java - Jackson2 objectmapper 未将请求映射到对象

Question

调度程序-servlet.xml

        <?xml version="1.0" encoding="UTF-8"?>

    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc.xsd
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">


    <context:component-scan base-package="com.demo" />
    <context:annotation-config />

    <mvc:resources mapping="/resources/**" location="/resources/" cache-period="31556926" />

    <mvc:resources mapping="/images/**" location="/resources/images/" cache-period="31556926" />

    <mvc:resources mapping="/templates/**" location="/resources/templates/" cache-period="31556926" />

    <mvc:annotation-driven/>

    <tx:annotation-driven transaction-manager="txManager" />
    <aop:aspectj-autoproxy />
    <context:property-placeholder location="classpath:database.properties" />


    <bean id="jspViewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${database.driver}"></property>
        <property name="url" value="${database.url}"></property>
        <property name="username" value="${database.user}"></property>
        <property name="password" value="${database.password}"></property>
    </bean>

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="annotatedClasses">
            <list>
                <value>com.demo.model.CompetencyMapping</value>

            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
                <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
            </props>
        </property>
    </bean>

    <bean id="txManager"
        class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"></property>
    </bean>


 <bean
    class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <ref bean="jsonConverter" />
        </list>
    </property>
</bean>

<bean id="jsonConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
   <property name="supportedMediaTypes" value="application/json" />
</bean>
    </beans>

我在 AnnotationMethodHandlerAdapter 中使用了 MappingJackson2HttpMessageConverter。

pom.xml:刚刚添加了 com.fasterxml.jackson.core“databind”和“core”引用

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.demo</groupId>
    <artifactId>pcompui</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>pcompui Maven Webapp</name>
    <url>http://maven.apache.org</url>

    <properties>
        <spring.version>4.0.6.RELEASE</spring.version>
        <hibernate.version>4.1.9.Final</hibernate.version>
        <spring.security.core>3.0.5.RELEASE</spring.security.core>
        <jackson.version>2.8.5</jackson.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <!-- Java Mail API -->
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4.7</version>
        </dependency>


        <!-- joda time -->
        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
            <version>2.4</version>
        </dependency>

        <!-- java servlet -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
        </dependency>

        <!-- jstl jar -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!-- Spring framework -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>



        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>


        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>


        <!-- AOP dependencies -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.1</version>
        </dependency>

        <!-- hibernate dependencies -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.version}</version>
        </dependency>





        <!-- EHCache Core APIs -->
        <!-- <dependency> <groupId>net.sf.ehcache</groupId> <artifactId>ehcache-core</artifactId> 
            <version>2.6.9</version> </dependency> -->

        <!-- EHCache uses slf4j for logging -->
        <!-- <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-simple</artifactId> 
            <version>1.7.5</version> </dependency> -->

        <!--connector jar for db -->
        <dependency>
            <groupId>net.sourceforge.jtds</groupId>
            <artifactId>jtds</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!-- JSON jar -->
        <dependency>
            <groupId>com.metaparadigm</groupId>
            <artifactId>json-rpc</artifactId>
            <version>1.0</version>
        </dependency>

        <!-- Spring Security -->
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-core</artifactId>
            <version>${spring.security.core}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>${spring.security.core}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>${spring.security.core}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-taglibs</artifactId>
            <version>${spring.security.core}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>



        <!-- for logging -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>


        <!-- mysql dependency -->
        <dependency>
           <groupId>mysql</groupId>
           <artifactId>mysql-connector-java</artifactId>
           <version>5.1.17</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.15</version>
        </dependency>

        <!-- JACKSON Dependency -->     
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${jackson.version}</version>
        </dependency>


        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson.version}</version>
        </dependency>


    </dependencies>
    <build>
        <finalName>pcompui</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

现在，当使用 json 发送请求时， Controller 方法不会被调用。如果我删除方法参数“@RequestBody DateRequest systemDate”，该方法将被调用，控制台显示语句。

使用的 Controller 是@RestController

//headers={"Accept=application/json", "Content-Type=application/json"}
    @RequestMapping(value="/retrieveStartandEndDates",method=RequestMethod.POST,consumes={"application/json"} , headers={"Accept=application/json", "Content-Type=application/json"})
    public RetrieveStartEndDates retrieveStartandEndDates(@RequestBody DateRequest systemDate){
        //RetrieveStartEndDates systemDate = new RetrieveStartEndDates();
        System.out.println("inside controller:::"+systemDate.getSystemDate());
        RetrieveStartEndDates obj = new RetrieveStartEndDates();
        obj = schemeService.getStartAndEndDates(systemDate.getSystemDate());
        System.out.println(obj.toString());
        return obj;
    }

DateRequest 是一个简单的 DTO 对象

package com.demo.vo;

public class DateRequest {

    private String SystemDate;
    private String dest;
    public String getSystemDate() {
        return SystemDate;
    }
    public void setSystemDate(String systemDate) {
        this.SystemDate = systemDate;
    }
    public String getDest() {
        return dest;
    }
    public void setDest(String dest) {
        this.dest = dest;
    }

}

JSON 请求

{系统日期:“12/23/2016”，目标:“retrieveStartandEndDates”}

不确定我在这里错过了什么。如有任何建议/帮助，我们将不胜感激。

Answer 1

尝试在dispatcher-servlet.xml中使用org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter而不是org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter。