Java(springboot) 读取txt文本内容代码实例

这篇文章主要介绍了Java(springboot) 读取txt文本内容代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

代码如下

public class TxtTest {
  private static final Logger logger = LoggerFactory.getLogger(TxtTest.class);
  public static String readTxt(File file) throws IOException {
    String s = "";
    InputStreamReader in = new InputStreamReader(new FileInputStream(file),"UTF-8");
    BufferedReader br = new BufferedReader(in);
    StringBuffer content = new StringBuffer();
    while ((s=br.readLine())!=null){
      content = content.append(s);
    }
    return content.toString();
  }
 
  public static void main(String[] args) {
    try {
　　　　　　　　//通过绝对路径获取文件
      String s1 = TxtTest.readTxt(new File("C:\Users\....\du.txt"));
      logger.info(s1);
 
　　　　　　　　//spring boot中文件直接放在resources目录下
      String s2 = TxtTest.readTxt(ResourceUtils.getFile("classpath:du.txt"));
      logger.info(s2);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

 以上代码如果部署在linux服务器上，就找不到SpringBoot项目resources根目录下的du.txt文件。所以需要修改成如下方式：

import com.huixiaoer.joy.api.common.config.EnvConfig;
import com.huixiaoer.joy.api.service.FileService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.ClassPathResource;
import org.springframework.stereotype.Service;
import org.springframework.util.ResourceUtils;

import java.io.*;


@Slf4j
@Service
public class FileServiceImpl implements FileService {

    @Override
    public String readTxtFile() {
        try {
            byte[] bytes;

            ClassPathResource classPathResource = new ClassPathResource("file/du.txt");
            //获取文件流
            InputStream keyStream = classPathResource.getInputStream();
            bytes = IOUtils.toByteArray(keyStream);
            keyStream.read(bytes);
            keyStream.close();

            ByteArrayInputStream certBis = new ByteArrayInputStream(bytes);
            InputStreamReader input = new InputStreamReader(certBis);
            BufferedReader bf = new BufferedReader(input);
            String line = null;
            StringBuilder sb = new StringBuilder();
            while((line=bf.readLine()) != null){
                sb.append(line);
            }

            return sb.toString();
        } catch (IOException e) {
            log.error("读取文件错误",e);
        }
        return "";
    }

}

转载于：https://www.jb51.net/article/180411.htm