java 异常处理机制

1.java异常处理机制：

public ActionForward listEC(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) {

  try{

      this.initLocation(request);

      LoginUser loginUser = (LoginUser) WebUtils.getRequiredSessionAttribute(request, "loginUser");

      Limit limit = ExtremeTablePage.getLimit(request);

      Map<string object> filterMap = ExtremeTablePage.getFilter(limit);

      filterMap.put("acinId",      request.getParameter("acinId"));

      filterMap.put("operUserId", loginUser.getId());

      this.beForePropertiesSetForList(loginUser, filterMap);

      Page page = entityManager.findBy(filterMap, ExtremeTablePage.getSort(limit), limit.getPage(), limit .getCurrentRowsDisplayed());

     request.setAttribute("totalRows", page.getTotalCount());         request.setAttribute(this.getEntityListName(), page.getResult());

  }catch(Exception e){

    e.printStackTrace();

  }

    return mapping.findForward(this.LIST);

}
1.此处findBy()业务方法抛出异常，由try{}catch{}捕获。

org.springframework.dao.DataIntegrityViolationException: SqlMapClient operation; SQL []; --- The error occurred while applying a parameter map. --- Check the com.sniper.ghgAndpay.model.BargainPay.selectCount-InlineParameterMap. --- Check the statement (query failed). --- Cause: java.sql.SQLSyntaxErrorException: ORA-01722: 无效数字 ; nested exception is com.ibatis.common.jdbc.exception.NestedSQLException: --- The error occurred while applying a parameter map. --- Check the com.sniper.ghgAndpay.model.BargainPay.selectCount-InlineParameterMap. --- Check the statement (query failed). --- Cause: java.sql.SQLSyntaxErrorException: ORA-01722: 无效数字
Caused by: com.ibatis.common.jdbc.exception.NestedSQLException: --- The error occurred while applying a parameter map. --- Check the com.sniper.ghgAndpay.model.BargainPay.selectCount-InlineParameterMap. --- Check the statement (query failed). --- Cause: java.sql.SQLSyntaxErrorException: ORA-01722: 无效数字</string>

 

修改：

public ActionForward listEC(ActionMapping mapping, ActionForm form, HttpServletRequest request,

HttpServletResponse response) {

try {

this.initLocation(request);

LoginUser loginUser = (LoginUser) WebUtils.getRequiredSessionAttribute(request, "loginUser");

Limit limit = ExtremeTablePage.getLimit(request);

Map<String, Object> filterMap = ExtremeTablePage.getFilter(limit);

filterMap.put("acinId", request.getParameter("acinId"));

filterMap.put("operUserId", loginUser.getId());

this.beForePropertiesSetForList(loginUser, filterMap);

Page page = entityManager.findBy(filterMap, ExtremeTablePage.getSort(limit), limit.getPage(), limit

.getCurrentRowsDisplayed());

request.setAttribute("totalRows", page.getTotalCount());

request.setAttribute(this.getEntityListName(), page.getResult());

} catch (Exception e) {

log.error(e);//项控制台输出日志信息

this.saveError(request, "ecListInputError");//提供错误信息给用户操作界面

request.setAttribute("totalRows", 0);

request.setAttribute(this.getEntityListName(), new ArrayList());

}

return mapping.findForward(this.LIST);

}