pojo

问题 JAVA 8 I have a POJO class: class User { private String name; private String password; //... Getters / Setters ... } Which i will use as an entity class. In the getter/setter for password , I want to add decryption/encryption logic. public String getPassword() { return EncryptionFactory.decryption(password); } public void setPassword(String password) { this.password = EncryptionFactory.encryption(password); } EncryptionFactory is a utility class which encrypts/decrypt a String . My question

问题 JAVA 8 I have a POJO class: class User { private String name; private String password; //... Getters / Setters ... } Which i will use as an entity class. In the getter/setter for password , I want to add decryption/encryption logic. public String getPassword() { return EncryptionFactory.decryption(password); } public void setPassword(String password) { this.password = EncryptionFactory.encryption(password); } EncryptionFactory is a utility class which encrypts/decrypt a String . My question

问题 Suppose I have one POJO class User with a constuctor public User(int id, String name){...} . But when I instantiate the User object like User u=new User() with no parameter Eclipse gives error like The constructor User() is undefined . But it works fine when I have no parameterized Constructor. Can someone please explain why It requires to define default constructor? 回答1: The default (no-parameter) constructor is ONLY provided if you have provided no others. If you define even a single

问题 In one of our projects we use a java webapp talking to a MongoDB instance. In the database, we use DBRefs to keep track of some object relations. We (de)serialize with POJO objects using jackson (using mongodb-jackson-mapper). However, we use the same POJOs to then (de)serialize to the outside world, where our front end deals with presenting the JSON. Now, we need a way for the serialization for the outside world to contain the referenced object from a DBRef (so that the UI can present the

问题 I am parsing JSON and am having difficulty with one structure that can have one of three forms. In my case it could be zero-dimensional, one-dimensional or two-dimensional. Is there some way I can inspect the JSON on the fly to determine which one it is? Or perhaps consume it anyway and work out what it is afterwards. The structures look like this and can be embedded in other structures. "details":{ "Product":"A zero-dimensional Product" }, "details":{ "Product":"A one-dimensional Product",

问题 given the following json: { "response": { "totalProcessingTime": "271.0", "resultSets": { "products": { "firstHit": "1", "lastHit": "10", "totalHits": "77", "hits": [ { "number": "1", "dmsubcategory": "TV, lyd og bilde", "collection": "tilbud", "title": "<b>TV</b> Panasonic 47 TX-LU 7ET5Y" }, { "number": "2", "dmsubcategory": "TV, lyd og bilde", "collection": "tilbud", "title": "<b>TV</b> Panasonic 47 TX-LU 7ET5Y" }, { "number": "3", "dmsubcategory": "TV, lyd og bilde", "collection": "tilbud"

问题 given the following json: { "response": { "totalProcessingTime": "271.0", "resultSets": { "products": { "firstHit": "1", "lastHit": "10", "totalHits": "77", "hits": [ { "number": "1", "dmsubcategory": "TV, lyd og bilde", "collection": "tilbud", "title": "<b>TV</b> Panasonic 47 TX-LU 7ET5Y" }, { "number": "2", "dmsubcategory": "TV, lyd og bilde", "collection": "tilbud", "title": "<b>TV</b> Panasonic 47 TX-LU 7ET5Y" }, { "number": "3", "dmsubcategory": "TV, lyd og bilde", "collection": "tilbud"

问题 This is somewhat confusing albeit I believe it to be simpler than what I think. I have a class called Commodities and a class called Stops, the stops class takes in an array of commodities. All the items inside stops are parsing correctly and if I inspect the contents of the stops class on the debugger I can see that everything is where it should go. The issue lies in knowing what to get from the adapter that will be used to display the contents from the Stops class and its inner Commodities

问题 I am implementing a REST API which send and receive data with json(I am totally new to this API design). I am using Spring framework and requestbody/responsebody for mapping. Initially, I had a pojo like this: public class Action implements Serializable { @Id private String id; private String name; private String applicationId; private String timeStamp; private String username; private String options; //Getters and Setters } and the json format for this pojo is like this: { "id": "11954cd5

问题 Let's say I have class A with public fields x and y . And let's say I have another pojo class B but that uses setters and getters, so it has setX() and setY(). I'd like to use some automatic way to copy from instance of A to B and back. With default settings at least, Dozer's Mapper mapper = new DozerBeanMapper(); B b = mapper.map(a, B.class); does not copy the fields correctly. So is there a simple configuration change that allows me to accomplish the above with Dozer, or another library