Question

我正在使用下面的代码片段从服务器检索数据。这些数据真的很大。寻找更好的方法来优化这个或修复片段。感谢：

URL url = new URL("http://www.example.com" + path);
                    Map<String, Object> params = new LinkedHashMap<>();
                    params.put("param_1", value_1);
                    params.put("param_2",value_2);
                    StringBuilder postData = new StringBuilder();
                    for (Map.Entry<String, Object> param : params.entrySet()) {
                        if (postData.length() != 0) postData.append('&');
                        postData.append(URLEncoder.encode(param.getKey(), "UTF-8"));
                        postData.append('=');
                        postData.append(URLEncoder.encode(String.valueOf(param.getValue()), "UTF-8"));
                    }
                    byte[] postDataBytes = postData.toString().getBytes("UTF-8");

                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.setRequestMethod("POST");
                    conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                    conn.setRequestProperty("Content-Length", String.valueOf(postDataBytes.length));
                    conn.setDoOutput(true);
                    conn.setConnectTimeout(3000);
                    conn.getOutputStream().write(postDataBytes);

                    BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
                    String output = "";
                    String line = null;
                    while ((line = in.readLine()) != null) {
                        output += (line + "\n"); // this take forever with large data set
                    }

Answer 1

创建BufferReader时，需要减小分配的堆的大小。

BufferReader的默认构造函数为8192个字符分配缓冲区。尝试使用较少计数字符的BufferedReader（Reader in，int size）。

引起：网络调用中的java.lang.OutOfMemoryError

1 个答案: