不知为什么一直报这个错误：
java.io.EOFException
at java.io.DataInputStream.readFully(+48)
at java.io.DataInputStream.readUTF(+30)
at java.io.DataInputStream.readUTF(+4)
at gesanri.SetCanvas. <init>(+295)
at gesanri.MainCanvas.commandAction(+31)
做一个天气预报，可以保存要显示的城市名称
在增加城市页面，我的rms关键操作如下（其中SetCanvas.cityName是一个Vector，用来保存城市名，在执行此段代码之前，我已经把新增加的城市名添加进了这个Vector
try {
recordstore = RecordStore.openRecordStore("cityStore", true);
} catch (Exception e) {
e.printStackTrace();
}
try {
byte[] outputRecord;
String city = null;
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
DataOutputStream outputDataStream = new DataOutputStream(outputStream);
for(int i = 0; i < SetCanvas.cityName.size(); i++){
city = (String)SetCanvas.cityName.elementAt(i);
outputDataStream.writeUTF(city);
}
outputDataStream.writeInt(SetCanvas.cityName.size());
outputDataStream.flush();
outputRecord = outputStream.toByteArray();
recordstore.setRecord(1,outputRecord, 0, outputRecord.length);
outputStream.reset();
outputStream.close();
outputDataStream.close();
} catch (Exception e) {
e.printStackTrace();
}
try {
recordstore.closeRecordStore();
} catch (Exception e) {
e.printStackTrace();
}
SetCanvas里的rms关键操作如下,这里首先判断了如果是初次运行这个程序，则添加北京、上海、重庆3个城市
try {
recordstore = RecordStore.openRecordStore("cityStore", true);
if(recordstore.getNumRecords() == 0){
byte[] outputRecord;
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
DataOutputStream outputDataStream = new DataOutputStream(outputStream);
outputDataStream.writeUTF("北京");
outputDataStream.writeUTF("上海");
outputDataStream.writeUTF("重庆");
outputDataStream.writeInt(3);
outputDataStream.flush();
outputRecord = outputStream.toByteArray();
recordstore.addRecord(outputRecord, 0, outputRecord.length);
outputStream.reset();
outputStream.close();
outputDataStream.close();
cityName.addElement("北京");
cityName.addElement("上海");
cityName.addElement("重庆");
}
else{
cityName.removeAllElements();
String inputString = null;
int inputInteger = 0;
byte[] byteInputData = new byte[100];
ByteArrayInputStream inputStream = new ByteArrayInputStream(byteInputData);
DataInputStream inputDataStream = new DataInputStream(inputStream);
recordstore.getRecord(1,byteInputData,0);
inputInteger = inputDataStream.readInt();
for(int i = 0; i < inputInteger; i++){
inputString = inputDataStream.readUTF();
cityName.addElement(inputString);
}
inputStream.reset();
inputStream.close();
inputDataStream.close();
}
}catch (Exception e) {
e.printStackTrace();
}
try {
recordstore.closeRecordStore();
} catch (Exception e) {
e.printStackTrace();
}
------解决方法--------------------------------------------------------
//write
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
DataOutputStream outputDataStream = new DataOutputStream(outputStream);
outputDataStream.writeInt(SetCanvas.cityName.size());//先写size
for(int i = 0; i < SetCanvas.cityName.size(); i++){
city = (String)SetCanvas.cityName.elementAt(i);
outputDataStream.writeUTF(city);
}
outputRecord = outputStream.toByteArray();
recordstore.setRecord(1,outputRecord, 0, outputRecord.length);
outputDataStream.close();
//read
ByteArrayInputStream inputStream = new ByteArrayInputStream(byteInputData);
DataInputStream inputDataStream = new DataInputStream(inputStream);
recordstore.getRecord(1,byteInputData,0);
inputInteger = inputDataStream.readInt();
for(int i = 0; i < inputInteger; i++){
inputString = inputDataStream.readUTF();
cityName.addElement(inputString);
}
inputDataStream.close();