Java编程知识点总结[2]

6. 创建记事本保存临时答案文件

           // 创建文件对象
				File file = new File(ServletActionContext.getServletContext()
						.getRealPath("/docs/")+ "/" +   student.getStudentNo() + File.separator + tempTxt);
				if (file.exists())
 {
					BufferedReader br = new BufferedReader(new FileReader(file)); // 创建读取流
					String temp = br.readLine();// 读取数据
					String line;
					while ((line = br.readLine()) != null) {
						temp += ";" + line;
					}
					if (temp == null) {
					} else {
						// 向服务器写一个txt
						PrintWriter pw = new PrintWriter(new FileWriter(
								ServletActionContext.getServletContext()
										.getRealPath("/docs/")
										+ "/" + student.getStudentNo() + File.separator + tempTxt));
						pw.print(temp + answerStr);
						answerResult = temp + answerStr;
						pw.close();
					}
					br.close();
				} else {
					// 向服务器写一个txt
					PrintWriter pw = new PrintWriter(new FileWriter(
							ServletActionContext.getServletContext()
									.getRealPath("/docs/")
									+ "/" + student.getStudentNo() + File.separator + tempTxt));
					pw.print(answerStr);
					answerResult = answerStr;
					pw.close();
				}