No converter found for return value of type: class java.util.HashMap
SpringMVC 中使用 @ResponseBody 返回Json时,需要手动添加jackson依赖!Maven添加:
<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>
``
不用maven也可以,springMVC-servlet.xml 配置如下
<!-- 启动Springmvc注解驱动 -->
<mvc:annotation-driven/>
<!-- 返回json 方法一 需要导入 fastjson.jar包 -->
<mvc:annotation-driven>
<mvc:message-converters register-defaults="false">
<!-- 避免IE执行AJAX时,返回JSON出现下载文件 -->
<bean id="fastJsonHttpMessageConverter" class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<!-- 这里顺序不能反,一定先写text/html,不然ie下出现下载提示 -->
<value>text/html;charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!-- 返回json 方法二 需要导入 jackson-annotations.jar,jackson-core.jar,jackson-databind.jar-->
<!-- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html; charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html; charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
</list>
</property>
</bean> -->
controller代码:
@RequestMapping(value="/json")
@ResponseBody
public Object getJson(){
Map<String, Object> map=new HashMap<String, Object>();
map.put("fd", "郝鹏");
return map;
}
可以返回map到前端了,如前端则ajax请求,返回数据如data.fd为郝鹏
时间: 2024-10-20 11:12:43