当映射到getter/setter时，使用GSON从POST请求解析json时出错

Question

当向运行Jetty的RESful API发送JSON POST请求时，我正在解析请求中接收到的JSON数据，并尝试将其映射到构造函数类。当接收到的数据不在getter/setter的精确布局中时，问题就会出现。

Vehicle v = new Gson().fromJson(req.getReader(), Vehicle.class);

我希望输出能够正确解析，因为API应该读取每个键并将其映射到getter和setter，这样我就可以访问它了

v.getVehicle_id();

但是，当发送不在getter/setter的确切布局中的JSON数据时。它会导致一个错误，因为它希望第一个输入的值是带整数的“vehicle_id”，而有时它会得到一个不同的值，例如带字符串“black”的“color”。

有没有更好的方法在JSON进入时解析它？我必须使用Gson，因为它是为一个大学作业。

这是我的车

public class Vehicle {

    public Vehicle() {
    }

    /*
     * Maps the database into this class so they can be used in the getter/setter, they are private as other classes don't need access to them
     * This is because they go through the getters/setters, which are public.
     */
    private int vehicle_id;
    private String make;
    private String model;
    private int year;
    private int price;
    private String license_number;
    private String colour;
    private int number_doors;
    private String transmission;
    private int mileage;
    private String fuel_type;
    private int engine_size;
    private String body_style;
    private String condition;
    private String notes;

    public Vehicle(int vehicle_id, String make, String model, int
            year, int price, String license_number, String colour, int
            number_doors, String transmission, int mileage, String fuel_type,
            int engine_size, String body_style, String condition, String
            notes) {

            this.vehicle_id = vehicle_id;
            this.make = make;
            this.model = model;
            this.year = year;
            this.price = price;
            this.license_number = license_number;
            this.colour = colour;
            this.number_doors = number_doors;
            this.transmission = transmission;
            this.mileage = mileage;
            this.fuel_type = fuel_type;
            this.engine_size = engine_size;
            this.body_style = body_style;
            this.condition = condition;
            this.notes = notes;
        }

    /*
     * Creates the getter and setters which map to the database so they can be used by the Controller to store and retrieve data when needed.
     */

    public int getVehicle_id() {
        return vehicle_id;
    }

    public void setVehicle_id(int vehicle_id) {
        this.vehicle_id = vehicle_id;
    }

    public String getMake() {
        return make;
    }

    public void setMake(String make) {
        this.make = make;
    }

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public int getYear() {
        return year;
    }

    public void setYear(int year) {
        this.year = year;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public String getLicense_number() {
        return license_number;
    }

    public void setLicense_number(String license_number) {
        this.license_number = license_number;
    }

    public String getColour() {
        return colour;
    }

    public void setColour(String colour) {
        this.colour = colour;
    }

    public int getNumber_doors() {
        return number_doors;
    }

    public void setNumber_doors(int number_doors) {
        this.number_doors = number_doors;
    }

    public String getTransmission() {
        return transmission;
    }

    public void setTransmission(String transmission) {
        this.transmission = transmission;
    }

    public int getMileage() {
        return mileage;
    }

    public void setMileage(int mileage) {
        this.mileage = mileage;
    }

    public String getFuel_type() {
        return fuel_type;
    }

    public void setFuel_type(String fuel_type) {
        this.fuel_type = fuel_type;
    }

    public int getEngine_size() {
        return engine_size;
    }

    public void setEngine_size(int engine_size) {
        this.engine_size = engine_size;
    }

    public String getBody_style() {
        return body_style;
    }

    public void setBody_style(String body_style) {
        this.body_style = body_style;
    }

    public String getCondition() {
        return condition;
    }

    public void setCondition(String condition) {
        this.condition = condition;
    }

    public String getNotes() {
        return notes;
    }

    public void setNotes(String notes) {
        this.notes = notes;
    }
}

这是我的JSON数据

{"colour":"Black","license_number":"DA98 7BK","body_style":"Small","engine_size":"1","number_doors":"Black","transmission":"manual","year":"2009","price":"10000","make":"Ford","vehicle_id":"8","notes":"Old","fuel_type":"Petrol","condition":"Old","mileage":"20000","model":"Ka"}

这是我从服务器收到的错误

2019-03-28 12:51:41.703:warn:oejs.httpchannel:qtp1225358173-9:/vehicledb/api com.google.gson.jsonSyntaxException：java.lang.NumberFormatException：对于输入字符串：“黑色”

Answer 1

修复了它，我使用了一个hashmap，然后使用gson.toJson将其转换为Json。

我现在正在使用一个构造函数，将我的值添加到它中，然后将它转换为JSON。