java 写文件

FileName为要写入的文件路径
AppendString为要写入文件的string
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 public static void AppendFile(String FileName,String AppendString){
  BufferedReader reader = null;
  try {
   reader = new BufferedReader(new InputStreamReader(new FileInputStream(SysConfig.STATIC_INSTALLDATABASEINFO_PATH)));
  } catch (FileNotFoundException e1) {
   e1.printStackTrace();
  }
  StringBuffer buffer = new StringBuffer();
  String line=null;
  try {
   line = reader.readLine();
   while (line != null) {         
             buffer.append(line);       
             buffer.append("\n");       
             line = reader.readLine();  
         }
  } catch (IOException e1) {
   e1.printStackTrace();
  }     
       
  BufferedWriter wr1;
  try {
   wr1 = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(FileName)));
   try {
    wr1.append(buffer);
    wr1.append(AppendString);
    wr1.newLine();
    wr1.flush();
    wr1.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
 }
 public static void WriteFile(String FileName,String WriteString){
  BufferedWriter wr1;
  try {
   wr1 = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(FileName)));
   try {
    wr1.append(WriteString);
    wr1.newLine();
    wr1.flush();
    wr1.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
 }