更新

src/com/hellogithub/servlet/DeleteSession.java

@@ -13,6 +13,16 @@ import java.net.http.HttpClient;
 public class DeleteSession extends HttpServlet{
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setCharacterEncoding("UTF-8");
+        resp.setContentType("text/html; charset=utf-8");
+        //        设置响应头允许ajax跨域访问
+        String curOrigin = req.getHeader("Origin");
+        resp.setHeader("Access-Control-Allow-Origin", curOrigin == null ? "true" : curOrigin);
+        resp.setHeader("Access-Control-Allow-Credentials", "true");
+        resp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
+        resp.setHeader("Access-Control-Max-Age", "3600");
+        resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
+        resp.setContentType("application/json;charset=UTF-8");
         HttpSession session = req.getSession();
         session.invalidate();
     }

src/com/hellogithub/servlet/retUserServlet.java

@@ -48,7 +48,8 @@ public class retUserServlet extends HttpServlet {
         {
             setResultError("查询失败",writer);
         }else{
-            setResultOK("查询成功",writer);
+            writer.println(jsonString);
+            writer.close();
         }
 
 

src/com/hellogithub/servlet/userDetailServlet.java

@@ -60,7 +60,6 @@ public class userDetailServlet extends HttpServlet {
             dataMap.put("project",projectService.retProjectByUserId(id));
             jsonString = JSONObject.toJSONString(dataMap);
             writer.println(jsonString);
-            setResultOK("查询失败",writer);
         }
     }