3

我知道，这在stackoverflow上反复弹出。不幸的是，提供的解决方案都没有解决我的问题。

我试图让我的服务器使用杰克逊消息转换器以最简单的方式响应 JSON 格式的数据。

我的配置：

我的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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.mycompany</groupId>
    <artifactId>whatever</artifactId>
    <name>whatever</name>
    <packaging>war</packaging>
    <version>1.0.0-BUILD-SNAPSHOT</version>
    <properties>
        <java-version>1.7</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>
    </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>

        ...

        <!-- Jackson Mapper for JSON response -->
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.5</version>
        </dependency>

        ...   
    </dependencies>
    <build>
       ...
    </build>
</project>

jackson-mapper-asl-1.9.5.jar并且jackson-core-asl-1.9.5.jar在构建路径上。

我的/whatever/src/main/webapp/WEB-INF/spring/appServlet/servlet-context.xml：

<?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 -->

    <context:component-scan base-package="com.mycompany.whatever" />
    <annotation-driven />

    ...

</beans:beans>

我的控制器：

package com.mycompany.whatever;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class AParticularUserController implements UserController {
    @RequestMapping(value = "/demo/sayhello/{name}", method = RequestMethod.GET)
    public @ResponseBody GreeterDemo sayHello(@PathVariable String name) {
        return new GreeterDemo(name);
    }
}

GreeterDemo是一个非常简单的Demo类：

package com.mycompany.whatever;

public class GreeterDemo {
    private String name;

    public GreeterDemo(String name) {
        this.name = name;
    }

}

当我对我的开发服务器（Tomcat v7.0）发出 GET 请求时，http://localhost:8080/whatever/demo/sayhello/SomeName我总是收到错误消息：

HTTP 状态 406 -

类型状态报告

信息

描述 此请求标识的资源只能生成具有根据请求“接受”标头不可接受的特征的响应。

Apache Tomcat/7.0.37

请求参数似乎是正确的：

Accept:application/json
Accept-Charset:UTF-8,*;q=0.5
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-GB,en;q=0.8,de-DE;q=0.6,de;q=0.4,fr-FR;q=0.2,fr;q=0.2
Connection:keep-alive
Host:localhost:8080
User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.70 Safari/537.17

分别

Accept:*/*
Accept-Charset:UTF-8,*;q=0.5
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-GB,en;q=0.8,de-DE;q=0.6,de;q=0.4,fr-FR;q=0.2,fr;q=0.2
Connection:keep-alive
Host:localhost:8080
User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.70 Safari/537.17

有任何想法吗...？

4

1 回答 1

5

问题是该GreeterDemo类型缺少 getter（基于对问题的评论中的讨论），并且 Jackson 拒绝接受它作为可以转换为 json 的有效类型，一旦添加了 getter，转换为 json 就会按预期进行。

于 2013-02-20T19:19:02.960 回答