如何从Apex导出CSV格式的数据？

List<Account> accounts = [SELECT Id, Name, Industry FROM Account];

StringBuilder csvContent = new StringBuilder();
csvContent.append('Id,Name,Industry\n'); // 添加CSV文件的标题行

for(Account acc : accounts) {
    csvContent.append(acc.Id).append(',');
    csvContent.append(acc.Name).append(',');
    csvContent.append(acc.Industry).append('\n');
}

String csvFileName = 'exported_data.csv';
String csvFileBody = csvContent.toString();

Blob csvBlob = Blob.valueOf(csvFileBody);
FileSystem.File file = new FileSystem.File(csvFileName, 'csv');
file.create();
file.write(csvBlob);
file.close();

PageReference downloadLink = Page.ExportDataPage;
downloadLink.getParameters().put('filename', csvFileName);