@GetMapping("/hello")public String hello1(){//这里使用的thymeleaf，会去找hello.htmlreturn "hello";}@ResponseBody@GetMapping("/hello")public String hello2(){//直接返回字符串return "hello lhb";}

{"code":0"msg" :"data":{},[]
}

{"code":777"msg" :"服务器异常""data":{}
}

public class Result<T> {private int code;private String msg;private T data;/*** 请求成功时调用* @param data* @return*/public static <T> Result<T> success(T data){return new Result<T>(data);}public static <T> Result<T> error(CodeMsg cm){return new Result<T>(cm);}/*** 只传入数据默认成功，所以添加默认的code和msg* @param data*/private Result(T data) {this.code=0;this.msg="success";this.data=data;}private Result(CodeMsg cm) {if(cm==null){return;}this.code=cm.getCode();this.msg=cm.getMsg();}public int getCode() {return code;}public String getMsg() {return msg;}public T getData() {return data;}}

public class CodeMsg {private int code;private String msg;//通用的错误码public static CodeMsg SUCCESS = new CodeMsg(0, "success");public static CodeMsg SERVER_ERROR = new CodeMsg(777, "服务端异常");public int getCode() {return code;}public String getMsg() {return msg;}private CodeMsg(int code,String msg) {this.code = code;this.msg = msg;}}

@ResponseBody@GetMapping("/hello")public Result<String> hello(){return Result.success("hello");}

@ResponseBody@GetMapping("/helloerror")public Result<String> helloError(){return Result.error(new CodeMsg(777,"服务器异常"));}    

@ResponseBody@GetMapping("/helloerror")public Result<String> helloError(){return Result.error(CodeMsg.SERVER_ERROR);}