Java 代码异常处理：项目名称重复校验及其他异常提示

{ "title": "if(pic==null||pic.getSize()==0)throw new RuntimeException("请上传项目建设前图片");\n if(item.getLibid()==null)throw new RuntimeException("批次id不能为空");\n TNatural nat = naturalMapper.selectTNaturalById(item.getNatid());\n if(nat.getKeyvillage()==true)throw new RuntimeException("该村是省定贫困村，不能选择！");\n\n TProjectbatchlib lib = tProjectbatchlibMapper.selectTProjectbatchlibById(item.getLibid());\n if(lib.getStatus()==1||lib.getStatus()==3)throw new RuntimeException("页面错误,请刷新浏览器！");\n\n // String hql_count = " select count(x) from ProjectEntity x where x.nat.id = ? and x.projectName = ? and x.deleted = 0 ";\n String hql_count = " select count() from t_project where R_NAT_ID = "+nat.getId()+" and C_PROJECTNAME = '"+item.getProjectName()+"' and C_DELETED = 0 ";\n\n List<Object[]> objects = newSQLService.exeSelect1(hql_count);\n if( Integer.valueOf(objects.get(0)[0].toString())>0)throw new RuntimeException("项目名称不能重复！");", "description": "本文介绍一段 Java 代码，该代码用于校验项目名称是否重复，以及其他异常处理，例如图片为空、批次 ID 为空、省定贫困村等情况。", "keywords": "Java, 异常处理, 项目名称校验, 运行时异常, 图片为空, 批次 ID, 省定贫困村, SQL 查询, HQL", "content": "// 如果图片为空或者图片大小为0，则抛出运行时异常，提示"请上传项目建设前图片"。\n if(pic==null||pic.getSize()==0)throw new RuntimeException("请上传项目建设前图片");\n // 如果批次id为空，则抛出运行时异常，提示"批次id不能为空"。\n if(item.getLibid()==null)throw new RuntimeException("批次id不能为空");\n // 根据item中的natid查询TNatural对象，如果该村是省定贫困村，则抛出运行时异常，提示"该村是省定贫困村，不能选择！"。\n TNatural nat = naturalMapper.selectTNaturalById(item.getNatid());\n if(nat.getKeyvillage()==true)throw new RuntimeException("该村是省定贫困村，不能选择！");\n\n // 根据item中的libid查询TProjectbatchlib对象，如果该对象的状态为1或者3，则抛出运行时异常，提示"页面错误,请刷新浏览器！"。\n TProjectbatchlib lib = tProjectbatchlibMapper.selectTProjectbatchlibById(item.getLibid());\n if(lib.getStatus()==1||lib.getStatus()==3)throw new RuntimeException("页面错误,请刷新浏览器！");\n\n // String hql_count = " select count(x) from ProjectEntity x where x.nat.id = ? and x.projectName = ? and x.deleted = 0 ";\n // 构建hql_count查询语句，查询t_project表中满足条件的记录数量，条件为R_NAT_ID等于nat的id，C_PROJECTNAME等于item中的项目名称，C_DELETED等于0。\n String hql_count = " select count() from t_project where R_NAT_ID = "+nat.getId()+" and C_PROJECTNAME = '"+item.getProjectName()+"' and C_DELETED = 0 ";\n\n // 执行hql_count查询语句，将结果存储在objects列表中。\n List<Object[]> objects = newSQLService.exeSelect1(hql_count);\n // 如果objects列表中第一个元素的值大于0，则抛出运行时异常，提示"项目名称不能重复！"。\n if( Integer.valueOf(objects.get(0)[0].toString())>0)throw new RuntimeException("项目名称不能重复！");