import java.io.File;  import java.io.IOException;  import java.util.List;    import com.google.common.base.Charsets;  import com.google.common.base.Joiner;  import com.google.common.base.Preconditions;  import com.google.common.collect.Lists;  import com.google.common.io.Files;  import com.google.common.primitives.Bytes;    public class FooUtilsCsvHelper {        // csv's default delemiter is ','      private final static String DEFAULT_DELIMITER = ",";      // Mark a new line      private final static String DEFAULT_END = "\r\n";      // If you do not want a UTF-8 ,just replace the byte array.      private final static byte commonCsvHead[] = { (byte) 0xEF, (byte) 0xBB,              (byte) 0xBF };        /**       * Write source to a csv file       *        * @param source       * @throws IOException       */      public static void writeCsv(List<List<String>> source) throws IOException {          // Aoid java.lang.NullPointerException          Preconditions.checkNotNull(source);          StringBuilder sbBuilder = new StringBuilder();          for (List<String> list : source) {              sbBuilder.append(Joiner.on(DEFAULT_DELIMITER).join(list)).append(                      DEFAULT_END);          }          Files.write(Bytes.concat(commonCsvHead,                  sbBuilder.toString().getBytes(Charsets.UTF_8.toString())),                  new File("d:\\/123.csv"));      }        /**       * Simple read a csv file       *        * @param file       * @throws IOException       */      public static void readCsv(File file) throws IOException {          System.out.println(Files.readFirstLine(file, Charsets.UTF_8));      }        // Run a small test yourself.      public static void main(String[] args) throws IOException {          List<List<String>> source = Lists.newArrayList();          List<String> tmpL = Lists.newArrayList();          tmpL.add("测试titile1");          tmpL.add("测试titile2");          source.add(tmpL);          writeCsv(source);          readCsv(new File("d:\\/123.csv"));      }  }