Spring JSON请求主体未映射到Java POJO
我正在使用Spring实现一个RESTful web服务。其中一个端点接收JSON字符串作为请求体,我希望将其映射到POJO。然而,现在看来传入的JSON字符串并没有映射到POJO的属性 这是@RestController接口Spring JSON请求主体未映射到Java POJO,java,json,spring,spring-mvc,jackson,Java,Json,Spring,Spring Mvc,Jackson,我正在使用Spring实现一个RESTful web服务。其中一个端点接收JSON字符串作为请求体,我希望将其映射到POJO。然而,现在看来传入的JSON字符串并没有映射到POJO的属性 这是@RestController接口 @RequestMapping(value="/send", headers="Accept=application/json", method=RequestMethod.POST) public void sendEmails(@RequestBody Custome
@RequestMapping(value="/send", headers="Accept=application/json", method=RequestMethod.POST)
public void sendEmails(@RequestBody CustomerInfo customerInfo);
数据模型
public class CustomerInfo {
private String firstname;
private String lastname;
public CustomerInfo() {
this.firstname = "first";
this.lastname = "last";
}
public CustomerInfo(String firstname, String lastname)
{
this.firstname = firstname;
this.lastname = lastname;
}
public String getFirstname(){
return firstname;
}
public void setFirstname(String firstname){
this.firstname = firstname;
}
public String getLastname(){
return lastname;
}
public void getLastname(String lastname){
this.lastname = lastname;
}
}
最后是我的发帖请求:
{"CustomerInfo":{"firstname":"xyz","lastname":"XYZ"}}
将内容类型指定为application/json
但是,当我打印出对象值时,打印出的是默认值(“first”和“last”),而不是我传入的值(“xyz”和“xyz”)
有人知道为什么我没有得到我期望的结果吗
修复
结果是,没有传入请求体的值,因为我不仅需要在接口中,而且需要在实际的方法实现中使用@RequestBody注释。一旦我有了它,问题就解决了。这上面的格式很糟糕,但这应该适用于jackson配置
<!-- Use Jackson for JSON conversion (POJO to JSON outbound). -->
<bean id="jsonMessageConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
<!-- Use JSON conversion for messages -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="jsonMessageConverter"/>
</list>
</property>
</bean>
确实是您的对象的正确JSON。您可以通过多种方式来实现,这里我将用以下不同的方式来实现-
{"firstname":"xyz","lastname":"XYZ"}
注意:
请求数据应该是{“customerInfo”:{“firstname”:“xyz”,“lastname”:“xyz”}
1st-way
我们可以将上述数据绑定到地图,如下所示
@RequestMapping(value = "/send", headers = "Accept=application/json", method = RequestMethod.POST)
public void sendEmails(@RequestBody HashMap<String, HashMap<String, String>> requestData) {
HashMap<String, String> customerInfo = requestData.get("customerInfo");
String firstname = customerInfo.get("firstname");
String lastname = customerInfo.get("lastname");
//TODO now do whatever you want to do.
}
步骤1。
创建另一个dto类CustomerInfo.java
class CustomerInfo {
private String firstname;
private String lastname;
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
}
步骤3
将请求正文数据绑定到pojo
@RequestMapping(value = "/send", headers = "Accept=application/json", method = RequestMethod.POST)
public void sendEmails(@RequestBody UserInfo userInfo) {
//TODO now do whatever want to do with dto object
}
我希望它能帮助你。感谢从默认构造函数中删除这两条语句,然后尝试,结果是,请求主体的值没有传入,因为我不仅需要在接口中,而且需要在实际的方法实现中使用@RequestBody注释。一旦有了这些,问题就解决了。示例数据:
[
{
"targetObj":{
"userId":1,
"userName":"Devendra"
}
},
{
"targetObj":{
"userId":2,
"userName":"Ibrahim"
}
},
{
"targetObj":{
"userId":3,
"userName":"Suraj"
}
}
]
对于以上数据,此弹簧控制器方法适用于我:
@RequestMapping(value="/saveWorkflowUser", method = RequestMethod.POST)
public void saveWorkflowUser (@RequestBody List<HashMap<String ,HashMap<String ,
String>>> userList ) {
System.out.println(" in saveWorkflowUser : "+userList);
//TODO now do whatever you want to do.
}
@RequestMapping(value=“/saveWorkflowUser”,method=RequestMethod.POST)
public void saveWorkflowUser(@RequestBody List userList){
System.out.println(“in-saveWorkflowUser:+userList”);
//现在做你想做的事。
}
如果你将json展平,会怎么样:{“firstname”:“xyz”,“lastname”:“xyz”}
Hi@mszymborski,我已经试过了,但也没用。使用了默认构造函数。请尝试在@RequestMapping
中使用consumes
属性,而不是使用标题。问题不在于Jackson,那么-raw ObjectMapper在展平版本中工作得很好。Hi@11thdimension,也尝试过了。没有帮助。非常感谢您提供了非常详细的答案。您建议的所有方法都可以实现转换。虽然它们不是我问题的解决方案,但我仍然很高兴了解所有这些。有没有办法将其简单地绑定到方法参数名,而不是引入新的java类或将其任意映射到键值对的映射?
@RequestMapping(value="/saveWorkflowUser", method = RequestMethod.POST)
public void saveWorkflowUser (@RequestBody List<HashMap<String ,HashMap<String ,
String>>> userList ) {
System.out.println(" in saveWorkflowUser : "+userList);
//TODO now do whatever you want to do.
}