JSP的常见文件操作

String path=request.getRealPath("/");//传递参数"/"可以返回web应用根目录String tmp_path=path+"tmp";File f1=new File(tmp_path);//创建FILE类,指定路径为tmp_pathf1.mkdir();//创建目录File f2=new File(tmp_path,"a.txt");//创建FILE类,指定路径为//tmp_path+"a.txt"f2.createNewFile();//创建f2指定的文件File f3=new File(tmp_path,"b.txt");f3.createNewFile();File f4=new File(tmp_path,"b.txt");f4.createNewFile();

String path=request.getRealPath("/");File fp=new File(path,"file1.txt");//定义一个文件FileInputStream fistream=new FileInputStream(fp);//定义一个文件输入流绑定一个文件byte buf[]=new byte[10000];int bytesum=fistream.read(buf,0,10000)//把字节文件写入到buf数组中,返回写入的字节数String str_file=new String(buf,0,bytesum);out.println(str_file);fistream.close();

String path=request.getRealPath("/");File fp=new File(path,"file1.txt");FileReader freader=new FileReader(fp):BufferedReader bfdreader=new BufferedReader(freader);String str_line=bfdreader.readLine();while(str_line!=null){  out.println(str_line);  out.println("<br>");  str_line=bfdreader.readLine(); } bfdreader.close(); freader.close();

String path=request.getRealPath("/");File fp=new File(path,"file2.txt");FileWriter fwriter=new FileWriter(fp);request.setCharacterEncoding("GBK");//设置字符编码String str_file=request.getParameter("textarea");fwriter.write(str_file);fwriter.close();

String path=request.getRealPath("/");File fp=new FIle(path,"file2.txt");FileWriter fwriter=new FIleWriter(fp);BufferedWriter bfwriter=new BufferedWriter(fwriter);request.setCharacterEncoding("GBK");String str_file=request.getParameter("textarea");bfwriter.write(str_file,0,str_file.length());bfwriter.flush();bfwriter.close();