From c52a2d0f0820e65026a359b19e0a5723e48e8f3f Mon Sep 17 00:00:00 2001
From: Eterlaze <1215710470@qq.com>
Date: Sun, 22 Dec 2024 11:07:31 +0800
Subject: [PATCH] =?UTF-8?q?HTTTP=E5=93=8D=E5=BA=94=E4=B8=AD=E8=8E=B7?=
 =?UTF-8?q?=E5=8F=96JSON=E6=95=B0=E6=8D=AE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../com/example/api/utils/ResponseUtil.java   | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 IDEA/src/main/java/com/example/api/utils/ResponseUtil.java

diff --git a/IDEA/src/main/java/com/example/api/utils/ResponseUtil.java b/IDEA/src/main/java/com/example/api/utils/ResponseUtil.java
new file mode 100644
index 00000000..431caa60
--- /dev/null
+++ b/IDEA/src/main/java/com/example/api/utils/ResponseUtil.java
@@ -0,0 +1,44 @@
+package com.example.api.utils;
+
+import com.alibaba.fastjson.JSON;
+
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+/**
+ * ResponseUtil 类提供向 HTTP 响应中写入 JSON 数据的工具方法。
+ */
+public final class ResponseUtil {
+
+    /**
+     * 向 HttpServletResponse 中写入 JSON 数据。
+     * @param response HttpServletResponse 对象，用于设置响应头和写入响应体。
+     * @param o 要写入响应体的对象，将被转换为 JSON 字符串。
+     */
+    public static void writeJson(HttpServletResponse response, Object o) {
+        // 设置跨域资源共享（CORS）相关的响应头，允许跨域请求
+        response.setHeader("Access-Control-Allow-Origin", "*");
+        response.setHeader("Access-Control-Allow-Credentials", "true");
+        response.setHeader("Access-Control-Allow-Methods", "POST, GET, PATCH, DELETE, PUT");
+        response.setHeader("Access-Control-Max-Age", "3600");
+        response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
+        // 设置响应内容类型为 JSON 格式，并指定字符集为 utf-8
+        response.setContentType("application/json;charset=utf-8");
+        // 设置 HTTP 响应状态码为 200（OK）
+        response.setStatus(200);
+        try {
+            // 获取 PrintWriter 对象，用于向客户端写入数据
+            PrintWriter writer = response.getWriter();
+            // 将对象转换为 JSON 字符串
+            writer.write(JSON.toJSONString(o));
+            // 清空缓冲区，确保所有数据都写入输出流
+            writer.flush();
+            // 关闭 PrintWriter 对象
+            writer.close();
+        } catch (IOException e) {
+            // 如果发生 IO 异常，打印堆栈跟踪信息
+            e.printStackTrace();
+        }
+    }
+}