Spring JSON 请求正文未映射到 Java POJO
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Spring JSON request body not mapped to Java POJO
提问by Y. Chen
I'm using Spring to implement a RESTful web service. One of the endpoints takes in a JSON string as request body and I wish to map it to a POJO. However, it seems right now that the passed-in JSON string is not property mapped to the POJO.
我正在使用 Spring 来实现 RESTful Web 服务。其中一个端点将 JSON 字符串作为请求正文，我希望将其映射到 POJO。但是，现在似乎传入的 JSON 字符串不是映射到 POJO 的属性。
here's the @RestController interface
这是@RestController 接口
@RequestMapping(value="/send", headers="Accept=application/json", method=RequestMethod.POST)
public void sendEmails(@RequestBody CustomerInfo customerInfo);
the data model
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;
}
}
And finally my POST request:
最后我的 POST 请求：
{"CustomerInfo":{"firstname":"xyz","lastname":"XYZ"}}
with Content-Type specified to be application/json
内容类型指定为 application/json
However, when I print out the object value, the default value("first" and "last") got printed out instead of the value I passed in("xyz" and "XYZ")
但是，当我打印出对象值时，打印的是默认值（“first”和“last”）而不是我传入的值（“xyz”和“XYZ”）
Does anyone know why I am not getting the result I expected?
有谁知道为什么我没有得到预期的结果？
FIX
使固定
So it turned out that, the value of request body is not passed in because I need to have the @RequestBody annotation not only in my interface, but in the actual method implementation. Once I have that, the problem is solved.
所以事实证明，请求体的值没有传入，因为我不仅需要在我的接口中使用@RequestBody 注释，而且在实际的方法实现中也需要使用 @RequestBody 注释。一旦我有了它，问题就解决了。
采纳答案by Y. Chen
So it turned out that, the value of request body is not passed in because I need to have the @RequestBody annotation not only in my interface, but in the actual method implementation. Once I have that, the problem is solved.
所以事实证明，请求体的值没有传入，因为我不仅需要在我的接口中使用@RequestBody 注释，而且在实际的方法实现中也需要使用 @RequestBody 注释。一旦我有了它，问题就解决了。
回答by DwB
The formatting on this is terrible, but this should work for Hymanson configuration.
这个格式很糟糕，但这应该适用于Hyman逊配置。
<!-- Use Hymanson for JSON conversion (POJO to JSON outbound). -->
<bean id="jsonMessageConverter"
class="org.springframework.http.converter.json.MappingHymanson2HttpMessageConverter"/>
<!-- 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>
ALso, as mentioned in a comment, your JSON is wrong for your object.
另外，如评论中所述，您的 JSON 对于您的对象是错误的。
{"firstname":"xyz",??"lastname":"XYZ"}
does appear to be the correct JSON for your object.
似乎是您对象的正确 JSON。
回答by sanjeevjha
You can do it in many ways, Here i am going to do it in below different ways-
您可以通过多种方式做到这一点，在这里我将通过以下不同的方式做到这一点-
NOTE:request data shuld be {"customerInfo":{"firstname":"xyz","lastname":"XYZ"}}
NOTE:请求数据应该是 {"customerInfo":{"firstname":"xyz","lastname":"XYZ"}}
1st wayWe can bind above data to the map as below
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.
}
2nd waywe can bind it directly to pojo
2nd way我们可以直接绑定到 pojo
step 1create dto class UserInfo.java
step 1创建 dto 类 UserInfo.java
public class UserInfo {
private CustomerInfo customerInfo1;
public CustomerInfo getCustomerInfo1() {
return customerInfo1;
}
public void setCustomerInfo1(CustomerInfo customerInfo1) {
this.customerInfo1 = customerInfo1;
}
}
step 1.create another dto classCustomerInfo.java
step 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;
}
}
step 3bind request body data to pojo
step 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
}
I hope it will be help you out. Thanks
我希望它会帮助你。谢谢
回答by Anil
remove those two statements from default constructor and try
从默认构造函数中删除这两个语句并尝试
回答by Devendra Singraul
Sample Data :
样本数据 ：
[
{
"targetObj":{
"userId":1,
"userName":"Devendra"
}
},
{
"targetObj":{
"userId":2,
"userName":"Ibrahim"
}
},
{
"targetObj":{
"userId":3,
"userName":"Suraj"
}
}
]
For above data this pring controller method working for me:
对于上述数据，此 pring 控制器方法对我有用：
@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.
}
