Spring Boot—08Jackson处理JSON

Posted 2020-11-01 ParamousGIS

package com.sample.smartmap.controller;

import java.io.IOException;
import java.math.BigDecimal;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.bee.sample.ch3.entity.User;
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;

@Controller
@RequestMapping("/jackson")
public class JacksonSampleController {
    
    Log log = LogFactory.getLog(JacksonSampleController.class);
    //参考JacksonConf
    @Autowired ObjectMapper mapper;
    
    @GetMapping("/now.json")
    public @ResponseBody Map now(){
        Map map = new HashMap();
        map.put("date", new Date());
        return map;
    }
    
    @GetMapping("/readtree.json")
    public @ResponseBody String readtree() throws JsonProcessingException, IOException{
        String json = "{\"name\":\"lijz\",\"id\":10}";
        JsonNode node = mapper.readTree(json);
        
        String name = node.get("name").asText();
        int id = node.get("id").asInt();
        return "name:"+name+",id:"+id;
        
    }
    
    
    @GetMapping("/databind.json")
    public @ResponseBody String databind() throws JsonProcessingException, IOException{
        String json = "{\"name\":\"lijz\",\"id\":10}";
        User user = mapper.readValue(json, User.class);
        return "name:"+user.getName()+",id:"+user.getId();
        
    }
    
    
    @GetMapping("/serialization.json")
    public @ResponseBody String custom() throws JsonProcessingException {

        User user = new User();
        user.setId(1l);
        user.setName("hello");
        String str = mapper.writeValueAsString(user);
        
        return str;
        
    }
    

    
@JsonIgnoreProperties ({"id","photo"})
    public static class SamplePojo{
        Long id;
        String name;
        byte[] photo;
        @JsonIgnore
        BigDecimal salary;
        Map<String , Object> otherProperties = new HashMap<String , Object>();
        public Long getId() {
            return id;
        }
        public void setId(Long id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public byte[] getPhoto() {
            return photo;
        }
        public void setPhoto(byte[] photo) {
            this.photo = photo;
        }
        public BigDecimal getSalary() {
            return salary;
        }
        public void setSalary(BigDecimal salary) {
            this.salary = salary;
        }
        @JsonAnyGetter
        public Map<String, Object> getOtherProperties() {
            return otherProperties;
        }
         @JsonAnySetter
        public void setOtherProperties(Map<String, Object> otherProperties) {
            this.otherProperties = otherProperties;
        }
         
    }


public static class Usererializer extends JsonSerializer<User> {  
    @Override  
    public void serialize(User value, JsonGenerator jgen, SerializerProvider provider)   
      throws IOException, JsonProcessingException {  
        jgen.writeStartObject();  
        jgen.writeStringField("user-name", value.getName());  
        jgen.writeEndObject();  
    }  
}  
    
public class UserDeserializer extends JsonDeserializer<User> {  
       
    @Override  
    public User deserialize(JsonParser jp, DeserializationContext ctxt)   
      throws IOException, JsonProcessingException {  
        JsonNode node = jp.getCodec().readTree(jp);  
        String name = node.get("user-name").asText(); 
        User user = new User();
        user.setName(name);
        return user;
    }  
}  
    
    
}