java讀取寫入文件

先來看一下java寫入文件

 

public static void readTxt(String value) throws IOException {
        FileWriter fw = null;
        try {
            // 如果文件存在，則追加內容；如果文件不存在，則創建文件
            File f = new File("E:\\dd.txt");
            fw = new FileWriter(f, true);
        } catch (IOException e) {
            e.printStackTrace();
        }
        PrintWriter pw = new PrintWriter(fw);
        pw.println(new String(value.getBytes(), "utf-8"));
        pw.flush();
        try {
            fw.flush();
            pw.close();
            fw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

 

下面是java來讀取文件

    public static String readText() throws IOException {
        String pathname = "E:\\dd.txt"; // 絕對路徑或相對路徑都可以，這里是絕對路徑，寫入文件時演示相對路徑
        String fileContent = "";
        File f = new File(pathname);
        if (f.isFile() && f.exists()) {
            InputStreamReader read = new InputStreamReader(new FileInputStream(f), "UTF-8");
            BufferedReader reader = new BufferedReader(read);
            String line;
            while ((line = reader.readLine()) != null) {
                fileContent += line;
            }
            read.close();
        }
        return fileContent;
    }

文件流基礎，以方便查閱！！！