Java 杰克逊不工作了？_Java_Spring_Spring Mvc_Jackson

Java 杰克逊不工作了？

java spring spring-mvc

Java 杰克逊不工作了？,java,spring,spring-mvc,jackson,Java,Spring,Spring Mvc,Jackson,因此，我有一个spring mvc应用程序，它正在努力实现我的目标。看起来是这样的： import com.jensen.neural.app.MyRequest; import com.jensen.neural.app.NeuralResponse; import com.jensen.neural.app.NumberCruncher; import com.jensen.neural.app.TrainingResults; import org.springframework.bean

因此，我有一个spring mvc应用程序，它正在努力实现我的目标。看起来是这样的：

import com.jensen.neural.app.MyRequest;
import com.jensen.neural.app.NeuralResponse;
import com.jensen.neural.app.NumberCruncher;
import com.jensen.neural.app.TrainingResults;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
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;

@Controller
@RequestMapping("/neural")
public class NeuralController
{
    @Autowired
    NumberCruncher numberCruncher;

    @ResponseBody
    @RequestMapping(value="number", method = RequestMethod.POST, consumes = "application/json")
    public String getNumber(@RequestBody MyRequest myRequest)
    {
        NeuralResponse neuralResponse = new NeuralResponse();
        neuralResponse.setStr("SLDKFJSD");
//      return neuralResponse;
        return "RESPONSE";
    }



    @RequestMapping(value = "train", method = RequestMethod.GET)
    @ResponseBody
    public TrainingResults train()
    {
        return numberCruncher.train();
    }
}

DEBUG: org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver - Resolving exception from handler [public java.lang.String com.jensen.neural.web.NeuralController.getNumber(com.jensen.neural.app.MyRequest)]: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported

我发现：如果我将签名更改为public

public String getNumber（@RequestBody String myRequest）

，那么它发送和接收都很好。如果我发布了一个对象（例如MyRequest），则会出现如下错误：

import com.jensen.neural.app.MyRequest;
import com.jensen.neural.app.NeuralResponse;
import com.jensen.neural.app.NumberCruncher;
import com.jensen.neural.app.TrainingResults;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
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;

@Controller
@RequestMapping("/neural")
public class NeuralController
{
    @Autowired
    NumberCruncher numberCruncher;

    @ResponseBody
    @RequestMapping(value="number", method = RequestMethod.POST, consumes = "application/json")
    public String getNumber(@RequestBody MyRequest myRequest)
    {
        NeuralResponse neuralResponse = new NeuralResponse();
        neuralResponse.setStr("SLDKFJSD");
//      return neuralResponse;
        return "RESPONSE";
    }



    @RequestMapping(value = "train", method = RequestMethod.GET)
    @ResponseBody
    public TrainingResults train()
    {
        return numberCruncher.train();
    }
}

DEBUG: org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver - Resolving exception from handler [public java.lang.String com.jensen.neural.web.NeuralController.getNumber(com.jensen.neural.app.MyRequest)]: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported

如果尝试从控制器返回对象，则会出现以下错误：

DEBUG: org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver - Resolving exception from handler [public com.jensen.neural.app.TrainingResults com.jensen.neural.web.NeuralController.train()]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation

我只能假设我对杰克逊有误解或者其他什么，但我已经让几个人看了这件事，没有人知道到底发生了什么

我的请求：

public class MyRequest
{
    private String input = "";

    public MyRequest()
    {

    }

    public String getInput()
    {
        return input;
    }

    public void setInput(String input)
    {
        this.input = input;
    }
}

神经反应：

public class NeuralResponse
{
    private String str = "";

    public String getStr()
    {
        return str;
    }

    public void setStr(String str)
    {
        this.str = str;
    }
}

servlet上下文：

<?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"
    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/context http://www.springframework.org/schema/context/spring-context.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/" />

    <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
    <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/WEB-INF/views/" />
        <beans:property name="suffix" value=".jsp" />
    </beans:bean>

    <context:component-scan base-package="com.jensen.neural" />



</beans:beans>

pom.xml

<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.jensen</groupId>
    <artifactId>neural</artifactId>
    <name>neural</name>
    <packaging>war</packaging>
    <version>1.0.0-BUILD-SNAPSHOT</version>
    <properties>
        <java-version>1.6</java-version>
        <org.springframework-version>3.1.1.RELEASE</org.springframework-version>
        <org.aspectj-version>1.6.10</org.aspectj-version>
        <org.slf4j-version>1.6.6</org.slf4j-version>
        <jackson-mapper.version>2.1.0</jackson-mapper.version>
    </properties>
    <dependencies>
        <!-- Spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${org.springframework-version}</version>
            <exclusions>
                <!-- Exclude Commons Logging in favor of SLF4j -->
                <exclusion>
                    <groupId>commons-logging</groupId>
                    <artifactId>commons-logging</artifactId>
                 </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>

        <!-- AspectJ -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>${org.aspectj-version}</version>
        </dependency>   

        <!-- Logging -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${org.slf4j-version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>${org.slf4j-version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${org.slf4j-version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.15</version>
            <exclusions>
                <exclusion>
                    <groupId>javax.mail</groupId>
                    <artifactId>mail</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>javax.jms</groupId>
                    <artifactId>jms</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jdmk</groupId>
                    <artifactId>jmxtools</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jmx</groupId>
                    <artifactId>jmxri</artifactId>
                </exclusion>
            </exclusions>
            <scope>runtime</scope>
        </dependency>

        <!-- Jackson JSON Processor -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${jackson-mapper.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson-mapper.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${jackson-mapper.version}</version>
        </dependency>

        <!-- @Inject -->
        <dependency>
            <groupId>javax.inject</groupId>
            <artifactId>javax.inject</artifactId>
            <version>1</version>
        </dependency>

        <!-- Servlet -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!-- Test -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.7</version>
            <scope>test</scope>
        </dependency>        
    </dependencies>
...


4.0.0
com.jensen
神经的
神经的
战争
1.0.0-BUILD-SNAPSHOT
1.6
3.1.1.1发布
1.6.10
1.6.6
2.1.0
org.springframework
spring上下文
${org.springframework版本}
公用记录
公用记录
org.springframework
SpringWebMVC
${org.springframework版本}
org.aspectj
aspectjrt
${org.aspectj版本}
org.slf4j
slf4j api
${org.slf4j版本}
org.slf4j
jcl-over-slf4j
${org.slf4j版本}
运行时
org.slf4j
slf4j-log4j12
${org.slf4j版本}
运行时
log4j
log4j
1.2.15
javax.mail
邮件
javax.jms
jms
com.sun.jdmk
jmxtools
com.sun.jmx
jmxri
运行时
com.fasterxml.jackson.core
杰克逊核心
${jackson mapper.version}
com.fasterxml.jackson.core
杰克逊数据绑定
${jackson mapper.version}
com.fasterxml.jackson.core
杰克逊注释
${jackson mapper.version}
javax.inject
javax.inject
1.
javax.servlet
servlet api
2.5
假如
javax.servlet.jsp
jsp api
2.1
假如
javax.servlet
jstl
1.2
朱尼特
朱尼特
4.7
测试
...

我已经尝试在控制器上设置消费/生产以及其他一些功能。我愿意接受任何建议，请帮助。

因为您使用的是spring版本

3.1.1

和

com.fasterxml.jackson

，您需要

映射Jackson2httpMessageConverter

，它只在3.1.2中引入

升级至

3.1.2

MappingJackson2HttpMessageConverter

bean是使用

annotation-driven

标记隐式创建的

你忘了第一个字母