那些遇到过的问题

spring mvc rest protocol缓冲http 406不可接受的错误

rob*_*jaj 4 rest spring-mvc protocol-buffers http-status-code-406

我正在使用Spring MVC 4.1.5及其REST支持尝试使用谷歌协议缓冲区消息格式的Web服务.我看过很多帖子都提到了JSON格式的这个问题,但没有一个用google协议缓冲区格式.另外我没有看到Spring框架文档有一个用于protobufs的MediaType(下面有更多内容)我的代码发布在github上

这是我的控制器代码(使用或不使用produce ="application-xprotobuf"没有区别 - 相同406不可接受的错误)

@RestController
@RequestMapping("/ws")
@EnableWebMvc
public class CustomerRestController {
    @Autowired
    private CustomerRepository customerRepository;
    //@RequestMapping(value="/customers/{id}", method = RequestMethod.GET, produces="application/x-protobuf")
    @RequestMapping(value="/customers/{id}", method = RequestMethod.GET)
    public CustomerProtos.Customer customer(@PathVariable Integer id) {
        return this.customerRepository.findById(id);
    }

    @Bean
    ProtobufHttpMessageConverter protobufHttpMessageConverter() {
        return new ProtobufHttpMessageConverter();
    }

    private CustomerProtos.Customer customer(int id, String f, String l, Collection<String> emails) {
        String emailAddressString = "defaultEmail@address.com";
        for (String email : emails) {
            emailAddressString = email;
            break;
        }

        EmailAddress emailAddress = CustomerProtos.Customer.EmailAddress.newBuilder()
                .setType(CustomerProtos.Customer.EmailType.PROFESSIONAL).setEmail(emailAddressString).build();

        return CustomerProtos.Customer.newBuilder().setFirstName(f).setLastName(l).setId(id).addEmail(emailAddress)
                // .addAllEmail(emailAddresses)
                .build();
    }

    @Bean
    CustomerRepository customerRepository() {
        return new CustomerRepositoryImpl(); 
    }
}
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这是我的web.xml 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>demo</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>


<servlet>
    <servlet-name>rest</servlet-name>
    <servlet-class>
        org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>rest</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/rest-servlet.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

</web-app>
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这是我的pom.xml,请注意我在这里添加了谷歌protobuf库,他们最终在部署的.war文件的WEB-INF/lib文件夹中. 

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.test</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.0.RELEASE</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <start-class>demo.DemoApplication</start-class>
        <java.version>1.8</java.version>
        <jackson.version>2.5.3</jackson.version>

    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </dependency>
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>2.5.0</version>
        </dependency>
        <dependency>
            <groupId>com.googlecode.protobuf-java-format</groupId>
            <artifactId>protobuf-java-format</artifactId>
            <version>1.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-legacy</artifactId>
            <version>1.0.0.RELEASE</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>
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这是我的测试客户端 

package demo;

import java.util.Arrays;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.IntegrationTest;
import org.springframework.boot.test.SpringApplicationConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.protobuf.ProtobufHttpMessageConverter;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.web.client.RestTemplate;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class DemoApplicationTests {

    @Configuration
    public static class RestClientConfiguration {

        @Bean
        RestTemplate restTemplate(ProtobufHttpMessageConverter hmc) {
            return new RestTemplate(Arrays.asList(hmc));
        }

        @Bean
        ProtobufHttpMessageConverter protobufHttpMessageConverter() {
            return new ProtobufHttpMessageConverter();
        }
    }

    @Autowired
    private RestTemplate restTemplate;

    @Test
    public void contextLoaded() {

        ResponseEntity<CustomerProtos.Customer> customer = restTemplate.getForEntity(
                "http://localhost:7001/demo-0.0.1-SNAPSHOT/ws/customers/2", CustomerProtos.Customer.class);

        System.out.println("customer retrieved: " + customer.toString());

    }

}
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当我使用mvn测试从命令行运行客户端时,我收到以下错误 

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.697 sec <<< FAILURE! - in demo.DemoApplicationTests
contextLoaded(demo.DemoApplicationTests)  Time elapsed: 0.037 sec  <<< ERROR!
org.springframework.web.client.HttpClientErrorException: 406 Not Acceptable
        at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:91)
        at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:641)
        at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:597)
        at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:557)
        at org.springframework.web.client.RestTemplate.getForEntity(RestTemplate.java:289)
        at demo.DemoApplicationTests.contextLoaded(DemoApplicationTests.java:42)
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我看到人们建议使用contentNegotiationManager

在我的rest-servlet.xml中,我有mvc:annotation-driven标签

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans     
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
    <context:component-scan base-package="demo" />
    <mvc:annotation-driven />
  </beans>
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此外,我已经放入了演示包中的webConfig.java 

package demo;

import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {

  /**
    *  Total customization - see below for explanation.
    */
  @Override
  public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
    configurer.favorPathExtension(false).
            favorParameter(true).
            parameterName("mediaType").
            ignoreAcceptHeader(true).
            useJaf(false).
            defaultContentType(MediaType.TEXT_PLAIN).
            mediaType("xml", MediaType.APPLICATION_XML).
            mediaType("json", MediaType.APPLICATION_JSON).
            mediaType("x-protobuf", MediaType.ALL)
            ;
  }
}
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无论是否使用webconfig.java(正在进行contentNegotationManager的工作),我都得到406不可接受的错误.

我无法在Spring 4.1.3甚至4.2.3 jar中找到MediaType.APPLICATION_XPROTOBUF .

所以我把这个值留给了MediaType.ALL(我觉得应该有用吗？)

当我运行测试客户端时,我在实际运行测试之前收到此消息.

09:27:26.198 [main] DEBUG o.s.web.client.RestTemplate - Created GET request for "http://localhost:7001/demo-0.0.1-SNAPSHOT/ws/customers/2"
09:27:26.199 [main] DEBUG o.s.web.client.RestTemplate - Setting request Accept header to [application/x-protobuf, text/plain, application/xml, application/json]
09:27:26.245 [main] DEBUG o.s.web.client.RestTemplate - GET request for "http://localhost:7001/demo-0.0.1-SNAPSHOT/ws/customers/2" resulted in 406 (Not Acceptable); invoking error
handler
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它清楚地显示了它设置接受标题以包含"application-xprotobuf"值.不知道在这种情况下我缺少什么.

ykt*_*too 7

我遇到了与控制器失败相同的问题406: Not Acceptable.经过大量的跟踪后,我想出了示例中的语句:

Spring Boot会自动注册HttpMessageConverterbean,因此我们只需要定义ProtobufHttpMessageConverterbean并对其进行适当的配置.

从字面上理解,因为没有Spring Boot,就不会发生转换器注册.bean 被实例化,但它从未在HttpMessageConverters列表中注册.

我通过显式注册ProtobufHttpMessageConverter实例解决了这个问题:

@Configuration
@EnableWebMvc
@ComponentScan
public class AppConfig extends WebMvcConfigurerAdapter {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(new ProtobufHttpMessageConverter());
        super.configureMessageConverters(converters);
    }
}
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您不需要为它声明一个单独的bean(除非您打算明确地调用它).

另请注意,覆盖configureMessageConverters()会禁用所有标准转换器; 如果您的意思是扩展库存转换器列表而不是替换它,请改写extendMessageConverters().

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