Java内容重新整理删除过期的东西

Java/JavaDemo/codedemo/java/lang/serialization/Man.java

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+package cn.aofeng.demo.java.lang.serialization;
+
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+
+/**
+ * 自定义序列化和反序列化。
+ * 
+ * @author <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+public class Man implements Externalizable {
+
+    private String manName;
+    
+    private int manAge;
+    
+    private transient String password;
+
+    public Man() {
+        // nothing
+    }
+    
+    public Man(String name, int age) {
+        this.manName = name;
+        this.manAge = age;
+    }
+    
+    public Man(String name, int age, String password) {
+        this.manName = name;
+        this.manAge = age;
+        this.password = password;
+    }
+    
+    public String getManName() {
+        return manName;
+    }
+
+    public void setManName(String manName) {
+        this.manName = manName;
+    }
+
+    public int getManAge() {
+        return manAge;
+    }
+
+    public void setManAge(int manAge) {
+        this.manAge = manAge;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    @Override
+    public void writeExternal(ObjectOutput out) throws IOException {
+        out.writeObject(manName);
+        out.writeInt(manAge);
+        out.writeObject(password);
+    }
+
+    @Override
+    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
+        manName = (String) in.readObject();
+        manAge = in.readInt();
+        password = (String) in.readObject();
+    }
+
+}

Java/JavaDemo/codedemo/java/lang/serialization/People.java

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+package cn.aofeng.demo.java.lang.serialization;
+
+import java.io.Serializable;
+
+/**
+ * 默认序列化和
+ * 
+ * @author <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+public class People implements Serializable {
+
+    private static final long serialVersionUID = 6235620243018494633L;
+
+    private String name;
+    
+    private int age;
+    
+    private transient String address;
+    
+    private static String sTestNormal;
+    
+    private static transient String sTestTransient;
+
+    public People(String name) {
+        this.name = name;
+    }
+    
+    public People(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+    
+    public People(String name, int age, String address) {
+        this.name = name;
+        this.age = age;
+        this.address = address;
+    }
+    
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(String address) {
+        this.address = address;
+    }
+
+    public String getsTestNormal() {
+        return sTestNormal;
+    }
+
+    public void setsTestNormal(String sTestNormal) {
+        People.sTestNormal = sTestNormal;
+    }
+
+    public String getsTestTransient() {
+        return sTestTransient;
+    }
+
+    public void setsTestTransient(String sTestTransient) {
+        People.sTestTransient = sTestTransient;
+    }
+
+}

Java/JavaDemo/codedemo/java/lang/serialization/TransientDemo.java

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+package cn.aofeng.demo.java.lang.serialization;
+
+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 org.apache.commons.io.IOUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * 关键字 transient 测试。
+ * 
+ * @author <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+public class TransientDemo {
+
+    private static Logger _logger = LoggerFactory.getLogger(TransientDemo.class);
+    
+    private String _tempFileName = "TransientDemo";
+    
+    /**
+     * 将对象序列化并保存到文件。
+     * 
+     * @param obj 待序列化的对象
+     */
+    public void save(Object obj) {
+        ObjectOutputStream outs = null;
+        try {
+            outs = new ObjectOutputStream(
+                    new FileOutputStream( getTempFile(_tempFileName) ));
+            outs.writeObject(obj);
+        } catch (IOException e) {
+            _logger.error("save object to file occurs error", e);
+        } finally {
+            IOUtils.closeQuietly(outs);
+        }
+    }
+    
+    /**
+     * 从文件读取内容并反序列化成对象。
+     * 
+     * @return {@link People}对象。如果读取文件出错 或 对象类型转换失败，返回null。
+     */
+    public <T> T load() {
+        ObjectInputStream ins = null;
+        try {
+            ins = new ObjectInputStream(
+                    new FileInputStream( getTempFile(_tempFileName)) );
+            return ((T) ins.readObject());
+        } catch (IOException e) {
+            _logger.error("load object from file occurs error", e);
+        } catch (ClassNotFoundException e) {
+            _logger.error("load object from file occurs error", e);
+        } finally {
+            IOUtils.closeQuietly(ins);
+        }
+        
+        return null;
+    }
+    
+    private File getTempFile(String filename) {
+        return new File(getTempDir(), filename);
+    }
+    
+    private String getTempDir() {
+        return System.getProperty("java.io.tmpdir");
+    }
+    
+    private void displayPeople(People people) {
+        if (null == people) {
+            return;
+        }
+        String template = "People[name:%s, age:%d, address:%s, sTestNormal:%s, sTestTransient:%s]";
+        System.out.println( String.format(template, people.getName(), people.getAge(), 
+                people.getAddress(), people.getsTestNormal(), people.getsTestTransient()));
+    }
+    
+    private void displayMan(Man man) {
+        if (null == man) {
+            return;
+        }
+        String template = "Man[manName:%s, manAge:%d, password:%s]";
+        System.out.println( String.format(template, man.getManName(), man.getManAge(), man.getPassword()) );
+    }
+    
+    /**
+     * @param args
+     */
+    public static void main(String[] args) {
+        System.out.println(">>> Serializable测试");
+        TransientDemo demo = new TransientDemo();
+        
+        People people = new People("张三", 30, "中国广州");
+        people.setsTestNormal("normal-first");
+        people.setsTestTransient("transient-first");
+        System.out.println("序列化之前的对象信息：");
+        demo.displayPeople(people);
+        demo.save(people);
+        
+        // 修改静态变量的值
+        people.setsTestNormal("normal-second");
+        people.setsTestTransient("transient-second");
+        
+        People fromLoad = demo.load();
+        System.out.println("反序列化之后的对象信息：");
+        demo.displayPeople(fromLoad);
+        
+        
+        
+        System.out.println("");
+        System.out.println(">>> Externalizable测试");
+        Man man = new Man("李四", 10, "假密码");
+        System.out.println("序列化之前的对象信息：");
+        demo.displayMan(man);
+        demo.save(man);
+        
+        Man manFromLoadMan = demo.load();
+        System.out.println("反序列化之后的对象信息：");
+        demo.displayMan(manFromLoadMan);
+    }
+
+}