java - 14 :08:31. 741 [主要]调试org.springframework.web.client.RestTemplate - 响应415 UNSUPPORTED_MEDIA_TYPE

Question

编辑:目前仍然收到此错误: 2019-08-08 15:12:50.876 WARN 3164 --- [io-8080-exec-10] .w.s.m.s.DefaultHandlerExceptionResolver:已解决[org.springframework.web.HttpMediaTypeNotSupportedException:不支持内容类型'']

我不太确定为什么它说不支持内容类型“”... 它也适用于 postman ，但不显示 xml，只显示 json，即使我选择了 application/xml 作为 header 类型

我正在尝试让我的基本 Spring Rest 服务以 XML 进行响应。我已经注释了所有元素并放置了应该接受 XML 的 header 。由于某种原因，我的客户端仍然收到错误“不支持的媒体类型”。

我尝试将 @ResponseBody 放在 EmployeeService 中的方法旁边，但最终给了我一个不同的错误:[org.springframework.web.HttpMediaTypeNotSupportedException: Content type ''不支持]

员工.java

public class Employee implements Serializable {

    @XmlAttribute
    private String id;

    @XmlElement
    private String name;

    @XmlElement
    private String description;
    //private List<Team> teams;


    public Employee() {
        super();
    }

    public Employee(String id, String name, String description) {
        this.id = id;
        this.name = name;
        this.description = description;
        //this.teams = teams;

    }


    @XmlAttribute
    public String getId() {
        return id;
    }
    @XmlAttribute
    public void setId(String id) {
        this.id = id;
    }
    @XmlElement
    public String getName() {
        return name;
    }
    @XmlElement
    public void setName(String name) {
        this.name = name;
    }
    @XmlElement
    public String getDescription() {
        return description;
    }

//  public List<Team> getTeam() {
//      return teams;
//  }
    @XmlElement
    public void setDescription(String description) {
        this.description = description;
    }





    @Override
    public String toString() {
        return String.format(
                "employee [id=%s, name=%s, description=%s]", id,
                name, description);
    }
}

EmployeeController.java

@RestController
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @GetMapping(path = "/employees", produces = {MediaType.APPLICATION_JSON_VALUE, MediaType.APPLICATION_XML_VALUE}, consumes = {MediaType.APPLICATION_JSON_VALUE, MediaType.APPLICATION_XML_VALUE})
    public @ResponseBody HashMap<String, Employee> retrieveEmployees() {
        return employeeService.retrieveAllEmployees();
    }

    @GetMapping(path = "/employees/{employeeId}",produces = {MediaType.APPLICATION_JSON_VALUE, MediaType.APPLICATION_XML_VALUE}, consumes = {MediaType.APPLICATION_JSON_VALUE, MediaType.APPLICATION_XML_VALUE})
    public @ResponseBody Employee retrievebyId(@PathVariable String employeeId) {
        return employeeService.retrieveEmployee(employeeId);
    }

    @PostMapping(path="/employees")
    public ResponseEntity<Void> registeremployee(@RequestBody Employee newemployee) {

        Employee employee = employeeService.addEmployee(newemployee.getId(),newemployee.getName(), newemployee.getDescription());

        if (employee == null)
            return ResponseEntity.noContent().build();

        URI location = ServletUriComponentsBuilder.fromCurrentRequest().path(
                "/{id}").buildAndExpand(employee.getId()).toUri();

        return ResponseEntity.created(location).build();
    }

}

EmployeeService.java

@Component
public class EmployeeService {


    static HashMap<String, Employee> employees = new HashMap<>();





    static {
        //Initialize Data

        Team team1 = new Team("t1", "Java team", "Java Dev Team");

        Employee Joe = new Employee("employee1", "Joe Smith","Human Resources");

        Employee Bob = new Employee("employee2", "Bob Jones",
                "Developer");

        employees.put("employee1", Joe);
        employees.put("employee2", Bob);
    }

    public HashMap<String, Employee> retrieveAllEmployees() {
        return employees;
    }

    public Employee retrieveEmployee(String employeeId) {
        return employees.get(employeeId);
    }
    //private SecureRandom random = new SecureRandom();

    public Employee addEmployee(String id, String name, String description) {

        //String randomId = new BigInteger(130, random).toString(32);
        Employee employee = new Employee(id, name, description);

        employees.put(id, employee);

        return employee;
    }
}

RestClient.java

public class RestClient {

     public static void getJsonEmployee(String id) throws JSONException, IOException {

         String uri = "http://localhost:8080/employees/" + id;



         RestTemplate restTemplate = new RestTemplate();

         HttpHeaders headers = restTemplate.headForHeaders(uri);


         headers.setAccept(Collections.singletonList(MediaType.APPLICATION_XML));


         String result = restTemplate.getForObject(uri, String.class);
         System.out.println(result);

         }




public static void postJsonEmployee(String id, String name, String description) {

    final String uri = "http://localhost:8080/employees/";


    Employee newemp = new Employee(id, name, description);


    RestTemplate restTemplate = new RestTemplate();


    HttpHeaders httpHeaders = restTemplate.headForHeaders(uri);


    httpHeaders.setContentType(MediaType.APPLICATION_XML);


    Employee result = restTemplate.postForObject( uri, newemp, Employee.class);


    httpHeaders.setContentType(MediaType.APPLICATION_XML);


     }

    public static void main(String[] args) throws IOException, JSONException {

     System.out.println("GET or POST?");
     BufferedReader getpost = new BufferedReader(new InputStreamReader(System.in));
     String selection = getpost.readLine();

     switch(selection) {

     case "GET":

     System.out.println("Type in the employee's ID");
     BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
     String employeeid = reader.readLine();
     getJsonEmployee(employeeid);
     break;

     case "POST":

         System.out.println("Type in the employee's ID");
         Scanner scan = new Scanner(System.in);
         String newid = scan.nextLine();
         System.out.println("Type in the employee's name");
         String newname = scan.nextLine();
         System.out.println("Type in the employee's description");
         String newdesc = scan.nextLine();
         postJsonEmployee(newid, newname, newdesc);
         break;

     }
} 

}

10:00:37.986 [main] DEBUG org.springframework.web.client.RestTemplate - HTTP HEAD http://localhost:8080/employees/

10:00:38.293 [main] DEBUG org.springframework.web.client.RestTemplate - Response 415 UNSUPPORTED_MEDIA_TYPE Exception in thread "main"

org.springframework.web.client.HttpClientErrorException$UnsupportedMediaType: 415 null at org.springframework.web.client.HttpClientErrorException.create(HttpClientErrorException.java:95) at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:122) at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:102) at org.springframework.web.client.ResponseErrorHandler.handleError(ResponseErrorHandler.java:63) at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:778) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:736) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:670) at org.springframework.web.client.RestTemplate.headForHeaders(RestTemplate.java:362) at com.client.clientmodel.RestClient.getJsonEmployee(RestClient.java:52) at com.client.clientmodel.RestClient.main(RestClient.java:104)

pom.xml

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.springboot</groupId>
    <artifactId>employee-model</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>employee-model</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>



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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-server</artifactId>
        </dependency>
        <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet</artifactId>
        </dependency>
        <dependency>
        <groupId>org.glassfish.jersey.inject</groupId>
        <artifactId>jersey-hk2</artifactId>
        </dependency>
        <dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-client</artifactId>
        <version>1.8</version>
    </dependency>
    <dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.1</version>
</dependency>
            <dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>1.9.13</version>
</dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>



</project>

Answer 1

405 表示您的客户端发送了错误的请求。您正在客户端中发出 HTTP HEAD 请求。尝试“更新”HttpHeaders。

发送请求后也无法在请求上设置 header 。