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冷日
(冷日) 發表時間：2019/4/5 14:54

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註冊日: 2008/2/19
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發表數: 15771

[轉貼]How to write a UTF-8 file with Java?

How to write a UTF-8 file with Java?

I have some current code and the problem is its creating a 1252 codepage file, i want to force it to create a UTF-8 file
Can anyone help me with this code, as i say it currently works... but i need to force the save on utf.. can i pass a parameter or something??
this is what i have, any help really appreciated

var out = new java.io.FileWriter( new java.io.File( path )),
        text = new java.lang.String( src || "" );
    out.write( text, 0, text.length() );
    out.flush();
    out.close();

Instead of using FileWriter, create a FileOutputStream. You can then wrap this in an OutputStreamWriter, which allows you to pass an encoding in the constructor. Then you can write your data to that inside a try-with-resources Statement:

try (OutputStreamWriter writer =
             new OutputStreamWriter(new FileOutputStream(PROPERTIES_FILE), StandardCharsets.UTF_8))
    // do stuff
}

Try this

Writer out = new BufferedWriter(new OutputStreamWriter(
    new FileOutputStream("outfilename"), "UTF-8"));
try {
    out.write(aString);
} finally {
    out.close();
}

Try using FileUtils.write from Apache Commons.
You should be able to do something like:

File f = new File("output.txt");
FileUtils.writeStringToFile(f, document.outerHtml(), "UTF-8");

This will create the file if it does not exist.

All of the answers given here wont work since java's UTF-8 writing is bugged.
http://tripoverit.blogspot.com/2007/04/javas-utf-8-and-unicode-writing-is.html

Since Java 7 you can do the same with Files.newBufferedWriter a little more succinctly:

Path logFile = Paths.get("/tmp/example.txt");
try (BufferedWriter writer = Files.newBufferedWriter(logFile, StandardCharsets.UTF_8)) {
    writer.write("Hello World!");
    // ...
}

var out = new java.io.PrintWriter(new java.io.File(path), "UTF-8");
text = new java.lang.String( src || "" );
out.print(text);
out.flush();
out.close();

The Java 7 Files utility type is useful for working with files:

import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.io.IOException;
import java.util.*;

public class WriteReadUtf8 {
  public static void main(String[] args) throws IOException {
    List<String> lines = Arrays.asList("These", "are", "lines");

    Path textFile = Paths.get("foo.txt");
    Files.write(textFile, lines, StandardCharsets.UTF_8);

    List<String> read = Files.readAllLines(textFile, StandardCharsets.UTF_8);

    System.out.println(lines.equals(read));
  }
}

The Java 8 version allows you to omit the Charset argument - the methods default to UTF-8.

we can write the UTF-8 encoded file with java using use PrintWriter to write UTF-8 encoded xml
Or Click here

PrintWriter out1 = new PrintWriter(new File("C:\\abc.xml"), "UTF-8");

Below sample code can read file line by line and write new file in UTF-8 format. Also, i am explicitly specifying Cp1252 encoding.

    public static void main(String args[]) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(
            new FileInputStream("c:\\filenonUTF.txt"),
            "Cp1252"));
    String line;
    Writer out = new BufferedWriter(
            new OutputStreamWriter(new FileOutputStream(
                    "c:\\fileUTF.txt"), "UTF-8"));
    try {
        while ((line = br.readLine()) != null) {
            out.write(line);
            out.write("\n");
        }
    } finally {
        br.close();
        out.close();
    }
}

原文出處：How to write a UTF-8 file with Java? - Stack Overflow

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冷日
(冷日) 發表時間：2019/4/5 14:57

Webmaster

註冊日: 2008/2/19
來自:
發表數: 15771

[轉貼]Java FileWriter 類

Java FileWriter類

這個類繼承自的OutputStreamWriter類。這個類是用於寫入字符流。

這個類有幾個構造函數來創建所需的對象。

下面的語法創建一個給定的文件對象文件字符寫對象。


FileWriter(File file)

下面的語法創建一個給定的文件對象文件字符寫對象。


FileWriter(File file, boolean append)

以下語法創建了一個文件描述符關聯的文件字符寫的對象。


FileWriter(FileDescriptor fd)

下面的語法創建給定文件名的文件字符寫對象。


FileWriter(String fileName)

下面的語法創建一個文件字符寫對象給出一個布爾值，指示是否附加寫入數據的文件名。


FileWriter(String fileName, boolean append)

一旦有文件字符寫對象，再有就是使用helper方法的列表，它可以用來操作文件。

SN	方法及描述
1	public void write(int c) throws IOException 寫入單個字符。
2	public void write(char [] c, int offset, int len) 寫入字符數組的偏離，len長度開始的部分。
3	public void write(String s, int offset, int len) 寫一個字符串的一部分從偏移和len長度開始。

例子：

下面的例子是用來演示：


import java.io.*;
public class FileRead{
   public static void main(String args[])throws IOException{
      File file = new File("Hello1.txt");
      // creates the file
      file.createNewFile();
      // creates a FileWriter Object
      FileWriter writer = new FileWriter(file);
      // Writes the content to the file
      writer.write("This
 is
 an
 example
");
      writer.flush();
      writer.close();
      //Creates a FileReader Object
      FileReader fr = new FileReader(file);
      char [] a = new char[50];
      fr.read(a); // reads the content to the array
      for(char c : a)
          System.out.print(c); //prints the characters one by one
      fr.close();
   }
}

這將產生以下結果：


This
is
an
example

原文出處：Java FileWriter類 - Java基礎教程

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冷日
(冷日) 發表時間：2019/4/5 15:00

Webmaster

註冊日: 2008/2/19
來自:
發表數: 15771

[轉貼]Appending to file in utf8

Appending to file in utf8

For a project I need to append to a textfile using UTF-8 encoding. During my research I found two possibilities:

BufferedWriter out = new BufferedWriter(
    new OutputStreamWriter(new FileOutputStream("file.txt), "UTF-8")
)

This will write to my file in UTF-8, but it will overwrite it, rather than append to it if it already exist.
Then I found the code to apend to an existing file with a parameter in the FileWriter, but this will not use UTF-8 explicitely, rather than use the default system character set:

BufferedWriter out = new BufferedWriter(new FileWriter("myfile.txt", true))

I now need the possibility to define BOTH the encoding as well as appending to a file. Just rely on the system encoding or change this is not an option.

You forgot to add the true paramter to the FileOutputStream constructor:

BufferedWriter out = new BufferedWriter(
    new OutputStreamWriter(
        new FileOutputStream("file.txt", true), // true to append
        StandardCharsets.UTF_8                  // Set encoding
    )
);

try {
    BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("myFile.txt", true), "UTF-8"));
    out.write("Hello World");
    out.close();
} catch (IOException e) {
    e.printStackTrace();
}

原文出處java - Appending to file in utf8 - Stack Overflow

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Java FileWriter類

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