自己總結的Java實現檔案的讀寫操作

做個筆記,針對java 的file的操作

 1.根據檔案名稱及字串,寫檔案

public static boolean writeJiang(String content,String path,String name)...{
        try...{
            File file = new File(path);
            System.out.println("檔案的路徑是：" + file+"/"+name);
            BufferedWriter fileout = new BufferedWriter(new FileWriter(file+"/"+name,true));
            fileout.write(content);
            fileout.write(" ");
            fileout.flush();
            fileout.close();
        }
        catch(Exception e)...{
            e.printStackTrace();
        }
        System.out.println("寫檔案完畢");
        return true;
    } 

 

2.讀檔案,返回字串

public static String readTxt(String path)...{
        String array = "";
        
        try...{
            //讀取文字檔
            File file = new File(path);        
            FileInputStream rdf = new FileInputStream(file);
            byte[] s = new byte[rdf.available()];
            int b = rdf.available();
            while((b=rdf.read(s, 0, b))!=-1)...{
                String content = new String(s,0,b);
                array = array+content;
            }
            rdf.close();
        }
        catch(Exception e)...{
            e.printStackTrace();
        }
        return array;
    } 

 

3.刪除檔案中某一行.ID是行號,path+name=File

 

public static int deleteTxt(String path,String name,int id)...{
        int result = 0;
        String content = "";
        try...{
            //讀取檔案
            content = readTxt(path + "/" + name);
            System.out.println(path + "/" + name);
            
            System.out.println("未刪除記錄之前得是：" +  content);
            
            //刪除某一行
            String[] a = content.split(" ");
            StringBuffer d = new StringBuffer();
            for (int j = 0; j < a.length; j++) ...{
                if (j != id)
                    d.append(a[j]).append(" ");
            }
            System.out.println("刪除記錄之後的為：" + d.toString());
            
            //將修改後的寫入檔案
            writeNewTxt(d.toString(),path,name);
            
            result = 1;
        }
        catch(Exception e)...{
            e.printStackTrace();
        }
        return result;
    }