java - RestTemplate postForObject 无法映射除 String.class 之外的自定义类

Question

我试图使用 RestTemplate postForObject 使用 firebase Auth API，但是当我将 String.class 指定为其工作文件的返回类型时，但如果我指定自定义类来处理响应，则失败，尽管自定义类属性与JSON 返回，

restTemplate.postForObject( uri, request, UserResponse.class);

public class UserResponse {

    private String kind;
    private String localId;
    private String email;
    private String displayName;
    private String idToken;
    private Boolean registered;

    public String getKind() {
        return kind;
    }

    public void setKind(String kind) {
        this.kind = kind;
    }

    public String getLocalId() {
        return localId;
    }

    public void setLocalId(String localId) {
        this.localId = localId;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getDisplayName() {
        return displayName;
    }

    public void setDisplayName(String displayName) {
        this.displayName = displayName;
    }

    public String getIdToken() {
        return idToken;
    }

    public void setIdToken(String idToken) {
        this.idToken = idToken;
    }

    public Boolean getRegistered() {
        return registered;
    }

    public void setRegistered(Boolean registered) {
        this.registered = registered;
    }
}

谁能指出我错了；

异常(exception):

2020-04-09 16:06:06.980 ERROR 18200 --- [           main] o.s.boot.SpringApplication               : Application run failed

java.lang.IllegalStateException: Failed to execute CommandLineRunner
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:787) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:768) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:322) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    at aaa.Application.main(Application.java:10) ~[classes/:na]
Caused by: org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class aaa.model.UserResponse] and content type [application/json;charset=UTF-8]
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:123) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:741) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:674) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:418) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at aaa.config.Bootstrap.run(Bootstrap.java:49) ~[classes/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:784) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
    ... 5 common frames omitted

Answer 1

添加jackson依赖项。

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.8.3</version>
</dependency>