将JSON发布到REST API

Question

我正在创建一个REST API，它将接受JSON请求。

我正在使用CURL进行测试：

curl -i -POST -H 'Accept: application/json' -d '{"id":1,"pan":11111}' http://localhost:8080/PurchaseAPIServer/api/purchase

但是出现以下错误：

HTTP/1.1 415 Unsupported Media Type
Server: Apache-Coyote/1.1
Content-Type: text/html;charset=utf-8
Content-Length: 1051
Date: Wed, 25 Apr 2012 21:36:14 GMT

The server refused this request because the request entity is in a format not supported by the requested resource for the requested method ().

调试时，它甚至都不会进入控制器中的create动作。

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
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.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;

import com.app.model.Purchase;
import com.app.service.IPurchaseService;

@Controller
public class PurchaseController {

    @Autowired
    private IPurchaseService purchaseService;

    @RequestMapping(value = "purchase", method = RequestMethod.GET)
    @ResponseBody
    public final List<Purchase> getAll() {
        return purchaseService.getAll();
    }

    @RequestMapping(value = "purchase", method = RequestMethod.POST)
    @ResponseStatus( HttpStatus.CREATED )
    public void create(@RequestBody final Purchase entity) {
        purchaseService.addPurchase(entity);
    }
}

更新

我将Jackson配置添加到AppConfig.java：

@Configuration
@ComponentScan(basePackages = "com.app")
public class AppConfig {

    @Bean
    public AnnotationMethodHandlerAdapter annotationMethodHandlerAdapter()
    {
        final AnnotationMethodHandlerAdapter annotationMethodHandlerAdapter = new AnnotationMethodHandlerAdapter();
        final MappingJacksonHttpMessageConverter mappingJacksonHttpMessageConverter = new MappingJacksonHttpMessageConverter();

        HttpMessageConverter<?>[] httpMessageConverter = { mappingJacksonHttpMessageConverter };

        String[] supportedHttpMethods = { "POST", "GET", "HEAD" };

        annotationMethodHandlerAdapter.setMessageConverters(httpMessageConverter);
        annotationMethodHandlerAdapter.setSupportedMethods(supportedHttpMethods);

        return annotationMethodHandlerAdapter;
    }
}

我的GET现在可以正常工作了：

curl -i -H "Content-Type:application/json" -H "Accept:application/json" http://localhost:8080/PurchaseAPIServer/api/purchase

HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Content-Type: application/json
Transfer-Encoding: chunked
Date: Thu, 26 Apr 2012 21:19:55 GMT

[{"id":1,"pan":111}]

但是尝试POST时得到以下信息：

curl -i -X POST -H "Content-Type:application/json" -H "Accept:application/json" http://localhost:8080/PurchaseAPIServer/api/purchaseMe -d "{"id":2,"pan":122}"

HTTP/1.1 400 Bad Request
Server: Apache-Coyote/1.1
Content-Type: text/html;charset=utf-8
Content-Length: 971
Date: Thu, 26 Apr 2012 21:29:56 GMT
Connection: close

The request sent by the client was syntactically incorrect ().

我的模特：

@Entity
@XmlRootElement
public class Purchase implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 6603477834338392140L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private Long pan;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Long getPan() {
        return pan;
    }

    public void setPan(Long pan) {
        this.pan = pan;
    }

}

有什么想法我要去哪里吗？

谢谢

Answer 1

正如sdouglass所建议的那样，SpringMVC自动检测杰克逊并设置一个MappingJacksonHttpMessageConverter来处理与JSON的转换。但是我确实需要明确配置转换器以使其正常工作，正如他还指出的那样。

我添加了以下内容，并且我的CURL GET请求正在工作..万岁。

AppConfig.java

@Configuration
@ComponentScan(basePackages = "com.app")
public class AppConfig {

    @Bean
    public AnnotationMethodHandlerAdapter annotationMethodHandlerAdapter()
    {
        final AnnotationMethodHandlerAdapter annotationMethodHandlerAdapter = new AnnotationMethodHandlerAdapter();
        final MappingJacksonHttpMessageConverter mappingJacksonHttpMessageConverter = new MappingJacksonHttpMessageConverter();

        HttpMessageConverter<?>[] httpMessageConverter = { mappingJacksonHttpMessageConverter };

        String[] supportedHttpMethods = { "POST", "GET", "HEAD" };

        annotationMethodHandlerAdapter.setMessageConverters(httpMessageConverter);
        annotationMethodHandlerAdapter.setSupportedMethods(supportedHttpMethods);

        return annotationMethodHandlerAdapter;
    }
}






curl -i -H "Content-Type:application/json" -H "Accept:application/json" http://localhost:8080/PurchaseAPIServer/api/purchase

HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Content-Type: application/json
Transfer-Encoding: chunked
Date: Thu, 26 Apr 2012 21:19:55 GMT

[{"id":1,"pan":111}]

但是以下CURL POST仍然无法正常工作（从不执行控制器操作，也不提供任何控制台调试信息。

curl -i -X POST -H "Content-Type:application/json"  http://localhost:8080/PurchaseAPIServer/api/purchaseMe -d "{"id":2,"pan":122}"

HTTP/1.1 400 Bad Request
Server: Apache-Coyote/1.1
Content-Type: text/html;charset=utf-8
Content-Length: 971
Date: Thu, 26 Apr 2012 21:29:56 GMT
Connection: close

The request sent by the client was syntactically incorrect ().

因此，我添加了Logback来开始一些详细的调试。

<configuration>

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
            </pattern>
        </encoder>
    </appender>

    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
        <file>/home/thomas/springApps/purchaseapi.log</file>
        <encoder>
            <pattern>%date %level [%thread] %logger{10} [%file:%line] %msg%n
            </pattern>
        </encoder>
    </appender>

    <logger name="org.hibernate" level="DEBUG" />

    <logger name="org.springframework" level="TRACE" />
    <logger name="org.springframework.transaction" level="INFO" />
    <logger name="org.springframework.security" level="INFO" /> <!-- to debug security related issues (DEBUG) -->
    <logger name="org.springframework.web.servlet.mvc" level="TRACE" /> <!-- some serialization issues are at trace level here: org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod -->

    <!-- our service -->
    <logger name="com.app" level="DEBUG" />
    <!-- <logger name="com.app" level="INFO" /> --><!-- to follow if setup is being executed -->

    <root level="INFO">
        <appender-ref ref="FILE" />
    </root>

</configuration>

在 org.springframework.web.servlet.mvc中 添加TRACE级别的调试，为我提供了解决问题的方法。

2012-04-28 14:17:44,579 DEBUG [http-bio-8080-exec-3] o.s.w.s.m.m.a.RequestResponseBodyMethodProcessor [AbstractMessageConverterMethodArgumentResolver.java:117] Reading [com.app.model.Purchase] as "application/json" using [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter@74a14fed]
2012-04-28 14:17:44,604 TRACE [http-bio-8080-exec-3] o.s.w.s.m.m.a.ServletInvocableHandlerMethod [InvocableHandlerMethod.java:159] Error resolving argument [0] [type=com.app.model.Purchase]
HandlerMethod details: 
Controller [com.app.controller.PurchaseController]
Method [public void com.app.controller.PurchaseController.create(com.app.model.Purchase)]

org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Unexpected character ('p' (code 112)): was expecting double-quote to start field name

我将CURL POST更改为以下所有内容：

curl -i -X POST -H "Content-Type:application/json" http://localhost:8080/PurchaseAPIServer/api/purchase -d '{"pan":11111}'
HTTP/1.1 201 Created
Server: Apache-Coyote/1.1
Content-Length: 0
Date: Sat, 28 Apr 2012 13:19:40 GMT

希望有人觉得这很有用。