java入参为对象的（非基本数据类型int/float等）修改属性会影响原始对象

	@ApiOperation("登录接口")@RequestMapping(value = "/login", method = RequestMethod.POST)public Result<JSONObject> login(@RequestBody SysLoginModel sysLoginModel){Result<JSONObject> result = new Result<JSONObject>();// by wangh 测试System.out.println("1.result = " + result);String username = sysLoginModel.getUsername();String password = sysLoginModel.getPassword();//update-begin-author:taoyan date:2022-11-7 for: issues/4109 平台用户登录失败锁定用户if(isLoginFailOvertimes(username)){return result.error500("该用户登录失败次数过多，请于10分钟后再次登录！");}//update-end-author:taoyan date:2022-11-7 for: issues/4109 平台用户登录失败锁定用户//update-begin--Author:scott  Date:20190805 for：暂时注释掉密码加密逻辑，有点问题//前端密码加密，后端进行密码解密//password = AesEncryptUtil.desEncrypt(sysLoginModel.getPassword().replaceAll("%2B", "\\+")).trim();//密码解密//update-begin--Author:scott  Date:20190805 for：暂时注释掉密码加密逻辑，有点问题//update-begin-author:taoyan date:20190828 for:校验验证码String captcha = sysLoginModel.getCaptcha();if(captcha==null){result.error500("验证码无效");// by wangh 测试System.out.println("3.result = " + result);return result;}String lowerCaseCaptcha = captcha.toLowerCase();//update-begin-author:taoyan date:2022-9-13 for: VUEN-2245 【漏洞】发现新漏洞待处理20220906// 加入密钥作为混淆，避免简单的拼接，被外部利用，用户自定义该密钥即可String origin = lowerCaseCaptcha+sysLoginModel.getCheckKey()+jeecgBaseConfig.getSignatureSecret();String realKey = Md5Util.md5Encode(origin, "utf-8");//update-end-author:taoyan date:2022-9-13 for: VUEN-2245 【漏洞】发现新漏洞待处理20220906Object checkCode = redisUtil.get(realKey);//当进入登录页时，有一定几率出现验证码错误 #1714if(checkCode==null || !checkCode.toString().equals(lowerCaseCaptcha)) {log.warn("验证码错误，key= {} , Ui checkCode= {}, Redis checkCode = {}", sysLoginModel.getCheckKey(), lowerCaseCaptcha, checkCode);result.error500("验证码错误");// 改成特殊的code 便于前端判断result.setCode(HttpStatus.PRECONDITION_FAILED.value());// by wangh 测试System.out.println("4.result = " + result);return result;}//update-end-author:taoyan date:20190828 for:校验验证码//1. 校验用户是否有效//update-begin-author:wangshuai date:20200601 for: 登录代码验证用户是否注销bug，if条件永远为falseLambdaQueryWrapper<SysUser> queryWrapper = new LambdaQueryWrapper<>();queryWrapper.eq(SysUser::getUsername,username);SysUser sysUser = sysUserService.getOne(queryWrapper);//update-end-author:wangshuai date:20200601 for: 登录代码验证用户是否注销bug，if条件永远为falseresult = sysUserService.checkUserIsEffective(sysUser);if(!result.isSuccess()) {// by wangh 测试System.out.println("5.result = " + result);return result;}//2. 校验用户名或密码是否正确String userpassword = PasswordUtil.encrypt(username, password, sysUser.getSalt());String syspassword = sysUser.getPassword(); // sysUser取自数据库，密码是md5加密的if (!syspassword.equals(userpassword)) {//update-begin-author:taoyan date:2022-11-7 for: issues/4109 平台用户登录失败锁定用户addLoginFailOvertimes(username);//update-end-author:taoyan date:2022-11-7 for: issues/4109 平台用户登录失败锁定用户result.error500("用户名或密码错误");// by wangh 测试System.out.println("6.result = " + result);return result;}// by wangh 测试System.out.println("7.调用userinfo前 result = " + result);//用户登录信息userInfo(sysUser, result);// by wangh 测试System.out.println("8.调用userinfo后result = " + result);//update-begin--Author:liusq  Date:20210126  for：登录成功，删除redis中的验证码redisUtil.del(realKey);//update-begin--Author:liusq  Date:20210126  for：登录成功，删除redis中的验证码redisUtil.del(CommonConstant.LOGIN_FAIL + username);LoginUser loginUser = new LoginUser();BeanUtils.copyProperties(sysUser, loginUser);baseCommonService.addLog("用户名: " + username + ",登录成功！", CommonConstant.LOG_TYPE_1, null,loginUser);//update-end--Author:wangshuai  Date:20200714  for：登录日志没有记录人员// by wangh 测试System.out.println("9.result = " + result);return result;}

方法中的userInfo(sysUser, result);函数没有返回值，但是却修改了result的属性，使得最终返回的result中添加了用户信息

为了验证result是否被userInfo（）修改，分别在userInfo（）前后加入打印：

// by wangh 测试
System.out.println("7.调用userinfo前 result = " + result);//用户登录信息
userInfo(sysUser, result);// by wangh 测试
System.out.println("8.调用userinfo后result = " + result);

输出结果：

7.调用userinfo前 result = Result(success=true, message=, code=0, result=null, timestamp=1697524486057, onlTable=null)8.调用userinfo后 result = Result(success=true, message=登录成功, code=200, 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"已完成","title":"已完成","value":"3"},{"label":"已作废","text":"已作废","title":"已作废","value":"4"}],"work_overtime":[],"depart_status":[{"label":"不启用","text":"不启用","title":"不启用","value":"0"},{"label":"启用","text":"启用","title":"启用","value":"1"}],"task_type":[]}}, timestamp=1697524486057, onlTable=null)

这也解决了我之前看代码时的疑惑，为什么下面的代码会放在userInfo(sysUser, result)内，他们能影响最终的返回值吗？

obj.put("token", token);
obj.put("userInfo", sysUser);
result.setResult(obj);

	private Result<JSONObject> userInfo(SysUser sysUser, Result<JSONObject> result) {String username = sysUser.getUsername();String syspassword = sysUser.getPassword();// 获取用户部门信息JSONObject obj = new JSONObject(new LinkedHashMap<>());//1.生成tokenString token = JwtUtil.sign(username, syspassword);// 设置token缓存有效时间redisUtil.set(CommonConstant.PREFIX_USER_TOKEN + token, token);redisUtil.expire(CommonConstant.PREFIX_USER_TOKEN + token, JwtUtil.EXPIRE_TIME * 2 / 1000);obj.put("token", token);//2.设置登录租户Result<JSONObject> loginTenantError = sysUserService.setLoginTenant(sysUser, obj, username,result);if (loginTenantError != null) {return loginTenantError;}//3.设置登录用户信息obj.put("userInfo", sysUser);//4.设置登录部门 分別處理單用戶0部門單部門和多部門情況List<SysDepart> departs = sysDepartService.queryUserDeparts(sysUser.getId());obj.put("departs", departs);if (departs == null || departs.size() == 0) {obj.put("multi_depart", 0);} else if (departs.size() == 1) {sysUserService.updateUserDepart(username, departs.get(0).getOrgCode(),null);obj.put("multi_depart", 1);} else {//查询当前是否有登录部门// update-begin--Author:wangshuai Date:20200805 for：如果用戶为选择部门，数据库为存在上一次登录部门，则取一条存进去SysUser sysUserById = sysUserService.getById(sysUser.getId());if(oConvertUtils.isEmpty(sysUserById.getOrgCode())){sysUserService.updateUserDepart(username, departs.get(0).getOrgCode(),null);}// update-end--Author:wangshuai Date:20200805 for：如果用戶为选择部门，数据库为存在上一次登录部门，则取一条存进去obj.put("multi_depart", 2);}obj.put("sysAllDictItems", sysDictService.queryAllDictItems());result.setResult(obj);result.success("登录成功");return result;}

 得出结论，即使不使用返回值，也可以通过修改传入参数对象的属性来影响主程序中的对象属性。

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