本文整理了Java中java.io.BufferedReader类的一些代码示例，展示了BufferedReader类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。BufferedReader类的具体详情如下：
包路径：java.io.BufferedReader
类名称：BufferedReader

BufferedReader介绍

[英]Wraps an existing Reader and buffers the input. Expensive interaction with the underlying reader is minimized, since most (smaller) requests can be satisfied by accessing the buffer alone. The drawback is that some extra space is required to hold the buffer and that copying takes place when filling that buffer, but this is usually outweighed by the performance benefits.

A typical application pattern for the class looks like this:

BufferedReader buf = new BufferedReader(new FileReader("file.java"));

[中]包装现有读卡器并缓冲输入。与底层读取器的昂贵交互被最小化，因为大多数（较小的）请求可以通过单独访问缓冲区来满足。缺点是需要一些额外的空间来保存缓冲区，并且在填充缓冲区时会进行复制，但这通常会被性能优势所抵消。
该类的典型应用程序模式如下所示：

BufferedReader buf = new BufferedReader(new FileReader("file.java"));

代码示例

canonical example by Tabnine

public void postRequest(String urlStr, String jsonBodyStr) throws IOException {
  URL url = new URL(urlStr);
  HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
  httpURLConnection.setDoOutput(true);
  httpURLConnection.setRequestMethod("POST");
  httpURLConnection.setRequestProperty("Content-Type", "application/json");
  try (OutputStream outputStream = httpURLConnection.getOutputStream()) { 
   outputStream.write(jsonBodyStr.getBytes());
   outputStream.flush();
  }
  if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
    try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()))) {
      String line;
      while ((line = bufferedReader.readLine()) != null) {
        // ... do something with line
      }
    }
  } else {
    // ... do something with unsuccessful response
  }
}

canonical example by Tabnine

public void readAllLines(InputStream in) throws IOException {
 try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in))) {
  String line;
  while ((line = bufferedReader.readLine()) != null) {
   // ... do something with line
  }
 }
}

代码示例来源：origin: stackoverflow.com

import java.net.*;
import java.io.*;

public class URLConnectionReader {
  public static void main(String[] args) throws Exception {
    URL yahoo = new URL("http://www.yahoo.com/");
    URLConnection yc = yahoo.openConnection();
    BufferedReader in = new BufferedReader(
                new InputStreamReader(
                yc.getInputStream()));
    String inputLine;

    while ((inputLine = in.readLine()) != null) 
      System.out.println(inputLine);
    in.close();
  }
}

代码示例来源：origin: libgdx/libgdx

@Override
        public void run () {
          BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()), 1);
          try {
            int c = 0;
            while ((c = reader.read()) != -1) {
              callback.character((char)c);						
            }
          } catch (IOException e) {
//                        e.printStackTrace();
          }
        }
      });

代码示例来源：origin: stackoverflow.com

try(BufferedReader br = new BufferedReader(new FileReader(file))) {
  for(String line; (line = br.readLine()) != null; ) {
    // process the line.
  }
  // line is not visible here.
}

代码示例来源：origin: stackoverflow.com

String contentType = connection.getHeaderField("Content-Type");
String charset = null;

for (String param : contentType.replace(" ", "").split(";")) {
  if (param.startsWith("charset=")) {
    charset = param.split("=", 2)[1];
    break;
  }
}

if (charset != null) {
  try (BufferedReader reader = new BufferedReader(new InputStreamReader(response, charset))) {
    for (String line; (line = reader.readLine()) != null;) {
      // ... System.out.println(line) ?
    }
  }
} else {
  // It's likely binary content, use InputStream/OutputStream.
}

代码示例来源：origin: stackoverflow.com

BufferedReader br = new BufferedReader(new FileReader("file.txt"));
try {
  StringBuilder sb = new StringBuilder();
  String line = br.readLine();

  while (line != null) {
    sb.append(line);
    sb.append(System.lineSeparator());
    line = br.readLine();
  }
  String everything = sb.toString();
} finally {
  br.close();
}

代码示例来源：origin: eugenp/tutorials

private String bodyToString(InputStream body) throws IOException {
    StringBuilder builder = new StringBuilder();
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(body, StandardCharsets.UTF_8));
    String line = bufferedReader.readLine();
    while (line != null) {
      builder.append(line).append(System.lineSeparator());
      line = bufferedReader.readLine();
    }
    bufferedReader.close();
    return builder.toString();
  }
}

代码示例来源：origin: stackoverflow.com

HttpResponse response; // some response object
BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
String json = reader.readLine();
JSONTokener tokener = new JSONTokener(json);
JSONArray finalResult = new JSONArray(tokener);

代码示例来源：origin: google/guava

/**
 * Returns a buffered reader that reads from a file using the given character set.
 *
 * <p><b>{@link java.nio.file.Path} equivalent:</b> {@link
 * java.nio.file.Files#newBufferedReader(java.nio.file.Path, Charset)}.
 *
 * @param file the file to read from
 * @param charset the charset used to decode the input stream; see {@link StandardCharsets} for
 *     helpful predefined constants
 * @return the buffered reader
 */
public static BufferedReader newReader(File file, Charset charset) throws FileNotFoundException {
 checkNotNull(file);
 checkNotNull(charset);
 return new BufferedReader(new InputStreamReader(new FileInputStream(file), charset));
}

代码示例来源：origin: loklak/loklak_server

public static JSONArray readJsonFromUrl(String url) throws IOException, JSONException {
  InputStream is = new URL(url).openStream();
  try {
    BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
    String jsonText = readAll(rd);
    JSONArray json = new JSONArray(jsonText);
    return json;
  } finally {
    is.close();
  }
}

代码示例来源：origin: stackoverflow.com

import java.net.*;
import java.io.*;

URL whatismyip = new URL("http://checkip.amazonaws.com");
BufferedReader in = new BufferedReader(new InputStreamReader(
        whatismyip.openStream()));

String ip = in.readLine(); //you get the IP as a String
System.out.println(ip);

代码示例来源：origin: airbnb/lottie-android

@WorkerThread
private LottieResult fetchFromNetworkInternal() throws IOException {
 L.debug( "Fetching " + url);
 HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
 connection.setRequestMethod("GET");
 connection.connect();
 if (connection.getErrorStream() != null || connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
  BufferedReader r = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
  StringBuilder error = new StringBuilder();
  String line;
  while ((line = r.readLine()) != null) {
   error.append(line).append('\n');
   extension = FileExtension.Zip;
   file = networkCache.writeTempCacheFile(connection.getInputStream(), extension);
   result = LottieCompositionFactory.fromZipStreamSync(new ZipInputStream(new FileInputStream(file)), url);
   break;
  case "application/json":
   extension = FileExtension.Json;
   file = networkCache.writeTempCacheFile(connection.getInputStream(), extension);
   result = LottieCompositionFactory.fromJsonInputStreamSync(new FileInputStream(new File(file.getAbsolutePath())), url);
   break;

代码示例来源：origin: stackoverflow.com

String urlParameters = "param1=a&param2=b&param3=c";
URL url = new URL("http://example.com/index.php");
URLConnection conn = url.openConnection();

conn.setDoOutput(true);

OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());

writer.write(urlParameters);
writer.flush();

String line;
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));

while ((line = reader.readLine()) != null) {
  System.out.println(line);
}
writer.close();
reader.close();

代码示例来源：origin: stackoverflow.com

private static String getValue(Part part) throws IOException {
  BufferedReader reader = new BufferedReader(new InputStreamReader(part.getInputStream(), "UTF-8"));
  StringBuilder value = new StringBuilder();
  char[] buffer = new char[1024];
  for (int length = 0; (length = reader.read(buffer)) > 0;) {
    value.append(buffer, 0, length);
  }
  return value.toString();
}

代码示例来源：origin: apache/incubator-pinot

private boolean updateIndexConfig(String tableName, TableConfig tableConfig)
  throws Exception {
 String request =
   ControllerRequestURLBuilder.baseUrl("http://" + _controllerAddress).forTableUpdateIndexingConfigs(tableName);
 HttpURLConnection httpURLConnection = (HttpURLConnection) new URL(request).openConnection();
 httpURLConnection.setDoOutput(true);
 httpURLConnection.setRequestMethod("PUT");
 BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(httpURLConnection.getOutputStream(), "UTF-8"));
 writer.write(tableConfig.toJSONConfigString());
 writer.flush();
 BufferedReader reader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(), "UTF-8"));
 return reader.readLine().equals("done");
}

代码示例来源：origin: Netflix/eureka

public static String readEc2MetadataUrl(MetaDataKey metaDataKey, URL url, int connectionTimeoutMs, int readTimeoutMs) throws IOException {
    HttpURLConnection uc = (HttpURLConnection) url.openConnection();
    uc.setConnectTimeout(connectionTimeoutMs);
    uc.setReadTimeout(readTimeoutMs);
    uc.setRequestProperty("User-Agent", "eureka-java-client");

    if (uc.getResponseCode() != HttpURLConnection.HTTP_OK) {  // need to read the error for clean connection close
      BufferedReader br = new BufferedReader(new InputStreamReader(uc.getErrorStream()));
      try {
        while (br.readLine() != null) {
          // do nothing but keep reading the line
        }
      } finally {
        br.close();
      }
    } else {
      return metaDataKey.read(uc.getInputStream());
    }

    return null;
  }
}

代码示例来源：origin: eclipse-vertx/vert.x

public static JsonObject getContent() throws IOException {
 URL url = new URL("http://localhost:8080");
 HttpURLConnection conn = (HttpURLConnection) url.openConnection();
 conn.connect();
 InputStreamReader in = new InputStreamReader((InputStream) conn.getContent());
 BufferedReader buff = new BufferedReader(in);
 String line;
 StringBuilder builder = new StringBuilder();
 do {
  line = buff.readLine();
  builder.append(line).append("\n");
 } while (line != null);
 buff.close();
 return new JsonObject(builder.toString());
}

代码示例来源：origin: stackoverflow.com

InputStream in = socket.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(in));
// The other side says hello:
String text = br.readLine();
// For whatever reason, you want to read one single byte from the stream,
// That single byte, just after the newline:
byte b = (byte) in.read();

代码示例来源：origin: wildfly/wildfly

public static String readStringFromStdin(String message) throws Exception {
  System.out.print(message);
  System.out.flush();
  System.in.skip(System.in.available());
  BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));
  String line=reader.readLine();
  return line != null? line.trim() : null;
}