java通过正砸表达式修改某个文件内容

痛定思痛。 2022-12-25 11:55 216阅读 0赞

package com.supcon;
    
    import java.io.*;
    
    /**
     * @author: zhaoxu
     * @description:
     */
    public class test { 
        public static void main(String[] args) throws IOException { 
            StringBuffer fileString = readFile(args[0]);
            String newString = fileString.toString().replaceAll(args[1], args[2]);
            writeToFile(args[0],newString);
        }
    
        /**
         * 按行读取全部文件数据
         *
         * @param strFile
         */
        public static StringBuffer readFile(String strFile) throws IOException { 
            StringBuffer strSb = new StringBuffer();
            InputStreamReader inStrR = new InputStreamReader(new FileInputStream(strFile), "UTF-8");
            // character streams
            BufferedReader br = new BufferedReader(inStrR);
            String line = br.readLine();
            while (line != null) { 
                strSb.append(line).append("\r\n");
                line = br.readLine();
            }
            return strSb;
        }a
    
        /**
         * 写入文件
         * @param fileName
         * @param s
         * @throws IOException
         */
        public static void writeToFile(String fileName,String s) throws IOException { 
            File f1 = new File(fileName);
            OutputStream out = null;
            BufferedWriter bw = null;
            if (f1.exists()) { 
                out = new FileOutputStream(f1);
                bw = new BufferedWriter(new OutputStreamWriter(out, "utf-8"));
                bw.write(s);
                bw.flush();
                bw.close();
            } else { 
                System.out.println("文件不存在");
            }
        }
    }