Java使用URLConnection写入和读取数据
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。