InputStreamReader input = new InputStreamReader(System.in, "UTF-8");中UTF-8是什么意思
时间: 2024-03-31 21:34:59 浏览: 19
UTF-8是一种Unicode字符编码方式,它是一种变长的编码方式,可以表示Unicode标准中的任意字符,包括ASCII字符和非ASCII字符。在这里,UTF-8作为参数传递给InputStreamReader构造方法,表示使用UTF-8编码方式来读取输入流中的数据。这样做的好处是可以避免出现乱码等问题。
相关问题
import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.Socket; import java.util.Scanner; public class Client { public static void main(String[] args) { new Client().go();// 创建一个新的 client 对象,并调用 go() 方法 } public void go() { try { Socket sock = new Socket("127.0.0.1", 5000); InputStreamReader streamReader = new InputStreamReader(sock.getInputStream()); BufferedReader reader = new BufferedReader(streamReader); PrintWriter writer = new PrintWriter(sock.getOutputStream()); System.out.println("Connected to server."); System.out.println("请输入你想对服务端说的话:"); Thread readerThread = new Thread(new IncomingReader(reader)); readerThread.start(); Scanner userInput = new Scanner(System.in); while (true) { String message = userInput.nextLine(); writer.println(message); writer.flush(); } } catch (Exception ex) { ex.printStackTrace(); } } public class IncomingReader implements Runnable { BufferedReader reader; public IncomingReader(BufferedReader reader) { this.reader = reader; } public void run() { String message; try { while ((message = reader.readLine()) != null) { System.out.println(message); } } catch (Exception ex) { ex.printStackTrace(); } } } }请在原有代码的基础上添加对应的注释
下面是针对给出代码的注释说明:
```java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;
public class Client {
public static void main(String[] args) {
new Client().go(); // 创建一个新的 client 对象,并调用 go() 方法
}
public void go() {
try {
Socket sock = new Socket("127.0.0.1", 5000); // 创建 Socket 连接到指定 IP 地址和端口号
InputStreamReader streamReader = new InputStreamReader(sock.getInputStream()); // 创建输入流读取服务器发送的消息
BufferedReader reader = new BufferedReader(streamReader);
PrintWriter writer = new PrintWriter(sock.getOutputStream()); // 创建输出流向服务器发送消息
System.out.println("Connected to server."); // 连接成功,输出提示信息
System.out.println("请输入你想对服务端说的话:");
Thread readerThread = new Thread(new IncomingReader(reader)); // 创建一个线程用于读取服务器发送的消息
readerThread.start(); // 启动线程
Scanner userInput = new Scanner(System.in); // 创建 Scanner 对象,用于读取用户输入的消息
while (true) {
String message = userInput.nextLine(); // 读取用户输入的消息
writer.println(message); // 向服务器发送消息
writer.flush(); // 立即刷新输出流
}
} catch (Exception ex) {
ex.printStackTrace(); // 捕获并打印异常
}
}
public class IncomingReader implements Runnable { // 该类实现 Runnable 接口,用于在新线程中读取服务器发送的消息
BufferedReader reader;
public IncomingReader(BufferedReader reader) {
this.reader = reader;
}
public void run() {
String message;
try {
while ((message = reader.readLine()) != null) { // 循环读取服务器发送的消息
System.out.println(message); // 输出服务器发送的消息
}
} catch (Exception ex) {
ex.printStackTrace(); // 捕获并打印异常
}
}
}
}
```
// 设置身份验证凭据 String username = "SHLT"; String password = "91SN4Qq9"; String auth = username + ":" + password; byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes()); String authHeaderValue = "Basic " + new String(encodedAuth); // 设置连接到API端点 String endpoint = "http://dataservice.rjh.com.cn:9002/api/data?methodname=车辆管理"; URL url = new URL(endpoint); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); connection.setRequestProperty("Authorization", authHeaderValue); // 读取API端点的响应 BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream())); String inputLine; StringBuffer response = new StringBuffer(); while ((inputLine = in.readLine()) != null) { response.append(inputLine); } in.close(); String s = response.toString(); System.out.println(s);优化以下这段代码,让response转成utf-8
以下是优化后的代码:
```java
String username = "SHLT";
String password = "91SN4Qq9";
String auth = username + ":" + password;
byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes());
String authHeaderValue = "Basic " + new String(encodedAuth);
String endpoint = "http://dataservice.rjh.com.cn:9002/api/data?methodname=车辆管理";
URL url = new URL(endpoint);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setRequestProperty("Authorization", authHeaderValue);
InputStream inputStream = new BufferedInputStream(connection.getInputStream());
String encoding = "UTF-8"; // 指定返回结果的编码方式
String s = IOUtils.toString(inputStream, encoding); // 使用第三方库Apache Commons IO将InputStream转换成字符串
System.out.println(s);
```
主要的优化点是使用了第三方库Apache Commons IO来将`InputStream`转换成字符串,并指定了使用UTF-8编码进行转换。这样就可以确保响应结果被正确地转换成了UTF-8编码的字符串。
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