Java使用URLConnection写入和读取数据

谁践踏了优雅 2022-04-16 01:00 263阅读 0赞

通过应用程序使用URLConnection访问Servlet（该Servlet的功能为将InputStream传入的字符串转换为大写字字母并重新写入OutputStream），将字符串数据写入OutputStream传入Servlet中，并通过InputStream获取Servlet的返回结果。  
  
  
  
应用程序代码：  
  
URL url = new URL("http://localhost:8080/URLConnection/servlet/Receive");  
  
HttpURLConnection httpURLConnection = (HttpURLConnection) url  
.openConnection();  
httpURLConnection.setDoOutput(true);  
httpURLConnection.setRequestMethod("POST");  
httpURLConnection.setRequestProperty("Content-Type", "text/xml");  
  
OutputStream outputStream = httpURLConnection.getOutputStream();  
  
BufferedWriter bufferedWriter = new BufferedWriter(  
new OutputStreamWriter(outputStream));  
  
StringBuffer stringBuffer = new StringBuffer();  
stringBuffer.append("wlnmyr is very nice");  
stringBuffer.append("myr is a good man");  
  
bufferedWriter.write(stringBuffer.toString());  
bufferedWriter.flush();  
bufferedWriter.close();  
  
InputStream inputStream = httpURLConnection.getInputStream();  
  
BufferedReader bufferedReader = new BufferedReader(  
new InputStreamReader(inputStream));  
  
String line = null;  
  
while ((line = bufferedReader.readLine()) != null) \{  
  
System.out.println(line);  
\}  
  
  
  
  
  
Servlet代码：  
  
ServletInputStream in = request.getInputStream();  
  
BufferedReader bufferedReader = new BufferedReader(  
new InputStreamReader(in));  
  
String line = null;  
  
StringBuffer stringBuffer = new StringBuffer();  
  
while ((line = bufferedReader.readLine()) != null) \{  
  
stringBuffer.append(line.toUpperCase());  
  
\}  
  
ServletOutputStream out = response.getOutputStream();  
  
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(out));  
bufferedWriter.write(stringBuffer.toString());  
bufferedWriter.flush();  
bufferedWriter.close();  
  
注意：首先布署Servlet，开户服务器，然后运行应用程序。