JSON与String互转 以及两种JSON里的（数组和对象）的数据获取 |
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目录 数据转换： String 转 JSON ： JSON 转 String： JSON里的数组获取 方法1：使用JSONbject类。 方法2：使用Jackson库将字符串转换为JsonNode对象： JSON里的对象获取 方法1：使用JSONbject类。 方法2：使用Jackson库将字符串转换为JsonNode对象： 数据转换： String 转 JSON ： String result = "{\n" + " \"code\": 200,\n" + " \"message\": \"查询成功\",\n" + " \"result\": {\n" + " \"records\": [\n" + " {\n" + " \"jobName\": \"高级开发工程师\",\n" + " \"jobExperience\": \"一年以下\",\n" + " \"education\": \"本科\"\n" + " },\n" + " {\n" + " \"jobName\": \"高级开发工程师\",\n" + " \"jobExperience\": \"一年以下\",\n" + " \"education\": \"本科\"\n" + " }\n" + " ],\n" + " \"total\": 1,\n" + " \"size\": 10,\n" + " \"current\": 1,\n" + " \"pages\": 1\n" + " }\n" + "}"; JSONObject jsonObject = JSON.parseObject(result); JSON 转 String： String result = "{\n" + " \"code\": 200,\n" + " \"message\": \"查询成功\",\n" + " \"result\": {\n" + " \"records\": [\n" + " {\n" + " \"jobName\": \"高级开发工程师\",\n" + " \"jobExperience\": \"一年以下\",\n" + " \"education\": \"本科\"\n" + " },\n" + " {\n" + " \"jobName\": \"高级开发工程师\",\n" + " \"jobExperience\": \"一年以下\",\n" + " \"education\": \"本科\"\n" + " }\n" + " ],\n" + " \"total\": 1,\n" + " \"size\": 10,\n" + " \"current\": 1,\n" + " \"pages\": 1\n" + " }\n" + "}"; try { JSONObject jsonObject = JSON.parseObject(result); String result2 = JSON.toJSONString(jsonObject); JSON里的数组获取 方法1：使用JSONbject类。 public static void main(String[] args) { String result = "{\n" + " \"code\": 200,\n" + " \"message\": \"查询成功\",\n" + " \"result\": {\n" + " \"records\": [\n" + " {\n" + " \"jobName\": \"高级开发工程师\",\n" + " \"jobExperience\": \"一年以下\",\n" + " \"education\": \"本科\"\n" + " },\n" + " {\n" + " \"jobName\": \"高级开发工程师\",\n" + " \"jobExperience\": \"一年以下\",\n" + " \"education\": \"本科\"\n" + " }\n" + " ],\n" + " \"total\": 1,\n" + " \"size\": 10,\n" + " \"current\": 1,\n" + " \"pages\": 1\n" + " }\n" + "}"; try { JSONObject jsonObject = new JSONObject(result); JSONObject resultObject = jsonObject.getJSONObject("result"); JSONArray recordsArray = resultObject.getJSONArray("records"); for (int i = 0; i < recordsArray.size(); i++) { JSONObject recordObject = recordsArray.getJSONObject(i); String jobName = recordObject.getString("jobName"); String jobExperience = recordObject.getString("jobExperience"); String education = recordObject.getString("education"); System.out.println("Job Name: " + jobName); System.out.println("Job Experience: " + jobExperience); System.out.println("Education: " + education); System.out.println(); } } catch (Exception e) { e.printStackTrace(); } } 方法2：使用Jackson库将字符串转换为JsonNode对象： public static void main(String[] args) { String result = "{\n" + " \"code\": 200,\n" + " \"message\": \"查询成功\",\n" + " \"result\": {\n" + " \"records\": [\n" + " {\n" + " \"jobName\": \"高级开发工程师\",\n" + " \"jobExperience\": \"一年以下\",\n" + " \"education\": \"本科\"\n" + " },\n" + " {\n" + " \"jobName\": \"高级开发工程师\",\n" + " \"jobExperience\": \"一年以下\",\n" + " \"education\": \"本科\"\n" + " }\n" + " ],\n" + " \"total\": 1,\n" + " \"size\": 10,\n" + " \"current\": 1,\n" + " \"pages\": 1\n" + " }\n" + "}"; try { ObjectMapper objectMapper = new ObjectMapper(); JsonNode jsonNode = objectMapper.readTree(result); JsonNode recordsNode = jsonNode.get("result").get("records"); for (JsonNode recordNode : recordsNode) { String jobName = recordNode.get("jobName").asText(); String jobExperience = recordNode.get("jobExperience").asText(); String education = recordNode.get("education").asText(); System.out.println("Job Name: " + jobName); System.out.println("Job Experience: " + jobExperience); System.out.println("Education: " + education); System.out.println(); } } catch (Exception e) { e.printStackTrace(); } } JSON里的对象获取 方法1：使用JSONbject类。 public class Main { public static void main(String[] args) { String jsonString = "{\"name\": \"John\", \"age\": 30}"; try { JSONObject jsonObject = new JSONObject(jsonString); String name = jsonObject.getString("name"); int age = jsonObject.getInt("age"); System.out.println("Name: " + name); // 输出: John System.out.println("Age: " + age); // 输出: 30 } catch (Exception e) { e.printStackTrace(); } } } 方法2：使用Jackson库将字符串转换为JsonNode对象： public class Main { public static void main(String[] args) { String jsonString = "{\"name\": \"John\", \"age\": 30}"; try { ObjectMapper objectMapper = new ObjectMapper(); JsonNode jsonNode = objectMapper.readTree(jsonString); // 可以使用jsonNode进行进一步的处理 System.out.println(jsonNode.get("name").asText()); // 输出: John System.out.println(jsonNode.get("age").asInt()); // 输出: 30 } catch (Exception e) { e.printStackTrace(); } } } |
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