本文介绍了使用Jackson将地图转换为JSON的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我如何使用Jackson将地图转换为有效的JSON?
我正在使用Google的GSON通过Spring Boot REST Post方法执行此操作...
p>以下是RESTful Web服务:
至 JSON ,如下所示:
Map< String,String> payload = new HashMap<>();
payload.put(key1,value1);
payload.put(key2,value2);
String json = new ObjectMapper()。writeValueAsString(payload);
System.out.println(json);
How can I convert a Map to a valid JSON using Jackson?
I am doing it using Google's GSON via a Spring Boot REST Post method...
Here's the RESTful Web Service:
import java.util.Map; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import com.fasterxml.jackson.core.JsonFactory; import com.fasterxml.jackson.core.JsonParser; import com.google.gson.Gson; @RestController @RequestMapping("/myservice") public class ValidationService { @RequestMapping(value="/validate", method = RequestMethod.POST) public void validate(@RequestBody Map<String, Object> payload) throws Exception { Gson gson = new Gson(); String json = gson.toJson(payload); System.out.println(json); } }So, when I invoke it using this:
curl -H "Accept: application/json" -H "Content-type: application/json" \ -X POST -d '{"name":"value"}' http://localhost:8080/myservice/validateReceive the following to stdout (this is exactly what I want):
{"name":"value"}Is there a better way to do this using Jackson instead of Google's Gson and / or am I going about it the wrong way altogether?
解决方案You can convert Map to JSON using Jackson as follows:
Map<String,String> payload = new HashMap<>(); payload.put("key1","value1"); payload.put("key2","value2"); String json = new ObjectMapper().writeValueAsString(payload); System.out.println(json);
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