Java Web 服务和 vector

Question

我想要一些关于我写的网络服务的建议，基本上是试图用代码实现一个方法......

public static void writeToCustomerFile(Vector<Customer> customer) throws IOException
{
    String strFilePath = "./src/customer.txt";
    BufferedWriter writer = new BufferedWriter(new FileWriter(strFilePath));
    for (int i = 0; i < customer.size(); i++) {
        writer.write("id," + customer.get(i).getName() + "," + customer.get(i).getSurname()+","+customer.get(i).getAccount()+","+customer.get(i).getBalance()+"\n");
    }
    writer.close();
}

但它不断给出错误消息:类型非法开始。

我尝试使用 vector 将其写入服务器端的文件

祝福弗雷德里克·卡特

Answer 1

您是否导入了Vector类？

import java.util.Vector;

顺便说一句，Vector 是一个旧的遗留集合类。您应该在新代码中使用 List 和 ArrayList - 仅当您处理无法更改的旧遗留代码时才使用 Vector。

import java.util.List;

public static void writeToCustomerFile(List<Customer> customers) throws IOException
{
    // ... code here ...
}

要迭代列表，请使用“foreach”样式循环，而不是按索引显式查找元素:

for (Customer cust : customers) {
    writer.write("id," + cust.getName() + "," + cust.getSurname() + "," +
        cust.getAccount() + "," + cust.getBalance() + "\n");
}