑设置是隐藏已知扩展名，那么事实上文件名可能是test.txt.txt
改为String fileName = "D:\\test.txt.txt";
或者文件重命名为test.
[/Quote]
up,应该就是你的文件不存在，好好查查

[Allen114]

应该是隐藏了扩展名

[snowfox3761]

File file = new File(fileName);
我注意到了这行，你是不是要生成这个文件后直接读取？
你在这行下面执行下file.getPAth或者getName之类的方法，打印出来看看。
怀疑文件生成的不对。

[狂浪吻血]

File file = new File(fileName);
执行下file.getPAth或者getName之类的方法，打印出来看看。

[createWang]

package com.dao;

import java.io.*;

public class GoonieResult {
    public static void readFileByChars(String fileName) {
        File file = new File(fileName);
        System.out.println(fileName + "=====");
        Reader reader = null;
        try {
            System.out.println("By chars");
            char[] tempchars = new char[30];
            int charread = 0;
            reader = new InputStreamReader(new FileInputStream(fileName));
            while ((charread = reader.read(tempchars)) != -1) {
                if ((charread == tempchars.length) &&
                    (tempchars[tempchars.length - 1] != '\r')) {
                    System.out.print(tempchars);
                } else {
                    for (int i = 0; i < charread; i++) {
                        if (tempchars[i] == '\r') {
                            continue;
                        } else {
                            System.out.print(tempchars[i]);
                        }
                    }
                }
            }
        } catch (Exception e1) {
            e1.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {

                }
            }
        }
    }

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

       1.确定机器上是否真的存在此文本文件
        2.机器配置的后缀名是不是被隐藏了
       
       */
        String fileName = "D:\\test.txt";
        GoonieResult.readFileByChars(fileName);
    }
}

[chxy148]

原因可能是其中之一：
a.此文件不存在
b.扩展名被隐藏了

[chenwei023]

确定文件名写对没？

[Daniel_Cao_]

系统里没有D:\test.txt 文件

[日上三千]

既然是FileInputStream说找不到你的文件，那是真的没有这个文件。你本机上真的有d:\test.txt这个文件吗？

[chenchuanfeng001]

如果你电脑设置是隐藏已知扩展名，那么事实上文件名可能是test.txt.txt
改为String fileName = "D:\\test.txt.txt";
或者文件重命名为test.

[zhoushijin5201314]

d:\test.txt
这个文件不存在吧
看看是不是文件名写错了啊

[gzfdxy]

package com.dao;

import java.io.*;

public class GoonieResult {
public static void readFileByChars(String fileName) {
File file = new File(fileName);
System.out.println(fileName + "=====");
Reader reader = null;
try {
System.out.println("By chars");
char[] tempchars = new char[30];
int charread = 0;
reader = new InputStreamReader(new FileInputStream(fileName));
while ((charread = reader.read(tempchars)) != -1) {
if ((charread == tempchars.length) &&
(tempchars[tempchars.length - 1] != '\r')) {
System.out.print(tempchars);
} else {
for (int i = 0; i < charread; i++) {
if (tempchars[i] == '\r') {
continue;
} else {
System.out.print(tempchars[i]);
}
}
}
}
} catch (Exception e1) {
e1.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {

}
}
}
}

public static void main(String args[]) {
String fileName = "D:\\test.txt";
GoonieResult.readFileByChars(fileName);
}
}

[starscc]

检查下文件是否存在，或者你隐藏了扩展文件名......

[lzbang]

D:\test.txt 文件指示方式错了


正确方式 D:/test.txt

[lzbang]

在java中，文件路径要用 "/"，而不能使用"\"的，否则报错

[huadis]

这么一个问题热度很高呀

[a3070]

d:\\test.txt

[lzbang]

经调试，已经ok了
*1、 D:\test.txt 文件指示方式错了 ，正确方式 D:/test.txt

*2、该文件要存在，如果不存在，会抛出异常

import java.io.*; 

public class GoonieResult { 
public static void readFileByChars(String fileName){ 
File file = new File(fileName); 
System.out.println(fileName+"====="); 
Reader reader = null; 
try{ 
System.out.println("By chars"); 
char[] tempchars = new char[30]; 
int charread = 0; 
reader = new InputStreamReader(new FileInputStream(fileName)); 
while((charread = reader.read(tempchars))!=-1){ 
if((charread == tempchars.length)&&(tempchars[tempchars.length -1]!='\r')){ 
System.out.print(tempchars); 
}else{ 
for(int i=0; i <charread; i++){ 
if(tempchars[i] == '\r'){ 
continue; 
}else{ 
System.out.print(tempchars[i]); 
} 
} 
} 
} 
}catch(Exception e1){ 
e1.printStackTrace(); 
}finally{ 
if(reader != null){ 
try{ 
reader.close(); 
}catch(IOException e){ 

} 
} 
} 
} 

public static void main(String args[]){ 
String fileName = "D:/test.txt"; 
GoonieResult.readFileByChars(fileName); 
} 
}