这篇文章主要介绍了springmvc json类型转换错误解决方案,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
在用springmvc做json数据时,返回时,提示类型转换错误
如下,
org.springframework.web.util。NestedServletException:请求处理失败;嵌套的异常. lang。IllegalArgumentException:没有发现转换器的返回值类型:类cn.taotao.bean.Role
org.springframework.web.servlet.FrameworkServlet.processRequest (FrameworkServlet.java: 982)
org.springframework.web.servlet.FrameworkServlet.doGet (FrameworkServlet.java: 861)
javax.servlet.http.HttpServlet.service (HttpServlet.java: 634)
org.springframework.web.servlet.FrameworkServlet.service (FrameworkServlet.java: 846)
javax.servlet.http.HttpServlet.service (HttpServlet.java: 741)
org.apache.tomcat.websocket.server.WsFilter.doFilter (WsFilter.java: 52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal (CharacterEncodingFilter.java: 197)
org.springframework.web.filter.OncePerRequestFilter.doFilter (OncePerRequestFilter.java: 107)
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter (ProxiedFilterChain.java: 61)
org.apache.shiro.web.servlet.AdviceFilter.executeChain (AdviceFilter.java: 108)
org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal (AdviceFilter.java: 137)
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter (OncePerRequestFilter.java: 125)
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter (ProxiedFilterChain.java: 66)
org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain (AbstractShiroFilter.java: 449)
org.apache.shiro.web.servlet.AbstractShiroFilter 1.美元调用(AbstractShiroFilter.java: 365)
org.apache.shiro.subject.support.SubjectCallable.doCall (SubjectCallable.java: 90)
org.apache.shiro.subject.support.SubjectCallable.call (SubjectCallable.java: 83)
org.apache.shiro.subject.support.DelegatingSubject.execute (DelegatingSubject.java: 383)
org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal (AbstractShiroFilter.java: 362)
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter (OncePerRequestFilter.java: 125)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate (DelegatingFilterProxy.java: 347)
org.springframework.web.filter.DelegatingFilterProxy.doFilter (DelegatingFilterProxy.java: 263)
根本原因
. lang。IllegalArgumentException:没有发现转换器的返回值类型:类cn.taotao.bean.Role
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters (AbstractMessageConverterMethodProcessor.java: 187)
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue (RequestResponseBodyMethodProcessor.java: 174)
org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue (HandlerMethodReturnValueHandlerComposite.java: 81)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle (ServletInvocableHandlerMethod.java: 113)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod (RequestMappingHandlerAdapter.java: 854)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal (RequestMappingHandlerAdapter.java: 765)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle (AbstractHandlerMethodAdapter.java: 85)
org.springframework.web.servlet.DispatcherServlet.doDispatch (DispatcherServlet.java: 967)
org.springframework.web.servlet.DispatcherServlet.doService (DispatcherServlet.java: 901)
org.springframework.web.servlet.FrameworkServlet.processRequest (FrameworkServlet.java: 970)
org.springframework.web.servlet.FrameworkServlet.doGet (FrameworkServlet.java: 861)
javax.servlet.http.HttpServlet.service (HttpServlet.java: 634)
org.springframework.web.servlet.FrameworkServlet.service (FrameworkServlet.java: 846)
javax.servlet.http.HttpServlet.service (HttpServlet.java: 741)
解决办法为
在pom中添加,只要添加上这两个杰克逊的支持,就可以了。
& lt; dependency>
& lt; groupId> com.fasterxml.jackson.core
& lt; artifactId> jackson-core
& lt; version> 2.8.8
& lt;/dependency>
& lt; !——返回json字符串的支持——比;
& lt; !——https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind——比;
& lt; dependency>
& lt; groupId> com.fasterxml.jackson.core
