编程相对较新。我想读取一个URL,修改文本字符串,然后将其写入行分隔的csv文本文件。Java - 将字符串逐行写入文件vs单行/无法将字符串转换为字符串[]
阅读&修改部件运行。另外,输出字符串到终端(使用Eclipse)看起来很好(csv,逐行),像这样;
data_a,data_b,data_c,...
data_a1,data_b1,datac1...
data_a2,data_b2,datac2...
.
.
.
但我不能写同一个字符串的文件 - 它只是变成一个班轮(见下面我的for循环,尝试没有1 & 2);
data_a,data_b,data_c,data_a1,data_b1,datac1,data_a2,data_b2,datac2...
我想我正在寻找一种方式,在FileWriter的或循环的BufferedWriter,串finalDataA转换为字符串数组(即包含字符串后缀“[0]”),但我还没有找到这种方法不会给出“不能将字符串转换为字符串[]”类型的错误。有什么建议么?
String data = "";
String dataHelper = "";
try {
URL myURL = new URL(url);
HttpURLConnection myConnection = (HttpURLConnection) myURL.openConnection();
if (myConnection.getResponseCode() == URLStatus.HTTP_OK.getStatusCode()) {
BufferedReader in = new BufferedReader(new InputStreamReader(myConnection.getInputStream()));
while ((data = in.readLine()) != null) {
dataHelper = dataHelper + "\n" + data;
}
in.close();
String trimmedData = dataHelper.trim().replaceAll(" +", ",");
String parts[] = trimmedData.split(Pattern.quote(")"));// ,1.,");
String dataA = parts[1];
String finalDataA[] = dataA.split("</PRE>");
// parts 2&3 removed in this example
// Console output for testing purpose - This prints out many many lines of csv-data
System.out.println(finalDataA[0]);
//This returns the value 1
System.out.println(finalDataA.length);
// Attempt no. 1 to write to file - writes a oneliner
for(int i = 0; i < finalDataA.length; i++) {
try (BufferedWriter bw = new BufferedWriter(new FileWriter(pathA, true))) {
String s;
s = finalDataA[i];
bw.write(s);
bw.newLine();
bw.flush();
}
}
// Attempt no. 2 to write to file - writes a oneliner
FileWriter fw = new FileWriter(pathA);
for (int i = 0; i < finalDataA.length; i++) {
fw.write(finalDataA[i] + "\n");
}
fw.close();
}
} catch (Exception e) {
System.out.println("Exception" +e);
}
这会在每行写入两行结束符。你不需要'write(endOfLineToken)'*和*'newLine()'。 'newLine()'就足够了。 – EJP
@EJP名称endOfLineToken可能会令人困惑,但它应该从使用中显而易见,这不是必需的“\ n”或CR或其他。它应该为未分析数据中的行分隔。 –
这个诀窍 - 非常感谢罗马! –