Spring Rest JSON发布空值 [英] Spring rest json post null values

问题描述

我有一个Spring rest终结点，它在做一个简单的hello应用程序.它应该接受{"name":"something"}并返回"Hello，something".

I have a Spring rest endpoint doing a simple hello app. It should accept a {"name":"something"} and return "Hello, something".

我的控制器是:

@RestController
public class GreetingController { 

    private static final String template = "Hello, %s!";

    @RequestMapping(value="/greeting", method=RequestMethod.POST)
    public String greeting(Person person) {
        return String.format(template, person.getName());
    }

}

人员:

public class Person {

    private String name;

    public Person() {
        this.name = "World";
    }

    public Person(String name) {
        this.name = name;
    }

    public String getName() {
        return this.name;
    }

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

当我向

curl -X POST -d '{"name": "something"}' http://localhost:8081/testapp/greeting

我知道

Hello, World!

好像没有正确地将json反序列化为Person对象.它使用的是默认构造函数，然后未设置名称.我发现了这一点:如何在REST中创建POST请求以接受JSON输入?，所以我尝试在控制器上添加@RequestBody，但这会导致一些有关内容类型'application/x-www-form-urlencoded; charset = UTF- 8'不支持".我在这里看到了它的内容:内容@RequestBody MultiValueMap不支持输入'application/x-www-form-urlencoded; charset = UTF-8'，建议删除@RequestBody

Looks like it isn't deserializing the json into the Person object properly. It's using the default constructor and then not setting the name. I found this: How to create a POST request in REST to accept a JSON input? so I tried adding an @RequestBody on the controller but that causes some error about "Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported". I see that is covered here: Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported for @RequestBody MultiValueMap which suggests removing the @RequestBody

我尝试删除也不喜欢的默认构造函数.

I have tried removing the default constructor which it doesn't like either.

此问题涵盖了空值使用Spring的REST Web服务MVC在发布JSON时返回null ，但建议添加@RequestBody，但这与上面的冲突...

This question covers null values REST webservice using Spring MVC returning null while posting JSON but it suggests adding @RequestBody but that conflicts with above...

推荐答案

您必须设置@RequestBody告诉Spring应该使用什么来设置person param.

You must set the @RequestBody to tell to Spring what should be use to set your personparam.

 public Greeting greeting(@RequestBody Person person) {
    return new Greeting(counter.incrementAndGet(), String.format(template, person.getName()));
} 

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