Java编程Post数据请求和接收代码详解

urlConn.setRequestProperty("Content-Type","text/plain; charset=utf-8"); 

urlConn.setRequestProperty("Content-Type","application/x-www-form-urlencoded"); 

request.getParameter(参数名); 

    // 接收请求数据
    BufferedReader reader = request.getReader();
    char[] buf = new char[512];
    int len = 0;
    StringBuffer contentBuffer = new StringBuffer();
    while ((len = reader.read(buf)) != -1) {
      contentBuffer.append(buf, 0, len);
    }
        String content = contentBuffer.toString();
        
        if(content == null){
            content = "";
        }

public class UrlConnection {
	@SuppressWarnings("finally") 
	  public static Boolean response(String url,String content) {
		String line     = "";
		String message    = "";
		String returnData  = "";
		Boolean postState   = false;
		BufferedReader bufferedReader = null;
		try {
			URL urlObject = new URL(url);
			HttpURLConnection urlConn = (HttpURLConnection) urlObject.openConnection();
			urlConn.setDoOutput(true);
			/*设定禁用缓存*/
			urlConn.setRequestProperty("Pragma:", "no-cache");
			urlConn.setRequestProperty("Cache-Control", "no-cache");
			/*维持长连接*/
			urlConn.setRequestProperty("Connection", "Keep-Alive");
			/*设置字符集*/
			urlConn.setRequestProperty("Charset", "UTF-8");
			/*设定输出格式为json*/
			urlConn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
			/*设置使用POST的方式发送*/
			urlConn.setRequestMethod("POST");
			/*设置不使用缓存*/
			urlConn.setUseCaches(false);
			/*设置容许输出*/
			urlConn.setDoOutput(true);
			/*设置容许输入*/
			urlConn.setDoInput(true);
			urlConn.connect();
			OutputStreamWriter outStreamWriter = new OutputStreamWriter(urlConn.getOutputStream(),"UTF-8");
			outStreamWriter.write(content);
			outStreamWriter.flush();
			outStreamWriter.close();
			/*若post失败*/
			if((urlConn.getResponseCode() != 200)){
				returnData = "{\"jsonStrStatus\":0,\"processResults\":[]}";
				message = "发送POST失败！"+ "code="+urlConn.getResponseCode() + "," + "失败消息："+ urlConn.getResponseMessage();
				// 定义BufferedReader输入流来读取URL的响应 
				InputStream errorStream = urlConn.getErrorStream();
				if(errorStream != null) 
				        {
					InputStreamReader inputStreamReader = new InputStreamReader(errorStream,"utf-8");
					bufferedReader = new BufferedReader(inputStreamReader);
					while ((line = bufferedReader.readLine()) != null) {
						message += line;
					}
					inputStreamReader.close();
				}
				errorStream.close();
				System.out.println("发送失败！错误信息为："+message);
			} else{
				/*发送成功返回发送成功状态*/
				postState = true;
				// 定义BufferedReader输入流来读取URL的响应 
				InputStream inputStream = urlConn.getInputStream();
				InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"utf-8");
				bufferedReader = new BufferedReader(inputStreamReader);
				while ((line = bufferedReader.readLine()) != null) {
					message += line;
				}
				returnData = message;
				inputStream.close();
				inputStreamReader.close();
				System.out.println("发送POST成功！返回内容为：" + message);
			}
		}
		catch (Exception e) {
			e.printStackTrace();
		}
		finally{
			try {
				if (bufferedReader != null) {
					bufferedReader.close();
				}
			}
			catch (IOException ex) {
				ex.printStackTrace();
			}
			return postState;
		}
	}
	/*读取request数据*/
	public static String getRequestData(HttpServletRequest request) throws IOException{
		BufferedReader reader = request.getReader();
		char[] buf = new char[512];
		int len = 0;
		StringBuffer contentBuffer = new StringBuffer();
		while ((len = reader.read(buf)) != -1) {
			contentBuffer.append(buf, 0, len);
		}
		String content = contentBuffer.toString();
		if(content == null){
			content = "";
		}
		return content;
	}
}