Java 当我添加一个播放器时，它会删除文本文件中的所有内容，我如何修复这个问题？

滚动到底部查看添加播放器代码，它会删除文本文件中的所有内容，而不是添加。请给我一个人掌舵，因为我的高中项目明天就要交了。非常感谢

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.*;
import java.util.Scanner;
import java.io.PrintWriter;
/**
 * Soccer Database, can search statistics of players with several different options. 
 * 
 * @author (Sachin Khargie) 
 * @version (10/1/2014)
 */
public class FinalProject3
{
    static Scanner sc= new Scanner(System.in);
    static Scanner sc2= new Scanner(System.in);    
    static String names[] = {"Angel Di Maria", "Neymar Da Silva Santos", "Leo Messi", "Chrstiano Ronaldo", "Eden Hazard", "Diego Costa", "Benzema", "David De Gea", "Wayne Rooney", "Radamel Falcao", "Sachin Khargie", "Shawn Heaton",};
    static double salary[] = {21000000, 20000000, 22000000, 22000000, 19000000, 18000000, 20000000, 15000000, 16000000, 17000000, 40000000, 40000000};
    static String players[] = {"Angel Di Maria", "Neymar Da Silva Santos", "Leo Messi", "Chrstiano Ronaldo", "Eden Hazard", "Diego Costa", "Benzema", "David De Gea", "Wayne Rooney", "Radamel Falcao", "Sachin Khargie", "Shawn Heaton",};
    static double ratings[] = {86, 86, 93, 92, 88, 85, 85, 85, 86, 88, 95, 95};
    public static void main (String args[]) throws IOException
    {

        BufferedReader input = new BufferedReader (new FileReader ("soccerdata.txt"));
        int menu;
        System.out.println("Welcome to the Soccer Player Database."); 
        while (true)
        {
            System.out.println("1. Search for the players salary by name (Press 1)"); 
            System.out.println("2. Search for the Players club (press 2)");
            System.out.println("3. Search for the Players postion (press 3)");
            System.out.println("4. Enter club to find out the players that play for that club (press 4)");
            System.out.println("5. This option will output the salaries of the players then sorts it from lowest to greatest(press 5)");
            System.out.println("6. Enter the players name to find out their rating (press 6)");
            System.out.println("7. This option will output the ratings of the players then sorts it from lowest to greatest (press 7)");
            System.out.println("8. Add a player to the database"); 
            menu = sc.nextInt();


            if (menu == 1)
                nametoSalary();
            else if (menu == 2)
                nametoClub();
            else if (menu == 3)
                nametoPostion();
            else if (menu == 4)
                clubtoPlayer();
            else if (menu == 5)
                sortbySalary();
            else if (menu == 6)
                nametoRating();
            else if (menu == 7)
                sortbyRating();
            else if (menu == 8)
                addPlayer();








    }

}
public static void nametoSalary () throws IOException
    {
        BufferedReader i = new BufferedReader (new FileReader ("soccerdata.txt"));
        String data=i.readLine();

        String player="";


        System.out.println("Enter the Name of the player:");
        player = sc2.nextLine();


        String salary="";
        boolean found=false;
        while (data!=null)
        {
            String database[]=data.split(",");
            data=i.readLine();
            if (data!=null)
            {
                for (int x=0;x<data.length(); ++x)
                {
                    if (database[0].equalsIgnoreCase(player)) 
                    {
                        salary=database[1];
                        found=true;
                        break;
                    }
                }
            }
        }

        if (found==true)
        {
            System.out.println();
            System.out.println("The salary of that player is " + "" + salary);
            System.out.println();
        }   

        else if (found==false)
        {
            System.out.println();
            System.out.println("That player does not exist in the database");
            System.out.println(); 
        }
    }
public static void nametoClub () throws IOException
    {
         BufferedReader i = new BufferedReader (new FileReader ("soccerdata.txt"));
         String data=i.readLine();

         String player="";

         System.out.println("Enter the Name of the player to find out what club they play for:");
         player = sc2.nextLine();
         String club="";
        boolean found=false;
        while (data!=null)
        {
            String database[]=data.split(",");
            data=i.readLine();
            if (data!=null)
            {
                for (int x=0;x<data.length(); ++x)
                {
                    if (database[0].equalsIgnoreCase(player)) 
                    {
                        club=database[2];
                        found=true;
                        break;
                    }
                }
            }
        }
         if (found==true)
        {
            System.out.println();
            System.out.println("The club of that player is " + "" + club);
            System.out.println();
        }   

        else if (found==false)
        {
            System.out.println();
            System.out.println("That player does not exist in the database");
            System.out.println(); 
        }
    }
public static void nametoPostion () throws IOException
    {
         BufferedReader i = new BufferedReader (new FileReader ("soccerdata.txt"));
         String data=i.readLine();

         String player="";

         System.out.println("Enter the Name of the player to find out what postion they play for:");
         player = sc2.nextLine();
         String postion="";
        boolean found=false;
        while (data!=null)
        {
            String database[]=data.split(",");
            data=i.readLine();
            if (data!=null)
            {
                for (int x=0;x<data.length(); ++x)
                {
                    if (database[0].equalsIgnoreCase(player)) 
                    {
                        postion=database[3];
                        found=true;
                        break;
                    }
                }
            }
        }
         if (found==true)
        {
            System.out.println();
            System.out.println("The postion of that player is " + "" + postion);
            System.out.println();
        }   

        else if (found==false)
        {
            System.out.println();
            System.out.println("That postion does not exist in the database");
            System.out.println(); 
        }
    }
public static void clubtoPlayer () throws IOException
    {
         BufferedReader i = new BufferedReader (new FileReader ("soccerdata.txt"));
         String data=i.readLine();

         String club="";

         System.out.println("Enter the Name of the club to find out what players are playing for that club in the current list");
         club= sc2.nextLine();
         String player="";
        boolean found=false;
        while (data!=null)
        {
            String database[]=data.split(",");
            data=i.readLine();
            if (data!=null)
            {
                for (int x=0;x<data.length(); ++x)
                {
                    if (database[0].equalsIgnoreCase(club)) 
                    {
                        player=database[1];
                        found=true;
                        break;
                    }
                }
            }
        }
         if (found==true)
        {
            System.out.println();
            System.out.println("The players that play for that club are " + "" + player);
            System.out.println();
        }   

        else if (found==false)
        {
            System.out.println();
            System.out.println("That club does not exist in the database");
            System.out.println(); 
        }
    }
public static void sortbySalary()
{
       System.out.println("-------------------------------");
       System.out.println("Original List");
       System.out.println("-------------------------------");
       printThese (names, salary);
       System.out.println("-------------------------------");
       System.out.println("Sorted List");
       sortThese(names,salary);
       System.out.println("-------------------------------");
       printThese (names,salary);
       System.out.println("-------------------------------");
}
public static void printThese(String n[], double m[])
        {
         for (int x=0;x<n.length;++x)
         {
           System.out.println(n[x] + "  " + m[x]);
           }

        }
public static void sortThese(String n[],double m[])
        {
            for (int x=0;x<n.length;++x)
            {
                for (int y=0;y<n.length-1;++y)
                {
                    if (m[y]> m[y+1])
                    {
                        String temp=n[y];
                        n[y]=n[y+1];
                        n[y+1]=temp;

                        double temp2=m[y];
                        m[y]=m[y+1];
                        m[y+1]=temp2;
                       }
                   }


           }


        }
public static void nametoRating () throws IOException
    {
         BufferedReader i = new BufferedReader (new FileReader ("soccerdata.txt"));
         String data=i.readLine();

         String player="";

         System.out.println("Enter the Name of the player to find out there rating");
         player= sc2.nextLine();
         String rate="";
        boolean found=false;
        while (data!=null)
        {
            String database[]=data.split(",");
            data=i.readLine();
            if (data!=null)
            {
                for (int x=0;x<data.length(); ++x)
                {
                    if (database[0].equalsIgnoreCase(player)) 
                    {
                        rate=database[4];
                        found=true;
                        break;
                    }
                }
            }
        }
         if (found==true)
        {
            System.out.println();
            System.out.println("The players rating is " + "" + rate);
            System.out.println();
        }   

        else if (found==false)
        {
            System.out.println();
            System.out.println("That player does not exist in the database or the rating has not been entered into the database");
            System.out.println(); 
        }
    }
public static void sortbyRating()
        {
       System.out.println("-------------------------------");
       System.out.println("Original list");
       System.out.println("-------------------------------");
       printThese (players, ratings);
       sortThese(players,ratings);
       System.out.println("-------------------------------");
       System.out.println("Sorted List");
       System.out.println("-------------------------------");
       printThese (players,ratings);
       System.out.println("-------------------------------");
        }
public static void outputThese(String n[], double m[])
        {
         for (int x=0;x<n.length;++x)
         {
           System.out.println(n[x] + "  " + m[x]);
           }

        }
public static void sortThem(String n[],double m[])
        {
            for (int x=0;x<n.length;++x)
            {
                for (int y=0;y<n.length-1;++y)
                {
                    if (m[y]> m[y+1])
                    {
                        String temp=n[y];
                        n[y]=n[y+1];
                        n[y+1]=temp;

                        double temp2=m[y];
                        m[y]=m[y+1];
                        m[y+1]=temp2;
                       }
                   }


           }


        }
public static void addPlayer() throws IOException
    {
        BufferedReader input = new BufferedReader (new FileReader ("soccerdata.txt"));
        String data=input.readLine();

        PrintWriter newPlayer= new PrintWriter(new FileWriter("soccerdata.txt"));

        String add="";

        String i[]=new String [5];

        System.out.println("Enter Players Name");
        add = sc.next();
        newPlayer.println(add + ",");

        System.out.println("Enter Players Salary");
        add = sc.next();
        newPlayer.println(add + ",");

        System.out.println("Enter Players Club ");
        add = sc.next();
        newPlayer.println(add + ",");

        System.out.println("Enter Players Postion");
        add = sc.next();
        newPlayer.println(add + ",");

        System.out.println("Enter Players Rating");
        add = sc.next();
        newPlayer.println(add + ",");

        System.out.println(" ");
        System.out.println("Player has been added to the database.");
        System.out.println(" ");
}
}

导入java.io.BufferedWriter；
导入java.io.File；
导入java.io.FileWriter；
导入java.io.*；
导入java.util.Scanner；
导入java.io.PrintWriter；
/**
*足球数据库，可以搜索具有多个不同选项的球员的统计信息。
* 
*@作者（Sachin Khargie）
*@版本（10/1/2014）
*/
公共类最终项目3
{
静态扫描仪sc=新扫描仪（System.in）；
静态扫描仪sc2=新扫描仪（System.in）；
静态字符串名称[]={“安吉尔·迪·玛丽亚”、“内马尔·达席尔瓦·桑托斯”、“利奥·梅西”、“克里斯蒂亚诺·罗纳尔多”、“伊登·哈扎德”、“迭戈·科斯塔”、“本泽马”、“大卫·德赫亚”、“韦恩·鲁尼”、“拉达梅尔·法尔考”、“萨钦·哈吉”、“肖恩·希顿”}；
静态双薪[]={21000000、20000000、22000000、22000000、19000000、18000000、20000000、15000000、16000000、17000000、40000000、40000000}；
静态弦乐演奏者[]={“安吉尔·迪玛丽亚”、“内马尔·达席尔瓦·桑托斯”、“利奥·梅西”、“克里斯蒂亚诺·罗纳尔多”、“伊登·哈扎德”、“迭戈·科斯塔”、“本泽马”、“大卫·德赫亚”、“韦恩·鲁尼”、“拉达梅尔·法尔考”、“萨钦·哈吉”、“肖恩·希顿”}；
静态双重评级[]={86,86,93,92,88,85,85,85,86,88,95,95}；
公共静态void main（字符串args[]）引发IOException
{
BufferedReader输入=新的BufferedReader（新文件读取器（“soccerdata.txt”）；
int菜单；
System.out.println（“欢迎来到足球运动员数据库”）；
while（true）
{
System.out.println（“1.按姓名搜索球员工资（按1）”；
System.out.println（“2.搜索球员俱乐部（按2）”；
System.out.println（“3.搜索玩家位置（按3）”；
System.out.println（“4.进入俱乐部查找为该俱乐部踢球的球员（按4）”；
System.out.println（“5.此选项将输出球员的工资，然后将其从最低到最高排序（按5）”；
System.out.println（“6.输入玩家姓名以了解他们的等级（按6）”；
System.out.println（“7.此选项将输出玩家的评级，然后将其从最低到最高排序（按7）”；
System.out.println（“8.向数据库添加播放器”）；
menu=sc.nextInt（）；
如果（菜单==1）
nametoSalary（）；
否则如果（菜单==2）
nametoClub（）；
否则如果（菜单==3）
nametoPostion（）；
else if（菜单==4）
clubtoPlayer（）；
否则如果（菜单==5）
sortbySalary（）；
否则如果（菜单==6）
命名（）；
否则如果（菜单==7）
sortbyRating（）；
否则如果（菜单==8）
addPlayer（）；
}
}
公共静态void nametoSalary（）引发IOException
{
BufferedReader i=新的BufferedReader（新文件读取器（“soccerdata.txt”）；
字符串数据=i.readLine（）；
弦乐演奏家=”；
System.out.println（“输入玩家名称：”）；
player=sc2.nextLine（）；
字符串salary=“”；
布尔值=false；
while（数据！=null）
{
字符串数据库[]=data.split（“，”）；
数据=i.readLine（）；
如果（数据！=null）
{
对于（int x=0；x，您的FileWriter将覆盖文件而不是添加到其中

若要追加，请在构造函数中指定so

即：

此外，直到您刷新磁盘，才真正写入磁盘，因此在PrintWriter上调用flush（），或者在构建它时，指定希望它自动刷新，如下所示：

new PrintWriter(fileWriter,true);

首先，在
addPlayer
方法中，您在覆盖模式下创建了
FileWriter
，默认情况下会发生这种情况。其次，您不会关闭
PrintWriter

用于打开附加模式，并关闭
PrintWriter

您还应该关闭方法末尾的
BufferedReader

如果您使用的是Java 7或更高版本，您可以使用在完成后自动关闭
BufferedReader
和
PrintWriter
。
您能给我们一个文本文件的示例吗？例如，文件soccerdata.txt的结构如何？请只发布与您的问题相关的代码。如果问题在一种方法中od，那么请只发布该方法的代码。给我发电子邮件，我会把文本文件发给你
new PrintWriter(fileWriter,true);