文件操作是网站编程的重要内容之一,asp关于文件操作讨论的已经很多了,让我们来看看jsp中是如何实现的。 这里用到了两个文件,一个jsp文件一个javabean文件,通过jsp中调用javabean可以轻松读取文本文件,注意请放置一个文本文件afile.txt到web根目录的test目录下,javabean文件编译后将class文件放到对应的class目录下(tomcat环境)。 Read.jsp <%--调用javabean --%> 文件内容: //DelimitedDataFile.java bean文件源代码 //导入java包 import java.io.*; import java.util.StringTokenizer; public class DelimitedDataFile { private String currentRecord = null; private BufferedReader file; private String path; private StringTokenizer token; //创建文件对象 public DelimitedDataFile() { file = new BufferedReader(new InputStreamReader(System.in),1); } public DelimitedDataFile(String filePath) throws FileNotFoundException { path = filePath; file = new BufferedReader(new FileReader(path)); } //设置文件路径 public void setPath(String filePath) { path = filePath; try { file = new BufferedReader(new FileReader(path)); } catch (FileNotFoundException e) { System.out.println("file not found"); } } //得到文件路径 public String getPath() { return path; } //关闭文件 public void fileClose() throws IOException { file.close(); } //读取下一行记录,若没有则返回-1 public int nextRecord() { int returnInt = -1; try { currentRecord = file.readLine(); } catch (IOException e) { System.out.println("readLine problem, terminating."); } if (currentRecord == null) returnInt = -1; else { token = new StringTokenizer(currentRecord); returnInt = token.countTokens(); } return returnInt; } //以字符串的形式返回整个记录 public String returnRecord() { return currentRecord; } } |
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