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读取一个文件文件内容:第行://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;}}
