Spring REST风格的Web服务POST对象

问题描述：

我遇到了Spring和Gson将我的对象发布到服务器的麻烦。我得到的结果是空的，即使它包含数据。Spring REST风格的Web服务POST对象

此代码段是从RESTful Web服务：

@RequestMapping("/summe") 
    public @ResponseBody String summe(ArrayList<ServiceSettingsListItem> list) { 
    return "Greeting.summe() = <" + list + ">" + list.size(); 
}

我的客户：

private static Gson gson = new GsonBuilder().create(); 

public static void main(String[] args) throws IOException { 
    String fileContent = new String(Files.readAllBytes(new 
File("demo.json").toPath())); 
    ServiceSettings serviceSettings = gson.fromJson(fileContent, 
ServiceSettings.class); 
    String baseUrl = serviceSettings.getUrl(); 
    RestTemplate restTemplate = new RestTemplate(); 
    String result = restTemplate.postForObject(baseUrl, serviceSettings, String.class); 
    System.out.println(result); 
} 

public static class ServiceSettings { 

    @Override 
    public String toString() { 
     return "ServiceSettings [url=" + url + ", test=" + test + ", items=" 
    + items + "]"; 
    } 

    private String url; 
    private int test; 
    private ArrayList<ServiceSettingsListItem> items = new ArrayList<>(); 

    public String getUrl() { 
     return url; 
    } 

    public void setUrl(String url) { 
     this.url = url; 
    } 

    public int getTest() { 
     return test; 
    } 

    public void setTest(int test) { 
     this.test = test; 
    } 

    public ArrayList<ServiceSettingsListItem> getItems() { 
     return items; 
    } 

    public void setItems(ArrayList<ServiceSettingsListItem> items) { 
     this.items = items; 
    } 

} 

public static class ServiceSettingsListItem { 
    private String name; 
    private int value; 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public int getValue() { 
     return value; 
    } 

    public void setValue(int value) { 
     this.value = value; 
    } 

}

}

这里是我的JSON：

{"url":"http://localhost:8080/summe", 
"test":123, 
"items":[ 
{"name":"name1","value":5}, 
{"name":"name1","value":6} 
] 
}

我希望得到一个答案但是结果表明它是0.

答

而不是发布ServiceSettings对象，您需要发布items元素，因为控制器期望有效负载为列表。请尝试以下操作：

ServiceSettings serviceSettings = gson.fromJson(fileContent, ServiceSettings.class); 
String baseUrl = serviceSettings.getUrl(); 
RestTemplate restTemplate = new RestTemplate(); 
String result = restTemplate.postForObject(baseUrl, serviceSettings.getItems(), String.class); //Assuming there is a getter for items

Spring REST风格的Web服务POST对象

相关推荐