预计BEGIN_OBJECT但在第1行第2列是BEGIN_ARRAY(很少编辑)

Question

我在这里有一个Web服务,它给了我以下JSON代码:

[
  {
    "_OrderDetails": [
      {
         "ProductName": "FUCHS SUPER GT SAE 10W30 6X5 / FP10100010102",
        "TotalAfterDiscount_Lc": "7500",
        "MeasureUnitName": "??????",
        "TotalPrice_Lc": "7500",
        "PricePerUnit_Lc": "75",
        "Quantity": "100"
      }
    ],
    "Id": "274",
    "OrderDate": "4/10/2014 12:00:00 AM",
    "Number": "16",
    "CustomerName": "?????",
    "Note": ""
  }
]

我已经为所有数据创建了一个带有getter和setter的java类(实体):

package com.example.webservicetest;

import java.util.List;

public class Item {

private String OrderDate;
private String Number;
private String Note;
private String CustomerName;
private String Id;
private List<_OrderDetails> orderDetails;



public String getOrderDate() {
    return OrderDate;
}
public void setOrderDate(String orderDate) {
    OrderDate = orderDate;
}
public String getNumber() {
    return Number;
}
public void setNumber(String number) {
    Number = number;
}
public String getNote() {
    return Note;
}
public void setNote(String note) {
    Note = note;
}

public String getId() {
    return Id;
}
public void setId(String id) {
    Id = id;
}
public String getCustomerName() {
    return CustomerName;
}
public void setCustomerName(String customerName) {
    CustomerName = customerName;
}
public List<_OrderDetails> getOrderDetails() {
    return orderDetails;
}
public void setOrderDetails(List<_OrderDetails> orderDetails) {
    this.orderDetails = orderDetails;
}
public class _OrderDetails{
    private String OrderId;
    private String OrderDate;
    private String Number;
    private String Note;
    private String ProductName;
    private String TotalAfterDiscount_Lc;
    private String MeasureUnitName;
    private String TotalPrice_Lc;
    private String PricePerUnit_Lc;
    private String Quantity;
    public String getOrderId() {
        return OrderId;
    }
    public void setOrderId(String orderId) {
        OrderId = orderId;
    }
    public String getOrderDate() {
        return OrderDate;
    }
    public void setOrderDate(String orderDate) {
        OrderDate = orderDate;
    }
    public String getNumber() {
        return Number;
    }
    public void setNumber(String number) {
        Number = number;
    }
    public String getNote() {
        return Note;
    }
    public void setNote(String note) {
        Note = note;
    }
    public String getProductName() {
        return ProductName;
    }
    public void setProductName(String productName) {
        ProductName = productName;
    }
    public String getTotalAfterDiscount_Lc() {
        return TotalAfterDiscount_Lc;
    }
    public void setTotalAfterDiscount_Lc(String totalAfterDiscount_Lc) {
        TotalAfterDiscount_Lc = totalAfterDiscount_Lc;
    }
    public String getMeasureUnitName() {
        return MeasureUnitName;
    }
    public void setMeasureUnitName(String measureUnitName) {
        MeasureUnitName = measureUnitName;
    }
    public String getTotalPrice_Lc() {
        return TotalPrice_Lc;
    }
    public void setTotalPrice_Lc(String totalPrice_Lc) {
        TotalPrice_Lc = totalPrice_Lc;
    }
    public String getPricePerUnit_Lc() {
        return PricePerUnit_Lc;
    }
    public void setPricePerUnit_Lc(String pricePerUnit_Lc) {
        PricePerUnit_Lc = pricePerUnit_Lc;
    }
    public String getQuantity() {
        return Quantity;
    }
    public void setQuantity(String quantity) {
        Quantity = quantity;
    }

}

}

并在主要活动我得到这样的数据:

Item[] placelist;
placelist = gson.fromJson(responseJSON, Item[].class);
Item item = gson.fromJson(responseJSON, Item.class);

但我在logcat中遇到以下异常: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2

请问我做错了什么？

Answer 1

看你的代码,让你以正确的方式item对象是

Item[] placelist = gson.fromJson(responseJSON, Item[].class);    

因为你的JSON是一个item对象列表[(BEGIN_ARRAY)

Item item = gson.fromJson(responseJSON, Item.class);    

抛出异常,因为GSON期待一个单个项目对象{(BEGIN_OBJECT),但是一个数组.

你无法反序列相同的JSON两种方式,为数组和对象,如果你的JSON是一个数组,反序列化是一个数组,如果你JSON是一个对象反序列化作为对象,但你不能在这两个方面反序列化.