java IO 读取文件中文乱码问题

1、JAVA读取文件，避免中文乱码。

/**
* 读取文件内容
*
* @param filePathAndName   String  读取文件路径
* @return String  文件中的内容
*/
public static String readFile(String filePathAndName) {
   String fileContent = "";
   try { 
    File f = new File(filePathAndName);
    if(f.isFile()&&f.exists()){
     InputStreamReader read = new InputStreamReader(new FileInputStream(f),"UTF-8");
     BufferedReader reader=new BufferedReader(read);
     String line;
     while ((line = reader.readLine()) != null) {
      fileContent += line;
     }  
     read.close();
    }
   } catch (Exception e) {
    System.out.println("读取文件内容操作出错");
    e.printStackTrace();
   }
   return fileContent;
}


2、JAVA写入文件，避免中文乱码。
/**
* 写文件
*
* @param filePathAndName   String  写文件路径
* @param fileContent   String  需要写入的内容
*/

public static void writeFile(String filePathAndName, String fileContent) {
   try {
    File f = new File(filePathAndName);
    if (!f.exists()) {
     f.createNewFile();
    }
    OutputStreamWriter write = new OutputStreamWriter(new FileOutputStream(f),"UTF-8");
    BufferedWriter writer=new BufferedWriter(write);  
    //PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter(filePathAndName)));
    //PrintWriter writer = new PrintWriter(new FileWriter(filePathAndName));
    writer.write(fileContent);
    writer.close();
   } catch (Exception e) {
    System.out.println("写文件内容操作出错");
    e.printStackTrace();
   }
}