Springmvc如何实现返回xml及json格式

@RequestMapping(value = "/rss", produces = "application/xml;charset=utf-8")
@ResponseBody
public String loadRss() throws Exception {
　　//return 将xml转换成对应的String
}

public class Resultimplements Serializable {
　　private static final long serialVersionUID = -349012453592429794L;
　　private int status
　　//get set
}

@RequestMapping(value = "/checkSudoku")
@ResponseBody
public Result checkMobilegamesSudoku(String sudokuList) {
　　result.setStatus(1);
　　return result;
}