简易手机店管理程序源码

import java.util.*; import java.io.*; public class FileEdit { // 输出所有信息 public final static Object[] outputAll() { Object[] dataArray = null; try { ObjectInputStream in = new ObjectInputStream(new FileInputStream( "data.dat")); try { dataArray = (Object[]) in.readObject(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } in.close(); } catch (Exception e) { } return dataArray; } // 判断是否存在此用户 public final static boolean isUser(Object[] in, Object[] data) { boolean flag = false; if ((data != null) && (in != null)) { for (int i = 0; i < in.length; i += 2) { System.out.println("判断中in[" + i + "]" + in[i]); // if 代码相同 if ((in[i].equals(data[0])) && (in[i + 1].equals(data[1]))) { flag = true; break; } } } return flag; } // 假如文件内已有本信息，更新文件数据 public final static Object[] update(Object[] in, Object[] data) { Object[] array = null; int index = 0; int n = 4; for (int i = 0; i < in.length; i++) { System.out.println("in[" + i + "]" + in[i]); // if 代码相同 if (in[i].equals(data[1])) { index = i - 1; System.out.println("更新index=" + index); } } for (int j = 0; j < n; j++) { System.out.println("更新中的index=" + index); in[index + j] = data[j]; System.out.println("更新中的index + j=" + (index + j)); } array = in; return array; } // 判断是否已含有本信息，这个方法的作用是将文件中的相关信息返回,m表示要比较的是data数组中第m个元素 public final static Object[] isAlreadyHas(Object[] in, Object[] data, int m) { Object[] a = null; // MsgLong代表每次存入时的信息数是多少，即存入的数组长度 int MsgLong = data.length; System.out.println("MsgLong=" + MsgLong); System.out.println("查找时调用的m为" + m); if (in == null) { System.out.println("in == null"); } // 这里根据index判断搜索到的信息会有多长，建一个数组a准备储存每一项符合条件的信息 int index = 0; if ((data != null) && (in != null)) { // 用index先进行一次比较以确定该设置多大的数组来存数据 for (int i = m; i < in.length; i += MsgLong) { // 转为String是为了可以使用去空格的trim()方法 if (in[i].toString().trim().equalsIgnoreCase( data[m].toString().trim())) { index++; System.out.println("index=" + index); } } a = new Object[index * 4]; } else { } System.out.println("index=" + index); if (index != 0) { System.out.println("a.length=" + a.length); } int n = 0; // 上面定义了一个n，指示当前已将数组存到哪一位 if ((data != null) && (in != null)) { /* * 每次只比较data(长度为MsgLong)数组中的第m位 i第一次为m,后面每次递加MsgLong个单位，用来指示文件所读出的数组 */ for (int i = m; i < in.length; i += MsgLong) { // //////当某位相同时 if (in[i].toString().trim().equalsIgnoreCase( data[m].toString().trim())) { System.out .println("in[i].toString().trim().equalsIgnoreCase(data[m].toString())" + "\n" + "in[i].toString=" + in[i].toString() + "data[m].toString=" + data[m].toString()); System.out.println("找到"); int b = i + (MsgLong - m);// b指示in数组某个单元的末位元素 // /j为该单元首位元素序号 for (int j = i - m; j < b; j++) { a[n] = in[j]; System.out.println("n=" + n + ",j=" + j); System.out.println(a[n]); n++; // 每存入数组中一位，把充当指针的n往后移 } } } } if (a == null) { System.out.println("a==null"); } return a; } // 将主数据数组写入文件 public final static void output(Object[] dataArray, File f) { try { ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream(f)); out.writeObject(dataArray); out.close(); } catch (Exception e) { } } // 从文件中读取数据到数组中 public final static Object[] DataInput(File f) throws ClassNotFoundException { Object[] dataArray = null; try { ObjectInputStream in = new ObjectInputStream(new FileInputStream(f)); dataArray = (Object[]) in.readObject(); in.close(); } catch (Exception e) { return null; } return dataArray; } // 添加一条记录到数组中 public final static Object[] add(Object[] in, Object[] data) { Object[] array = null; if (in != null) { array = new Object[in.length + data.length]; int i; for (i = 0; i < in.length; i++) { array[i] = in[i]; } for (int j = 0; j < data.length; j++) { array[i] = data[j]; i++; } } else array = data; return array; } // 从数组中删除一条记录 public final static Object[] delete(Object[] in, Object[] data) { Object[] array = null; if ((data != null) && (in != null)) { int i, index = 0; int n = 4; System.out.println("data=" + data[1]); for (i = 0; i < in.length; i++) { System.out.println("in[" + i + "]" + in[i]); // if 代码相同 if (in[i].equals(data[1])) { index = i; System.out.println("indexaa=" + index); System.out.println("找到此记录"); break; } } System.out.println("index=" + index); if ((in.length - n) == 0) { array = null; } else { // 创建一个比in少一个单位的数组 Object[] array2 = new Object[in.length - n]; // 往array2存入data前数据 for (i = 0; i < index; i++) { if (in[i] == null) { continue; } else { array2[i] = in[i]; System.out.println("sadasd" + array2[i]); } } // 往array2存入data后数据 for (; i < array2.length; i++) { if (in[i + n] == null) { continue; } else { array2[i] = in[i + n]; System.out.println("sadasd" + array2[i]); } } array = array2; } } else { array = in; System.out.println("请输入型号"); } return array; } }