package com.stono.sboot2_chp4_jackson.controller;

import com.fasterxml.jackson.annotation.JsonAnyGetter;

import com.fasterxml.jackson.annotation.JsonView;

import com.fasterxml.jackson.databind.JavaType;

import com.fasterxml.jackson.databind.ObjectMapper;

import com.stono.sboot2_chp4_jackson.entity.User;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestBody;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import java.io.IOException;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

@Controller

public class DataBindController {

    @Qualifier("getObjectMapper")

    @Autowired

    ObjectMapper objectMapper;

    @RequestMapping("/updateUsers.json")

    @ResponseBody

    public String updateUsers(@RequestBody List<User> list) {

        StringBuilder builder = new StringBuilder();

        for (User user : list) {

            builder.append(user.getName()).append(" ");

        }

        return builder.toString();

    }

    @RequestMapping("/customize.json")

    @ResponseBody

    public String costomize() throws IOException {

        String jsonInput = "[{\"name\":\"stono\",\"id\":1},{\"name\":\"tom\",\"id\":2}]";

        JavaType type = getCollectionType(List.class, User.class);

        List<User> users = objectMapper.readValue(jsonInput, type);

        return String.valueOf(users.size());

    }

    public JavaType getCollectionType(Class<?> collectionClass, Class<?>... elementClasses) {

        return objectMapper.getTypeFactory().constructParametricType(collectionClass, elementClasses);

    }

    @JsonView(User.IdView.class)

    @RequestMapping("/id.json")

    @ResponseBody

    public User queryIds() {

        User user = new User();

        user.setId(1);

        user.setName("stono");

        return user;

    }

    @RequestMapping("/user.json")

    @ResponseBody

    public User user() {

        User user = new User();

        user.setId(1);

        user.setName("stono");

        return user;

    }

    @RequestMapping("/dept.json")

    @ResponseBody

    public Department getDepartment() {

        return new Department(1);

    }

    class Department{

        Map map = new HashMap();

        private int id;

        public Department(int id) {

            this.id = id;

            map.put("newAttr", 1);

        }

        @JsonAnyGetter

        public Map<String, Object> getOtherProperties() {

            return map;

        }

        public int getId() {

            return id;

        }

        public void setId(int id) {

            this.id = id;

        }

    }

}

package com.stono.sboot2_chp4_jackson.controller;

import com.fasterxml.jackson.core.JsonFactory;

import com.fasterxml.jackson.core.JsonGenerator;

import com.fasterxml.jackson.core.JsonParser;

import com.fasterxml.jackson.core.JsonToken;

import com.fasterxml.jackson.databind.ObjectMapper;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import java.io.IOException;

import java.io.StringWriter;

@Controller

@RequestMapping("/stream")

public class JacksonStreamController {

    @Qualifier("getObjectMapper")

    @Autowired

    ObjectMapper objectMapper;

    @RequestMapping("/parser.json")

    @ResponseBody

    public String parser() throws IOException {

        String json = "{\"name\":\"stono\",\"id\":1}";

        JsonFactory f = objectMapper.getFactory();

        String key = null, value = null;

        JsonParser parser = f.createParser(json);

        JsonToken token = parser.nextToken();

        System.out.println("token1:"+token);

        token = parser.nextToken();

        System.out.println("token2:"+token);

        if (token == JsonToken.FIELD_NAME) {

            key = parser.currentName();

        }

        token = parser.nextToken();

        System.out.println("token3:"+token);

        value = parser.getValueAsString();

        parser.close();

        return  key+","+value;

    }

    @RequestMapping("/generator.html")

    @ResponseBody

    public String generate() throws IOException {

        JsonFactory f = objectMapper.getFactory();

        StringWriter sw = new StringWriter();

        JsonGenerator g = f.createGenerator(sw);

        g.writeStartObject();

        g.writeStringField("name","stono");

//        g.writeString("string");

        g.writeEndObject();

        g.close();

        return sw.toString();

    }

}