hashmap 传到js

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

@RestController
public class HashMapController {

    @GetMapping("/data")
    public String getData() throws JsonProcessingException {
        Map<String, Object> hashMap = new HashMap<>();
        hashMap.put("name", "Alice");
        hashMap.put("age", 30);

        ObjectMapper objectMapper = new ObjectMapper();
        return objectMapper.writeValueAsString(hashMap);
    }
}

fetch('/data')
    .then(response => response.json())
    .then(data => {
        console.log(data); // 输出: { name: 'Alice', age: 30 }
        // 现在你可以在 JavaScript 中使用这个对象了
    })
    .catch(error => console.error('Error:', error));

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

import java.io.IOException;

public class CustomObjectSerializer extends StdSerializer<CustomObject> {

    public CustomObjectSerializer() {
        this(null);
    }

    public CustomObjectSerializer(Class<CustomObject> t) {
        super(t);
    }

    @Override
    public void serialize(CustomObject value, JsonGenerator gen, SerializerProvider provider) throws IOException {
        gen.writeStartObject();
        gen.writeStringField("customField", value.getCustomField());
        // 添加其他字段的序列化逻辑
        gen.writeEndObject();
    }
}

objectMapper.registerModule(new SimpleModule().addSerializer(CustomObject.class, new CustomObjectSerializer()));