使用Jackson将地图转换为JSON [英] Convert Map to JSON using Jackson

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：

  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）; 
 
 
 
 
 $ b $ p 
 $ b $ p所以，当我使用它调用它时： p> 
 
 
  curl -HAccept：application / json-HContent-type：application / json\ 
  - X POST -d'{name：value}'http：// localhost：8080 / myservice / validate 
  
将以下内容接收到stdout（这正是我想要的）： 
 
 
  {name：value } 
  
是否有更好的方式使用Jackson来代替Google的Gson和/或我你可以转换 Map 来完成这个任务吗？  
解决方案至 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/validate
Receive 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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