如果您有java.io.InputStream对象,应该如何处理该对象并生成String?
假设我有一个包含文本数据的InputStream,我想将其转换为String,例如,我可以将其写入日志文件。
获取InputStream并将其转换为字符串的最简单方法是什么?
public String convertStreamToString(InputStream is) {
// ???
}
如果您有java.io.InputStream对象,应该如何处理该对象并生成String?
假设我有一个包含文本数据的InputStream,我想将其转换为String,例如,我可以将其写入日志文件。
获取InputStream并将其转换为字符串的最简单方法是什么?
public String convertStreamToString(InputStream is) {
// ???
}
当前回答
这里或多或少有sampath的答案,清理了一点并表示为函数:
String streamToString(InputStream in) throws IOException {
StringBuilder out = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader(in));
for(String line = br.readLine(); line != null; line = br.readLine())
out.append(line);
br.close();
return out.toString();
}
其他回答
这是最适合Android和任何其他JVM的纯Java解决方案。
这个解决方案非常好。。。它简单、快速,适用于大小河流!!(见上文第8号基准)
public String readFullyAsString(InputStream inputStream, String encoding)
throws IOException {
return readFully(inputStream).toString(encoding);
}
public byte[] readFullyAsBytes(InputStream inputStream)
throws IOException {
return readFully(inputStream).toByteArray();
}
private ByteArrayOutputStream readFully(InputStream inputStream)
throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length = 0;
while ((length = inputStream.read(buffer)) != -1) {
baos.write(buffer, 0, length);
}
return baos;
}
一个很好的方法是使用Apache Commons IOUItils将InputStream复制到StringWriter中。。。类似于
StringWriter writer = new StringWriter();
IOUtils.copy(inputStream, writer, encoding);
String theString = writer.toString();
甚至
// NB: does not close inputStream, you'll have to use try-with-resources for that
String theString = IOUtils.toString(inputStream, encoding);
或者,如果不想混合流和写入器,可以使用ByteArrayOutputStream。
就reduce和concat而言,它可以在Java 8中表示为:
String fromFile = new BufferedReader(new
InputStreamReader(inputStream)).lines().reduce(String::concat).get();
JDK 7/8应答,关闭流并仍然抛出IOException:
StringBuilder build = new StringBuilder();
byte[] buf = new byte[1024];
int length;
try (InputStream is = getInputStream()) {
while ((length = is.read(buf)) != -1) {
build.append(new String(buf, 0, length));
}
}
将inputStream转换为字符串的方法
public static String getStringFromInputStream(InputStream inputStream) {
BufferedReader bufferedReader = null;
StringBuilder stringBuilder = new StringBuilder();
String line;
try {
bufferedReader = new BufferedReader(new InputStreamReader(
inputStream));
while ((line = bufferedReader.readLine()) != null) {
stringBuilder.append(line);
}
} catch (IOException e) {
logger.error(e.getMessage());
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException e) {
logger.error(e.getMessage());
}
}
}
return stringBuilder.toString();
}