将字符串按照utf-8或gb2312编码写入文件，10个字节一行，当字符超过10个字节则放到下一行。

原创于 2016-04-28 15:50:12 发布 · 1.1k 阅读

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本文提供了一个使用Java进行文件分段读取和写入的示例代码。通过BufferedReader和BufferedWriter实现对大文件的有效处理，将源文件按照行分段复制到新文件中，每行分为5个字符一组，并在每组后添加换行符。

public static void main(String[] args) {
try {
File in = new File("d:/FileTest.txt");

File out = new File("d:/FileTest2.txt");
FileReader fr = new FileReader(in);
FileWriter fw = new FileWriter(out);
// InputStreamReader isr = new InputStreamReader(new FileInputStream(in));
// OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(out));
BufferedReader br = new BufferedReader(fr);
BufferedWriter bw = new BufferedWriter(fw);

// System.out.println("in-encoding:" + isr.getEncoding());
// System.out.println("out-encoding:" + osw.getEncoding());
// System.out.println(in.length());

int c;
long line;
if(in.length() % 10 == 0) {
line = in.length()/10;
} else {
line = in.length()/10 + 1;
}

// System.out.println(line);

for (int j = 0; j < line; j++) {
for (int i = 0; i < 5 && (c=br.read()) != -1; i++) {
bw.write(c);
}
bw.newLine();
}

br.close();
bw.close();
} catch (Exception e) {
e.printStackTrace();
}

}