对于springMVC处理方法支持支持一系列的返回方式:
- ModelAndView
- Model
- ModelMap
- Map
- View
- String
- Void
具体可参考链接:
http://my.oschina.net/bosscheng/blog/126941
以上是SpringMvc原生支持的返回类型,如果返回Json,可以用Json String或者Map,
还可以返回类,操作步骤见下面介绍。
需要注意的是,SpringMvc与Jackson结合使用时,如果返回的是一个Object、或者返回的Map中是Object型的,就需要对Object中的成员变量加注解,否则会报错:org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation,500 code error。
原因是 Jackson 默认情况下不知道怎么去序列化,方法有:
1.为成员变量增加getter、setter方法
2. 或者也可以给field加上 @JsonProperty 注解,(也可在getter上加) , 还能用它指定序列化时的属性名
@JsonProperty可以标注在field或者getter上,
Defines name of the logical property, i.e. Json object field name to use for the property(i.e. @JsonProperty("GID") ): if empty String (which is the default), will use name of the field that is annotated.
代码示例:
class ItemContent {
private int gid;
private int sid;
private Date createTime;
private String gname;
private String name;
private String nologinUrl;
@JsonProperty
int getGid() {
return gid;
}
void setGid(int gid) {
this.gid = gid;
}
@JsonProperty
int getSid() {
return sid;
}
.............................
@RequestMapping(value = "/dissert/getServerList.do")
@ResponseBody
public Object getServerList(HttpServletRequest request) {
Map<String, Object> resultMap = new HashMap<String, Object>();
..................................
List<ItemContent> tempList = new ArrayList<ItemContent>();
for (GameServer gameServer : listServers) {
......................
ItemContent item = new ItemContent();
item.setGid(gameServer.getGid());
item.setGname(gameServer.getGname());
item.setSid(gameServer.getSid());
item.setName(gameServer.getName());
item.setCreateTime(gameServer.getCreateTime());
}
tempList.add(item);
}
}
resultMap.put("open", tempList);
return resultMap;
}
关于Jackson介绍,可参考:
http://unmi.cc/jackson-java-object-json-string/