Java 如何用时间戳数据反序列化包含arraylist的类
我有一个jsonstring,如下所示Java 如何用时间戳数据反序列化包含arraylist的类,java,json,gson,Java,Json,Gson,我有一个jsonstring,如下所示 {"coaList":[{"iD":324,"strName":"Cash","hasChildren":false,"amount":3500.0,"transDate":1421346600000},{"iD":326,"strName":"Cash","hasChildren":false,"amount":2000.0,"transDate":1421346600000},{"iD":328,"strName":"HDFC Bank","hasCh
{"coaList":[{"iD":324,"strName":"Cash","hasChildren":false,"amount":3500.0,"transDate":1421346600000},{"iD":326,"strName":"Cash","hasChildren":false,"amount":2000.0,"transDate":1421346600000},{"iD":328,"strName":"HDFC Bank","hasChildren":false,"amount":2500.0,"transDate":1421346600000}]}
我需要将此字符串转换为CoaAccountList类对象。下面是CoaAccountList类。
CoaAccountList.java:
public class CoaAccountList implements Serializable {
private List<COAAccount> coaList;
public List<COAAccount> getCoaList() {
return coaList;
}
public void setCoaList(List<COAAccount> coaList) {
this.coaList = coaList;
}
}
下面是Coaccount类
coaccount.java:
public class COAAccount implements Serializable {
private int iD;
private String strName;
private boolean hasChildren;
private float amount;
private Timestamp transDate;
public COAAccount() {
super();
// TODO Auto-generated constructor stub
}
public COAAccount(int iD, String strName, boolean hasChildren, float amount, Timestamp transDate) {
super();
this.iD = iD;
this.strName = strName;
this.hasChildren = hasChildren;
this.amount = amount;
this.transDate = transDate;
}
public int getiD() {
return iD;
}
public void setiD(int iD) {
this.iD = iD;
}
public String getStrName() {
return strName;
}
public void setStrName(String strName) {
this.strName = strName;
}
public boolean isHasChildren() {
return hasChildren;
}
public void setHasChildren(boolean hasChildren) {
this.hasChildren = hasChildren;
}
public float getAmount() {
return amount;
}
public void setAmount(float amount) {
this.amount = amount;
}
public Timestamp getTransDate() {
return transDate;
}
public void setTransDate(Timestamp transDate) {
this.transDate = transDate;
}
@Override
public String toString() {
return strName;
}
}
请帮助我将此json字符串转换为CoaAccountList对象。您需要创建一个自定义反序列化方法来解析时间戳 例如:
GsonBuilder builder = new GsonBuilder();
builder.registerTypeAdapter(Timestamp.class, new JsonDeserializer<Timestamp>() {
@Override
public Timestamp deserialize(JsonElement json, Type type, JsonDeserializationContext deserializationContext) throws JsonParseException {
return new Timestamp(json.getAsJsonPrimitive().getAsLong());
}
});
Gson gson = builder.create();
CoaAccountList transHisList = gson.fromJson(jsonString, CoaAccountList.class);
GsonBuilder=newgsonbuilder();
registerTypeAdapter(Timestamp.class,新的JsonDeserializer(){
@凌驾
公共时间戳反序列化(JsonElement json,类型类型,JsonDeserializationContext反序列化Context)引发JsonParseException{
返回新的时间戳(json.getAsJsonPrimitive().getAsLong());
}
});
Gson Gson=builder.create();
coaccountlist transHisList=gson.fromJson(jsonString,coaccountlist.class);
您需要创建一个自定义的反序列化方法来解析时间戳
例如:
GsonBuilder builder = new GsonBuilder();
builder.registerTypeAdapter(Timestamp.class, new JsonDeserializer<Timestamp>() {
@Override
public Timestamp deserialize(JsonElement json, Type type, JsonDeserializationContext deserializationContext) throws JsonParseException {
return new Timestamp(json.getAsJsonPrimitive().getAsLong());
}
});
Gson gson = builder.create();
CoaAccountList transHisList = gson.fromJson(jsonString, CoaAccountList.class);
GsonBuilder=newgsonbuilder();
registerTypeAdapter(Timestamp.class,新的JsonDeserializer(){
@凌驾
公共时间戳反序列化(JsonElement json,类型类型,JsonDeserializationContext反序列化Context)引发JsonParseException{
返回新的时间戳(json.getAsJsonPrimitive().getAsLong());
}
});
Gson Gson=builder.create();
coaccountlist transHisList=gson.fromJson(jsonString,coaccountlist.class);
您需要创建一个自定义的反序列化方法来解析时间戳
例如:
GsonBuilder builder = new GsonBuilder();
builder.registerTypeAdapter(Timestamp.class, new JsonDeserializer<Timestamp>() {
@Override
public Timestamp deserialize(JsonElement json, Type type, JsonDeserializationContext deserializationContext) throws JsonParseException {
return new Timestamp(json.getAsJsonPrimitive().getAsLong());
}
});
Gson gson = builder.create();
CoaAccountList transHisList = gson.fromJson(jsonString, CoaAccountList.class);
GsonBuilder=newgsonbuilder();
registerTypeAdapter(Timestamp.class,新的JsonDeserializer(){
@凌驾
公共时间戳反序列化(JsonElement json,类型类型,JsonDeserializationContext反序列化Context)引发JsonParseException{
返回新的时间戳(json.getAsJsonPrimitive().getAsLong());
}
});
Gson Gson=builder.create();
coaccountlist transHisList=gson.fromJson(jsonString,coaccountlist.class);
您需要创建一个自定义的反序列化方法来解析时间戳
例如:
GsonBuilder builder = new GsonBuilder();
builder.registerTypeAdapter(Timestamp.class, new JsonDeserializer<Timestamp>() {
@Override
public Timestamp deserialize(JsonElement json, Type type, JsonDeserializationContext deserializationContext) throws JsonParseException {
return new Timestamp(json.getAsJsonPrimitive().getAsLong());
}
});
Gson gson = builder.create();
CoaAccountList transHisList = gson.fromJson(jsonString, CoaAccountList.class);
GsonBuilder=newgsonbuilder();
registerTypeAdapter(Timestamp.class,新的JsonDeserializer(){
@凌驾
公共时间戳反序列化(JsonElement json,类型类型,JsonDeserializationContext反序列化Context)引发JsonParseException{
返回新的时间戳(json.getAsJsonPrimitive().getAsLong());
}
});
Gson Gson=builder.create();
coaccountlist transHisList=gson.fromJson(jsonString,coaccountlist.class);
在需要使用自定义反序列化模式的情况下,Gson允许您根据类型注册自己的反序列化代码
要做到这一点,您首先需要从GsonBuilder中实例化Gson,而不是使用以下代码:
GsonBuilder gson = new GsonBuilder();
然后,在处理类型时间戳
时,需要将JsonDeserializer
实例附加到GsonBuilder
中,如下所示:
gson.registerTypeAdapter(Timestamp.class, new GsonTimestampDeserializer());
注意:GsonTimestampDeserializer
是我们在下面创建的一个自定义类,从技术上讲,您可以随意命名它
在注册自定义反序列化程序时,当Gson需要从原始类型(int、string、double等)转换为指定的注册类型时,它将根据需要从JsonDeserializer接口自动调用deserialize()方法。为了利用这一点,我们实现了如下反序列化程序:
private class GsonTimestampDeserializer implements JsonDeserializer<Timestamp>{
public Timestamp deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException{
return new Timestamp(json.getAsJsonPrimitive().getAsLong());
}
}
私有类GsonTimestampDeserializer实现JsonDeserializer{
公共时间戳反序列化(JsonElement json,类型typeOfT,JsonDeserializationContext)引发JsonParseException{
返回新的时间戳(json.getAsJsonPrimitive().getAsLong());
}
}
注意:我假设您正在使用java.sql中的Timestamp对象,它提供了一个耗时很长的构造函数
总而言之:
GsonBuilder gson = new GsonBuilder();
gson.registerTypeAdapter(Timestamp.class, new GsonTimestampDeserializer());
private class GsonTimestampDeserializer implements JsonDeserializer<Timestamp>{
public Timestamp deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException{
return new Timestamp(json.getAsLong());
}
}
Gson gsonInstance = gson.create();
CoaAccountList transHisList = gsonInstance.fromJson(jsonString, CoaAccountList.class);
GsonBuilder gson=new GsonBuilder();
registerTypeAdapter(Timestamp.class,新的GsonTimestampDeserializer());
私有类GsonTimestampDeserializer实现JsonDeserializer{
公共时间戳反序列化(JsonElement json,类型typeOfT,JsonDeserializationContext)引发JsonParseException{
返回新的时间戳(json.getAsLong());
}
}
Gson gsonInstance=Gson.create();
CoaAccountList transHisList=gsonInstance.fromJson(jsonString,CoaAccountList.class);
当Gson解析JSON字符串并尝试填充相应的值时,它会在transDate上遇到时间戳
类型,而不是使用java提供的默认对象反序列化方案,而是使用我们提供的自定义反序列化方案将long转换为时间戳对象
该方法可以推广到各种复杂的容器类,这些容器类可以将其数据存储为单个基元类型,同样地,可以使用Gson序列化程序来实现相反的效果。在需要使用自定义反序列化模式的情况下,Gson允许您根据类型注册自己的反序列化代码 要做到这一点,您首先需要从GsonBuilder中实例化Gson,而不是使用以下代码:
GsonBuilder gson = new GsonBuilder();
然后,在处理类型时间戳
时,需要将JsonDeserializer
实例附加到GsonBuilder
中,如下所示:
gson.registerTypeAdapter(Timestamp.class, new GsonTimestampDeserializer());
注意:GsonTimestampDeserializer
是我们在下面创建的一个自定义类,从技术上讲,您可以随意命名它
在注册自定义反序列化程序时,当Gson需要从原始类型(int、string、double等)转换为指定的注册类型时,它将根据需要从JsonDeserializer接口自动调用deserialize()方法。为了利用这一点,我们实现了如下反序列化程序:
private class GsonTimestampDeserializer implements JsonDeserializer<Timestamp>{
public Timestamp deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException{
return new Timestamp(json.getAsJsonPrimitive().getAsLong());
}
}
私有类GsonTimestampDeserializer实现JsonDeserializer{
公共时间戳反序列化(JsonElement json,类型typeOfT,JsonDeserializationContext)引发JsonParseException{
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