将部分txt文件分配给java变量

Question

我有一个带有以下输出的 txt 文件：

"CN=COUD111255,OU=Workstations,OU=Mis,OU=Accounts,DC=FLHOSP,DC=NET"

我要做的是读取 COUD111255 部分并将其分配给 java 变量。我将 ldap 分配给 sCurrentLine，但我得到一个空点异常。任何建议。

try (BufferedReader br = new BufferedReader(new FileReader("resultofbatch.txt")))
            {


                final Pattern PATTERN = Pattern.compile("CN=([^,]+).*");
                try {
                    while ((sCurrentLine = br.readLine()) != null) {
                        //Write the function you want to do, here.
                        String[] tokens = PATTERN.split(","); //This will return you a array, containing the string array splitted by what you write inside it.
                        //should be in your case the split, since they are seperated by ","

                    }
                     System.out.println(sCurrentLine);
                } catch (IOException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
                } catch (IOException e2) {
                    // TODO Auto-generated catch block
                    e2.printStackTrace();
                }

        }
    });

Answer 1

您只需要逐行从文件中读取数据并将该行分配给您的变量 str。参考以下链接： How to read a large text file line by line using Java?

Answer 2

您的代码几乎是正确的。您正在将此字符串写入标准输出 - 为什么？如果我没听错的话，你需要的只是：

private static final Pattern PATTERN = Pattern.compile("CN=([^,]+).*");

public static String solve(String str) {
    Matcher matcher = PATTERN.matcher(str);
    if (matcher.matches()) {
        return matcher.group(1);
    } else {
        throw new IllegalArgumentException("Wrong string " + str);
    }
}

这个电话

solve("CN=COUD111255,OU=Workstations,OU=Mis,OU=Accounts,DC=FLHOSP,DC=NET")

给了我“COUD111255”作为答案。

Answer 3

要从 .txt 中读取，请使用 BufferedReader。要创建一个，请编写：

BufferedReader br = new BufferedReader(new FileReader("testing.txt"));

testing.txt 是您正在阅读的 txt 的名称，并且必须在您的 java 文件中。初始化后，你必须继续：

while ((CurrentLine = br.readLine()) != null) {
                //Write the function you want to do, here.
                String[] tokens = CurrentLine.split(","); //This will return you a array, containing the string array splitted by what you write inside it.
                //should be in your case the split, since they are seperated by ","
            }

您获得了令牌数组，即 = [CN=COUD111255,OU=Workstations OU=Mis,OU=Accounts,DC=FLHOSP,DC=NET]。 所以，现在取数组的第 0 个元素并利用它。你得到了 CN=COUD111255，现在！离开这里不是为了给出完整的代码。

希望有帮助！