sping中配置json的各种问题

本人搭建的是springboot是4.x版本有时候带来了很多的问题

问题一

在开始我们使用低版本的时候我们配置json返回的时候是这样的

 <!--&lt;!&ndash; https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-core-asl &ndash;&gt;
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-core-asl</artifactId>
            <version>1.9.13</version>
        </dependency>
        &lt;!&ndash; https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-mapper-asl &ndash;&gt;
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.13</version>
        </dependency>-->

这是springmvc.xml的配置文件我们这里的org.springframework.http.converter.json.MappingJacksonHttpMessageConverter这是低版本的

 <!--&lt;!&ndash;配置json解析&ndash;&gt-->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
	<property name="messageConverters">
	<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>
	</property>
</bean>

问题二

我们在配置高版本的时候有时候还是会出现一些问题

 <!--&lt;!&ndash; https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-core-asl &ndash;&gt;
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-core-asl</artifactId>
            <version>1.9.13</version>
        </dependency>
        &lt;!&ndash; https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-mapper-asl &ndash;&gt;
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.13</version>
        </dependency>-->

springmvc.xml 这样的配置还是可能会出现一些问题

 <!--&lt;!&ndash;配置json解析&ndash;&gt;
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
        </property>
    </bean>-->

最终解决方案，可能不是很好，我们通过自己去转，不让sping替我们转了

配置pom文件 这里不需要再spingmvc.里面配置解析json的配置，但是我们还是需要配置基本的配置。

 <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-servlet-api</artifactId>
            <version>9.0.17</version>
        </dependency>

        <!--jackson-->
        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.8</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.8</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.8</version>
        </dependency>

基本的spingmvc.xml的配置

<?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:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-4.3.xsd
      http://www.springframework.org/schema/aop
      http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
      http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">

    <!-- 1.注解扫描位置-->
    <context:component-scan base-package="com.yuxiu.edu.eb.web.controller" />

    <!-- 2.配置映射处理和适配器-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>


    <!-- 3.视图的解析器-->
    <bean
            class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/Modules/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

自己转json的代码和实例

@Controller
@RequestMapping("user")
public class UserController {

    @Autowired
    private IUserService userService;

    @RequestMapping("find")
    @ResponseBody
    public void find(Integer id){
        User user =   userService.findById(id);
        System.out.println("dubbo服务服务的数据:"+user);
        responseJson(user);
    }

	//这里是通过自己的方法。解析方法
    public void responseJson(Object obj){
        HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse();
        response.setHeader("Context-Type","text/json;charset=utf-8");
        ObjectMapper mapper = new ObjectMapper();
        try{
            response.getWriter().write(mapper.writeValueAsString(obj));
        }catch (IOException e){
            e.printStackTrace();
        }
    }
}

标签：mapper,jackson,core,sping,配置,json,org,codehaus,asl
来源： https://blog.csdn.net/qq_28461661/article/details/89086642