JAVA在页面查看或下载服务器上的日志

1.配置

FileUtils类所需jar包的maven地址

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<dependency>     <groupId>commons-io</groupId>     <artifactId>commons-io</artifactId>     <version>2.2</version> </dependency>

2.代码

参数为日志文件的相对路径

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package com.example.demo.io;   import org.apache.commons.io.FileUtils; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpStatus; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping;   import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.net.URLEncoder;   /**  * @author Sue  * @create 2019-05-08 10:03  **/ @Controller public class LogUtil {     /**      * 读取txt文件的内容      *      * @param file 想要读取的文件对象      * @return 返回文件内容      */     public static String txt2String(File file) {         StringBuilder result = new StringBuilder();         try {             //构造一个BufferedReader类来读取文件             BufferedReader br = new BufferedReader(new FileReader(file));             String s = null;             //使用readLine方法，一次读一行             while ((s = br.readLine()) != null) {                 result.append(System.lineSeparator() + s);             }             br.close();         } catch (Exception e) {             e.printStackTrace();         }         return result.toString();     }       @GetMapping("/getLog")     public void main(HttpServletRequest request, HttpServletResponse response,String theFileName) {         String property = System.getProperty("user.dir");         String absolutePath = property + File.separator + theFileName;         File file = new File(absolutePath);   //        File file = new File("D:\\logback.2019-04-29.log");         System.out.println(txt2String(file) + ">");         try {             response.getWriter().write(txt2String(file));         } catch (IOException e) {             e.printStackTrace();         }     }       @GetMapping("/download")     public ResponseEntity<byte[]> downLoad(HttpServletRequest request,String theFileName) throws Exception, FileNotFoundException {         HttpHeaders headers = new HttpHeaders();         String property = System.getProperty("user.dir");         String absolutePath = property + File.separator + theFileName;         File file = new File(absolutePath); //        File file = new File("D:\\logback.2019-04-29.log");         String fileName = file.getName();         if (file.exists()) {             //下载显示的文件名，解决中文名称乱码问题             String userAgent = request.getHeader("user-agent").toLowerCase();             String downloadFielName;               if (userAgent.contains("msie") || userAgent.contains("like gecko")) {                 downloadFielName = URLEncoder.encode((fileName), "UTF-8");             } else {                 downloadFielName = new String((fileName).getBytes("UTF-8"), "iso-8859-1");             }             headers.set(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + downloadFielName);             headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);           } else {             throw new FileNotFoundException("文件不存在");         }         return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.OK);         } }