Java读取文本文件内容

方法1

纯原生方法，通过BufferedReader类读取：

public static String read1(InputStream inputStream) throws IOException {
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
    StringBuffer sb = new StringBuffer();
    String line = bufferedReader.readLine();
    while (line != null) {
        sb.append(line).append("\n");
        line = bufferedReader.readLine();
    }
    return sb.toString();
}

方法2

使用IOUtils工具类，在pom.xml文件中引入依赖：

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

读取文件内容方法封装：

public static String read2(InputStream inputStream) throws IOException {
    List<String> lines = org.apache.commons.io.IOUtils.readLines(inputStream);
    return String.join("\n", lines);
}