在我的 java 类中，我从 blk...dat 的文件中提取交易的哈希，然后通过读取 URL：https ://blockchain.info/rawtx/+ hash 获取相应交易的数据。有一次，我的程序在调用 1370 次 url 后停止调用，另外一次，我的程序在调用 2243 次 url 后停止调用。无论我等待多长时间，该程序都不会终止，也不会继续进行。
在这种情况下发生了什么？
由于调用次数超过了此处描述的硬限制：https ://blockchain.info/api ，我怀疑这不是我缺少 API-Key 的问题。但在这种情况下，我怎样才能获得 API-Key？我没有网站（java-application 用于我的学士论文），似乎网上有不少人在从 blockchain.info 获取 API-Key 时遇到问题。
可能是因为我正在使用的网络质量，如果是的话，有没有办法用我的java程序解决它？
如果这是 blockchain.info 方面的固有问题，有人可以推荐我另一种方法来获得类似的交易数据吗？
我的代码：
import org.bitcoinj.core.*;
import org.bitcoinj.core.Transaction;
import org.bitcoinj.utils.*;
import java.io.*;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.*;
import org.bitcoinj.params.MainNetParams;
import org.json.*;
public class ParseFromDat {
private static String readAll(Reader rd) throws IOException {
StringBuilder sb = new StringBuilder();
int cp;
while ((cp = rd.read()) != -1) {
sb.append((char) cp);
}
return sb.toString();
}
public static JSONObject readJsonFromUrl(String url) throws IOException, JSONException {
InputStream is = new URL(url).openStream();
try {
BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
String jsonText = readAll(rd);
JSONObject json = new JSONObject(jsonText);
return json;
} finally {
is.close();
}
}
public static void main(String[] args) throws IOException, JSONException {
Context.getOrCreate(MainNetParams.get());
// Arm the blockchain file loader.
NetworkParameters np = new MainNetParams();
List<File> blockChainFiles = new ArrayList<File>();
blockChainFiles.add(new File("C:\\Users\\...\\AppData\\Roaming\\Bitcoin\\blocks\\blk00514.dat"));
BlockFileLoader bfl = new BlockFileLoader(np, blockChainFiles);
// define files to be written into
PrintWriter transactions = new PrintWriter(new File("./csvs/transactions.csv"));
StringBuilder traStr = new StringBuilder();
traStr.append("tranHashString:ID(Trans)\n");
PrintWriter sendAdd = new PrintWriter(new File("./csvs/sendAdd.csv"));
StringBuilder sendStr = new StringBuilder();
sendStr.append("addr:ID(SendAdd),value,tranHashString,addr_tag_link,addr_tag\n");
PrintWriter receiveAdd = new PrintWriter(new File("./csvs/receiveAdd.csv"));
StringBuilder receiStr = new StringBuilder();
receiStr.append("addr:ID(ReceAdd),value,tranHashString,addr_tag_link,addr_tag\n");
PrintWriter inTran = new PrintWriter(new File("./csvs/intran.csv"));
StringBuilder inStr = new StringBuilder();
inStr.append(":START_ID(SendAdd),:END_ID(Trans)\n");
PrintWriter outTran = new PrintWriter(new File("./csvs/outtran.csv"));
StringBuilder outStr = new StringBuilder();
outStr.append(":START_ID(Trans),:END_ID(ReceAdd)\n");
// Iterate over the blocks in the dataset.
int counter = 0;
for (Block block : bfl) {
System.out.println("aaaa");
List<Transaction> trans = block.getTransactions();
for (Transaction ta : trans) {
System.out.println("bbbb");
traStr.append(ta.getHashAsString());
traStr.append("\n");
System.out.println("bbbb1 " + (counter++));
System.out.println(ta.getHashAsString());
JSONObject json = readJsonFromUrl("https://blockchain.info/rawtx/" + ta.getHashAsString());
JSONArray inputs = json.getJSONArray("inputs");
for (int i = 0; i < inputs.length(); i++) {
if (inputs.getJSONObject(i).has("prev_out")) { // it is possible that the value is null even when prev_out is not null
System.out.println("ccc");
JSONObject prevOut = (JSONObject) (inputs.getJSONObject(i).get("prev_out"));
inStr.append(prevOut.get("addr").toString());
inStr.append(',');
inStr.append(ta.getHashAsString());
inStr.append("\n");
sendStr.append(prevOut.get("addr").toString());
sendStr.append(',');
sendStr.append(prevOut.get("value").toString());
sendStr.append(',');
sendStr.append(ta.getHashAsString());
if (prevOut.has("addr_tag_link") || prevOut.has("addr_tag")) {
if (prevOut.has("addr_tag_link") && prevOut.has("addr_tag")) {
sendStr.append(prevOut.get("addr_tag_link").toString());
sendStr.append(',');
sendStr.append(prevOut.get("addr_tag").toString());
} else if (prevOut.has("addr_tag_link")) {
sendStr.append(prevOut.get("addr_tag_link").toString());
sendStr.append(',');
sendStr.append("null");
} else {
sendStr.append("null");
sendStr.append(',');
sendStr.append(prevOut.get("addr_tag").toString());
}
}
sendStr.append("\n");
}else{
continue;
}
}
JSONArray out = json.getJSONArray("out");
for (int i = 0; i < out.length(); i++) {
JSONObject outItem = out.getJSONObject(i);
if (outItem.has("addr")) { // it is possible that the add and value is null?
outStr.append(ta.getHashAsString());
outStr.append(',');
outStr.append(outItem.get("addr").toString());
outStr.append("\n");
receiStr.append(outItem.get("addr").toString());
receiStr.append(',');
receiStr.append(outItem.get("value").toString());
receiStr.append(',');
receiStr.append(ta.getHashAsString());
if (outItem.has("addr_tag_link") || outItem.has("addr_tag")) {
if (outItem.has("addr_tag_link") && outItem.has("addr_tag")) {
receiStr.append(outItem.get("addr_tag_link").toString());
receiStr.append(',');
receiStr.append(outItem.get("addr_tag").toString());
} else if (outItem.has("addr_tag_link")) {
receiStr.append(outItem.get("addr_tag_link").toString());
receiStr.append(',');
receiStr.append("null");
} else {
receiStr.append("null");
receiStr.append(',');
receiStr.append(outItem.get("addr_tag").toString());
}
}
receiStr.append("\n");
}else{
continue;
}
}
}
}
transactions.write(traStr.toString());
transactions.close();
sendAdd.write(sendStr.toString());
sendAdd.close();
receiveAdd.write(receiStr.toString());
receiveAdd.close();
inTran.write(inStr.toString());
inTran.close();
outTran.write(outStr.toString());
outTran.close();
}
}