Java讀取介面中的資料,並儲存到txt檔案中!
阿新 • • 發佈:2020-09-12
//建立讀取介面中資料的方法
public static String read() {
URL url = null;
BufferedReader reader = null;
HttpURLConnection connection = null;
InputStreamReader ins = null;
try {
// 設定url地址
url = new URL("https://***.***.com/api/getStudent");
System.out.println("已完成20%。。。");
// 獲取連線通道
connection = (HttpURLConnection) url.openConnection();
// 設定連線響應時間
connection.setConnectTimeout(2 * 1000);
// 設定讀取響應時間
connection.setReadTimeout(2 * 1000);
// 連線
connection.connect();
System.out.println("已完成50%。。。");
// 輸入流
ins = new InputStreamReader(connection.getInputStream(), "UTF-8");
// 讀取
reader = new BufferedReader(ins);
// 建立可變字串
StringBuffer sb = new StringBuffer();
System.out.println("已完成80%。。。");
String line;
// readLine()方法,當讀取流讀取資料時使用,當讀到\n、\r時,會跟著換行,
// 同時會以字串的形式返回這一行,當讀取完所有資料時,會返回null
while ((line = reader.readLine()) != null) {
System.out.println("匯入中。。。");
sb.append(line + "\n");
}
return sb.toString();
} catch (IOException e) {
// TODO Auto-generated catch block
System.out.println("Error GetURL:" + e);
System.out.println("Error GetURL:" + url);
e.printStackTrace();
} finally {
if (ins != null) {
try {
ins.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (connection != null) {
connection.disconnect();
}
}
return null;
}
//寫檔案處理
public static void main(String[] args) {
System.out.println("匯入開始!");
File file = new File("F:/love.txt");
if(file.exists()) {
System.err.println("F盤下已存在love.txt的檔案,將更新檔案內容");
file.delete();
}
if(!file.exists()) {
try {
file.createNewFile();
OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(file),"GB2312");
BufferedWriter bw = new BufferedWriter(osw);
bw.write(read());
System.out.println("已完成100%");
System.out.println("匯入結束!");
bw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
原文:https://www.cnblogs.com/wjup/p/10576109.html