Question

全新的Groovy和Java。

我有一个大的制表符分隔文本文件。

我需要能够“测试”文本文件的每一行，以确保某些列具有正确的数据。

例如，

column 2 should only have the term 'New Customer'
column 14 should only have the term 'Dog' or 'Cat'

如果任何比较失败，则打印错误的术语。

package TestImport

import java.io.BufferedReader;
import java.io.FileReader;

public class PreValidateData {

    public static void main(String args[]) throws Exception {

        String dataFileName = "C:/Users/BigDaddy/Desktop/test.csv"
        BufferedReader bReader = new BufferedReader(new FileReader(dataFileName));
        String line;

        while (line = bReader.readLine()) {

            //Not sure what to put here.  This doesn't work
            String datavalue[] = line.split("\t");
            String value2 = datavalue[1];
            String value14 = datavalue[13];

            if(value2 != "New Customer"){
                Println("FAILURE: line:" + value2.linenumber + "in column 2 is not New Customer.  but = " + datavalue[2])
            }

            if(value14 != "Ndog" or "cat){
                Println("FAILURE: line:" + value14.linenumber + "in column 14 is not cat or dog.  but = " + term)
            }

        }
        bReader.close();
    }
}

我不确定从哪里开始。有什么建议吗？

Answer 1

请使用Groovy执行此操作。用Java写这个是浪费击键。

示例：

def file = new File("C:/Users/BigDaddy/Desktop/test.csv")
def lineCount = 0
file.eachLine { line ->
    def parts = line.split '\t'
    assert parts.size() > 13
    if ( parts[ 1 ] != 'New Customer' )
       System.err.println "Failure! Line $lineCount in column 2..."
    if ( ! ( parts[ 13 ] in [ 'dog', 'cat' ] ) )
       System.err.println "Failure! Line $lineCount in column 14..."
    lineCount++
}

运行速度几乎与Java一样快，但写入/读取效果更好。

Answer 2

您的语法很接近，您可以使用try-with-resources，我会使用格式化的io（printf）。像，

try (BufferedReader bReader = new BufferedReader(new FileReader(
        dataFileName))) {
    String line;
    int lineNumber = 0;
    while ((line = bReader.readLine()) != null) {
        lineNumber++;
        String datavalue[] = line.split("\t");
        String value2 = datavalue[1];
        String value14 = datavalue[13];

        if (!value2.equals("New Customer")) {
            System.err.printf("FAILURE: line: %d in column 2 is "
                    + "%s not 'New Customer'.%n", lineNumber, value2);
        }
        if (!(value14.equals("dog") || value14.equals("cat"))) {
            System.err.printf("FAILURE: line: %d in column 14 is "
                    + "%s not 'dog' or 'cat'.%n", lineNumber, value14);
        }
    }
} catch (Exception e) {
    e.printStackTrace();
}

Groovy或Java来解析文本文件并进行比较

2 个答案: