使用regex在数组字符串中拆分JSON对象

时间：2018-02-25 15:01:17

标签： java json regex

我有一个以下格式的字符串：

[{"HostName":"taskmanager1","Rack":"/default-rack","State":"RUNNING","NodeId":"taskmanager1:45454","NodeHTTPAddress":"taskmanager1:8042","LastHealthUpdate":1519568501615,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024},{"HostName":"datanode2","Rack":"/default-rack","State":"RUNNING","NodeId":"datanode2:45454","NodeHTTPAddress":"datanode2:8042","LastHealthUpdate":1519260876106,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024},{"HostName":"taskmanager3","Rack":"/default-rack","State":"RUNNING","NodeId":"taskmanager3:45454","NodeHTTPAddress":"taskmanager3:8042","LastHealthUpdate":1519568502251,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024},{"HostName":"datanode3","Rack":"/default-rack","State":"RUNNING","NodeId":"datanode3:45454","NodeHTTPAddress":"datanode3:8042","LastHealthUpdate":1519260871527,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024},{"HostName":"taskmanager2","Rack":"/default-rack","State":"RUNNING","NodeId":"taskmanager2:45454","NodeHTTPAddress":"taskmanager2:8042","LastHealthUpdate":1519568502259,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024},{"HostName":"datanode1","Rack":"/default-rack","State":"RUNNING","NodeId":"datanode1:45454","NodeHTTPAddress":"datanode1:8042","LastHealthUpdate":1519260875647,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024}]

我想将其拆分为多个（此处为6）JSON格式，但我的模式无法根据需要拆分。

我想要这样的事情：

{"HostName":"taskmanager1","Rack":"/default-rack","State":"RUNNING","NodeId":"taskmanager1:45454","NodeHTTPAddress":"taskmanager1:8042","LastHealthUpdate":1519568501615,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024},
{"HostName":"datanode2","Rack":"/default-rack","State":"RUNNING","NodeId":"datanode2:45454","NodeHTTPAddress":"datanode2:8042","LastHealthUpdate":1519260876106,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024},
{"HostName":"taskmanager3","Rack":"/default-rack","State":"RUNNING","NodeId":"taskmanager3:45454","NodeHTTPAddress":"taskmanager3:8042","LastHealthUpdate":1519568502251,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024},
{"HostName":"datanode3","Rack":"/default-rack","State":"RUNNING","NodeId":"datanode3:45454","NodeHTTPAddress":"datanode3:8042","LastHealthUpdate":1519260871527,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024}
,{"HostName":"taskmanager2","Rack":"/default-rack","State":"RUNNING","NodeId":"taskmanager2:45454","NodeHTTPAddress":"taskmanager2:8042","LastHealthUpdate":1519568502259,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024},
{"HostName":"datanode1","Rack":"/default-rack","State":"RUNNING","NodeId":"datanode1:45454","NodeHTTPAddress":"datanode1:8042","LastHealthUpdate":1519260875647,"HealthReport":"","NodeManagerVersion":"2.8.3","NumContainers":0,"UsedMemoryMB":0,"AvailableMemoryMB":1024}

使用代码：

List<String> res = Arrays.asList(temp.replace('[', ' ').replace(']',' ').trim()).split(",");

它将针对每个,字符进行拆分，使用模式split("},\\}")也会删除}和{字符。

如何将其拆分为制作Json对象的愿望？

使用Java模式(\\{.+})将整个字符串分组。

2 个答案:

答案 0 :(得分：4)

您可以将JSON解析为数组，并将内容视为单个字符串。以下是示例代码：

import org.json.JSONArray;

public class orgJson1Main {
    private static final String sample = "[{\"HostName\":\"taskmanager1\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"taskmanager1:45454\",\"NodeHTTPAddress\":\"taskmanager1:8042\",\"LastHealthUpdate\":1519568501615,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024},{\"HostName\":\"datanode2\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"datanode2:45454\",\"NodeHTTPAddress\":\"datanode2:8042\",\"LastHealthUpdate\":1519260876106,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024},{\"HostName\":\"taskmanager3\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"taskmanager3:45454\",\"NodeHTTPAddress\":\"taskmanager3:8042\",\"LastHealthUpdate\":1519568502251,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024},{\"HostName\":\"datanode3\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"datanode3:45454\",\"NodeHTTPAddress\":\"datanode3:8042\",\"LastHealthUpdate\":1519260871527,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024},{\"HostName\":\"taskmanager2\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"taskmanager2:45454\",\"NodeHTTPAddress\":\"taskmanager2:8042\",\"LastHealthUpdate\":1519568502259,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024},{\"HostName\":\"datanode1\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"datanode1:45454\",\"NodeHTTPAddress\":\"datanode1:8042\",\"LastHealthUpdate\":1519260875647,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024}]";

    public static void main(String[] args) {
        JSONArray array = new JSONArray(sample);
        for(int i=0; i < array.length(); i++){
            System.out.println(array.get(i));
        }
    }

}

<强>输出：

{"NodeManagerVersion":"2.8.3","Rack":"/default-rack","LastHealthUpdate":1519568501615,"HealthReport":"","State":"RUNNING","AvailableMemoryMB":1024,"NodeId":"taskmanager1:45454","UsedMemoryMB":0,"NodeHTTPAddress":"taskmanager1:8042","HostName":"taskmanager1","NumContainers":0}
{"NodeManagerVersion":"2.8.3","Rack":"/default-rack","LastHealthUpdate":1519260876106,"HealthReport":"","State":"RUNNING","AvailableMemoryMB":1024,"NodeId":"datanode2:45454","UsedMemoryMB":0,"NodeHTTPAddress":"datanode2:8042","HostName":"datanode2","NumContainers":0}
{"NodeManagerVersion":"2.8.3","Rack":"/default-rack","LastHealthUpdate":1519568502251,"HealthReport":"","State":"RUNNING","AvailableMemoryMB":1024,"NodeId":"taskmanager3:45454","UsedMemoryMB":0,"NodeHTTPAddress":"taskmanager3:8042","HostName":"taskmanager3","NumContainers":0}
{"NodeManagerVersion":"2.8.3","Rack":"/default-rack","LastHealthUpdate":1519260871527,"HealthReport":"","State":"RUNNING","AvailableMemoryMB":1024,"NodeId":"datanode3:45454","UsedMemoryMB":0,"NodeHTTPAddress":"datanode3:8042","HostName":"datanode3","NumContainers":0}
{"NodeManagerVersion":"2.8.3","Rack":"/default-rack","LastHealthUpdate":1519568502259,"HealthReport":"","State":"RUNNING","AvailableMemoryMB":1024,"NodeId":"taskmanager2:45454","UsedMemoryMB":0,"NodeHTTPAddress":"taskmanager2:8042","HostName":"taskmanager2","NumContainers":0}
{"NodeManagerVersion":"2.8.3","Rack":"/default-rack","LastHealthUpdate":1519260875647,"HealthReport":"","State":"RUNNING","AvailableMemoryMB":1024,"NodeId":"datanode1:45454","UsedMemoryMB":0,"NodeHTTPAddress":"datanode1:8042","HostName":"datanode1","NumContainers":0}

编辑：

首先，我从上面的代码中删除了JSONTokener。其次，为了完整性，我将添加以下代码，该代码显示如何使用最初请求的正则表达式在示例字符串中查找单个JSON对象。 

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class orgJson1Main {
    private static final String sample = "[{\"HostName\":\"taskmanager1\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"taskmanager1:45454\",\"NodeHTTPAddress\":\"taskmanager1:8042\",\"LastHealthUpdate\":1519568501615,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024},{\"HostName\":\"datanode2\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"datanode2:45454\",\"NodeHTTPAddress\":\"datanode2:8042\",\"LastHealthUpdate\":1519260876106,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024},{\"HostName\":\"taskmanager3\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"taskmanager3:45454\",\"NodeHTTPAddress\":\"taskmanager3:8042\",\"LastHealthUpdate\":1519568502251,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024},{\"HostName\":\"datanode3\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"datanode3:45454\",\"NodeHTTPAddress\":\"datanode3:8042\",\"LastHealthUpdate\":1519260871527,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024},{\"HostName\":\"taskmanager2\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"taskmanager2:45454\",\"NodeHTTPAddress\":\"taskmanager2:8042\",\"LastHealthUpdate\":1519568502259,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024},{\"HostName\":\"datanode1\",\"Rack\":\"/default-rack\",\"State\":\"RUNNING\",\"NodeId\":\"datanode1:45454\",\"NodeHTTPAddress\":\"datanode1:8042\",\"LastHealthUpdate\":1519260875647,\"HealthReport\":\"\",\"NodeManagerVersion\":\"2.8.3\",\"NumContainers\":0,\"UsedMemoryMB\":0,\"AvailableMemoryMB\":1024}]";

    public static void main(String[] args) {

        Matcher matcher = Pattern.compile("\\{[^}]*\\}").matcher(sample);
        while(matcher.find()){
            System.out.println(matcher.group());
        }
    }

}

答案 1 :(得分：2)

要拆分}, {，但在标记中保留大括号，请在此正则表达式中拆分：

"(?<=\\}), (?=\\{)"

使用后面的和向前看来断言前面的花括号并按照逗号，但不在它们中使用它们分裂。

然后整条线变为：

List<String> res = Arrays.asList(temp.replaceAll("^.|.$", "").split("(?<=\\}), (?=\\{)");

还要注意领先[和尾随]的简化修剪，但更简单地删除一个操作中的第一个和最后一个字符。

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