8.0w+
社区成员
关于ObjectMapper json转对象的问题，在线等。。。
UserCar：
UserCarList:
测试代码：
异常：
{"userCar":[{"cardNo":"1234","isDefault":"1"}]}
WARN :[11/02 21:11:07,463] com.cyberway.goparking.user.controller.UserController(qtp4089278-22); :发生异常
com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.String out of START_OBJECT token
at [Source: {"userCar":[{"cardNo":"1234","isDefault":"1"}]}; line: 1, column: 13] (through reference chain: com.cyberway.goparking.utils.UserCarList["userCar"]->java.util.ArrayList[0])
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)
at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:854)
at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:62)
at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:11)
at com.fasterxml.jackson.databind.ObjectMapper._readValue(ObjectMapper.java:3703)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2006)
at com.fasterxml.jackson.core.JsonParser.readValueAs(JsonParser.java:1506)
at com.cyberway.platform2.support.hibernate.type.json.jackson.HibernateEntityDeserializer.deserialize(HibernateEntityDeserializer.java:22)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:245)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:217)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:25)
at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:520)
at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:95)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:256)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:125)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3731)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2724)
at com.cyberway.goparking.user.controller.UserController.listJson(UserController.java:417)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:111)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:806)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:729)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:594)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1366)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316)
at com.cyberway.platform2.security.core.web.DataInitFilter.doFilterInternal(DataInitFilter.java:76)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at com.cyberway.platform2.security.core.web.RequestInterceptor.doFilterInternal(RequestInterceptor.java:51)
at com.cyberway.platform2.support.web.filter.AbstractFilter.doFilter(AbstractFilter.java:28)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at com.cyberway.platform2.user.services.OnlineUserServiceImpl.doFilterInternal(OnlineUserServiceImpl.java:127)
at com.cyberway.platform2.support.web.filter.AbstractFilter.doFilter(AbstractFilter.java:28)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:149)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91)
按照网上方法做的 一直行不通。但用JsonObject就行 谁能告诉我哪里错了。谢谢了 弄了一天了
每次走到这一步就报错： UserCarList userCarList = objectMapper.readValue(str, UserCarList.class);
package com.cyberway.goparking.user.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
import com.cyberway.platform2.support.orm.model.BusinessEntityWithOrganization;
import com.cyberway.platform2.user.model.MemberUser;
/**
* 用户车牌表
* @author yyzhou
* @version v1.0
*/
@Entity
@Table(name = "GP_UserCar")
@Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL)
public class UserCar extends BusinessEntityWithOrganization{
private static final long serialVersionUID = -1465239840030123090L;
/**
* 用户Id
*/
@ManyToOne(targetEntity = MemberUser.class, fetch = FetchType.LAZY)
@JoinColumn(name = "userId", referencedColumnName = "id")
private MemberUser memberUser;
/**
* 车牌号
*/
@Column
private String cardNo;
/**
* 是否首选(默认为 false)
*/
@Column
private Boolean isDefault = false;
/**
* 是否关闭(1：关闭，0：开启)
*/
@Column
private Boolean hasDeleted = true;
public MemberUser getMemberUser() {
return memberUser;
}
public void setMemberUser(MemberUser memberUser) {
this.memberUser = memberUser;
}
public Boolean getIsDefault() {
return isDefault;
}
public void setIsDefault(Boolean isDefault) {
this.isDefault = isDefault;
}
public Boolean getHasDeleted() {
return hasDeleted;
}
public void setHasDeleted(Boolean hasDeleted) {
this.hasDeleted = hasDeleted;
}
public String getCardNo() {
return cardNo;
}
public void setCardNo(String cardNo) {
this.cardNo = cardNo;
}
}
UserCarList:
package com.cyberway.goparking.utils;
import java.util.List;
import com.cyberway.goparking.user.model.UserCar;
public class UserCarList {
private List<UserCar> userCar;
public List<UserCar> getUserCar() {
return userCar;
}
public void setUserCar(List<UserCar> userCar) {
this.userCar = userCar;
}
}
测试代码：
/**
* List测试
*/
@RequestMapping(value = "/listJson")
public @ResponseBody Object listJson(HttpServletRequest request,String userId) throws Exception
{
String str = URLDecoder.decode(request.getParameter("parm"),"UTF-8");
System.out.println(str);
List<UserCar> list = null;
UserCar userCar = null;
UserCarList userCarList = objectMapper.readValue(str, UserCarList.class);
List<UserCar> uc = userCarList.getUserCar();
return new DataResult("xx");
}
异常：
{"userCar":[{"cardNo":"1234","isDefault":"1"}]}
WARN :[11/02 21:11:07,463] com.cyberway.goparking.user.controller.UserController(qtp4089278-22); :发生异常
com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.String out of START_OBJECT token
at [Source: {"userCar":[{"cardNo":"1234","isDefault":"1"}]}; line: 1, column: 13] (through reference chain: com.cyberway.goparking.utils.UserCarList["userCar"]->java.util.ArrayList[0])
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)
at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:854)
at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:62)
at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:11)
at com.fasterxml.jackson.databind.ObjectMapper._readValue(ObjectMapper.java:3703)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2006)
at com.fasterxml.jackson.core.JsonParser.readValueAs(JsonParser.java:1506)
at com.cyberway.platform2.support.hibernate.type.json.jackson.HibernateEntityDeserializer.deserialize(HibernateEntityDeserializer.java:22)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:245)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:217)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:25)
at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:520)
at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:95)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:256)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:125)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3731)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2724)
at com.cyberway.goparking.user.controller.UserController.listJson(UserController.java:417)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:111)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:806)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:729)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:594)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1366)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316)
at com.cyberway.platform2.security.core.web.DataInitFilter.doFilterInternal(DataInitFilter.java:76)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at com.cyberway.platform2.security.core.web.RequestInterceptor.doFilterInternal(RequestInterceptor.java:51)
at com.cyberway.platform2.support.web.filter.AbstractFilter.doFilter(AbstractFilter.java:28)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at com.cyberway.platform2.user.services.OnlineUserServiceImpl.doFilterInternal(OnlineUserServiceImpl.java:127)
at com.cyberway.platform2.support.web.filter.AbstractFilter.doFilter(AbstractFilter.java:28)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:149)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91)
按照网上方法做的 一直行不通。但用JsonObject就行 谁能告诉我哪里错了。谢谢了 弄了一天了
每次走到这一步就报错： UserCarList userCarList = objectMapper.readValue(str, UserCarList.class);
...全文
当前发帖距今超过3年，不再开放新的回复
发表回复
执笔记忆的空白 2015-11-03
objectMapper 这是个什么东东
sinat_31535993 2015-11-03
这样看carNo这不是成一个对象了？
科學信仰 2015-11-03
看上去这格式是符合规范的？如果是这样，那肯定是其它什么地方有问题，可能哦，还缺少一些类型的映射信息
longbaopyl 2015-11-03
String str="{\"studentList\":[{\"id\":\"leilei\",\"name\":\"23\"},{\"id\":\"leilei02\",\"name\":\"23\"}]}";
List<Student> list = new ArrayList<Student>();
Student stu=new Student();
Student stu2=new Student();
stu.setId("1");
stu.setName("jack");
stu2.setId("2");
stu2.setName("rose");
list.add(stu);
list.add(stu2);
StudentList students=new StudentList();
students.setStudents(list);
ObjectMapper objectMapper=new ObjectMapper();
String json2 = objectMapper.writeValueAsString(students);
System.out.println(json2);
System.out.println(str);
StudentList studentList=objectMapper.readValue(json2, StudentList.class);
List<Student> lists=studentList.getStudents();
for(Student s:lists){
System.out.println(s.getName()+" "+s.getId());
}
longbaopyl 2015-11-03
估计是你的str有问题，但是我没看出来，贴上上面代码的执行结果
{"students":[{"id":"1","name":"jack"},{"id":"2","name":"rose"}]}
{"studentList":[{"id":"leilei","name":"23"},{"id":"leilei02","name":"23"}]}
jack 1
rose 2
yiyuzhou00 2015-11-02
{"carNo":[{"cardNo":"1234","isDefault":"1"}]}
这是str内容
科學信仰 2015-11-02
打印出来检查下参数str的内容是不是符合转化为UserCarList 的标准呢？
使用ObjectMapper框架进行json转换所需jar包和实例 使用ObjectMapper框架进行json转换所需jar包和实例，使用ObjectMapper框架进行json转换所需jar包和实例
ObjectMapper json转对象 还有一个是如果不是一般的类型，比如我要转换的类里面包括一个ObjectMapper类，一直报错，最后发现把它变成static即可，如下 package com.example.demo.util; import ...
Jackson之ObjectMapper json字符串转对象，转list java中json 的String 可用于测试 String json = "[{\"supplierId\":\"1158\",\"supplierNum\":\"460\",\"supplierName\":\"工厂460-5-腾达\"}, +"{\"supplierId\":\"1158\",\"supplierNum\":\"460\",\"supplierName...
ObjectMapper json转java 对象避免异常报错；json对象多，java对象少 import com.fasterxml.jackson.databind.ObjectMapper;...ObjectMapper mapper=new ObjectMapper(); //处理异常 mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); ...
ObjectMapper将json转对象报错处理 在使用ObjectMapper将json转对象，调用mapper.readValue(jsonStr, XwjUser.class)时，报如下错： ...
ObjectMapper 对于JSON与Java对象之间的转换使用 在项目中使用到了ObjectMapper，故研究了一下。现将自己的几个测试用例和大家分享一下~ 首先在pom.xml文件中，加入依赖： <dependency> <groupId>com.fasterxml.jackson.core</groupId> &...
使用ObjectMapper对java对象和Map进行json格式转换 依赖包 1.jackson-core-asl-1.9.13.jar 2.jackson-mapper-asl-1.9.13.jar public class Test { public static void main(String[] args) throws Exception ... ObjectMapper o = new ObjectMapper(); Student s...
利用ObjectMapper转换json和对象 将对象转成你想要的对象，除了JSONObject.parseObject外，可以用ObjectMapper 1、添加jackson库 如果是maven工程，需要在pom.xml中添加jackson的依赖： <dependency> <groupId&...
ObjectMapper操作Json对象 ObjectMapper 操作Json对象 一、 根据Json 获取json中的某一个值 步骤 1. ObjectMapper 对象的 readTree(String json) 方法 传入一个解析过后的json字符串就可以将其解析为树类型 2. 获取树对象之后就可以进行遍历...
利用ObjectMapper进行对象与JSON互相转化 简介: Jackson是一个流行的基于Java的JSON处理框架 ...学习参考: Json转换利器Gson之实例 系列,顺便也学习一下...本篇简介如何使用Jackson进行Java对象与JSON的互相转换 新建基本Student类: package com.jingshou.pojo;
ObjectMapper json转换时间+8 ObjectMapper json转换时间+8 ObjectMapper.readValue 方法转换json中的时间时，时间自动加了8个小时；解决方法： @JsonFormat注解中的timezone属性设置为： GMT+8
objectmapper 嵌套json转对象报错 objectmapper 嵌套json转对象报错，是因为实体类对象没有加无参构造器 1、对于没有构造函数的java类，编译器会为其提供一个默认的无参构造函数；2、如果显示的为类提供了构造函数，编译器就不会再给提供默认构造...
java中用ObjectMapper类实现Json与bean的转换示例 主要给大家介绍了关于在java中用ObjectMapper类实现Json与bean转换的相关资料，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，需要的朋友们下面跟着小编来一起学习学习吧。
使用ObjectMapper转换JSON 文章目录maven 依赖使用场景测试model类使用场景实例1、Java对象转换为JSON对象2、JSON对象转换为Java对象3、Java数组对象和JSON数组对象转换4、抽取json中的部分数据进行转换 ObjectMapper 是一个使用 Swift 编写的...
ObjectMapper-将java对象转为json字符串 ObjectMapper可以实现Java对象和json字符串间互相转换，我们经常用到的是它的Java对象转json字符串功能。 Java对象和json字符串间的相互转换： 【json字符串转为Java对象：readValue(UserString,class类)】 ...
ObjectMapper对象(json格式转换) 1 ObjectMapper对象 1.1 springMVC与json交互 ...3、将对象转成json串：@ResponseBody 1.2 注解实现的原理 ObjectMapper：实现json串与对象间相互转换 1.3 结果 1、将对象与json之间完成转换：
使用objectmapper将json转list，json转复杂类型 List returnBookResults = mapper.readValue(JSON.toJSONString(response.getData()),new TypeReference(){}); 方法2： JavaType javaType = mapper.getTypeFactory().constructParametricType(ArrayList.class....
