Java文件和byte数组转换

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public class T3 {

    public static void main(String[] args){
        String filePath = "E:\\softoon\\workspace_softoon\\TestMobile\\src\\1.docx";
        String outFilePath = "E:\\softoon\\workspace_softoon\\TestMobile\\src";
        String outFileName = "2.docx";

        getFile(getBytes(filePath),outFilePath,outFileName);
    }

    /**
     * 获得指定文件的byte数组
     */
    public static byte[] getBytes(String filePath){
        byte[] buffer = null;
        try {
            File file = new File(filePath);
            FileInputStream fis = new FileInputStream(file);
            ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
            byte[] b = new byte[1000];
            int n;
            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }
            fis.close();
            bos.close();
            buffer = bos.toByteArray();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return buffer;
    }

    /**
     * 根据byte数组，生成文件
     */
    public static void getFile(byte[] bfile, String filePath,String fileName) {
        BufferedOutputStream bos = null;
        FileOutputStream fos = null;
        File file = null;
        try {
            File dir = new File(filePath);
            if(!dir.exists()&&dir.isDirectory()){//判断文件目录是否存在
                dir.mkdirs();
            }
            file = new File(filePath+"\\"+fileName);
            fos = new FileOutputStream(file);
            bos = new BufferedOutputStream(fos);
            bos.write(bfile);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }
}

 转自：http://forai.iteye.com/blog/1221081

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Java IO文件操作

Java代码  

//读文件 BufferedReader
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(new File("fileUrl"))));
String tempStr = "";
while((tempStr = br.readLine())!=null){
    System.out.println(tempStr);
}
//写文件 PrintWriter
PrintWriter pw = new PrintWriter(new File("fileUrl"));
pw.println("每一次输出一行到文件");
//写文件 BufferedWriter
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File("fileUrl"))));
bw.write("");

//一次读取文件所有内容
File file = new File("filePath");
Long l = file.length();
byte[] fc = new byte[l.intValue()];
FileInputStream fis = new FileInputStream(file);
fis.read(fc);
fis.close();
String str = new String(fc,"UTF-8");