用Springboot实现文件下载功能

 1 ApiOperation(value = "下载文件", httpMethod = "GET", notes = "downloadFile", response = String.class)
 2     public String downloadFile(HttpServletRequest request, HttpServletResponse response) {
 3        String fileName = "zabbix.txt";// 设置文件名
 4             if (fileName != null) {
 5                 //设置文件路径
 6                // String realPath = "D://zabbix_agentd.conf";
 7                 String realPath = "D:" + File.separator + "zabbix_agentd.conf";
 8                 File file = new File(realPath , fileName);
 9                 if (file.exists()) {
10                     response.setContentType("application/force-download");// 设置强制下载不打开
11                     response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);// 设置文件名
12                     byte[] buffer = new byte[1024];
13                     FileInputStream fis = null;
14                     BufferedInputStream bis = null;
15                     try {
16                         fis = new FileInputStream(file);
17                         bis = new BufferedInputStream(fis);
18                         OutputStream os = response.getOutputStream();
19                         int i = bis.read(buffer);
20                         while (i != -1) {
21                             os.write(buffer, 0, i);
22                             i = bis.read(buffer);
23                         }
24                         System.out.println("success");
25                         
26                         InetAddress addr = InetAddress.getLocalHost();  
27                         String ip=addr.getHostAddress(); //获取本机ip
28                         replacTextContent(ip);
29                     } catch (Exception e) {
30                         e.printStackTrace();
31                     } finally {
32                         if (bis != null) {
33                             try {
34                                 bis.close();
35                             } catch (IOException e) {
36                                 e.printStackTrace();
37                             }
38                         }
39                         if (fis != null) {
40                             try {
41                                 fis.close();
42                             } catch (IOException e) {
43                                 e.printStackTrace();
44                             }
45                         }
46                     }
47                 }
48             }
49             return null;
50     }
51     /**
52      * 替换文本文件中的 指定字符串
53      * @param path
54      * @throws IOException
55      */
56     public void replacTextContent(String ip){
57         try {
58             File file = new File("D:zabbix_agentd.conf");
59             String content = FileUtils.readFileToString(file, "utf-8");
60             //原有的内容
61             String srcStr = "Hostname=192.168.1.177";        
62             //要替换的内容
63             String replaceStr ="Hostname"+ ip;     
64             // 读  
65             FileReader in = new FileReader(content);  
66             BufferedReader bufIn = new BufferedReader(in);  
67             // 内存流, 作为临时流  
68             CharArrayWriter  tempStream = new CharArrayWriter();  
69             // 替换  
70             String line = null;  
71             while ( (line = bufIn.readLine()) != null) {  
72                 // 替换每行中, 符合条件的字符串  
73                 line = line.replaceAll(srcStr, replaceStr);  
74                 // 将该行写入内存  
75                 tempStream.write(line);  
76                 // 添加换行符  
77                 tempStream.append(System.getProperty("line.separator"));  
78             }  
79             // 关闭 输入流  
80             bufIn.close();  
81             // 将内存中的流 写入 文件  
82             FileWriter out = new FileWriter(file);  
83             tempStream.writeTo(out);  
84             out.close();  
85         }catch (Exception e) {
86             e.printStackTrace();
87         }
88     }