尝试使用Java解析JSON字符串时发生错误

Question

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东西，但有了一些主意。有了我，我有构建代码，但它不起作用。当尝试执行我的代码时，它将引发错误。我无法解决错误。

看到下面是我的代码：

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":[]}}

当我执行代码时，它会引发如下错误：

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"

请帮助我解决此问题，在此先感谢

Answer 1

对我来说，这似乎是JSON中的一个错误。使用org.json解析器，它可以正常工作。

问题在于它试图将值解析为整数，并且超出了普通Java基本整数类型的范围。它可以将其解析为a BigInteger，也可以解析为a double（这将使JSON保持不变，而实际上不区分整数和浮点值）。

如果.0在JSON值的末尾添加a ，则在JSON简单中效果很好，但是在我看来，您不必这样做。