有谁能告诉我为什么会出现这个错误?
服务器日志:
StandardWrapperValve[ws_site.ApplicationConfig]: Servlet.service() for servlet ws_site.ApplicationConfig threw exception
java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 5
at com.google.gson.stream.JsonReader.expect(JsonReader.java:339)
at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:322)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:165)
at com.google.gson.Gson.fromJson(Gson.java:791)
Javascript函数,负责捕获填充表单的数据并发送到服务器:
function save()
{
var str_name = $("#name").val();
var str_email = $("#email").val();
var str_country = $("#country").val();
var str_state = $("#state").val();
var str_city = $("#city").val();
var str_zipcode = $("#zipcode").val();
var str_neighborhood = $("#neighborhood").val();
var str_street = $("#street").val();
var str_number = $("#number").val();
var objdata = '{"email_user":"' + str_email + '","name_user":"' + str_name}';
var objlocation = '{"country":"' + str_country + '","state":"' + str_state + '","city":"' + str_city + '","neighborhood":"' + str_neighborhood + '","street":"' + str_street + '","number":"' + str_number + '","zipcode":"' + str_zipcode + '"}';
var obj = '{"user":['+objdata+'],"endereco":['+objlocation+']}';
$.ajax({
headers: {'content-type': 'application/json'},
dataType: 'json',
method: "POST",
url: "http://localhost:8080/SystemExample/webservice/Save/data",
data: obj
}).done(function (data)
{
alert(data);
});
}
Restful Java方法:
@POST
@Path("data")
@Produces(MediaType.TEXT_PLAIN)
@Consumes({MediaType.APPLICATION_JSON})
public String registerUser(Gson json)
{
User u = json.fromJson("user", User.class);
Address a = json.fromJson("endereco", Address.class);
u.setAddress(a);
userDAO.save(u);
return "Saved successfully!";
}
保存userDAO方法:
public void save(User u) {
EntityManager em = JPAUtil.getEntityManager();
EntityTransaction tx = em.getTransaction();
try {
tx.begin();
if (u.getId_User() == null) {
em.persist(u);
} else {
em.merge(u);
}
tx.commit();
} catch (Exception ex) {
ex.printStackTrace();
if (tx != null && tx.isActive()) {
tx.rollback();
}
} finally {
em.close();
}
}
使用Gson将json转换为对象
答案 0 :(得分:2)
你没有向服务器发送一个对象,你只是发送一个字符串:
var obj = '...';
相反,发送一个对象:
var objdata = {
"email_user": str_email,
"name_user": str_name
};
var objlocation = {
"country": str_country,
"state": str_state,
"city": str_city,
"neighborhood": str_neighborhood,
"street": str_street,
"number": str_number,
"zipcode": str_zipcode
};
var obj = {
"user": [objdata],
"endereco": [objlocation]
};
看起来像对象的字符串仍然是字符串。
答案 1 :(得分:1)
objdata没有正确填充为有效的json。试试这个:
function save() {
var str_name = $("#name").val();
var str_email = $("#email").val();
var str_country = $("#country").val();
var str_state = $("#state").val();
var str_city = $("#city").val();
var str_zipcode = $("#zipcode").val();
var str_neighborhood = $("#neighborhood").val();
var str_street = $("#street").val();
var str_number = $("#number").val();
var objdata = '{"email_user":"' + str_email + '","name_user":"' + str_name + '"}';
console.log(objdata);
var objlocation = '{"country":"' + str_country + '","state":"' + str_state + '","city":"' + str_city + '","neighborhood":"' + str_neighborhood + '","street":"' + str_street + '","number":"' + str_number + '","zipcode":"' + str_zipcode + '"}';
console.log(objlocation);
var obj = '{"user":[' + objdata + '],"endereco":[' + objlocation + ']}';
console.log(obj);
$.ajax({
headers: {'content-type': 'application/json'},
dataType: 'json',
method: "POST",
url: "http://localhost:8080/SystemExample/webservice/Save/data",
data: JSON.parse(obj)
}).done(function (data) {
alert(data);
});
}
答案 2 :(得分:0)
在服务器端,您正在尝试绑定JSON
数据。
User u = json.fromJson("user", User.class);
Address a = json.fromJson("endereco", Address.class);
表示user
和endereco
应该是JSON对象,如下所示。
{
"user":{
"email_user":"str_mail","name_user":"nameeee"
},
"endereco":{
"country":"str_country","state":"str_state","city":"str_city","neighborhood":"str_neighborhood","street":"str_street","number":"str_number","zipcode":"str_zipcode"
}
}
但在你的情况下,user
和endereco
实际上是一个JSONArray(见方括号)。
{
"user":[
{
"email_user":"str_mail",
"name_user":"nameeee"
}
],
"endereco":[
{
"country":"str_country",
"state":"str_state",
"city":"str_city",
"neighborhood":"str_neighborhood",
"street":"str_street",
"number":"str_number",
"zipcode":"str_zipcode"
}
]
}
因此改变行
var obj = '{"user":['+objdata+'],"endereco":['+objlocation+']}';
到
var obj = '{"user":'+objdata+',"endereco":'+objlocation+'}';