try{result=quotaParamProdService.importQuotaParamProd(user,file.getinputStream());}catch(IOException e){logger.error("输入流获取错误");}return ApiResult.OK(result);}需要关闭流吗
时间: 2024-03-21 09:40:55 浏览: 53
是的,你需要在 `try-catch` 块中使用 `finally` 块来关闭输入流。因为输入流是一个资源,需要在使用完毕后及时关闭以释放系统资源。如果不关闭输入流,可能会导致内存泄漏和资源浪费。你可以像这样来关闭输入流:
```
InputStream inputStream = null;
try {
inputStream = file.getInputStream();
result = quotaParamProdService.importQuotaParamProd(user, inputStream);
} catch (IOException e) {
logger.error("输入流获取错误");
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
logger.error("输入流关闭错误");
}
}
}
return ApiResult.OK(result);
```
在这里,我们使用了 `finally` 块来确保无论异常是否发生,都会关闭输入流。如果关闭输入流时发生异常,我们也会捕获并记录错误。
相关问题
优化这段代码 private byte[] getScriptData() { ClassPathResource cps = new ClassPathResource("request_rate_limiter.lua"); try (InputStream in = cps.getInputStream()) { byte[] data = new byte[in.available()]; in.read(data); return data; } catch (Exception e) { LOGGER.error("获取lua脚本异常", e); } return null; }
这段代码可以进行以下优化:
1. 将try语句块中的代码提取为一个方法,避免代码重复。
2. 使用try-with-resources语句块自动关闭流。
3. 使用字节数组输出流ByteArrayOutputStream将数据从输入流中读取,避免使用in.available()方法,该方法在某些情况下会返回错误的结果。
4. 在出现异常时,不要只记录日志,应该抛出异常或返回默认值,以便调用者能够处理异常情况。
下面是优化后的代码示例:
```
private byte[] getScriptData() {
ClassPathResource cps = new ClassPathResource("request_rate_limiter.lua");
try {
return readStream(cps.getInputStream());
} catch (IOException e) {
LOGGER.error("获取lua脚本异常", e);
return new byte[0];
}
}
private byte[] readStream(InputStream in) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while ((len = in.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
return out.toByteArray();
}
```
下面代码的数据走向是什么,我该打开哪个文件,去查看数据的走向, package com.psbc.ncpab.communication; import com.psbc.ncpab.config.TcpConfig; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Conditional; import org.springframework.stereotype.Component; import java.io.*; import java.net.InetAddress; import java.net.InetSocketAddress; import java.net.Socket; import javax.net.ssl.SSLSocketFactory; @Component @Conditional(TcpClientCondition.class) public class DefaultSocketClient implements Client { private final TcpConfig tcpConfig; private static final Logger log = LoggerFactory.getLogger(DefaultSocketClient.class); @Autowired public DefaultSocketClient(TcpConfig tcpConfig) { this.tcpConfig = tcpConfig; } public String doSend(String content, String key) throws IOException { log.info("Content={}", content); log.info("=============DefaultSocketClient.doSend================="); try (Socket socket = new Socket()) { log.info("tcpConfig.getAddress={}", tcpConfig.getAddress()); log.info("tcpConfig.getPort={}", tcpConfig.getPort()); log.info("tcpConfig.getTimeout={}", tcpConfig.getTimeout()); log.info("tcpConfig.getEncoding={}", tcpConfig.getEncoding()); socket.connect(new InetSocketAddress(InetAddress.getByName(tcpConfig.getAddress()), tcpConfig.getPort()), tcpConfig.getTimeout()); socket.setSoTimeout(tcpConfig.getTimeout()); OutputStream outputStream = socket.getOutputStream(); outputStream.write(content.getBytes(tcpConfig.getEncoding())); outputStream.flush(); InputStream inputStream = socket.getInputStream(); String response = receiveData(inputStream); inputStream.close(); outputStream.close(); socket.close(); log.info("Response={}", response); return response; } } private String receiveData(InputStream inputStream) throws IOException { int length = -1; byte[] buffer = new byte[2048]; StringBuilder stringBuilder = new StringBuilder(); while((length = inputStream.read(buffer)) != -1) { stringBuilder.append(new String(buffer, 0, length, tcpConfig.getEncoding())); } return stringBuilder.toString(); } }
这段代码是一个TCP客户端的实现,用于向指定的服务器发送请求并接收响应。具体来说,它创建一个Socket对象连接到指定的服务器地址和端口,将请求内容转换成字节数组并通过Socket的输出流发送给服务器,然后通过Socket的输入流接收服务器的响应,将其转换成字符串并返回。
至于数据的走向,可以通过查看服务器端的代码来确定响应是如何处理和返回的。在这段代码中,并没有指定要打开哪个文件来查看数据的走向。
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