InputStream,String,File相互转化

最新推荐文章于 2025-01-21 00:16:41 发布

转载最新推荐文章于 2025-01-21 00:16:41 发布 · 819 阅读

文章标签：

#string #file #buffer #stream #byte #null

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本文介绍了如何在Java中实现不同类型的文件流转换，包括String到InputStream、InputStream到String、File到InputStream以及InputStream到File的转换方法。

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1. String --> InputStream
InputStream String2InputStream(String str){
ByteArrayInputStream stream = new ByteArrayInputStream(str.getBytes());
return stream;
}

2. InputStream --> String
String inputStream2String(InputStream is){
BufferedReader in = new BufferedReader(new InputStreamReader(is));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = in.readLine()) != null){
buffer.append(line);
}
return buffer.toString();
}

3、File --> InputStream
InputStream in = new InputStream(new FileInputStream(File));

上面这行报错，new InputStream 报错

下面这样写即可

new FileInputStream(file)

4、InputStream --> File
public void inputstreamtofile(InputStream ins,File file){
OutputStream os = new FileOutputStream(file);
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
os.write(buffer, 0, bytesRead);
}
os.close();
ins.close();
}