控制器中代码

@RequestMapping(value = "/listArea",method = RequestMethod.GET)

@ResponseBody

private Map listArea(){

Map modelMap = new HashMap<>();

List list = areaService.getAreaList();

modelMap.put("rows", list);

modelMap.put("total", list.size());

return modelMap;

}

xml中的使用了这个

pom.xml引入下列依赖

com.fasterxml.jackson.core

jackson-core

2.9.8

com.fasterxml.jackson.core

jackson-annotations

2.9.0

javax.servlet

javax.servlet-api

3.1.0

访问接口时报错

WARN org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - Resolved [org.springframework.http.converter.HttpMessageNotWritableException: No converter found for return value of type: class java.util.HashMap]

DEBUG org.springframework.web.servlet.DispatcherServlet - Completed 500 INTERNAL_SERVER_ERROR