Question

我需要编写一个休息服务，它接受XML / JSON作为输入（POST方法）和XML / JSON作为输出（基于输入格式）。我尝试过以下方法来实现这一点，但没有帮助.Endpoint方法同时接受XML / JSON但在响应时它总是根据@RequestMapping -produces中指定的顺序提供JSON或XML。任何帮助都将非常感谢

我的终端方法：

@RequestMapping(value = "/getxmljson", method = RequestMethod.POST,produces={"application/json","application/xml"},
        consumes={"application/json", "application/xml"})
public @ResponseBody Student processXMLJsonRequest(@RequestBody Student student)
        throws Exception {
    System.out.println("*************Inside Controller");
    return student;
}

POJO课程：Student.java

import java.io.Serializable;
import java.util.ArrayList;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@XmlRootElement(name = "student")
@XmlType(propOrder = {"id", "name", "graduationTime", "courses"})
@JsonPropertyOrder({"id", "name", "graduationTime", "courses"})
public class Student implements Serializable {
    private static final long serialVersionUID = 1L;

    private int id;
    private String name;
    private String graduationTime;
    private ArrayList<Course> courses = new ArrayList<Course>();

    @XmlElement
    public int getId() { return id; }
    @XmlElement
    public String getName() { return name; }
    @XmlElement
    public String getGraduationTime() { return graduationTime; }
    @XmlElement
    public ArrayList<Course> getCourses() { return courses; }

    public void setId(int value) { this.id = value; }
    public void setName(String value) { this.name = value; }
    public void setGraduationTime(String value) { this.graduationTime = value; }
    public void setCourses(ArrayList<Course> value) { this.courses = value; }

    @JsonIgnore
    public String toString() {
        return this.name + " - "
                + graduationTime == null? "Unknown" : graduationTime.toString();
    }

    public Student() {}
    public Student(int id, String name, String graduationTime) {
        this.id = id;
        this.name = name;
        this.graduationTime = graduationTime;
    }
}

POJO课程：Course.java

import java.io.Serializable;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@XmlRootElement(name = "course")
@XmlType(propOrder = {"courseName", "score"})
@JsonPropertyOrder({"courseName", "score"})
public class Course implements Serializable {
    private static final long serialVersionUID = 1L;

    private String courseName;
    private Integer score;

    public @XmlElement String getCourseName() { return courseName; }
    public @XmlElement Integer getScore() { return score; }

    public void setCourseName(String value) { courseName = value; }
    public void setScore(Integer value) { score = value; }

    public Course() {}
    public Course(String courseName, Integer score) {
        this.courseName = courseName;
        this.score = score;
    }
}

弹簧-config.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:sws="http://www.springframework.org/schema/web-services"
    xmlns:jee="http://www.springframework.org/schema/jee" xmlns:oxm="http://www.springframework.org/schema/oxm"
    xmlns:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/web-services
        http://www.springframework.org/schema/web-services/web-services-2.0.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
            http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
       http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-4.0.xsd
       http://www.springframework.org/schema/util
            http://www.springframework.org/schema/util/spring-util-2.5.xsd">

    <!-- DispatcherServlet Context: defines this servlet's request-processing 
        infrastructure -->

    <!-- Enables the Spring MVC @Controller programming model -->
    <annotation-driven />

    <!-- Handles HTTP GET requests for /resources/** by efficiently serving 
        up static resources in the ${webappRoot}/resources directory -->
    <resources mapping="/resources/**" location="/resources/" />

    <!-- Configure to plugin JSON as request and response in method handler -->
    <beans:bean
        class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <beans:property name="messageConverters">
            <beans:list>
                <beans:ref bean="jsonMessageConverter" />
                <beans:ref bean="xmlMessageConverter" />
            </beans:list>
        </beans:property>
    </beans:bean>

    <!-- Configure bean to convert JSON to POJO and vice versa -->
    <beans:bean id="jsonMessageConverter"
        class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
    </beans:bean>

    <beans:bean id="xmlMessageConverter"
        class="org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter">
    </beans:bean>

    <beans:bean id="restTemplate" class="org.springframework.web.client.RestTemplate">

    </beans:bean>

    <beans:bean id="objectMapper" class="com.fasterxml.jackson.databind.ObjectMapper" />
    <context:component-scan base-package="com.test" />

</beans:beans>

Json输入：

{
"id":2014,
"name":"test",
"graduationtime":"09/05/2014",
"courses":[
{
"courseName":"Math",
"score":150
},
{
"courseName":"Che",
"score":150
}
]
}

XML输入：

<?xml version="1.0" encoding="UTF-8" ?>
<student>
<id>2014</id>
<name>test</name>
<graduationTime>09/05/2014</graduationTime>
<courses>
    <courseName>Math</courseName>
    <score>150</score>
</courses>
<courses>
    <courseName>Che</courseName>
    <score>150</score>
</courses>
</student>

Answer 1

使用同一个控制器处理不同数据格式的最佳实践是让框架完成计算编组和解组机制的所有工作。

第1步：使用最少的控制器配置

@RequestMapping(value = "/getxmljson", method = RequestMethod.POST)
@ResponseBody
public Student processXMLJsonRequest(@RequestBody Student student) {
  return student;
}

此处无需指定consumes和produces。例如，考虑您可能希望将来使用相同的方法处理其他格式，例如Google协议缓冲区，EDI等。保持控制器免于consumes和produces将允许您添加数据通过全局配置格式化，而不必修改控制器代码。

第2步：使用ContentNegotiatingViewResolver代替RequestMappingHandlerAdapter

  <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    <property name="defaultViews">
      <list>
        <bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView"/>
      </list>
    </property>
  </bean>

让视图解析器决定如何读取传入数据以及如何将其写回。

第3步：使用Accepts和Content-Type HTTP标头

使用正确的HTTP标头值命中您的控制器将强制ContentNegotiatingViewResolver使用适当的数据表示法自动编组和解组数据。

如果要以JSON格式交换数据，请将两个标头都设置为application/json。如果您想要XML，请将它们都设置为application/xml。

如果您不想使用HTTP标头（理想情况下应该这样），您只需将.json或.xml添加到网址，ContentNegotiatingViewResolver即可完成剩下的工作。

您可以使用适用于JSON和XML的代码段查看我创建的my sample app。

Answer 2

在上面添加Manish的答案，如果你不想使用基于xml的配置，请使用这个基于java的配置 -

@Bean
public ViewResolver contentNegotiatingViewResolver() {
    ContentNegotiatingViewResolver resolver =
            new ContentNegotiatingViewResolver();

    List<View> views = new ArrayList<>();
    views.add(new MappingJackson2XmlView());
    views.add(new MappingJackson2JsonView());

    resolver.setDefaultViews(views);
    return resolver;
}

Answer 3

注册拦截每个请求的过滤器，将HttpServletRequest变形为HttpServletRequestWrapper的实现，并返回Content-Type标头的Accept值。例如，您可以注册名为SameInSameOutFilter的过滤器，如下所示：

@Component
public class SameInSameOutFilter extends GenericFilterBean {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        SameInSameOutRequest wrappedRequest = new SameInSameOutRequest((HttpServletRequest) request);
        chain.doFilter(wrappedRequest, response);
    }
}

它将当前请求包含在SameInSameOutRequest：

中

public class SameInSameOutRequest extends HttpServletRequestWrapper {
    public SameInSameOutRequest(HttpServletRequest request) {
        super(request);
    }

    @Override
    public String getHeader(String name) {
        if (name.equalsIgnoreCase("accept")) {
            return getContentType();
        }

        return super.getHeader(name);
    }
}

此包装器告诉spring mvc根据请求的HttpMessageConverter值选择Content-Type。如果请求正文的Content-Type为application/xml，则回复将为XML。否则，响应将为JSON。

另一个解决方案是在每个请求中手动设置Accept标题和Content-Type，并避免所有这些黑客攻击。

Answer 4

我遇到了和你一样的问题。以下是我的解决方案和样本。

以下是您需要包含的maven依赖项：

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.4.3</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.4.3</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.4.3</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-xml</artifactId>
            <version>2.4.3</version>
        </dependency>

调度-servlet.xml中

<mvc:annotation-driven
        content-negotiation-manager="contentManager" />

<bean id="contentManager"
        class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
        <property name="favorPathExtension" value="false" />
        <property name="ignoreAcceptHeader" value="false" />
        <property name="defaultContentType" value="application/json" />
        <property name="useJaf" value="false" />
    </bean>

和我的@RequestMapping（您可以使用自己的请求映射）

@RequestMapping(value = "/testXMLJSON",
            method = RequestMethod.GET, produces = {
                    MediaType.APPLICATION_XML_VALUE,
                    MediaType.APPLICATION_JSON_VALUE })
    @ResponseBody
    public ArtworkContentMessageType testXMLJSON()
    {
        //this is GS1 xml standard mapping.
        ArtworkContentMessageType resp = new ArtworkContentMessageType();
        StandardBusinessDocumentHeader standarBusinessDocumentHeader = new StandardBusinessDocumentHeader();
        resp.setStandardBusinessDocumentHeader(standarBusinessDocumentHeader );
        ArtworkContentType artWorkContent = new ArtworkContentType();
        resp.getArtworkContent().add(artWorkContent);

        return resp ;
    }

如果需要application/xml，则必须在标题下方

Content-Type:application/xml
Accept:application/xml

Answer 5

如果资源定义如下

@GET
@Path("/{id}")
@Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
public Student getStudent(@PathParam("id") String  id) {
 return student(); // logic to retunrs student object
}

然后，该请求应包含“ accept”标头（“ application / json”或application / xml”），
然后以json或xml格式返回响应。

样品申请：

curl -k -X GET -H "accept: application/json" "https://172.17.0.5:8243/service/1.0/222"

示例学生班

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;


@XmlRootElement(name = "student")
public class Student {
    private int id;
    private String name;
    private String collegeName;
    private int age;
    @XmlAttribute
    public int getId() {
        return id;
    }

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

    @XmlElement
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    @XmlElement
    public String getCollegeName() {
        return collegeName;
    }

    public void setCollegeName(String collegeName) {
        this.collegeName = collegeName;
    }

    public int getAge() {
        return age;
    }
    @XmlElement
    public void setAge(int age) {
        this.age = age;
    }

}

接受/返回XML / JSON请求和响应 - Spring MVC

5 个答案: