Few days before as per requirement, need to build a class that serialized an object and store in a file and later should be retrieved through de-serialized process.
As per requirement, every Save Button clicked bean object should be serialized in a file and on Load Button click all persisted object could be back to JListBox.When i started this stuff then serialization are working file and store on the files But when Click on a Load Button then throws an exception.
then i did google on web after spending some time,i screw it in some other ways myself which is given below,this is fit for our requirement and working good.
java.io.StreamCorruptedException: invalid type code: AC
HostPersistor.Java class is responsible to take a HostInfo bean and serialized and de-serialized.
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.Set;
import com.bean.HostInfo;
public class HostPersistor {
static Map<String,HostInfo> HostInfoMap = new Hashtable<String,HostInfo>();
public static void write(HostInfo obj) {
FileOutputStream fout = null;
ObjectOutputStream objout = null;
try {
File file = new File("HOST_SESSION_HISTORY.ser");
if (!file.exists()) {
file.createNewFile();
}
fout = new FileOutputStream(file);
if (!HostInfoMap.containsKey(obj)) {
HostInfoMap.put(obj.getIpaddress(),obj);
objout = new ObjectOutputStream(fout);
for (Map.Entry<String,HostInfo> info : HostInfoMap.entrySet()) {
objout.writeObject(info.getValue());
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (objout != null)
objout.close();
if (fout != null)
fout.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private static Set<String> readObject() {
FileInputStream fin = null;
ObjectInputStream objin = null;
try {
File file = new File("HOST_SESSION_HISTORY.ser");
objin = new ObjectInputStream(new FileInputStream(file));
while (true) {
try {
HostInfo info = (HostInfo) objin.readObject();
HostInfoMap.put(info.getIpaddress(),info);
} catch (Exception e) {
break;
}
}
} catch (IOException e) {
} finally {
try {
if (objin != null)
objin.close();
if (fin != null)
fin.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return HostInfoMap.keySet();
}
public static Set<String> getHostInfos() {
return readObject();
}
public static List<String> getHosts(){
List<String> list = new ArrayList<String>();
list.addAll(getHostInfos());
Collections.sort(list);
return list;
}
public static void main(String args[]) throws IOException {
HostInfo info1 = new HostInfo("xxxx", "xx", "xxx", 22);
HostInfo info2 = new HostInfo("aaaa", "aaaa", "aaa", 22);
HostInfo info3 = new HostInfo("yyyyy", "yyy", "yyyy", 22);
write(info1);
write(info2);
write(info3);
for(String info : getHostInfos()){
System.out.println(info);
}
//System.out.println(getHosts());
}
public static Map<String, HostInfo> getHostInfoMap() {
return HostInfoMap;
}
public static void setHostInfoMap(Map<String, HostInfo> hostInfoMap) {
HostInfoMap = hostInfoMap;
}
}
HostInfo.Java bean which describe host information.
import java.io.Serializable;
import java.util.Stack;
/**
* @author ajaykumar.gupta
*
*/
public final class HostInfo implements Serializable,Comparable<HostInfo> {
private static final long serialVersionUID = 6243919138889562890L;
private String ipaddress;
private String username;
private String password;
private String pwd;
private Stack<String> cmdList = new Stack<String>();
private int port;
public HostInfo(String ipaddress, String username, String password, int port) {
this.ipaddress = ipaddress;
this.username = username;
this.password = password;
this.port = port;
cmdList.add(this.username+"@"+this.ipaddress);
}
public String getIpaddress() {
return ipaddress;
}
public void setIpaddress(String ipaddress) {
this.ipaddress = ipaddress;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public Stack<String> getCmdList() {
return cmdList;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("HostInfo [ipaddress=");
builder.append(ipaddress);
builder.append(", username=");
builder.append(username);
builder.append(", password=");
builder.append(password);
builder.append(", port=");
builder.append(port);
builder.append(", pwd=");
builder.append(pwd);
builder.append(", cmdList=");
builder.append(cmdList);
builder.append("]");
return builder.toString();
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result
+ ((ipaddress == null) ? 0 : ipaddress.hashCode());
result = prime * result + port;
result = prime * result
+ ((username == null) ? 0 : username.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
HostInfo other = (HostInfo) obj;
if (ipaddress == null) {
if (other.ipaddress != null)
return false;
} else if (!ipaddress.equals(other.ipaddress))
return false;
if (port != other.port)
return false;
if (username == null) {
if (other.username != null)
return false;
} else if (!username.equals(other.username))
return false;
return true;
}
@Override
public int compareTo(HostInfo o) {
return this.ipaddress.compareTo(o.ipaddress);
}
}
