使用GSON给错误预期BEGIN_ARRAY但STRING [英] Using GSON giving error expected BEGIN_ARRAY but was STRING
问题描述
这是例子JSON对象，如下所示：
[{标题：李四，地址：{AddressLines：世贸天阶，123新的地方，伦敦，英伦]，邮报code：NW7 XXY"},"Telephone":"0012345","Email":"","Latitude":51.5024472101345,"Longitude":-0.557585646554,"Easting":500623,"Northing":179647}]
假设上述目的是通过链接www.domain.com访问，我有下面的类重新present数据
公共类LocationData扩展数据{
私有地址地址;
私人字符串电话;
私人字符串电子邮件;
私人字符串纬度;
私人字符串经度;
私人字符串东距;
私人字符串北向;
公共地址的getAddress（）{
退货地址;
}
公共无效setAddress（地址地址）{
地址=地址;
}
公共字符串getTelephone（）{
回电话;
}
公共无效setTelephone（字符串电话）{
电话=电话;
}
公共字符串getEmail（）{
返回电子邮件;
}
公共无效setEmail（字符串电子邮件）{
电子邮件=电子邮件;
}
公共字符串getLatitude（）{
返回纬度;
}
公共无效setLatitude（字符串纬度）{
纬度=纬度
}
公共字符串getLongitude（）{
返回经度;
}
公共无效setLongitude（字符串经度）{
经度=经度
}
公共字符串getEasting（）{
返回东距;
}
公共无效setEasting（字符串东向）{
东距=东距;
}
公共字符串getNorthing（）{
返回北向;
}
公共无效setNorthing（字符串北距）{
北距=北距;
}
}
和地址类如下：
公共类地址{
公众的String [] AddressLines;
公共字符串邮报code;
公共字符串的getPost code（）{
回邮报code;
}
公共无效setPost code（字符串后code）{
帖子code =交code;
}
公众的String [] getAddressLines（）{
返回AddressLines;
}
公共无效setAddressLines（字符串addressLines []）{
AddressLines = addressLines;
}
}
当我尝试运行
LocationData []数据= gson.fromJson（this.locationServiceUrl，LocationData []类。）;
返回的数据;
我收到以下错误：
预计BEGIN_ARRAY但串在上述行code。我不知道，如果有什么不对的，其中我已经建立了我的课的方式。注：我使用的是阵列（LocationData []数据），因为该服务将返回多个位置，虽然我刚才包括一名在上面的例子。任何帮助，为什么发生这种情况是非常AP preciated。我看过一些类似的错误在这里，但没有提供修复程序似乎为我工作。
{
最后：[
{
标题：李四，
地址： {
AddressLines：[
世贸天阶，
123新的地方，
伦敦，
英国
]
邮报code：NW7XXY
}，
电话：0012345，
电子邮件：，
纵横：51.5024472101345，
经度： - 0.557585646554，
东向：500623，
北向：179647
}
]
}
和code解析此JSON是：
公共类mainData {
公开名单＆LT; LocationData＆GT;最后;
公众的String [] getLocationData（）{
返回AddressLines;
}
公共无效setLocationData（名单＆LT; LocationData＆GT;最后）{
this.finally =最后;
}
}
那是因为你的字符串开头 [当你解析这种类型的Json与GSON的，那么你需要preFIX一个标签，它只是我喜欢没有（ {终于：你的数据} ）。
其实GSON试图映射标签和它的价值，但在你的情况你的 [犯规含有标签由GSON可以映射。
An example JSON object is shown below:
[{"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
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:
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
LocationData[] data = gson.fromJson(this.locationServiceUrl, LocationData[].class);
return data;
I get the following error:
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.
{
"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 :
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 }).
Actually Gson trying to map the label and its value but in your case your [ doesnt contain Label by which Gson can map.
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