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【默认格式】
public class MyClass implements Serializable{
...}
序列化：
ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(outputPath));
output.writeObject(myObject);
反序列化：
ObjectInputStream input = new ObjectInputStream(new FileInputStream(inputPath));
return (MyClass)input.readObject();
【JSON格式】
使用jackson包。jackson是一个效率非常高的Java JSON包。文档和下载见官网。
序列化：
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(new File(outputPath), myObject);
反序列化：
return mapper.readValue(new File(outputPath), MyClass.class);
【完整测试代码】
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.io.Serializable;
import java.util.ArrayList; import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper; public class Zoo implements Serializable { private static final long serialVersionUID = 1L;
private static ObjectMapper mapper = new ObjectMapper(); public static int maxAnimalCount;
public ArrayList<String> animals; public Zoo() {
animals = new ArrayList<String>();
} public static void setMax(int max){
maxAnimalCount = max;
} /**
* Add an animal to animals Array.
* @param animalName
*/
public void addAnimal(String animalName){
if (animals.size() < maxAnimalCount)
animals.add(animalName);
} @Override
public String toString(){
return "Zoo: \n animals: " + animals.toString() +
"\n maxAnimalCount: " + maxAnimalCount + "\n";
} /**
* Output standard serialization to file at logPath.
* @param logPath
*/
public void serializeToLog(String logPath) {
ObjectOutputStream output = null;
try
{
output = new ObjectOutputStream(
new FileOutputStream(logPath));
output.writeObject(this);
} catch(Exception e) {
e.printStackTrace();
} finally {
try {
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} /**
* Output JSON serialization(using jackson) to file at logPath.
* @param logPath
*/
public void serializeJSONToLog(String logPath){ try {
mapper.writeValue(new File(logPath), this);
} catch (JsonGenerationException e) {
e.printStackTrace();
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} /**
* Standard deserialize a Zoo instance from file at logPath.
* @param logPath
* @return deserialized zoo instance
*/
public static Zoo deserializeFromLog(String logPath) {
ObjectInputStream input = null;
try
{
input =new ObjectInputStream(
new FileInputStream(logPath));
return (Zoo)input.readObject();
} catch(Exception e) {
e.printStackTrace();
} finally {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
} return null;
} /**
* JSON deserialize a Zoo instance from file at logPath.
* @param logPath
* @return JSON deserialized zoo instance
*/
public static Zoo deserializeJSONFromLog(String logPath){
try {
return mapper.readValue(new File(logPath), Zoo.class);
} catch (JsonParseException e) {
e.printStackTrace();
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} return null;
}
} class ZooSerializeTest {
public static void main(String[] args) {
Zoo zoo1 = new Zoo();
Zoo.setMax(100);
zoo1.addAnimal("hamster");
zoo1.addAnimal("sheep"); zoo1.serializeToLog("zoo1.log"); Zoo zoo2 = new Zoo();
Zoo.setMax(200);
zoo2.addAnimal("tiger"); zoo2.serializeToLog("zoo2.log"); Zoo.setMax(300); //Deserialization
zoo1 = Zoo.deserializeFromLog("zoo1.log");
zoo2 = Zoo.deserializeFromLog("zoo2.log"); System.out.println("zoo1: \n" + zoo1);
System.out.println("zoo2: \n" + zoo2); //Serialize to JSON
zoo1.serializeJSONToLog("zoo1.json");
zoo1 = Zoo.deserializeJSONFromLog("zoo1.json"); System.out.println("zoo1 from json: \n" + zoo1);
}
}
注意到默认的serialize会序列化private的属性，不会序列化静态属性；而jackson不会序列化非public的属性和静态属性。