示例：Servlet读取文件内容并在页面打印输出

 1 package com.mhb;
 2
 3 import java.io.BufferedReader;
 4 import java.io.File;
 5 import java.io.FileReader;
 6 import java.io.IOException;
 7 import java.io.PrintWriter;
 8
 9 import javax.servlet.ServletException;
10 import javax.servlet.http.HttpServlet;
11 import javax.servlet.http.HttpServletRequest;
12 import javax.servlet.http.HttpServletResponse;
13
14 public class FileRead extends HttpServlet {
15
16 public void init() throws ServletException {
17 }
18
19 public void doGet(HttpServletRequest request, HttpServletResponse response)
20 throws ServletException, IOException {
21 response.setContentType("text/html");     //设置响应内容格式
22 response.setCharacterEncoding("gb2312");    //设置响应内容编码
23 PrintWriter out = response.getWriter();     //获得out对象
24 String fileName = "content.txt";     //指定文件名称
25 String realPath = request.getRealPath(fileName);
26
27 File file = new File(realPath);
28
29 if(file.exists()){
30 FileReader reader = new FileReader(file);    //获得输入流
31 BufferedReader bufferReader = new BufferedReader(reader); //使用缓冲流
32 String line = null;     //每行数据
33 while ((line = bufferReader.readLine()) != null){    //循环读取
34 out.print(line +"<br />");     //输出文件内容
35 }
36 }else{
37 out.print("文件不存在！");
38 }
39
40 }
41
42 public void doPost(HttpServletRequest request, HttpServletResponse response)
43 throws ServletException, IOException {
44 }
45
46 public void destroy() {
47 super.destroy();
48 }
49 }

文本文件：content.txt内容

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