java - 从 .txt 文件中获取特定文本

Question

我想从脚本中获取信息，所以我使用了这个函数

public static HashMap<String, String> getEnvVariables(String scriptFile,String config) {
    HashMap<String, String> vars = new HashMap<String, String>();
    try {

        FileInputStream fstream = new FileInputStream(scriptFile);
        BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
        String strLine;
                          String var= "if [ \"$1\" = \""+config +"\" ] ; then";
        // Read File Line By Line
        while ((strLine = br.readLine()) != null) {
            // use a Scanner to parse the content of each line
            // exclude concatenated variables (export xx:$xx)
            if (strLine.startsWith("export") && !strLine.contains("$")) {
                strLine = strLine.substring(7);
                Scanner scanner = new Scanner(strLine);
                scanner.useDelimiter("=");
                if (scanner.hasNext()) {
                    String name = scanner.next();
                    String value = scanner.next();
                    System.out.println(name+"="+value);
                    vars.put(name, value);
                }
            }
        }

但是我想从一个特定的行开始阅读

if [ \"$1\" = \""+config +"\" ] ; then

问题是，当一行以空格开始时，程序认为文件已经结束!那么我该如何修复它并使程序解析到文件末尾呢？考虑到该行可能以不止一个空格开头谢谢

Answer 1

您可以尝试删除每一行中不相关的空格吗？

while ((strLine = br.readLine().trim()) != null) {...}

编辑:不要那样做(感谢 Joop Eggen!)，否则你会有一个不错的 NPE...)。尝试:

while ((strLine = br.readLine()) != null) {
    strLine = strLine.trim();
    ...
}