如何在groovy中从字符串获取密钥集？

我在Groovy中有以下字符串：

[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]

我只需要“qunit”和“utest”两个键

---

怎么可能呢？

您可以解析该JSON字符串，然后阅读列表：

def p = new JsonSlurper()
def list = 
    p.parseText("""[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], 
                   [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]""")

def keys = list.flatten().collect{it.keySet()}.flatten()

list.flatten()

list.flatten()*.keySet()

结果是

[qunit，utest]

---

这显然是特定于输入布局的。

您可以解析该JSON字符串，然后读取列表：

def p = new JsonSlurper()
def list = 
    p.parseText("""[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], 
                   [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]""")

def keys = list.flatten().collect{it.keySet()}.flatten()

list.flatten()

list.flatten()*.keySet()

结果是

[qunit，utest]

---

这显然是特定于输入布局的。

您的字符串表示一个JSON文档，因此您需要首先使用

JsonSlurper

对其进行解析：

import groovy.json.JsonSlurper

final String json = '[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]'

def list = new JsonSlurper().parseText(json)

如果打印

列表

变量，您将看到如下内容：

[[[qunit:[total:0, passed:0, failed:0, skipped:0]]], [[utest:[total:0, passed:0, failed:0, skipped:0]]]]

首先，我们需要将列表展平：

def p = new JsonSlurper()
def list = 
    p.parseText("""[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], 
                   [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]""")

def keys = list.flatten().collect{it.keySet()}.flatten()

list.flatten()

list.flatten()*.keySet()

返回如下列表：

[[qunit:[total:0, passed:0, failed:0, skipped:0]], [utest:[total:0, passed:0, failed:0, skipped:0]]]

[qunit, utest]

平铺初始列表将生成

列表

。我们可以使用扩展运算符

*

对列表中存储的每个映射执行

keySet（）

方法：

def p = new JsonSlurper()
def list = 
    p.parseText("""[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], 
                   [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]""")

def keys = list.flatten().collect{it.keySet()}.flatten()

list.flatten()

list.flatten()*.keySet()

这部分代码生成一个

list

类型的列表，如：

[[qunit], [utest]]

最后，我们可以通过最后调用

flant（）

将其转换为

List

，如下所示：

list.flatten()*.keySet().flatten()

应用最后一个操作后，我们得到如下列表：

[[qunit:[total:0, passed:0, failed:0, skipped:0]], [utest:[total:0, passed:0, failed:0, skipped:0]]]

[qunit, utest]

下面是一个完整的例子：

import groovy.json.JsonSlurper

final String json = '[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]'

def list = new JsonSlurper().parseText(json)

def keys = list.flatten()*.keySet().flatten()

assert keys == ['qunit', 'utest']

---

您的字符串表示一个JSON文档，因此需要首先使用

JsonSlurper

对其进行解析：

import groovy.json.JsonSlurper

final String json = '[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]'

def list = new JsonSlurper().parseText(json)

如果打印

列表

变量，您将看到如下内容：

[[[qunit:[total:0, passed:0, failed:0, skipped:0]]], [[utest:[total:0, passed:0, failed:0, skipped:0]]]]

首先，我们需要将列表展平：

def p = new JsonSlurper()
def list = 
    p.parseText("""[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], 
                   [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]""")

def keys = list.flatten().collect{it.keySet()}.flatten()

list.flatten()

list.flatten()*.keySet()

返回如下列表：

[[qunit:[total:0, passed:0, failed:0, skipped:0]], [utest:[total:0, passed:0, failed:0, skipped:0]]]

[qunit, utest]

平铺初始列表将生成

列表

。我们可以使用扩展运算符

*

对列表中存储的每个映射执行

keySet（）

方法：

def p = new JsonSlurper()
def list = 
    p.parseText("""[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], 
                   [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]""")

def keys = list.flatten().collect{it.keySet()}.flatten()

list.flatten()

list.flatten()*.keySet()

这部分代码生成一个

list

类型的列表，如：

[[qunit], [utest]]

最后，我们可以通过最后调用

flant（）

将其转换为

List

，如下所示：

list.flatten()*.keySet().flatten()

应用最后一个操作后，我们得到如下列表：

[[qunit:[total:0, passed:0, failed:0, skipped:0]], [utest:[total:0, passed:0, failed:0, skipped:0]]]

[qunit, utest]

下面是一个完整的例子：

import groovy.json.JsonSlurper

final String json = '[[{"qunit":{"total":0,"passed":0,"failed":0,"skipped":0}}], [{"utest": {"total":0,"passed":0,"failed":0,"skipped":0}}]]'

def list = new JsonSlurper().parseText(json)

def keys = list.flatten()*.keySet().flatten()

assert keys == ['qunit', 'utest']