java 中InputStream,String,File之间的相互转化对比
作者:Rain
这篇文章主要介绍了java 中InputStream,String,File之间的相互转化对比的相关资料,需要的朋友可以参考下
InputStream,String,File相互转化
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(); }
今天从网上看到了另一种方法,特拿来分享
String all_content=null; try { all_content =new String(); InputStream ins = 获取的输入流; ByteArrayOutputStream outputstream = new ByteArrayOutputStream(); byte[] str_b = new byte[1024]; int i = -1; while ((i=ins.read(str_b)) > 0) { outputstream.write(str_b,0,i); } all_content = outputstream.toString(); } catch (Exception e) { e.printStackTrace(); }
此两种方法上面一种更快,但是比较耗内存,后者速度慢,耗资源少
3、File --> InputStream
InputStream in = new InputStream(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(); }
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