java 使用 GSON 给出错误预期为 BEGIN_ARRAY 但为 STRING
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Using GSON giving error expected BEGIN_ARRAY but was STRING
提问by kushaldsouza
An example JSON object is shown below:
下面显示了一个示例 JSON 对象：
[{"Title":"John Doe","Address":{"AddressLines":["The Place","123 New Place","London","England"],"Postcode":"NW7 XXY"},"Telephone":"0012345","Email":"","Latitude":51.5024472101345,"Longitude":-0.557585646554,"Easting":500623,"Northing":179647}]
Suppose the above object is accessed via the link www.domain.com and I have the following class to represent the data
假设通过链接 www.domain.com 访问上述对象，并且我有以下类来表示数据
public class LocationData extends Data{
private Address Address;
private String Telephone;
private String Email;
private String Latitude;
private String Longitude;
private String Easting;
private String Northing;
public Address getAddress() {
return Address;
}
public void setAddress(Address address) {
Address = address;
}
public String getTelephone() {
return Telephone;
}
public void setTelephone(String telephone) {
Telephone = telephone;
}
public String getEmail() {
return Email;
}
public void setEmail(String email) {
Email = email;
}
public String getLatitude() {
return Latitude;
}
public void setLatitude(String latitude) {
Latitude = latitude;
}
public String getLongitude() {
return Longitude;
}
public void setLongitude(String longitude) {
Longitude = longitude;
}
public String getEasting() {
return Easting;
}
public void setEasting(String easting) {
Easting = easting;
}
public String getNorthing() {
return Northing;
}
public void setNorthing(String northing) {
Northing = northing;
}
}
And the address class is as follows:
地址类如下：
public class Address {
public String[] AddressLines;
public String Postcode;
public String getPostcode() {
return Postcode;
}
public void setPostcode(String postcode) {
Postcode = postcode;
}
public String[] getAddressLines() {
return AddressLines;
}
public void setAddressLines(String addressLines[]) {
AddressLines = addressLines;
}
}
When I try to run
当我尝试跑步时
LocationData[] data = gson.fromJson(this.locationServiceUrl, LocationData[].class);
return data;
I get the following error:
我收到以下错误：
Expected BEGIN_ARRAY but was string at the above mentioned line of code. I am not sure if there is something wrong in the manner in which I have set up my classes. Note: I am using an array (LocationData[] data) because the service returns multiple locations although I have just included one in the example shown above. Any help as to why this is happening is much appreciated. I have looked at some of the similar errors on here but none of the fixes provided seem to work for me.
预期 BEGIN_ARRAY 但在上述代码行中是字符串。我不确定我设置课程的方式是否有问题。注意：我使用的是一个数组 (LocationData[] 数据)，因为该服务返回多个位置，尽管我刚刚在上面显示的示例中包含了一个。任何有关为什么会发生这种情况的帮助都非常感谢。我在这里查看了一些类似的错误，但提供的修复程序似乎对我不起作用。
回答by Mohammed Azharuddin Shaikh
{
"finally":[
{
"Title":"John Doe",
"Address": {
"AddressLines":[
"The Place",
"123 New Place",
"London",
"England"
],
"Postcode":"NW7XXY"
},
"Telephone":"0012345",
"Email":"",
"Latitude":51.5024472101345,
"Longitude":-0.557585646554,
"Easting":500623,
"Northing":179647
}
]
}
and code to parse this JSON is :
解析这个 JSON 的代码是：
public class mainData {
public List<LocationData> finally;
public String[] getLocationData() {
return AddressLines;
}
public void setLocationData(List<LocationData> finally) {
this.finally = finally;
}
}
it is because your string starting with [when you parsing this type of Json with Gson then you need to prefix a label to it just i like did ( {"finally": your data }).
这是因为[当你用 Gson 解析这种类型的 Json 时，你的字符串开始，然后你需要在它前面加上一个标签，就像我一样（{"finally": your data }）。
Actually Gson trying to map the label and its value but in your case your [doesnt contain Label by which Gson can map.
实际上 Gson 试图映射标签及其值，但在您的情况下，您[不包含 Gson 可以映射的标签。
