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使用此代碼我想要.jar文件讀取位於文件夾數據中的jar文本文件「file.txt」。這是一個用Processing編程的應用程序,所以我想要讀取的所有文件都在數據文件夾中。任何人都可以解釋爲什麼我得到一個NullPointerException?該文件存在幷包含文本。在.jar應用程序中讀取文本文件
import java.io.*;
void setup() {
size(500, 500);
try {
// HERE I TRY TO READ THE FILE WHICH IS LOCATED IN THE JAR FILE IN THE FOLDER "DATA"
InputStream is = getClass().getResourceAsStream("/data/file.txt");
// HERE I GET A NULL-POINTER-EXCEPTION BECAUSE THE FILE CANNOT BE READ (IS = NULL, WHY IS THE INPUT STREAM NULL?)
BufferedReader br = new BufferedReader(new InputStreamReader(is));
// THE FIRST LINE OF THE DOCUMENT IS READ AND PRINTED IN THE CONSOLE
String read = br.readLine();
br.close();
println(read);
}
catch (IOException e) {
// IF THE FILE DOESN'T EXIST AN IO-EXCEPTION WILL BE CAUGHT
println("Error reading file");
}
}
罪魁禍首是'InputStream is = getClass()。getResourceAsStream(「/ data/file.txt」);'is is null。 – SMA 2015-02-08 13:05:31
http://stackoverflow.com/questions/16842306/how-to-read-a-file-from-jar-archive或 http://stackoverflow.com/questions/3369794/how-to-a -java-in-java – emin 2015-02-08 13:23:31