java银行转账服务实现 java编写银行转账

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锦绣前程未央 2024-02-21 17:33:40
文章标签 java银行转账服务实现 java文档银行管理系统 System java 用户名 文章分类 Java 后端开发
package sdut.ligong.demo;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Scanner;
public class FileReadAndFileWrite {
static Scanner input = new Scanner(System.in);
public static boolean mIsTransfer = false; // 判断是否是转账状态 false-否
static Double transferMoney = 0.0; //转账的钱
/**
* 将用户名为userName 保存到数据库中 如果用户名在数据库中存在
*/
public static boolean saveUserData(final String userName) throws Exception {
// 读取文件
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData.txt")));
// 写文件
PrintWriter
pw = new PrintWriter("c:\\dataBase\\userData4.txt");
// 判断文件是否存在
boolean mIsExists = false; // 默认用户名不存在
String line = null;
while ((line = br.readLine()) != null) {
if (userName.equals(line)) {
mIsExists = true;
}
pw.println(line);
pw.flush();
}
if (mIsExists) {
mIsExists = !mIsExists;
return false; // 用户名已存在
} else { // 将用户名写入文件中
User u = new User(userName);
pw.println(u.getId());
pw.flush();
pw.println(u.getUserName());
pw.flush();
pw.println(u.getPassword());
pw.flush();
pw.println(u.getMoney());
pw.flush();
pw.println(u.getCreateAccountData());
pw.flush();
}
br.close();
pw.close();
// 将userData4中的内容写入到userData中
BufferedReader br2 = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData4.txt")));
PrintWriter pw2 = new PrintWriter("c:\\dataBase\\userData.txt");
line = null;
while ((line = br2.readLine()) != null) {
pw2.println(line);
pw2.flush();
}
br2.close();
pw2.close();
br = new BufferedReader(new InputStreamReader(new FileInputStream(
"c:\\dataBase\\userData4.txt")));
System.out.println("---------------------创建后的用户名----------------");
int count = 0;
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
System.out
.println("------------------------------------------");
}
count = count + 1;
System.out.println(line);
}
System.out.println("---------------------显示结束-----------------------");
System.out.println();
System.out.println();
br.close();
// copyUserDataToUserData4();
// copyUserData4ToUserData();
return true;
}
/**
* 读取用户的编号
*
*@return
*@throws Exception
*/
public static String readCount() throws Exception {
BufferedReader br2 = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData.txt")));
PrintWriter pw2 = new PrintWriter("c:\\dataBase\\userData4.txt");
int count = 0, count1 = 0;
String line = null;
while ((line = br2.readLine()) != null) {
if (count % 5 == 0) {
count1++;
pw2.println(count1);
pw2.flush();
} else {
pw2.println(line);
pw2.flush();
}
count++;
}
int C = count1 + 1;
pw2.close();
br2.close();
copyUserData4ToUserData();
copyUserDataToUserData4();
return C + "";
}
/**
* 根据编号 从数据库中找对应编号的用户信息
*
*@param index
*@throws Exception
*/
public static void findNumUser(int index) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData.txt")));
String line = null;
int count = 0;
boolean isFind = false;
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
if (line.equals("" + index)) {
isFind = true;
System.out.println("账号编号:" + line);
for (int i = 0; i < 4; i++) {
line = br.readLine();
if (i == 0) {
System.out.println("用户名为:" + line);
} else if (i == 1) {
System.out.println("账户密码为:" + line);
} else if (i == 2) {
System.out.println("账户余额为:" + line + "元");
} else if (i == 3) {
System.out.println("创建账户日期为:" + line);
}
}
break;
}
} else {
isFind = false;
}
count += 1;
}
br.close();
if (!isFind) {
System.out.println("未找到该用户");
Thread.sleep(2000);
System.out.println();
System.out.println();
}
}
/**
* 根据姓名查找对应的用户信息
*
*@param index
*@throws Exception
*/
public static void findNameUser(String index) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData.txt")));
String line = null;
String preline = null;
boolean isChanged = false;
int count = 4;
boolean isFind = false;
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
if (line.equals(index)) {
isFind = true;
isChanged = true;
break;
}
} else {
// System.out.println("line ====== "+line+" count==="+count);
}
count += 1;
preline = line;
}
br.close();
if (!isFind) {
System.out.println("未找到该用户");
Thread.sleep(2000);
System.out.println();
System.out.println();
}
if (isChanged) {
// System.out.println("用户的编号为"+preline);
findNumUser(Integer.parseInt(preline));
}
}
/**
* 按照用户名编号修改
*
*@param index
*@throws Exception
*/
public static void modifyNumUser(int index) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData4.txt")));
PrintWriter pw2 = new PrintWriter("c:\\dataBase\\userData.txt");
String line = null;
int count = 0;
boolean isSucceed = false;
boolean isChanged = true; // 判断是否改写数据库
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
if (line.equals("" + index)) {
System.out.println("是否要修改用户密码 1-是,0-否");
int choose = input.nextInt();
isSucceed = true;
if (choose == 1) {
line = br.readLine();
String line1 = br.readLine();
System.out.println("请输入用户初始密码");
String line3 = input.next();
if (line3.equals(line1)) {
System.out.println("验证成功!");
System.out.println("请输入要修改的密码");
String password = input.next();
System.out.println("用户编号:" + index);
pw2.println(index);
pw2.flush();
System.out.println("用户名:" + line);
pw2.println(line);
pw2.flush();
System.out.println("用户密码:" + password);
pw2.println(password);
pw2.flush();
line = br.readLine();
System.out.println("用户余额:" + line);
pw2.println(line);
pw2.flush();
line = br.readLine();
System.out.println("账户创建日期:" + line);
pw2.println(line);
pw2.flush();
} else {
System.out.println("密码错误!");
Thread.sleep(1000);
isChanged = false;
break;
}
} else {
System.out.println("退出查询");
isChanged = false; // 不改变文件
break;
}
} else {
//System.out.println("匹配名称line=="+line+"count=="+count);
pw2.println(line);
pw2.flush();
}
} else {
//System.out.println("5的倍数line=="+line+"count=="+count);
pw2.println(line);
pw2.flush();
}
count = count + 1;
}
if (!isSucceed) {
System.out.println("未找到用户");
}
br.close();
pw2.close();
if (!isChanged) {
copyUserData4ToUserData();
}
copyUserDataToUserData4();
copyUserData4ToUserData();
}
/**
* 按照用户姓名修改密码
*
*@param name
*@throws Exception
*/
public static void modifyNameUser(String name) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData.txt")));
String line = null;
String preline = null;
int count = 4;
boolean isFind = false;
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
if (line.equals(name)) {
isFind = true;
modifyNumUser(Integer.parseInt(preline));
}
} else {
}
count += 1;
preline = line;
}
br.close();
if (!isFind) {
System.out.println("未找到该用户");
Thread.sleep(2000);
System.out.println();
System.out.println();
}
}
public static void deleteNameUser(String name) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData.txt")));
String line = null;
String preline = null;
int count = 4;
boolean isFind = false;
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
if (line.equals(name)) {
isFind = true;
// System.out.println("用户编号:" + preline);
deleteNumUser(Integer.parseInt(preline));
}
} else {
}
count += 1;
preline = line;
}
br.close();
if (!isFind) {
System.out.println("未找到该用户");
Thread.sleep(2000);
System.out.println();
System.out.println();
}
}
/**
* 按照用户名编号修改
*
*@param index
*@throws Exception
*/
public static void deleteNumUser(int index) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData4.txt")));
PrintWriter pw2 = new PrintWriter("c:\\dataBase\\userData.txt");
String line = null;
int count = 0;
boolean isSucceed = false;
boolean isChanged = false;
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
if (line.equals("" + index)) {
System.out.println("是否要删除用户 1-是,0-否");
int choose = input.nextInt();
isSucceed = true;
if (choose == 1) {
line = br.readLine();
String line1 = br.readLine();
System.out.println("请输入用户初始密码");
String line3 = input.next();
if (line3.equals(line1)) {
System.out.println("删除成功!");
Thread.sleep(2000);
pw2.println("");
pw2.flush();
pw2.println("");
pw2.flush();
pw2.println("");
pw2.flush();
line = br.readLine();
pw2.println("");
pw2.flush();
line = br.readLine();
} else {
System.out.println("密码输入错误!");
isChanged = true; // 文件改变了
}
} else {
System.out.println("退出查询");
}
} else {
pw2.println(line);
pw2.flush();
}
} else {
pw2.println(line);
pw2.flush();
}
count = count + 1;
}
if (!isSucceed) {
System.out.println("未找到用户");
}
br.close();
pw2.close();
if (isChanged) {
copyUserData4ToUserData();
}
copyUserDataToUserData4();
copyUserData4ToUserData();
}
/**
* 将文件1复制到文件4
*
*@throws Exception
*/
public static void copyUserDataToUserData4() throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData.txt")));
PrintWriter pw = new PrintWriter("c:\\dataBase\\userData4.txt");
String line = null;
while ((line = br.readLine()) != null) {
if (!line.equals("")) {
pw.println(line);
pw.flush();
}
}
br.close();
pw.close();
}
/**
* 将文件4复制到文件1
*
*@throws Exception
*/
public static void copyUserData4ToUserData() throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData4.txt")));
PrintWriter pw = new PrintWriter("c:\\dataBase\\userData.txt");
String line = null;
while ((line = br.readLine()) != null) {
if (!line.equals("")) {
pw.println(line);
pw.flush();
}
}
br.close();
pw.close();
}
public static void saveNumUserOfMoney(int index) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData4.txt")));
PrintWriter pw2 = new PrintWriter("c:\\dataBase\\userData.txt");
String line = null;
int count = 0;
Double fee = 0.0;
String preline = null;
boolean isChanged = true;
boolean isSucceed = true;
if (!mIsTransfer) {
System.out.println("请输入要存入的金额");
fee = input.nextDouble();
if (fee <= 0) {
System.out.println("金额必须大于0");
fee = 0.0;
}
} else {
System.out.println("进入转账状态!");
fee = transferMoney;
}
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
if (line.equals("" + index)) { // 找到该编号
String name = br.readLine(); // 获得用户名
String password = br.readLine(); // 获得密码
System.out.println("请输入账号密码");
String pass = input.next();
if (!pass.equals(password)) {
isChanged = false;
isSucceed = false;
System.out.println("密码输入错误!");
Thread.sleep(1200);
break;
} else {
System.out.println("存入金额:" + fee);
Double sum = Double.parseDouble(br.readLine());
sum += fee;
System.out.println("账户余额:" + sum);
pw2.println(index);
pw2.flush();
pw2.println(name);
pw2.flush();
pw2.println(password);
pw2.flush();
pw2.println(sum);
pw2.flush();
line = br.readLine();
System.out.println("创建账户日期:" + line);
pw2.println(line);
pw2.flush();
}
} else {
pw2.println(line);
pw2.flush();
}
} else {
pw2.println(line);
pw2.flush();
}
count++;
preline = line;
}
br.close();
pw2.close();
if (!isChanged) {
copyUserData4ToUserData();
}
copyUserDataToUserData4();
copyUserData4ToUserData();
}
/**
* 按照用户名进行存款
*
*@param name
*@throws Exception
*/
public static void saveNameUserOfMoney(String name) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData4.txt")));
String line = null;
String preline = null;
boolean isChanged = false;
int count = 4;
boolean isFind = false;
Double fee;
// if (!mIsTransfer) {
// System.out.println("请输入要存入的金额");
// fee = input.nextDouble();
// if (fee <= 0) {
// System.out.println("金额必须大于0");
// fee = 0.0;
// }
// } else {
// fee = transferMoney;
// }
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
if (line.equals(name)) {
isFind = true;
isChanged = true;
// System.out.println("name=="+line);
// System.out.println("preline=="+preline);
saveNumUserOfMoney(Integer.parseInt(preline));
break;
}
} else {
// System.out.println("line ====== "+line+" count==="+count);
}
count += 1;
preline = line;
}
br.close();
if (!isFind) {
System.out.println("未找到该用户");
Thread.sleep(2000);
System.out.println();
System.out.println();
}
if (isChanged) {
// System.out.println("用户的编号为"+preline);
findNumUser(Integer.parseInt(preline));
}
br.close();
if (!isChanged) {
copyUserData4ToUserData();
}
copyUserDataToUserData4();
copyUserData4ToUserData();
}
/**
* 按照用户名进行取款
*
*@param name
*@throws Exception
*/
public static void takeNameUserOfMoney(String name) throws Exception {
boolean isSucceed = false;
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData4.txt")));
PrintWriter pw2 = new PrintWriter("c:\\dataBase\\userData.txt");
String line = null;
String preline = null;
int count = 3;
boolean isChanged = true;
while ((line = br.readLine()) != null) {
count = count + 1;
if (count % 5 == 0) {
if (line.equals(name)) {
isSucceed = true;
int choose = 1;
if (choose == 1) {
String line3 = null;
line = br.readLine(); // 获取用户密码
if(mIsTransfer){
line3 = line;
}else{
System.out.println("请输入用户密码");
line3 = input.next();
}
if (line3.equals(line)) { // 验证用户密码
Double fee = null;
if(mIsTransfer){
fee = transferMoney;
}else{
System.out.println("请输入要取出的金额");
fee = input.nextDouble();
}
System.out.println("用户编号:" + preline);
System.out.println("用户名:" + name);
pw2.println(name);
pw2.flush();
System.out.println("用户密码:" + line3);
pw2.println(line3);
pw2.flush();
line = br.readLine();
Double sum = Double.parseDouble(line);
System.out.println("用户余额:" + sum);
if (fee <= sum) {
fee = fee;
} else {
System.out.println("取款失败");
fee = 0.0;
Thread.sleep(1500);
isChanged = false;
break;
}
System.out.println("要取出的金额为:" + fee);
sum -= fee;
System.out.println("取出之后的金额为:" + sum);
pw2.println(sum);
pw2.flush();
line = br.readLine();
System.out.println("账户创建日期:" + line);
pw2.println(line);
pw2.flush();
isSucceed = true;
} else {
System.out.println("用户密码错误");
line = br.readLine();
pw2.println(line);
pw2.flush();
isChanged = false;
break;
}
} else {
System.out.println("程序退出");
isChanged = false;
break;
}
} else {
pw2.println(line);
pw2.flush();
}
} else {
pw2.println(line);
pw2.flush();
}
preline = line;
}
if (!isSucceed) {
System.out.println("未找到用户");
}
br.close();
pw2.close();
if (!isChanged) {
copyUserData4ToUserData();
}
copyUserDataToUserData4();
copyUserData4ToUserData();
}
/**
* 按照用户编号进行取款
*
*@param index
*@throws Exception
*/
public static void takeNumUserOfMoney(int index) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData4.txt")));
PrintWriter pw2 = new PrintWriter("c:\\dataBase\\userData.txt");
String line = null;
int count = 0;
boolean isSucceed = false;
boolean isChanged = true;
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
if (line.equals("" + index)) {
isSucceed = true;
int choose = 1;
if (choose == 1) {
line = br.readLine();
String line1 = br.readLine();
String line3 = null;
if(mIsTransfer){
line3 = line1;
}else{
System.out.println("请输入用户初始密码");
line3 = input.next();
}
if (line3.equals(line1)) {
System.out.println("验证成功!");
Double fee = 0.0;
if(mIsTransfer){
fee = transferMoney;
}else{
System.out.println("请输入要取出的金额");
fee = input.nextDouble();
}
System.out.println("用户编号:" + index);
pw2.println(index);
pw2.flush();
System.out.println("用户名:" + line);
pw2.println(line);
pw2.flush();
System.out.println("用户密码:" + line3);
pw2.println(line3);
pw2.flush();
line = br.readLine();
Double sum = Double.parseDouble(line);
if (fee <= sum) {
fee = fee;
} else {
fee = 0.0;
System.out.println("取款失败!");
Thread.sleep(1500);
isChanged = false;
break;
}
System.out.println("用户余额取款前余额为" + sum + "元");
sum -= fee;
System.out
.println("取款后" + fee + "元后余额为" + sum + "元");
pw2.println(sum);
pw2.flush();
line = br.readLine();
System.out.println("账户创建日期:" + line);
pw2.println(line);
pw2.flush();
} else {
System.out.println("密码输入错误!");
isChanged = false;
break;
}
} else {
System.out.println("退出查询");
isChanged = false;
break;
}
} else {
pw2.println(line);
pw2.flush();
}
} else {
pw2.println(line);
pw2.flush();
}
count = count + 1;
}
if (!isSucceed) {
System.out.println("未找到用户");
}
br.close();
pw2.close();
if(!isChanged){
copyUserData4ToUserData();
}
copyUserDataToUserData4();
copyUserData4ToUserData();
}
public static void transferNameUserOfMoney(String name) throws Exception {
mIsTransfer = true;
boolean isSucceed = false;
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData4.txt")));
PrintWriter pw2 = new PrintWriter("c:\\dataBase\\userData.txt");
String line = null;
String preline = null;
int count = 3;
boolean isChanged = true;
while ((line = br.readLine()) != null) {
count = count + 1;
if (count % 5 == 0) {
if (line.equals(name)) {
isSucceed = true;
int choose = 1;
if (choose == 1) {
line = br.readLine(); // 获取用户密码
System.out.println("请输入用户密码");
String line3 = input.next();
if (line3.equals(line)) { // 验证用户密码
transferNumUserOfMoney(Integer.parseInt(preline));
//
} else {
System.out.println("用户密码错误");
line = br.readLine();
pw2.println(line);
pw2.flush();
Thread.sleep(1500);
isChanged = false;
break;
}
} else {
System.out.println("程序退出");
Thread.sleep(1500);
isChanged = false;
break;
}
} else {
pw2.println(line);
pw2.flush();
}
} else {
pw2.println(line);
pw2.flush();
}
preline = line;
}
if (!isSucceed) {
System.out.println("未找到用户");
}
br.close();
pw2.close();
if(!isChanged){
copyUserData4ToUserData();
}
copyUserDataToUserData4();
copyUserData4ToUserData();
mIsTransfer = !mIsTransfer;
}
public static void transferNumUserOfMoney(int index) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream("c:\\dataBase\\userData4.txt")));
PrintWriter pw2 = new PrintWriter("c:\\dataBase\\userData.txt");
String line = null;
int count = 0;
int cho = 0;
boolean isSucceed = false;
boolean isChanged = true;
while ((line = br.readLine()) != null) {
if (count % 5 == 0) {
if (line.equals("" + index)) {
isSucceed = true;
int choose = 1;
if (choose == 1) {
line = br.readLine();
String line1 = br.readLine();
System.out.println("请输入转出账户的初始密码");
String line3 = input.next();
if (line3.equals(line1)) {
System.out.println("验证成功!");
System.out.println("请输入要转出的金额");
Double fee = input.nextDouble();
transferMoney = fee;
pw2.println(index);
pw2.flush();
pw2.println(line);
pw2.flush();
pw2.println(line3);
pw2.flush();
line = br.readLine();
Double sum = Double.parseDouble(line);
if (fee <= sum) {
fee = fee;
} else {
fee = 0.0;
System.out.println("取款失败!");
Thread.sleep(1000);
isChanged = false;
break;
}
System.out.println("用户余额转出前余额为" + sum + "元");
sum -= fee;
System.out
.println("转出" + fee + "元后余额为" + sum + "元");
pw2.println(sum);
pw2.flush();
line = br.readLine();
// System.out.println("账户创建日期:" + line);
pw2.println(line);
pw2.flush();
System.out.println("请选择要转出账户的方式");
System.out.println("1.按账户编号转入");
System.out.println("2.按账户名号转入");
cho = input.nextInt();
mIsTransfer = true;
isSucceed = true;
break;
} else {
System.out.println("密码输入错误!");
Thread.sleep(1000);
isChanged = false;
break;
}
} else {
System.out.println("退出查询");
Thread.sleep(1000);
isChanged = false;
break;
}
} else {
pw2.println(line);
pw2.flush();
}
} else {
pw2.println(line);
pw2.flush();
}
count = count + 1;
}
if (!isSucceed) {
System.out.println("未找到用户");
}
br.close();
pw2.close();
if(!isChanged){
copyUserData4ToUserData();
}
copyUserDataToUserData4();
copyUserData4ToUserData();
if (cho == 1) {
System.out.println("请输入要转入的账户的编号");
int index1 = input.nextInt();
takeNumUserOfMoney(index1);
saveNumUserOfMoney(index1);
} else {
System.out.println("请输入要转入的账户的名称");
String name = input.next();
takeNameUserOfMoney(name);
saveNameUserOfMoney(name);
}
mIsTransfer = !mIsTransfer;
}
}
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