[英]Why doesn't my code write to a text file?
我想知道为什么我的代码不写到文本文件,JVM不会抛出任何异常...
public class AlterData {
Data[] information;
File informationFile = new File("/Users/RamanSB/Documents/JavaFiles/Information.txt");
FileWriter fw;
public void populateData(){
information = new Data[3];
information[0] = new Data("Big Chuckzino", "Custom House", 18);
information[1] = new Data("Rodger Penrose", "14 Winston Lane", 19);
information[2] = new Data("Jermaine Cole", "32 Forest Hill Drive", 30);
}
public void writeToFile(Data[] rawData){
try{
fw = new FileWriter(informationFile);
BufferedWriter bw = new BufferedWriter(fw);
for(Data people : rawData){
bw.write(people.getName()+ ", ");
bw.write(people.getAddress() + ", ");
bw.write(people.getAge() +", |");
}
}catch(IOException ex){
ex.printStackTrace();
}
}
public static void main(String[] args){
AlterData a1 = new AlterData();
a1.populateData();
a1.writeToFile(a1.information);
}
}
您应该为BufferedWriter
实例调用close
或flush
以便将数据刷新到文件中。 无论如何,关闭您正在使用的任何资源始终很重要。
尝试在写入数据后调用bw.flush()
,然后在刷新后必须使用bw.close()
关闭流。
关闭BufferedWriter
,最好将close
语句放入finally块中,以确保无论如何都关闭流。
您还应该考虑对资源进行尝试。 这利用了BufferedWriter
的AutoCloseable
功能,如下所示:
try (BufferedWriter writer = new BufferedWriter(new FileWriter(new File("path/to/file")))) {
// Do something with writer
} catch (IOException e) {
e.printStackTrace();
}
这样,无论发生什么情况,java都会确保在离开try主体时为您关闭流。
您需要确保,我们需要flush()将更改推送到文件, 还请确保您正在关闭文件资源:
public void writeToFile(Data[] rawData){
BufferedWriter bw = null;
try{
fw = new FileWriter(informationFile);
bw = new BufferedWriter(fw);
for(Data people : rawData){
bw.write(people.getName()+ ", ");
bw.write(people.getAddress() + ", ");
bw.write(people.getAge() +", |");
}
}catch(IOException ex){
ex.printStackTrace();
} finally {
if(fw != null) {
fw.close();
fw = null;
}
if(bw != null) {
bw.close();
bw = null;
}
}
}
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