Quotes appearing on CSV after concatnate fields using Groovy

问题

I'm using groovy to concatenate two fields in CSV It's working ok except that the concatenated field is appearing with quotes.

Is there any way to resolve this?

      ant.mkdir(dir:"target")

  new File("target/UpsertCheckDeals.csv").withWriter {
    new File("C:/Users/alon/Documents/CheckDealReadyForConcat.csv").splitEachLine(",") {Customer__c,Name__c,Deal__c,Check_Count__c ->
    it.println "${Customer__c},${Deal__c},${Deal_Source__c},${Salesperson_Name__c},${Customer__c}-${Deal__c}"

回答1:

CSV is a more complicated file format than it would first appear. Fields can be optionally quoted which is what appears to be your problem.

Most programming languages have a library that will parse CSV. In the case of groovy I'd recommend opencsv

http://opencsv.sourceforge.net/

The following example extends the example I created for your previous question.

Example

├── build.xml
├── src
│   └── file1.csv
└── target
    └── file1.csv

src/file1.csv

"customer",deal
"200000042",23
"200000042",34
"200000042",35
"200000042",65

target/file1.csv

customer,deal,customer-deal
200000042,23,200000042-23
200000042,34,200000042-34
200000042,35,200000042-35
200000042,65,200000042-65

build.xml

<project name="demo" default="build" xmlns:ivy="antlib:org.apache.ivy.ant">

  <available classname="org.apache.ivy.Main" property="ivy.installed"/>

  <target name="build" depends="resolve">
    <taskdef name="groovy" classname="org.codehaus.groovy.ant.Groovy" classpathref="build.path"/>

    <groovy>
      import com.opencsv.CSVReader

      ant.mkdir(dir:"target")

      new File("target/file1.csv").withWriter { writer ->
        new File("src/file1.csv").withReader { reader ->
          CSVReader csv = new CSVReader(reader);

          csv.iterator().each { row ->
            if (row.size() == 2) {
              writer.println "${row[0]},${row[1]},${row[0]}-${row[1]}"
            }
          }
        }
      }
    </groovy>
  </target>

  <target name="resolve" depends="install-ivy"> 
    <ivy:cachepath pathid="build.path">
      <dependency org="org.codehaus.groovy" name="groovy-all" rev="2.4.7" conf="default"/>
      <dependency org="com.opencsv" name="opencsv" rev="3.8" conf="default"/>
    </ivy:cachepath>
  </target>

  <target name="install-ivy" unless="ivy.installed">
    <mkdir dir="${user.home}/.ant/lib"/>
    <get dest="${user.home}/.ant/lib/ivy.jar" src="http://search.maven.org/remotecontent?filepath=org/apache/ivy/ivy/2.4.0/ivy-2.4.0.jar"/>
    <fail message="Ivy has been installed. Run the build again"/>
  </target>

</project>

Notes:

• Uses apache ivy to managed dependencies like groovy and opencsv
• I included a test "row.size() == 2" to prevent empty rows throwing errors

来源：https://stackoverflow.com/questions/41407444/quotes-appearing-on-csv-after-concatnate-fields-using-groovy