java try catch 问题

Controller层中使用try catch功能

 1   public Wrapper billQuery(@RequestBody OrderBillQueryReq orderBillQueryReq){
 2         log.info("账单列表查询入参:{}", JSON.toJSONString(orderBillQueryReq));
 3         try {
 4             PageList<OcOrderBillInfoDto> billList =  orderBillService.list(orderBillQueryReq);
 5             return WrapMapper.ok(new PageVO<>(billList));
 6         } catch (Exception e) {
 7             log.error("查询账单列表失败，错误信息：{}", e.getMessage(),e);
 8             return WrapMapper.error(e.getMessage());
 9         }
10     }
11 }    

ServiceImpl层中是否使用try catch功能对Controller层的影响

1，使用try catch功能，抓Exception

 1 public PageList<OcOrderBillInfoDto> list(OrderBillQueryReq orderBillQueryReq) {   
 2     try {
 3         List<Integer> listIN = new ArrayList<>();
 4         listIN.get(2);
 5     } catch (Exception e) {
 6         log.error("错误信息：{}", e.getMessage(),e);
 7     }
 8 
 9     //业务逻辑
10     return new PageList<>(listModel,pageList.getPaginator());
11 }

结果：service层会打印错误日志，Controller层不打印错误信息和日志。但是下面的业务代码会继续执行，向前端输出正常结果。

1 [service-xx-bill] 2020-04-08 10:27:27.932 [http-nio-9100-exec-1] ERROR c.w.s.c.bill.service.impl.OrderBillServiceImpl - 错误信息：Index: 2, Size: 0
2 java.lang.IndexOutOfBoundsException: Index: 2, Size: 0
3     at java.util.ArrayList.rangeCheck(ArrayList.java:657)
4     at java.util.ArrayList.get(ArrayList.java:433)
5     at xxxxxxxl.OrderBillServiceImpl.list(OrderBillServiceImpl.java:56)
6     at xxxxxxx.controller.OrderBillController.billQuery(OrderBillController.java:59)
7     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

2，不使用try catch功能。

1 public PageList<OcOrderBillInfoDto> list(OrderBillQueryReq orderBillQueryReq) {   
2     List<Integer> listIN = new ArrayList<>();
3     listIN.get(2);
4     
5     //业务逻辑
6     return new PageList<>(listModel,pageList.getPaginator());
7 }

结果：service层不打印错误日志，Controller层打印错误信息和日志。下面的业务代码不会继续执行，向前端输出错误信息。

1 [xxxx-bill] 2020-04-08 10:38:37.259 [http-nio-9100-exec-2] ERROR c.w.s.c.bill.controller.OrderBillController - 查询账单列表失败，错误信息：Index: 2, Size: 0
2 java.lang.IndexOutOfBoundsException: Index: 2, Size: 0
3     at java.util.ArrayList.rangeCheck(ArrayList.java:657)
4     at java.util.ArrayList.get(ArrayList.java:433)
5     at xxxx.bill.service.impl.OrderBillServiceImpl.list(OrderBillServiceImpl.java:55)
6     at xxxx.bill.controller.OrderBillController.billQuery(OrderBillController.java:59)
7     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)