JAVA在页面查看或下载服务器上的日志

喜欢ヅ旅行 2021-12-22 10:59 222阅读 0赞

### 1.配置 ###

FileUtils类所需jar包的maven地址

<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

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);
    
    
        }
    }

转载于:https://www.cnblogs.com/sueyyyy/p/10831773.html