序列化对象并将其作为字符串存储在Cookie中

Question

I am java spring mvc developer I have an object and i want to store it in cookie but I dont know how to serialize the object to save it someone can help me? or can suggest other idea to store object in cookie?

Answer 1

Size of a cookie could be max 4Mb. This might not be veryusefull for storing objects. You should consider using HTML5 storage as an alternative.

Answer 2

You can story the object in any String format you want in the cookie.

Build a custom toString() and constructor from String for your object. Write to the cookie ojectToSave.toString() and when reading from the cookie construct objectToLoad = new MyObject(cookieString) .

Example

public class MyObject(){

    private String username;
    private int rank;
    private OtherObject otherObject;

    //Constructors,getters,setters,rest of class
    //...

    public MyObject(String s){
         this();
         //Trim class delimiter (  )
         String trimedStr = s.replaceAll("\(\\$", "").replaceAll("^\)\\", "");

         //parse string
         String[] components = trimedStr.split(",");
         this.username = components[0];
         this.rank     = Integer.valueOf(components[1]);
         //Otherobject should be constructed similar
         this.otherobject = new OtherObject(components[2]);
    }

    public String toString(){
        return "("+username+","+rank+","+otherObject.toString()+")";
    }
 }

I used "(",")" to separate an object, but it is not necessary. If OtherObject contained 2 string values it would look like this:

(radu, 964 , ( string1 , string2 ) )

But if you do not have other objects, you can skip the "(",")" or simply store as just one list

(radu, 964 , string1 , string2 )

and have this.otherobject = new OtherObject(components[2],components[3]);

Use JSON format and Jackson to not have to build the string format yourself (and modify it everytime your change the object class definition)