我有一个针对Java类的项目，在这里我必须制作一个随机访问文件，该文件可以包含数据并可以对数据进行处理。但是，我遇到了一个问题，即“删除”一段数据（将与之相关的所有行替换为“ SPACE”）将编码从UTF-16 BE转换为LE。我在哪里出错了，我该如何解决？
我在编码方面经验不足，我所尝试的只是用小写空格并将单词更改为“ spaced”
[不幸的是，由于我的经验不足，我的代码太乱了，我不知道如何给出最小的代码。对于在此处粘贴几乎整个文件这一事实，我深表歉意。
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
public class CS1181Project01Wheeler {
public static void main(String[] args) {
//main RAF where data is stored
RandomAccessFile data=null;
try {
//creation of file/loading file
data=new RandomAccessFile("data.dat", "rw");
} catch (FileNotFoundException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
System.out.println("this shouldn't be possible");
}
//scanner to scan user input
Scanner userInput=new Scanner(System.in);
boolean finished=false;
System.out.println("Welcome to Project01 random access file reader.");
//the "main menu"/user interface
while(!finished){
System.out.println("Please select what you want to do:");
System.out.println("1. add a film");
System.out.println("2. remove a film");
System.out.println("3. find a film");
System.out.println("4. get stats on all films in this list");
System.out.println("5. about");
System.out.println("6. quit");
int choice=userInput.nextInt();
userInput.nextLine();
//adding a film
if(choice==1){
System.out.println("please enter the title of the film you would like to add");
String title=userInput.nextLine();
String space=null;
boolean done=false;
while(!done){
try {
space=data.readLine();
if(space=="SPACE"){
data.writeChars(title+"\n");
done=true;
}
if(data.getFilePointer()>=data.length()){
data.seek(data.length());
data.writeChars(title+"\n");
done=true;
}
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
break;
}
}
System.out.println("How long is the film in minutes?");
int length=userInput.nextInt();
userInput.nextLine();
//the code for adding the line repeats itself for each question related to the film
done=false;
while(!done){
try {
space=data.readLine();
if(space=="SPACE"){
data.writeChars(length+"\n");
done=true;
}
if(data.getFilePointer()>=data.length()){
data.seek(data.length());
data.writeChars(length+"\n");
done=true;
}
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
break;
}
}
System.out.println("Who is the biggest actor in the film?");
String actor=userInput.nextLine();
done=false;
while(!done){
try {
space=data.readLine();
if(space=="SPACE"){
data.writeChars(actor+"\n");
done=true;
}
if(data.getFilePointer()>=data.length()){
data.seek(data.length());
data.writeChars(actor+"\n");
done=true;
}
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
break;
}
}
System.out.println("What year did it release in?");
int year=userInput.nextInt();
userInput.nextLine();
done=false;
while(!done){
try {
space=data.readLine();
if(space=="SPACE"){
data.writeChars(year+"\n");
done=true;
}
if(data.getFilePointer()>=data.length()){
data.seek(data.length());
data.writeChars(year+"\n");
done=true;
}
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
break;
}
}
System.out.println("What is the height of the biggest actor in cm?");
int height=userInput.nextInt();
userInput.nextLine();
done=false;
while(!done){
try {
space=data.readLine();
if(space=="SPACE"){
data.writeChars(height+"\n");
done=true;
}
if(data.getFilePointer()>=data.length()){
data.seek(data.length());
data.writeChars(height+"\n");
done=true;
}
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
break;
}
}
System.out.println("how was the film received (poor/mixed/good)?");
done=false;
String reception = null;
while(!done){
reception=userInput.nextLine();
if("poor".equals(reception) || "mixed".equals(reception) || "good".equals(reception)){
done=true;
}
else{
System.out.println("Please enter poor, mixed, or good for the reception");
}
}
done=false;
while(!done){
try {
space=data.readLine();
if(space=="SPACE"){
data.writeChars(reception+"\n");
done=true;
}
if(data.getFilePointer()>=data.length()){
data.seek(data.length());
data.writeChars(reception+"\n");
done=true;
}
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
break;
}
}
System.out.println("film added");
}
//removing a film
if(choice==2){
System.out.println("What's the name of the film you want deleted?");
String title=userInput.nextLine();
try {
data.seek(0);
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
}
boolean answer=false;
int titleAmount=0;
long backtrack=0;
char test=0;
//goes through the whole file to find where the film is located
while(!answer){
try {
System.out.println(data.getFilePointer());
test=data.readChar();
} catch (IOException ex) {
System.out.println("film does not exist");
break;
}
//what the code does if a letter matches the film's title
if(test==title.charAt(titleAmount)){
if(titleAmount==0){
try {
backtrack=data.getFilePointer()-1;
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
}
}
titleAmount+=1;
if(titleAmount==title.length()){
answer=true;
System.out.println("move found");
}
}
else{
backtrack=0;
titleAmount=0;
}
}
try {
data.seek(backtrack);
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
}
for(int i=0; i<6; i++){
try {
System.out.println(data.getFilePointer());
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
}
try {
data.writeChars("spaced"+"\n");
} catch (IOException ex) {
Logger.getLogger(CS1181Project01Wheeler.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
RandomAccessFile方法writeChar和writeChars并未声明它们编写UTF-16，但是由于Java字符位于UTF-16中，因此它们确实有效。writeChar总是首先写入高字节，等效于UTF-16BE。
从Javadoc：
将{@code char}作为两个字节的值写入文件，高字节优先。写操作从当前位置开始文件指针。
（（已添加重点）