feat: 添加 Web 工具类和写入响应 JSON 方法

Author: cadecode

simple-common/src/main/java/top/cadecode/common/enums/FrameErrorEnum.java

@@ -14,7 +14,8 @@ public enum FrameErrorEnum implements ResponseCode {
     JSON_TO_STR_ERROR(1000, "对象转 json 字符串出错"),
     JSON_TO_OBJ_ERROR(1001, "json 字符串转对象出错"),
     JWT_CREATE_ERROR(1003, "创建 token 出错"),
-    JWT_VERIFY_ERROR(1003, "解析 token 出错"),
+    JWT_VERIFY_ERROR(1004, "解析 token 出错"),
+    RES_WRITE_JSON_ERROR(1005, "向响应对象写入 JSON 出错 "),
     ;
 
     private final String code;

simple-common/src/main/java/top/cadecode/common/util/WebUtil.java

@@ -0,0 +1,36 @@
+package top.cadecode.common.util;
+
+import org.springframework.http.MediaType;
+import top.cadecode.common.core.exception.CommonException;
+import top.cadecode.common.enums.FrameErrorEnum;
+
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+/**
+ * @author Cade Li
+ * @date 2021/12/11
+ * @description Web 工具类
+ */
+public class WebUtil {
+
+    /**
+     * 向响应对象写入 JSON
+     *
+     * @param response 响应对象
+     * @param jsonString JSON 字符串
+     */
+    public static void writeJsonToResponse(HttpServletResponse response, String jsonString) {
+        try {
+            response.setContentType(MediaType.APPLICATION_JSON_VALUE);
+            response.setCharacterEncoding("UTF-8");
+            PrintWriter writer = response.getWriter();
+            writer.print(jsonString);
+            writer.flush();
+        } catch (IOException e) {
+            throw CommonException.of(FrameErrorEnum.RES_WRITE_JSON_ERROR)
+                    .suppressed(e);
+        }
+    }
+}