我对上面链接的其中一个问题的答案做了一些修改。下面的代码给了我正确的content-length header值，我的响应json被完全服务。

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.Map;

import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;

@RestController
@RequestMapping("/rest")
public class EmployeeController {
    @GetMapping(value = /employees, produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Map<String, List<Object>>> getEmployeeDetails(@RequestParam(value = "organization_id", required = false) Integer orgId) throws IOException {
        Map<String, List<Object>> responseMap = //some method returns the data
        ObjectMapper objMapper = new ObjectMapper();
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        //getFactory() and createJsonGenerator() methods are deprecated
        JsonGenerator jsonGenerator = objMapper.getFactory().createGenerator(byteArrayOutputStream);
        objMapper.writeValue(jsonGenerator, responseMap);
        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.add(HttpHeaders.CONTENT_LENGTH,String.valueOf(byteArrayOutputStream.size()));
        return ResponseEntity.ok().headers(httpHeaders).body(responseMap);
    }
}

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