ResultUtil 工具类

import com.fasterxml.jackson.databind.ObjectMapper;  
import jakarta.servlet.http.HttpServletResponse;  
import org.springframework.http.HttpStatus;  
  
import java.io.IOException;  
import java.io.PrintWriter;  
  
public class ResultUtil {  
  
    /**  
     * 成功响参  
     * @param response  
     * @param result  
     * @throws IOException  
     */  
    public static void ok(HttpServletResponse response, Response<?> result) throws IOException {  
        response.setCharacterEncoding("UTF-8");  
        response.setStatus(HttpStatus.OK.value());  
        response.setContentType("application/json");  
        PrintWriter writer = response.getWriter();  
  
        ObjectMapper mapper = new ObjectMapper();  
        writer.write(mapper.writeValueAsString(result));  
        writer.flush();  
        writer.close();  
    }  
    /**  
     * 失败响参  
     * @param response  
     * @param result  
     * @throws IOException  
     */  
    public static void fail(HttpServletResponse response, Response<?> result) throws IOException {  
        response.setCharacterEncoding("UTF-8");  
        response.setStatus(HttpStatus.OK.value());  
        response.setContentType("application/json");  
        PrintWriter writer = response.getWriter();  
  
        ObjectMapper mapper = new ObjectMapper();  
        writer.write(mapper.writeValueAsString(result));  
        writer.flush();  
        writer.close();  
    }  
    /**  
     * 失败响参  
     * @param response  
     * @param status 可指定响应码，如 401 等  
     * @param result  
     * @throws IOException  
     */  
    public static void fail(HttpServletResponse response, int status, Response<?> result) throws IOException {  
        response.setCharacterEncoding("UTF-8");  
        response.setStatus(status);  
        response.setContentType("application/json");  
        PrintWriter writer = response.getWriter();  
  
        ObjectMapper mapper = new ObjectMapper();  
        writer.write(mapper.writeValueAsString(result));  
        writer.flush();  
        writer.close();  
    }}