dsProject/ds-gw/src/main/java/com/dsideal/gw/Handler/RouterHandler.java

package com.dsideal.gw.Handler;

import cn.hutool.json.JSONObject;
import com.jfinal.handler.Handler;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;


public class RouterHandler extends Handler {
    /**
     * 功能：输出JSON文本串
     * @param res
     * @param jo
     */
    public void renderJson(HttpServletResponse res, JSONObject jo) {
        res.setHeader("Access-Control-Allow-Origin", "*");
        res.setHeader("Cache-Control", "no-cache");
        res.setCharacterEncoding("UTF-8");
        res.setContentType("application/json");
        try {
            res.getWriter().println(jo);
            res.getWriter().flush();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public void renderJson(HttpServletResponse res, String msg) {
        renderJson(res, new JSONObject().put("msg", msg));
    }

    @Override
    public void handle(String target, HttpServletRequest req, HttpServletResponse res, boolean[] isHandled) {

        //可以正确获取到URL的完整路径
        String servletPath = req.getServletPath();

        JSONObject jo = new JSONObject();
        Map<String, Object> _map = new HashMap<>();
        _map.put("servletPath", servletPath);
        _map.put("success", true);
        jo.putAll(_map);

        if (req.getMethod().equals("GET")) {
            renderJson(res, "现在调用是GET！");
        } else if (req.getMethod().equals("POST")) {
            renderJson(res, "现在调用是POST！");
        } else if (req.getContentType() != null && req.getContentType().contains("multipart/form-data")) {
            renderJson(res, "现在调用是上传操作！");
        } else {
            renderJson(res, "系统只支持GET,POST和文件上传，其它的OPTIONS不允许！");
        }
        //输出结果
        renderJson(res, jo);
        //停止filter
        isHandled[0] = true;
    }
}