属性类Java

Question

如何使用属性进行while循环我在Iterator上玩了2天，toString解析和其他很多形式就是我要显示的格式。仅适用于一组属性，因此只显示查询中的最后一项。

BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
    String line;
    while((line=in.readLine())!=null){
    System.out.println(line);
    }

以错误的格式显示2套

现在这是完美的格式，但只打印最后一项：

BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
    String line;
   Properties prop= new Properties();
   while((line=in.readLine())!=null){
  prop.load(in);
   String amount = prop.getProperty("ssl_amount");
    String card = prop.getProperty("ssl_card_number");
    String approval = prop.getProperty("ssl_approval_code");
    String results = prop.getProperty("ssl_result_message");
    String time = prop.getProperty("ssl_txn_time");
    System.out.println(amount+" "+card+" "+approval+" "+results+" "+time+" "); 
  }

如何制作循环以正确的格式打印所有条目？ 这是原始输入流：

ssl_txn_count=2
ssl_txn_id=071214A15-B805A410-E9F4-4D6D-AA87-0E9923FBC7FA
ssl_user_id=webpage
ssl_trans_status=STL
ssl_card_type=CREDITCARD
ssl_transaction_type=SALE
ssl_txn_time=12/07/2014 11:28:00 PM
ssl_first_name=
ssl_last_name=
ssl_card_number=41**********1111
ssl_exp_date=1115
ssl_entry_mode=K
ssl_avs_response= 
ssl_cvv2_response=P
ssl_amount=10.00
ssl_invoice_number=
ssl_result_message=APPROVAL
ssl_approval_code=CVI064
ssl_txn_id=061214A15-8921B6B0-FF9E-4DA5-97D1-288C28272B10
ssl_user_id=webpage
ssl_trans_status=STL
ssl_card_type=CREDITCARD
ssl_transaction_type=SALE
ssl_txn_time=12/06/2014 01:25:18 AM
ssl_first_name=
ssl_last_name=
ssl_card_number=41**********1111
ssl_exp_date=1215
 ssl_entry_mode=K
 ssl_avs_response= 
 ssl_cvv2_response=P
 ssl_amount=12.00
 ssl_invoice_number=
 ssl_result_message=APPROVAL
 ssl_approval_code=CVI806

这是我想要的好格式:(就像你只能看到报告1而不是2）

run:
12.00 41**********1111 CVI806 APPROVAL 12/06/2014 01:25:18 AM 
BUILD SUCCESSFUL (total time: 1 second)

Answer 1

加载Reader一次（在循环外），然后您可以迭代keySet。接下来，您可以显示键和值。使用可能类似的Format String Synatx，

try (InputStreamReader is = new InputStreamReader(
        conn.getInputStream(), "UTF-8")) {
    Properties prop = new Properties();
    prop.load(is);
    for (Object key : prop.keySet()) {
        System.out.printf("%s=%s%n", key, prop.get(key));
    }
}

对于硬编码密钥（您的特定情况以及如果您想忽略其他属性），您不需要循环

try (InputStreamReader is = new InputStreamReader(
        conn.getInputStream(), "UTF-8")) {
    Properties prop = new Properties();
    prop.load(is);
    String amount = prop.getProperty("ssl_amount");
    String card = prop.getProperty("ssl_card_number");
    String approval = prop.getProperty("ssl_approval_code");
    String results = prop.getProperty("ssl_result_message");
    String time = prop.getProperty("ssl_txn_time");
    System.out.println(amount + " " + card + " " + approval + " "
            + results + " " + time + " ");
}

以上是使用try-with-resources完成后关闭流。

Answer 2

使用Enumuration迭代属性文件，这是一个示例

Properties prop = new Properties();

InputStream input = nnew FileInputStream("<file-location>.properties");
prop.load(input);
Enumeration<?> e = prop.propertyNames();
while (e.hasMoreElements()) {
        String key = (String) e.nextElement();
        String value = prop.getProperty(key);
        System.out.println("Key : " + key + ", Value : " + value);
    }