Java BufferedWriter 覆盖现有文件
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BufferedWriter writes over existing file
提问by Victor Strandmoe
I'm trying to create a program which saves text on a file and then text can be added onto the file. However, every time i try to write to the file, it overwrites it and doesn't write anything. I need it to add whatever information i want it UNDER the rest.
我正在尝试创建一个将文本保存在文件中的程序，然后可以将文本添加到文件中。但是，每次我尝试写入文件时，它都会覆盖它并且不写入任何内容。我需要它在其余部分添加我想要的任何信息。
FileReader input;
BufferedReader readFile;
FileWriter output;
BufferedWriter writeFile;
try {
// input = new FileReader(password_file);
//readFile = new BufferedReader(input);
output = new FileWriter(password_file);
writeFile = new BufferedWriter(output);
//while ((temp_user= readFile.readLine()) !=null) {
//temp_pass = readFile.readLine();
//}
temp_user = save_prompt.getText();
temp_pass = final_password;
//Writes to the file
writeFile.write(temp_user);
writeFile.newLine();
writeFile.write(temp_pass);
}
catch(IOException e) {
System.err.println("Error: " + e.getMessage());
}
}
回答by PTwr
What you seek for is Appendmode.
你要找的是追加模式。
new FileWriter(file,true); // true = append, false = overwrite
回答by La-comadreja
Whenever you type
每当你打字
new BufferedWriter(output);
or "write", you are overwriting the "output" file. Try to make sure you only declare a new BufferedWriter once throughout the course of the program, and append() to the file instead of write().
或“写入”，您正在覆盖“输出”文件。尽量确保在整个程序过程中只声明一次新的 BufferedWriter，并将 append() 附加到文件而不是 write()。
回答by Sibbo
回答by Salih Erikci
Replace all existing content with new content.
用新内容替换所有现有内容。
new FileWriter(file);
Keep the existing content and appendthe new content in the end of the file.
保留现有内容并将新内容附加到文件末尾。
new FileWriter(file,true);
Example:
例子：
FileWriter fileWritter = new FileWriter(file.getName(),true);
BufferedWriter bufferWritter = new BufferedWriter(fileWritter);
bufferWritter.write(data);
bufferWritter.close();
回答by imandrewd
change the FileWrite liner to:
将 FileWrite 衬垫更改为：
output = new FileWriter(password_file, true);
which tells FileWriter to append
它告诉 FileWriter 追加
http://docs.oracle.com/javase/7/docs/api/java/io/FileWriter.html
http://docs.oracle.com/javase/7/docs/api/java/io/FileWriter.html
