java开发——使用泛型返回统一的对象给请求端

最新推荐文章于 2024-07-08 02:58:03 发布

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本文介绍如何在Java开发中利用泛型创建一个通用的方法，以返回统一格式的对象到请求端。通过给出的调用实例，展示了如何在用户注册（添加用户）接口中应用此技术，返回包含userName和password信息的JSON响应。

代码如下：

public class WebResult<T> {
    private T data;
    private int code;
    private String message;
    public WebResult() {
    }

    public WebResult(T data) {
        this.data = data;
    }
    private enum CodeType {
        ERROR(-1, "失败"),
        SUCCESS(0, "成功");

        private int value;
        private String descript;

        CodeType(int value, String descript) {
            this.value = value;
            this.descript = descript;
        }

        @Override
        public String toString() {
            return this.descript;
        }
    }

    public WebResult success() {
        code = CodeType.SUCCESS.value;
        message = CodeType.SUCCESS.toString();
        return this;
    }

    public WebResult error() {
        code = CodeType.ERROR.value;
        message = CodeType.ERROR.toString();
        return this;
    }

    public WebResult success(String message) {
        code = CodeType.SUCCESS.value;
        this.message = message;
        return this;
    }

    public WebResult error(String message) {
        code = CodeType.ERROR.value;
        this.message = message;
        return this;
    }

    
    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

}

调用实例：

    @ResponseBody
    @RequestMapping("/addUser.do")
    public WebResult addUser(String userName, String password) {
        Map<String, Object> userMap = new HashMap<>();
        userMap.put("345", new User("小明", "567567"));
        List<User> users = new ArrayList<>();
        users.add(new User("李小龙", "134134"));
        users.add(new User("小李", "134134"));
        userMap.put("userList", users);
        //map、list等对象随便放
        if (userName == null && password == null) {
            return new WebResult().error("参数错误！");
        }
        User user = new User(userName, password);
        boolean isSuccess = userService.addUser(user);
        if (isSuccess)
            return new WebResult<>(userMap).success();
        else
            return new WebResult<>(userMap).error("添加失败！");
    }

访问地址：http://localhost:8081/user/addUser.do?userName=river&password=123456

返回json：

{"data":{"userList":[{"userName":"李小龙","password":"134134"},{"userName":"小李","password":"134134"}],"345":{"userName":"小明","password":"567567"}},"code":0,"message":"成功"}

觉得有用的老铁给我博客赞一下呗！