@RequestBody获取空值 [英] @RequestBody is getting null values

问题描述

我创建了一个简单的REST服务(POST).但是当我从邮递员@RequestBody调用此服务时，没有收到任何值.

I have created a simple REST service (POST). But when i call this service from postman @RequestBody is not receiving any values.

import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

@RestController
public class Add_Policy {
    @ResponseBody
    @RequestMapping(value = "/Add_Policy", headers = {
            "content-type=application/json" }, consumes = MediaType.APPLICATION_JSON_VALUE, method = RequestMethod.POST)
    public Policy GetIPCountry( @RequestBody Policy policy) {

        System.out.println("Check value: " + policy.getPolicyNumber());
        return policy;

    }


}

我的java Bean对象如下:

My java Bean object is like below:

public class Policy {
    private String PolicyNumber;
    private String Type;
    private String Tenture;
    private String SDate;
    private String HName;
    private String Age;

    public String getPolicyNumber() {
        return PolicyNumber;
    }

    public void setPolicyNumber(String policyNumber) {
        PolicyNumber = policyNumber;
    }

    public String getType() {
        return Type;
    }

    public void setType(String type) {
        Type = type;
    }

    public String getTenture() {
        return Tenture;
    }

System.out.println将空值打印为PolicyNumber的值.

System.out.println is printing a null as a value for PolicyNumber.

请帮助我解决此问题.

JSON是

{
    "PolicyNumber": "123",
    "Type": "Test",
    "Tenture": "10",
    "SDate": "10-July-2016",
    "HName": "Test User",
    "Age": "10"
}

我甚至在邮递员中将Content-Type设置为application/json

I have even set Content-Type to application/json in postman

推荐答案

尝试将JSON中属性的第一个字符设置为小写.例如

Try setting the first character of the properties in your JSON to lower case. Eg.

{
    "policyNumber": "123",
    "type": "Test",
    "tenture": "10",
    "sDate": "10-July-2016",
    "hName": "Test User",
    "age": "10"
}

基本上，Spring使用getter和setter设置bean对象的属性.它采用JSON对象的属性，并将其与同名的setter匹配.例如，要设置policyNumber属性，它将尝试在您的bean类中找到一个名为setpolicyNumber()的setter，然后使用它来设置bean对象的值.

Basically, Spring uses getter and setter to set the properties of the the bean object. And it takes the property of the JSON object, matches it with the setter of the same name. eg to set the policyNumber property it tries to find a setter with the name setpolicyNumber() in your bean class and use that to set the value of your bean object.

这篇关于@RequestBody获取空值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！