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(); }

原文地址这里写链接内容