Java IOException-流关闭 [英] Java IOException - Stream Closed
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问题描述
运行此程序时,我得到"IOException
:流关闭" .文本包含许多行数据.程序应读取每一行,执行必要的功能,然后将输出写入新文件.我对于应该首先关闭哪个作者以及在哪里关闭感到困惑.
I get "IOException
: Stream Closed" when I run this program. The text contains many lines of data. Program should read each line, do necessary function and write the output to a new file. I am confused as to which writer should be closed first and where.
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)
推荐答案
您在循环中关闭输入流:
You close the input stream in your loop:
while ((inputLine = in.readLine()) != null) // error
// System.out.println(inputLine);
in.close();
您应该在循环外部关闭流:
You should close the stream outside of the loop:
while ((inputLine = in.readLine()) != null) // error
{
//dosomething
// System.out.println(inputLine);
}
in.close();
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