java map 相同的key_Java中如何合并有个具有相同key的Map

需求：查询两张表的数据，对数据进行合并。

/**

* 查询全部.

*

* @param entity

* @param requestData

* @return

*/

@RequestMapping(value = "findAll", method = RequestMethod.GET)

@ResponseBody

public Map findAll(SysWorkflow entity, SysWorkflowPass pass, PageRequestData requestData) {

Map map1 = workflowService.findAll(entity, requestData.getPageable());

requestData.setPage(null);

Map map2 = workflowPassService.findAll(pass, requestData.getPageable());

return combine(map1, map2);

}

private Map combine(Map map1, Map map2) {

Map map = new HashMap();

List list2 = (List) map2.get("data");

List list1 = (List) map1.get("data");

List list = new ArrayList();

for (SysWorkflowPass sysWorkflowPass : list2) {

SysWorkFlowPassDto dto = new SysWorkFlowPassDto();

dto.setId(sysWorkflowPass.getId());

dto.setCreateDate(sysWorkflowPass.getCreateDate());

dto.setModifyDate(sysWorkflowPass.getModifyDate());

dto.setSignedUsers(sysWorkflowPass.getSignedUsers());

dto.setVersion(sysWorkflowPass.getVersion());

dto.setWorkflowType(sysWorkflowPass.getWorkflowPass());

dto.setName(sysWorkflowPass.getName());

list.add(dto);

}

for (SysWorkflow sysWorkflow : list1) {

SysWorkFlowPassDto dto = new SysWorkFlowPassDto();

dto.setId(sysWorkflow.getId());

dto.setCreateDate(sysWorkflow.getCreateDate());

dto.setModifyDate(sysWorkflow.getModifyDate());

dto.setSignedUsers(sysWorkflow.getSignedUsers());

dto.setVersion(sysWorkflow.getVersion());

dto.setWorkflowType(sysWorkflow.getWorkflowType().getName());

dto.setName(sysWorkflow.getName());

list.add(dto);

}

map.put("data", list);

Long total1 = (Long) map1.get("total");

Long total2 = (Long) map2.get("total");

map.put("total", total1 + total2);

map.put("success", "Boolean");

return map;

}

需求：查询两张表的数据，对数据进行合并。 /** * 查询全部. * * @param entity * @param requestData * @return */ @RequestMapping(value = "findAll", method = RequestMethod.GET) @ResponseBody public Map findAll(SysWorkflow entity, SysWorkflowPass pass, PageRequestData requestData) { Map map1 = workflowService.findAll(entity, requestData.getPageable()); requestData.setPage(null); Map map2 = workflowPassService.findAll(pass, requestData.getPageable()); return combine(map1, map2); } private Map combine(Map map1, Map map2) { Map map = new HashMap(); List list2 = (List) map2.get("data"); List list1 = (List) map1.get("data"); List list = new ArrayList(); for (SysWorkflowPass sysWorkflowPass : list2) { SysWorkFlowPassDto dto = new SysWorkFlowPassDto(); dto.setId(sysWorkflowPass.getId()); dto.setCreateDate(sysWorkflowPass.getCreateDate()); dto.setModifyDate(sysWorkflowPass.getModifyDate()); dto.setSignedUsers(sysWorkflowPass.getSignedUsers()); dto.setVersion(sysWorkflowPass.getVersion()); dto.setWorkflowType(sysWorkflowPass.getWorkflowPass()); dto.setName(sysWorkflowPass.getName()); list.add(dto); } for (SysWorkflow sysWorkflow : list1) { SysWorkFlowPassDto dto = new SysWorkFlowPassDto(); dto.setId(sysWorkflow.getId()); dto.setCreateDate(sysWorkflow.getCreateDate()); dto.setModifyDate(sysWorkflow.getModifyDate()); dto.setSignedUsers(sysWorkflow.getSignedUsers()); dto.setVersion(sysWorkflow.getVersion()); dto.setWorkflowType(sysWorkflow.getWorkflowType().getName()); dto.setName(sysWorkflow.getName()); list.add(dto); } map.put("data", list); Long total1 = (Long) map1.get("total"); Long total2 = (Long) map2.get("total"); map.put("total", total1 + total2); map.put("success", "Boolean"); return map; }