Question

如何按顺序读取文件？

public static void main(String[] args){
    String fichier ="E:\\fichiers\\test.txt";

    int tab[] = {2, 2, 20, 8, 20, 8, 4, 3, 7, 3, 3, 3, 18, 139};
    String tabS[] = new String[14];


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

        char cbuf[] = new char[tab[i]];

        try {

            InputStream       ips  = new FileInputStream(fichier); 
            InputStreamReader ipsr = new InputStreamReader(ips);
            BufferedReader    br   = new BufferedReader(ipsr);

            br.read(cbuf, 0, tab[i]);

            tabS[i] = new String(cbuf);
            System.out.println(tabS[i]);

        } catch (Exception e){
            System.out.println(e.toString());
        }
    }
}

我的文件内容只有这一行：

BOUUUUUUUUUUUUUUUUUUUUUU!

当我运行 readMe 方法时，我得到了这个：

BO
BO
BOUUUUUUUUUUUUUUUUUU
BOUUUUUU
BOUUUUUUUUUUUUUUUUUU
BOUUUUUU
BOUU
BOU
BOUUUUU
BOU
BOU
BOU
BOUUUUUUUUUUUUUUUU
BOUUUUUUUUUUUUUUUUUUUUUU!

这里的问题是，每当他开始阅读文件时，它就开始位于0。

请帮忙吗？

Answer 1

在我看来，你需要在创建流之后在try / catch中移动for循环。

public static void main(String[] args){
    String fichier ="E:\\fichiers\\test.txt";

    int tab[] = {2, 2, 20, 8, 20, 8, 4, 3, 7, 3, 3, 3, 18, 139};
    String tabS[] = new String[14];

    try {

        InputStream       ips  = new FileInputStream(fichier); 
        InputStreamReader ipsr = new InputStreamReader(ips);
        BufferedReader    br   = new BufferedReader(ipsr);

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

            char cbuf[] = new char[tab[i]];

            br.read(cbuf, 0, tab[i]);

            tabS[i] = new String(cbuf);
            System.out.println(tabS[i]);
        }

    } catch (Exception e){
        System.out.println(e.toString());
    }
}

Answer 2

看你有：

int tab[] = {2, 2, 20, 8, 20, 8, 4, 3, 7, 3, 3, 3, 18, 139};

您的输出是：

BO                        // length 2
BO                        // length 2
BOUUUUUUUUUUUUUUUUUU      // length 20
BOUUUUUU                  // length 8
BOUUUUUUUUUUUUUUUUUU
BOUUUUUU
BOUU
BOU
BOUUUUU
BOU
BOU
BOU
BOUUUUUUUUUUUUUUUU
BOUUUUUUUUUUUUUUUUUUUUUU!

这是有道理的：

        br.read(cbuf, 0, tab[i]);
        tabS[i] = new String(cbuf);
        System.out.println(tabS[i]);

它在每次迭代中从第0位开始，因为你有：

        InputStream       ips  = new FileInputStream(fichier); 
        InputStreamReader ipsr = new InputStreamReader(ips);
        BufferedReader    br   = new BufferedReader(ipsr);

在for循环内。只需将其从循环中删除即可解决问题：

try 
{
        InputStream       ips  = new FileInputStream(fichier); 
        InputStreamReader ipsr = new InputStreamReader(ips);
        BufferedReader    br   = new BufferedReader(ipsr);

        for(int i=0; i<tab.length; i++)
        {
            char cbuf[] = new char[tab[i]];
            br.read(cbuf, 0, tab[i]);
            tabS[i] = new String(cbuf);

            System.out.println(tabS[i]);
        } 

}
catch (Exception e)
{
    System.out.println(e.toString());
}

如何更改此main方法以按顺序读取文件

2 个答案: