1.返回消息及状态码
/**
* <p>Title: ReturnMsg.java</p>
* <p>Description: 返回結果的状态碼和信息</p>
* @author shy
* @Version 1.0
* @Date 2018年7月3日上午10:35:05
*/
public enum ReturnMsg {
SUCCESS("0", "成功"),
EXCEPTION1("10001", "1*******异常"),
EXCEPTION2("10002", "2*******异常"),
EXCEPTION3("10003", "3*******异常"),
EXCEPTION4("10004", "4*******异常"),
EXCEPTION5("10005", "5*******异常"),
ERROR("-1", "失败");
private String code;
private String msg;
private ReturnMsg (String code, String msg) {
this.code = code;
this.msg = msg;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
2.封装结果集
/**
* <p>Title: ReturnResult.java</p>
* <p>Description: 返回封裝結果集</p>
* @author shy
* @Version 1.0
* @Date 2018年7月3日上午10:36:40
*/
public class ReturnResult {
private long total;
private Object data;
private String code;
private String msg;
private ReturnResult(long total, Object data, String code, String msg) {
this.total = total;
this.data = data;
this.code = code;
this.msg = msg;
}
private ReturnResult(Object data) {
this.data = data;
this.code = ReturnMsg.SUCCESS.getCode();
this.msg = ReturnMsg.SUCCESS.getMsg();
}
private ReturnResult(long total, Object data) {
this.total = total;
this.data = data;
this.code = ReturnMsg.SUCCESS.getCode();
this.msg = ReturnMsg.SUCCESS.getMsg();
}
private ReturnResult(String code, String msg) {
this.code = code;
this.msg = msg;
}
private ReturnResult() {
this.code = ReturnMsg.ERROR.getCode();
this.msg = ReturnMsg.ERROR.getMsg();
}
/***
* 输入参数:
*
* @param total
* @param data
* @param code
* @param msg
* @return 返回成功,包含total、code、msg、data
*/
public static ReturnResult success(long total, Object data, String code, String msg) {
return new ReturnResult(total, data, code, msg);
}
/***
* 输入参数
*
* @param total
* @param data
* @return 返回成功,包含total、code、msg、data
*/
public static ReturnResult success(long total, Object data) {
return new ReturnResult(total, data);
}
/***
* 输入参数:
*
* @param data
* @return 返回成功,包含code、msg、data
*/
public static ReturnResult success(Object data) {
return new ReturnResult(data);
}
/***
* 无输入参数 返回成功,包含code、msg
*
* @return
*/
public static ReturnResult success() {
return new ReturnResult("");
}
/***
* 无输入参数 返回失败,包含code、msg
*
* @return
*/
public static ReturnResult error() {
return new ReturnResult();
}
public static ReturnResult error(String code, String msg) {
return new ReturnResult(code, msg);
}
public long getTotal() {
return total;
}
public void setTotal(long total) {
this.total = total;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
3.代码使用
@RequestMapping(value = "/list")
@ResponseBody
public ReturnResult getEmpList() throws IOException {
String name = "admin_1";
PageHelper.startPage(2, 2);
PageHelper.orderBy("age");
List<Emp> empList = null;
long total = -1;
try {
empList = empService.queryEmpList(name);
if (null == empList || empList.isEmpty()) {
return ReturnResult.error(ReturnMsg.EXCEPTION2.getCode(), ReturnMsg.EXCEPTION2.getMsg());
}
PageInfo<Emp> pageEmp = new PageInfo<Emp>(empList);
total = pageEmp.getTotal();
empList = pageEmp.getList();
System.out.println(total);
} catch (Exception e) {
ReturnResult.error(ReturnMsg.EXCEPTION1.getCode(), ReturnMsg.EXCEPTION1.getMsg());
}
return ReturnResult.success(total, empList);
}
4.输出
total 4
data
0
empno 2
empname "admin_1"
age 33
sex 2
indate 1529596800000
deptno 30
1
empno 4
empname "admin_4"
age 44
sex 2
indate 1529856000000
deptno 10
code "0"
msg "成功"