【发布时间】：2015-07-22 20:48:10
【问题描述】：
我正在尝试使用 java 解析 JSON 字符串。我不知道该怎么做，我在互联网上搜索了很多，我得到了一些想法。有了它，我有构建代码，但它不起作用。当尝试执行我的代码时，它会引发错误。我无法解决错误。
下面是我的代码：
import java.util.*;
import java.io.*;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
public class JSOnNStringParsing {
public static void main(String[] args) {
try
{
BufferedReader read=new BufferedReader(new FileReader("D:\\Kavi works\\OutputFiles\\JSON_String.txt"));
String line=read.readLine();
while(line!=null)
{
System.out.println("Line = "+line);
JSONParser jsonParser = new JSONParser();
JSONObject jsonObject = (JSONObject) jsonParser.parse(line);
System.out.println("Read : "+jsonObject.get("read"));
JSONArray network = (JSONArray) jsonObject.get("network");
Iterator<String> iterator = network.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}
}
}
catch(Exception e)
{
System.out.println("Error occured :"+e);
}
}
}
我的 JSON 字符串在该文件中：
{"read":"2015-05-07T19:30:48.165009273+05:30","network":{"rx_bytes":11124,"rx_packets":116,"rx_errors":0,"rx_dropped":0,"tx_bytes":648,"tx_packets":8,"tx_errors":0,"tx_dropped":0},"cpu_stats":{"cpu_usage":{"total_usage":157158138204,"percpu_usage":[157158138204],"usage_in_kernelmode":49530000000,"usage_in_usermode":58420000000},"system_cpu_usage":258964110000000,"throttling_data":{"periods":0,"throttled_periods":0,"throttled_time":0}},"memory_stats":{"usage":73969664,"max_usage":74600448,"stats":{"active_anon":73928704,"active_file":4096,"cache":86016,"hierarchical_memory_limit":18446744073709551615,"inactive_anon":4096,"inactive_file":32768,"mapped_file":32768,"pgfault":62880,"pgmajfault":0,"pgpgin":34656,"pgpgout":34482,"rss":73883648,"rss_huge":67108864,"total_active_anon":73928704,"total_active_file":4096,"total_cache":86016,"total_inactive_anon":4096,"total_inactive_file":32768,"total_mapped_file":32768,"total_pgfault":62880,"total_pgmajfault":0,"total_pgpgin":34656,"total_pgpgout":34482,"total_rss":73883648,"total_rss_huge":67108864,"total_unevictable":0,"total_writeback":0,"unevictable":0,"writeback":0},"failcnt":0,"limit":2099310592},"blkio_stats":{"io_service_bytes_recursive":[],"io_serviced_recursive":[],"io_queue_recursive":[],"io_service_time_recursive":[],"io_wait_time_recursive":[],"io_merged_recursive":[],"io_time_recursive":[],"sectors_recursive":[]}}
当我执行我的代码时，它会抛出如下错误：
Line = {"read":"2015-05-07T19:30:48.165009273+05:30","network":{"rx_bytes":11124,"rx_packets":116,"rx_errors":0,"rx_dropped":0,"tx_bytes":648,"tx_packets":8,"tx_errors":0,"tx_dropped":0},"cpu_stats":{"cpu_usage":{"total_usage":157158138204,"percpu_usage":[157158138204],"usage_in_kernelmode":49530000000,"usage_in_usermode":58420000000},"system_cpu_usage":258964110000000,"throttling_data":{"periods":0,"throttled_periods":0,"throttled_time":0}},"memory_stats":{"usage":73969664,"max_usage":74600448,"stats":{"active_anon":73928704,"active_file":4096,"cache":86016,"hierarchical_memory_limit":18446744073709551615,"inactive_anon":4096,"inactive_file":32768,"mapped_file":32768,"pgfault":62880,"pgmajfault":0,"pgpgin":34656,"pgpgout":34482,"rss":73883648,"rss_huge":67108864,"total_active_anon":73928704,"total_active_file":4096,"total_cache":86016,"total_inactive_anon":4096,"total_inactive_file":32768,"total_mapped_file":32768,"total_pgfault":62880,"total_pgmajfault":0,"total_pgpgin":34656,"total_pgpgout":34482,"total_rss":73883648,"total_rss_huge":67108864,"total_unevictable":0,"total_writeback":0,"unevictable":0,"writeback":0},"failcnt":0,"limit":2099310592},"blkio_stats":{"io_service_bytes_recursive":[],"io_serviced_recursive":[],"io_queue_recursive":[],"io_service_time_recursive":[],"io_wait_time_recursive":[],"io_merged_recursive":[],"io_time_recursive":[],"sectors_recursive":[]}}
Error occured :java.lang.NumberFormatException: For input string: "18446744073709551615"
请帮我解决这个问题，在此先感谢
【问题讨论】：
-
请显示 full 堆栈跟踪 - 而不仅仅是它的第一行。
-
18446744073709551615 = 2^64 但带符号的 long 仅为 2^63-1