java - 如何在 Java 中从 JSON 字符串中获取数组？

Question

这个问题已经有答案了:

How to parse JSON in Java (36 个回答)

已关闭 5 年前。

我有一个如下的 JSON 字符串，我从 Web 服务调用中获取该字符串。如何从 builds 键检索数组。

 {
  "actions" : [
    {

    },
    null,
    {

    }
  ],
  "description" : "<a href=\"ws/product/target/product-10.7-SNAPSHOT.zip\" style=\"font-size: 50px\">Download Branch Build</a>",
  "displayName" : "EPIC-AUTODEV-8413",
  "displayNameOrNull" : null,
  "name" : "EPIC-AUTODEV-8413",
  "url" : "http://localhost:80/jenkins/view/Branch-Builds/job/EPIC-AUTODEV-8413/",
  "buildable" : false,
  "builds" : [
    {
      "number" : 71,
      "url" : "http://localhost:80/jenkins/view/Branch-Builds/job/EPIC-AUTODEV-8413/71/"
    },
    {
      "number" : 70,
      "url" : "http://localhost:80/jenkins/view/Branch-Builds/job/EPIC-AUTODEV-8413/70/"
    },
    {
      "number" : 69,
      "url" : "http://localhost:80/jenkins/view/Branch-Builds/job/EPIC-AUTODEV-8413/69/"
    },
    {
      "number" : 68,
      "url" : "http://localhost:80/jenkins/view/Branch-Builds/job/EPIC-AUTODEV-8413/68/"
    },
    {
      "number" : 67,
      "url" : "http://localhost:80/jenkins/view/Branch-Builds/job/EPIC-AUTODEV-8413/67/"
    },
    {
      "number" : 66,
      "url" : "http://localhost:80/jenkins/view/Branch-Builds/job/EPIC-AUTODEV-8413/66/"
    },

}

我尝试过 tree=builds[*] ，但它给了我这样的输出

{"builds":[{},{},{},{},{},{},{},{},{},{},{}]}

Answer 1

尝试javascript方法JSON.parse，下面是示例

var obj = JSON.parse('{ "name":"John", "age":30, "city":"New York"}');

上面会给你对象，而不是你想要的部分。

如果您希望将对象转换回 json，请尝试 JSON.stringify()

var myJSON = JSON.stringify(obj);