最近我在将APDPlat升级到Java8，发现最新版本的struts2不支持Java8，同时由于之前有很多的同学希望我把APDPlat的struts2替换为spring mvc，所以我就决定试试看。本文我们看两个转换前后的例子：
1、下拉列表服务，此类比较简单，只涉及一个方法store：
使用struts2：
@Scope("prototype")
@Controller
@Namespace("/dictionary")
public class DicAction extends ExtJSSimpleAction<Dic> {
@Resource
private DicService dicService;
private String dic;
private String tree;
private boolean justCode;
/**
*
* 此类用来提供下拉列表服务,主要有两种下列类型：
* 1、普通下拉选项
* 2、树形下拉选项
* @return 不需要返回值，直接给客户端写数据
*
*/
public String store(){
Dic dictionary=dicService.getDic(dic);
if(dictionary==null){
LOG.info("没有找到数据词典 "+dic);
return null;
}
if("true".equals(tree)){
String json = dicService.toStoreJson(dictionary);
Struts2Utils.renderJson(json);
}else{
List<Map<String,String>> data=new ArrayList<>();
for(DicItem item : dictionary.getDicItems()){
Map<String,String> map=new HashMap<>();
if(justCode){
map.put("value", item.getCode());
}else{
map.put("value", item.getId().toString());
}
map.put("text", item.getName());
data.add(map);
}
Struts2Utils.renderJson(data);
}
return null;
}
public void setJustCode(boolean justCode) {
this.justCode = justCode;
}
public void setTree(String tree) {
this.tree = tree;
}
public void setDic(String dic) {
this.dic = dic;
}
}
使用spring mvc：
@Scope("prototype")
@Controller
@RequestMapping("/dictionary")
public class DicAction extends ExtJSSimpleAction<Dic> {
@Resource
private DicService dicService;
/**
*
* 此类用来提供下拉列表服务,主要有两种下拉类型：
* 1、普通下拉选项
* 2、树形下拉选项
* @param dic
* @param tree
* @param justCode
* @return 返回值直接给客户端
*/
@ResponseBody
@RequestMapping("/dic!store.action")
public String store(@RequestParam(required=false) String dic,
@RequestParam(required=false) String tree,
@RequestParam(required=false) String justCode){
Dic dictionary=dicService.getDic(dic);
if(dictionary==null){
LOG.info("没有找到数据词典 "+dic);
return "";
}
if("true".equals(tree)){
String json = dicService.toStoreJson(dictionary);
return json;
}else{
List<Map<String,String>> data=new ArrayList<>();
dictionary.getDicItems().forEach(item -> {
Map<String,String> itemMap=new HashMap<>();
if("true".equals(justCode)){
itemMap.put("value", item.getCode());
}else{
itemMap.put("value", item.getId().toString());
}
itemMap.put("text", item.getName());
data.add(itemMap);
});
String json = JSONArray.fromObject(data).toString();
return json;
}
}
}
2、数据字典服务，此类比较复杂，涉及的方法有create、delete、updatePart、retrieve、query、store：
使用struts2：
@Scope("prototype")
@Controller
@Namespace("/dictionary")
public class DicItemAction extends ExtJSSimpleAction<DicItem> {
@Resource
private DicService dicService;
private String node;
/**
* 返回数据字典目录树
* @return
*/
public String store() {
if (node == null) {
return null;
}
Dic dic=null;
if(node.trim().startsWith("root")){
dic = dicService.getRootDic();
}else{
int id=Integer.parseInt(node);
dic = dicService.getDic(id);
}
if (dic != null) {
String json = dicService.toJson(dic);
Struts2Utils.renderJson(json);
}
return null;
}
public void setNode(String node) {
this.node = node;
}
}
使用spring mvc：
@Scope("prototype")
@Controller
@RequestMapping("/dictionary")
public class DicItemAction extends ExtJSSimpleAction<DicItem> {
@Resource
private DicService dicService;
/**
* 返回数据字典目录树
* @param node
* @return
*/
@ResponseBody
@RequestMapping("/dic-item!store.action")
public String store(@RequestParam(required=false) String node) {
if (node == null) {
return "[]";
}
Dic dic=null;
if(node.trim().startsWith("root")){
dic = dicService.getRootDic();
}else{
int id=Integer.parseInt(node);
dic = dicService.getDic(id);
}
if (dic != null) {
String json = dicService.toJson(dic);
return json;
}
return "[]";
}
@ResponseBody
@RequestMapping("/dic-item!query.action")
public String query(@RequestParam(required=false) Integer start,
@RequestParam(required=false) Integer limit,
@RequestParam(required=false) String propertyCriteria,
@RequestParam(required=false) String orderCriteria,
@RequestParam(required=false) String queryString,
@RequestParam(required=false) String search){
super.setStart(start);
super.setLimit(limit);
super.setPropertyCriteria(propertyCriteria);
super.setOrderCriteria(orderCriteria);
super.setQueryString(queryString);
super.setSearch("true".equals(search));
return super.query();
}
@ResponseBody
@RequestMapping("/dic-item!retrieve.action")
public String retrieve(@ModelAttribute DicItem model) {
super.model = model;
return super.retrieve();
}
@ResponseBody
@RequestMapping("/dic-item!delete.action")
public String delete(@RequestParam String ids) {
super.setIds(ids);
return super.delete();
}
@ResponseBody
@RequestMapping("/dic-item!create.action")
public String create(@ModelAttribute DicItem model) {
super.model = model;
return super.create();
}
@ResponseBody
@RequestMapping("/dic-item!updatePart.action")
public String updatePart(@ModelAttribute DicItem model) {
super.model = model;
return super.updatePart();
}
}
原文：http://my.oschina.net/apdplat/blog/403561