如何修复流关闭异常
如何修复流关闭异常
提问于 2019-07-25 23:08:14
我正在工作的一个小程序，我可以写一个列表到json文件中，所以我创建了两个实例的经销商类，然后添加到"dealerList“。
我尝试写入名为"Dealer.json“的json文件，因此我从名为"dealerList”的列表中读取对象，然后将其写入json文件。
public class Main {
private static List<Dealer> dealerList = new ArrayList<>();
public static void main(String[] args) {
Dealer dearler = new Dealer("Chevrolet");
dearler.addCartoDealer(new Cars("Camaro","Steve",11000));
dearler.addCartoDealer(new Cars("Coverette","Jhon",22000));
Dealer dearler1 = new Dealer("Ford");
dearler1.addCartoDealer(new Cars("Ford1","Jessie",11000));
dearler1.addCartoDealer(new Cars("Ford2","Smith",22000));
dealerList.add(dearler);
dealerList.add(dearler1);
ObjectMapper mapper = new ObjectMapper();
try(FileOutputStream newFile = new FileOutputStream("Dealer.json")){
for(Dealer dealer:dealerList){
mapper.writeValue(newFile,dealer);
}
} catch (IOException e){
e.printStackTrace();
}
}我得到的堆栈是：
java.io.IOException: Stream Closed
at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:326)
at com.fasterxml.jackson.core.json.UTF8JsonGenerator._flushBuffer(UTF8JsonGenerator.java:2093)
at com.fasterxml.jackson.core.json.UTF8JsonGenerator.close(UTF8JsonGenerator.java:1137)
at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3983)
at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:3245)
at com.Ayoub.Main.main(Main.java:26)我让Stream closed excepetion
Stack Overflow用户
回答已采纳
发布于 2019-07-25 23:15:41
我想杰克逊在调用writeValue之后会自动关闭你的流。您可以通过以下方式关闭此功能：
MessagePackFactory messagePackFactory = new MessagePackFactory();
messagePackFactory.disable(JsonGenerator.Feature.AUTO_CLOSE_TARGET);
ObjectMapper objectMapper = new ObjectMapper(messagePackFactory);不要忘记在某个时间点关闭流;-)
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/57205187
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