Java 应为BEGIN_对象，但在第1行第2列为BEGIN_数组（小编辑）_Java_Android_Json_Web Services

Java 应为BEGIN_对象，但在第1行第2列为BEGIN_数组（小编辑）

java android json web-services

Java 应为BEGIN_对象，但在第1行第2列为BEGIN_数组（小编辑）,java,android,json,web-services,Java,Android,Json,Web Services,我这里有一个web服务，它为我提供了以下JSON代码： [ { "_OrderDetails": [ { "ProductName": "FUCHS SUPER GT SAE 10W30 6X5 / FP10100010102", "TotalAfterDiscount_Lc": "7500", "MeasureUnitName": "كرتونة", "TotalPrice_Lc": "7500",

我这里有一个web服务，它为我提供了以下JSON代码：

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

我制作了一个java类（实体），其中包含所有数据的getter和setter：

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;
    }

}

}

但我在日志中看到以下例外情况：

应为BEGIN_对象，但在第1行第2列为BEGIN_数组

请问我做错了什么？

查看您的代码，获取

项

对象的正确方法是

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

因为您的JSON是一个

项对象列表[
（BEGIN\u数组）
引发异常，因为Gson需要单个项对象{
（BEGIN\u对象），但它是数组
不能以两种方式反序列化同一个JSON，即数组和对象。如果JSON是数组，则将其反序列化为数组；如果JSON是对象，则将其反序列化为对象，但不能以两种方式反序列化。
JSON输出是一个列表
// This parses your JSON
Item[] items = new Gson().fromJson(responseJson, Item[].class);

在此之后，实际上您将拥有一个项目数组，因为您拥有的是一个对象数组，而不是一个对象。这就是为什么第二行可以工作，第三行不能工作的原因。因此，如果您想将此json解析为一个项目[]placelist，则无需更改任何内容。如果您想将其解析为一个对象，则应删除以下括号：
Item[] placelist;
placelist = gson.fromJson(responseJSON, Item[].class);
Item item = gson.fromJson(responseJSON, Item.class);

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

}
或者像数组一样解析它并检索第一个元素

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

工作正常，并且您有一个项目数组。但是OrderDetails的名称有问题。在json中，它是一个“\u OrderDetails”，在代码中是“OrderDetails”。您可以在字段上添加注释：
@SerializedName("_OrderDetails")
    private List<_OrderDetails> orderDetails;

@SerializedName（“\u OrderDetails”）
私人名单详情；

要测试的完整代码：
import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;

import java.util.Arrays;
import java.util.List;

public class Main {
public static void main(String[] args) {
    String responseJSON = "[\n" +
            "  {\n" +
            "    \"_OrderDetails\": [\n" +
            "      {\n" +
            "         \"ProductName\": \"FUCHS SUPER GT SAE 10W30 6X5 / FP10100010102\",\n" +
            "        \"TotalAfterDiscount_Lc\": \"7500\",\n" +
            "        \"MeasureUnitName\": \"كرتونة\",\n" +
            "        \"TotalPrice_Lc\": \"7500\",\n" +
            "        \"PricePerUnit_Lc\": \"75\",\n" +
            "        \"Quantity\": \"100\"\n" +
            "      }\n" +
            "    ],\n" +
            "    \"Id\": \"274\",\n" +
            "    \"OrderDate\": \"4/10/2014 12:00:00 AM\",\n" +
            "    \"Number\": \"16\",\n" +
            "    \"CustomerName\": \"الأسد\",\n" +
            "    \"Note\": \"\"\n" +
            "  }\n" +
            "]";

    Item[] placelist;
    Gson gson = new Gson();
    placelist = gson.fromJson(responseJSON, Item[].class);
    System.out.println(Arrays.toString(placelist));
}


public class Item {

    private String OrderDate;
    private String Number;
    private String Note;
    private String CustomerName;
    private String Id;
    @SerializedName("_OrderDetails")
    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;
    }

    @Override
    public String toString() {
        return "Item{" +
                "OrderDate='" + OrderDate + '\'' +
                ", Number='" + Number + '\'' +
                ", Note='" + Note + '\'' +
                ", CustomerName='" + CustomerName + '\'' +
                ", Id='" + Id + '\'' +
                ", 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;
        }

        @Override
        public String toString() {
            return "_OrderDetails{" +
                    "OrderId='" + OrderId + '\'' +
                    ", OrderDate='" + OrderDate + '\'' +
                    ", Number='" + Number + '\'' +
                    ", Note='" + Note + '\'' +
                    ", ProductName='" + ProductName + '\'' +
                    ", TotalAfterDiscount_Lc='" + TotalAfterDiscount_Lc + '\'' +
                    ", MeasureUnitName='" + MeasureUnitName + '\'' +
                    ", TotalPrice_Lc='" + TotalPrice_Lc + '\'' +
                    ", PricePerUnit_Lc='" + PricePerUnit_Lc + '\'' +
                    ", Quantity='" + Quantity + '\'' +
                    '}';
        }
    }

}

import com.google.gson.gson；
导入com.google.gson.annotations.SerializedName；
导入java.util.array；
导入java.util.List；
公共班机{
公共静态void main（字符串[]args）{
字符串responseJSON=“[\n”+
“{\n”+
“\”\u OrderDetails\”：[\n”+
“{\n”+
“\'ProductName\：\'FUCHS SUPER GT SAE 10W30 6X5/FP1010000102\'，\n”+
“TotalAfterDiscount\u Lc\”：“7500\”，\n+
“度量单位名称”：“度量单位名称”+
“\'TotalPrice\u Lc\”：\'7500\，\n”+
“\'PricePerUnit\u Lc\”：\'75\，\n”+
“\”数量\“：\”100\“\n”+
“}\n”+
“]，\n”+
“\“Id\：\“274\”，\n”+
“\'OrderDate\'：\'2014年10月4日上午12:00:00\'，\n”+
“\”数字\“：\”16\“，\n”+
“客户名称”：“客户名称”+
“\”注意\“：\”\“\n”+
“}\n”+
"]";
项目[]位置列表；
Gson Gson=新的Gson（）；
placelist=gson.fromJson（responseJSON，Item[].class）；
System.out.println（Arrays.toString（placelist））；
}
公共类项目{
私有字符串OrderDate；
私有字符串编号；
私人弦乐；
私有字符串客户名称；
私有字符串Id；
@SerializedName（“\u OrderDetails”）
私人名单详情；
公共字符串getOrderDate（）{
退货日期；
}
public void setOrderDate（字符串orderDate）{
OrderDate=OrderDate；
}
公共字符串getNumber（）{
返回号码；
}
公共无效集合号（字符串号）{
数字=数字；
}
公共字符串getNote（）{
退货单；
}
公共无效设置注释（字符串注释）{
注=注；
}
公共字符串getId（）{
返回Id；
}
公共无效集合id（字符串id）{
Id=Id；
}
公共字符串getCustomerName（）{
返回客户名称；
}
public void setCustomerName（字符串customerName）{
客户名称=客户名称；
}
公共列表getOrderDetails（）{
退货订单详情；
}
public void setOrderDetails（列出orderDetails）{
this.orderDetails=orderDetails；
}
@凌驾
公共字符串toString（）{
返回“项目{”+
“OrderDate=”+OrderDate+“\”+
“，数字=”“+Number+”\“””+
，Note='+Note+'\''+
“，CustomerName=”“+CustomerName+”\''+
“，Id=”+Id+“\”+
“，orderDetails=“+orderDetails+
'}';
}
公共类_OrderDetails{
私有字符串OrderId；
私有字符串OrderDate；
私有字符串编号；
私人弦乐；
私有字符串产品名称；
私人字符串TotalAfterDiscount\u Lc；
私有字符串MeasureUnitName；
私人字符串TotalPrice_Lc；
私人字符串PricePerUnit\u Lc；
私有字符串数量；
公共字符串getOrderId（）{
返回订单ID；
}
公共无效setOrderId（字符串orderId）{
OrderId=OrderId；
}
公共字符串getOrderDate（）{
退货日期；
}
public void setOrderDate（字符串orderDate）{
OrderDate=OrderDate；
}
公共字符串getNumber（）{
返回号码；
}
公共无效集合号（字符串号）{
数字=数字；
}
公共字符串getNote（）{
退货单；
}
公共无效设置注释（字符串注释）{
注=注；
}
公共字符串getProductName（）{
返回产品名称；
}
公共无效setProductName（字符串productName）{
ProductName=ProductName；
}
公共字符串getTotalAfterDiscount_Lc（）{
返回总折扣(信用证);；
}
public void setTotalAfterDiscount\u Lc（字符串totalAfterDiscount\u Lc）{
TotalAfterDiscount\u Lc=TotalAfterDiscount\u Lc；
}
公共字符串getMeasureUnitName（）{
返回MeasureUnitName；
}
塞特米阿苏公共空间
import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;

import java.util.Arrays;
import java.util.List;

public class Main {
public static void main(String[] args) {
    String responseJSON = "[\n" +
            "  {\n" +
            "    \"_OrderDetails\": [\n" +
            "      {\n" +
            "         \"ProductName\": \"FUCHS SUPER GT SAE 10W30 6X5 / FP10100010102\",\n" +
            "        \"TotalAfterDiscount_Lc\": \"7500\",\n" +
            "        \"MeasureUnitName\": \"كرتونة\",\n" +
            "        \"TotalPrice_Lc\": \"7500\",\n" +
            "        \"PricePerUnit_Lc\": \"75\",\n" +
            "        \"Quantity\": \"100\"\n" +
            "      }\n" +
            "    ],\n" +
            "    \"Id\": \"274\",\n" +
            "    \"OrderDate\": \"4/10/2014 12:00:00 AM\",\n" +
            "    \"Number\": \"16\",\n" +
            "    \"CustomerName\": \"الأسد\",\n" +
            "    \"Note\": \"\"\n" +
            "  }\n" +
            "]";

    Item[] placelist;
    Gson gson = new Gson();
    placelist = gson.fromJson(responseJSON, Item[].class);
    System.out.println(Arrays.toString(placelist));
}


public class Item {

    private String OrderDate;
    private String Number;
    private String Note;
    private String CustomerName;
    private String Id;
    @SerializedName("_OrderDetails")
    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;
    }

    @Override
    public String toString() {
        return "Item{" +
                "OrderDate='" + OrderDate + '\'' +
                ", Number='" + Number + '\'' +
                ", Note='" + Note + '\'' +
                ", CustomerName='" + CustomerName + '\'' +
                ", Id='" + Id + '\'' +
                ", 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;
        }

        @Override
        public String toString() {
            return "_OrderDetails{" +
                    "OrderId='" + OrderId + '\'' +
                    ", OrderDate='" + OrderDate + '\'' +
                    ", Number='" + Number + '\'' +
                    ", Note='" + Note + '\'' +
                    ", ProductName='" + ProductName + '\'' +
                    ", TotalAfterDiscount_Lc='" + TotalAfterDiscount_Lc + '\'' +
                    ", MeasureUnitName='" + MeasureUnitName + '\'' +
                    ", TotalPrice_Lc='" + TotalPrice_Lc + '\'' +
                    ", PricePerUnit_Lc='" + PricePerUnit_Lc + '\'' +
                    ", Quantity='" + Quantity + '\'' +
                    '}';
        }
    }

}

public class Item implements Serializable {
    @SerializedName("_OrderDetails")
    private OrderDetails[] mOrderDetails;

    @SerializedName("Id")
    private String mId;

    @SerializedName("OrderData")
    private String mOrderDate;

    @SerializedName("Number")
    private String mNumber;

    @SerializedName("CustomerName")
    private String mCustomerName;

    @SerializedName("Note")
    private String mNote;

    // Add setters and getters

    public static class OrderDetails implements Serializable {
        @SerializedName("ProductName")
        private String mProductName;

        @SerializedName("TotalAfterDiscount_Lc")
        private String mTotalAfterDiscount;

        @SerializedName("MeasureUnitName")
        private String mMeasureUnitName;

        @SerializedName("TotalPrice_Lc"
        private String mTotalPrice;

        @SerializedName("PricePerUnit_Lc")
        private String mPricePerUnit;

        @SerializedName("Quantity")
        private String mQuantity;

        // Add setters and getters
    }
}

Gson gson = new Gson();
Item item = gson.fromJson(json, Item.class);