属性

方法

获取根目录

request.getServletContext().getRealPath("/");

创建目录

File file= new File(path);

if(!file.exists()){

file.mkdirs();

}

写文件

File file =new File("文件路径");

OutputStreamWriter osw =new OutputStreamWriter(new FileOutputStream(file,"是否追加"),"字符编码");

osw.write("写入内容");

osw.flush();

osw.close();

读文件

File file =new File("文件路径");

InputStreamReader isr=new InputStreamReader(new FileInputStream(file),"字符编码");

StringBuider sb= new StringBuider();

while(isr.ready()){

sb.append((char)isr.read());

}

isr.close();

删除文件

File file =new File("path");//有没有引号

file.delete();

静态化技术

URL url =new URL ("htpp://www.rsseasy.com");

HttpURLConnection connection =(HttpURLConnection)url.openConnection();

BufferedReader in =new BufferedReader(new InputStreanReader(connection.getInputStream(),"utf-8"));

StringBuffer buffer =new StringBuffer();

String line = "";

while((line=in.readLine())!=null){

buffer.append(line);

}

File file =new File("path");

OutputStreamWrite osw =new OutputStreamWrite(new FileOutputStream(file,file),"utf-8");

osw.write(buffer.toString());

osw.flush();

osw.close();