java http接口在本地能跑通，在服务器上跑就不通

Question

httpExchange写的http post接口，通过get一个url，返回json，再通过接口返回。在本地都能用postman通过，但是放到服务器上就不通。

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;

import java.io.OutputStream;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
/**
 * 处理/myserver路径请求的处理器类
 */
public class jbxx implements HttpHandler {
    @Override
    public void handle(HttpExchange httpExchange) {
        try {
            StringBuilder responseText = new StringBuilder();
            responseText.append(getRequestParam(httpExchange));
            handleResponse(httpExchange, responseText.toString());
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /**
     * 获取请求参数
     * @param httpExchange
     * @throws Exception
     */
    private JSONObject getRequestParam(HttpExchange httpExchange) throws Exception {
        String paramStr = "";
        paramStr = httpExchange.getRequestURI().getQuery();
        String[] s1=paramStr.split("=");
        JSONObject obj4=null;
        if(s1[0].equals("sfz")){
            tool tool = new tool();
        String url ="";
        String timeStamp = Long.toString(System.currentTimeMillis() / 100000);
        String param ="appId=8&appName=DExchange&timeStamp="+timeStamp;
        String a = tool.sendGet(url,param);
        JSONObject obj= JSON.parseObject(a);
        String appcode =obj.getString("data");
        String url2=url;
        String bm = tool.bm(s1[1]);
        String param2 ="zjhm="+bm+"&appCode="+appcode+"" +
                "&apiToken=88";
        String b = tool.sendGet(url2,param2);
        JSONObject obj2= JSON.parseObject(b);
        JSONArray obj3= JSON.parseArray(obj2.getString("data"));
        if (obj3.size() == 0) {
            String resultMsg ="{\"resultMsg\":\"没有查询到对应的信息\"}";
            obj4= JSON.parseObject(resultMsg);
        }else {
            obj4 = JSON.parseObject(obj3.getString(0));
        }
    }
        return obj4;
    }
    /**
     * 处理响应
     * @param httpExchange
     * @param responsetext
     * @throws Exception
     */
    private void handleResponse(HttpExchange httpExchange, String responsetext) throws Exception {
        //生成html
        StringBuilder responseContent = new StringBuilder();
        responseContent.append(responsetext);
        String responseContentStr = responseContent.toString();
        byte[] responseContentByte = responseContentStr.getBytes("utf-8");
        //设置响应头，必须在sendResponseHeaders方法之前设置！
        httpExchange.getResponseHeaders().add("Content-Type:application/x-www-form-urlencoded", "text/html;charset=utf-8");
        //设置响应码和响应体长度，必须在getResponseBody方法之前调用！
        httpExchange.sendResponseHeaders(200, responseContentByte.length);
        OutputStream out = httpExchange.getResponseBody();
        out.write(responseContentByte);
        out.flush();
        out.close();
    }
}

Answer 1

一般来说，不会有区别；

如果你服务器上不能操作；
那么，你需要检查服务器；
1、比如防火墙有没有放开；

2、服务有没有正常启动