I get "IOException
:流已关闭”当我运行这个程序时。文本包含许多行数据。程序应该读取每一行,执行必要的功能并将输出写入新文件。我很困惑应该先关闭哪个作家以及在哪里。
import java.net.*;
import java.io.*;
public class URLReader {
public static void main(String[] args) throws Exception {
BufferedReader br = null;
try {
// change this value
FileInputStream fis = new FileInputStream("C:\\Users\\Rao\\Desktop\\test.txt");
br = new BufferedReader(new InputStreamReader(fis, "UTF-8"));
String sCurrentLine;
while ((sCurrentLine = br.readLine()) != null) {
processLine(sCurrentLine); //error
}
} finally {
if (br != null)
br.close();
}
}
public static void processLine(String line) throws IOException {
String prename = line.substring(22);
int siz= prename.indexOf(":");
String name = prename.substring(0, siz);
URL oracle = new URL("http://ip-api.com/json/"+name);
BufferedReader in = new BufferedReader(new InputStreamReader(oracle.openStream()));
String inputLine;
while ((inputLine = in.readLine()) != null) // error
// System.out.println(inputLine);
in.close();
String baby = (line + "\t" + inputLine);
try {
FileWriter writer = new FileWriter("C:\\Users\\Rao\\Desktop\\output.txt", true);
writer.write(baby);
writer.write("\r\n"); // write new line
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
例外情况如下:
Exception in thread "main" java.io.IOException: Stream closed
at java.io.BufferedReader.ensureOpen(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at URLReader.processLine(URLReader.java:31)
at URLReader.main(URLReader.java:13)
您关闭循环中的输入流:
while ((inputLine = in.readLine()) != null) // error
// System.out.println(inputLine);
in.close();
您应该关闭循环外部的流:
while ((inputLine = in.readLine()) != null) // error
{
//dosomething
// System.out.println(inputLine);
}
in.close();
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