# BaseController 基础Controller 工具类

BaseController 基础Controller 工具类

• 工具类BaseController没啥好说的直接上代码：获取参数、分页查询、当前用户获取、EsSql查询分装等

/**
 * @description: 基础的类
 * @author: Lidong
 * @time: 2020/7/29 21:14
 **/
public class BaseController {
    
    

    private static final Logger logger = LoggerFactory.getLogger(BaseController.class);

    @Autowired
    protected HttpServletRequest request;

    /**
     * @return java.util.Map<java.lang.String, java.lang.String>
     * @Author LiDong
     * @Description //TODO 处理HttpServletRequest拿到参数的Map
     * @Date 20:17 2020/11/30
     * @Param [request]
     **/
    public Map<String, String> getParamMap(HttpServletRequest request) {
    
    
        try {
    
    
            if (Objects.isNull(this.request)) {
    
    
                this.request = ((ServletRequestAttributes) (RequestContextHolder.currentRequestAttributes())).getRequest();
            }
            Map<String, String[]> parameterMap = this.request.getParameterMap();
             Map<String, String> map = new HashMap<>(16);
            if (parameterMap != null && parameterMap.size() > 0) {
    
    
                for (String key : parameterMap.keySet()) {
    
    
                    String[] strings = parameterMap.get(key);
                    String value = Arrays.asList(strings).get(0);
                    map.put(key, String.valueOf(value));
                }
                return map;
            }
            return new HashMap<>(1);
        } catch (Exception e) {
    
    
            logger.error("=====>getParamMap()出错", e.getMessage(), e);
            return new HashMap<>(1);
        }
    }

    /**
     * @return com.li.core.domain.common.CurrentUser
     * @Author LiDong
     * @Description //TODO 得到当前Session中的信息
     * @Date 20:07 2020/11/30
     * @Param []
     **/
    public CurrentUser getCurrentUser() {
    
    
        try {
    
    
            if (Objects.isNull(request)) {
    
    
                request = ((ServletRequestAttributes) (RequestContextHolder.currentRequestAttributes())).getRequest();
            }
            Object user = request.getSession().getAttribute("user");
            if (user == null) {
    
    
                return null;
            }
            CurrentUser currentUser = (CurrentUser) user;
            return currentUser;
        } catch (Exception e) {
    
    
            logger.error("=====>getCurrentUser()出错", e.getMessage(), e);
            return null;
        }

    }

    /**
     * 封装Post查询Es中的结果
     */
    public String getEsResultBysql(String sql) {
    
    
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
    
    
            // 请求的Url
            String urlLocation = "http://127.0.0.1:9200/_sql";
            // 请求体
            String content = "{\"query\":\"" + sql + "\"}";
            URL realUrl = new URL(urlLocation);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            ((HttpURLConnection) conn).setRequestMethod("POST");
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(content);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
    
    
                result += line;
            }
        } catch (Exception e) {
    
    
            System.out.println("发送 POST 请求出现异常！" + e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally {
    
    
            try {
    
    
                if (out != null) {
    
    
                    out.close();
                }
                if (in != null) {
    
    
                    in.close();
                }
            } catch (IOException ex) {
    
    
                ex.printStackTrace();
            }
        }
        return result;
    }

    /**
     * @return void
     * @Author LiDong
     * @Description //TODO 分页查询
     * @Date 20:17 2020/11/30
     * @Param [request]
     **/
    public void getPageInit(HttpServletRequest request) {
    
    
        try {
    
    
            Map<String, String> paramMap = getParamMap(request);
            int pagenumber = Integer.parseInt(paramMap.getOrDefault("pageNumber", "1"));
            int pagesize = Integer.parseInt(paramMap.getOrDefault("pageSize", "10"));
            PageHelper.startPage(pagenumber, pagesize);
        } catch (Exception e) {
    
    
            logger.info("=====>getPage()出错！", e.getMessage(), e);
        }
    }

}