java后台服务器向Nodejs客户端发送压缩包文件

java代码：

            Map map = new HashMap();
            String fileStr = getFileStr(path);//这里path就是我们服务器上的文件存放路径
            map.put("appFileStr", fileStr);
 　　　　　　 String result = HttpClientUtil.callHttpPost(ip, port, "reciveFile", map);
     public String getFileStr(String path) {//这里是我们封装好的读取文件获得的并经过BASE64加密之后的字符串的方法
        String resultStr = "";
        try {
            int b;
            File file = new File(path);
            byte[] temp = new byte[(int) (file.length())];
            FileInputStream inputstream = new FileInputStream(file);//本地文件的输入流
            BufferedInputStream in = new BufferedInputStream(inputstream);
            StringBuffer fileStr = new StringBuffer();
            BASE64Encoder encoder = new BASE64Encoder();
            while ((b = in.read(temp)) != -1) {
                fileStr.append(encoder.encode(temp));
            }
            inputstream.close();
            resultStr = fileStr.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return resultStr;
    }

Node.js客户端代码：

/**
 * Created by Administrator on 2019/12/23.
 *指尖敲打着世界 ----一个阳光而又不失帅气的少年！！！.
 */
var express=require('express'); /*引入*/
var bodyParser = require('body-parser');
var fs=require("fs");
var app=new express();  /*实例化*/
//配置body-parser中间件
// parse application/x-www-form-urlencoded//处理表单数据
app.use(bodyParser.urlencoded({ extended: false }))
// parse application/json                 //处理json数据

app.use(bodyParser.json({limit : "2100000kb"}));

app.post('/reciveFile',function(req,res){ var app = new Buffer.from(req.body.appFileStr, 'base64'); fs.writeFileSync("D:/upload/writeFileTest.zip",app);//注意：writeFile写入的文件zip打不开，具体原因不明，同道高人如果知晓，希望能够指点一二 res.send({retMsg: '收到发送文件流请求，正在接收', retCode: "1"}); }) app.listen(8089);

附录HttpClientUtil代码：

package com.yxjr.common.utils;

import net.sf.json.JSONObject;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import java.io.UnsupportedEncodingException;
import java.util.Map;

public class HttpClientUtil {
    //post提交调用方法
    public static String callHttpPost(String hostIP, int port, String actionName, Map<String,String> paramsMap)
            throws UnsupportedEncodingException {
        JSONObject resultJSon = new JSONObject();
        String callbackResult = "";
        System.err.println("请求参数是： IP" + hostIP + "   actionName:" + actionName + "  params:" + paramsMap);
        HttpClient httpClient = new DefaultHttpClient();
        StringBuilder url = new StringBuilder("http://");
        if (hostIP != null && !"".equals(hostIP) && !"".equals(actionName) && actionName != null) {
            url.append(hostIP).append(":").append(String.valueOf(port)).append("/").append(actionName);
        }
//        if (hostIP != null && !"".equals(hostIP) && !"".equals(actionName) && actionName != null) {
//            url.append(hostIP).append(":").append(String.valueOf(port)).append("/")
//                    .append(baseUrl).append("/").append(actionName);
//        }
        System.out.println(url);
        String str ="";
        if(paramsMap!=null &&  paramsMap.size()!=0){
            str = JSONObject.fromObject(paramsMap).toString();
        }
        System.err.println("请求参数为："+ str);
        HttpPost httpPost = new HttpPost(url.toString());
        StringEntity entity = new StringEntity(str, "utf-8");
        //entity.setContentEncoding("utf-8");
        entity.setContentType("application/json");
        httpPost.setEntity(entity);
        try {
            HttpResponse response = httpClient.execute(httpPost);
            int statusCode = response.getStatusLine().getStatusCode();
            String entityString = EntityUtils.toString(response.getEntity());
            System.err.println("请求返回码为："+ String.valueOf(statusCode)+"  返回结果为:" +entityString);
            if(statusCode==200 ){
                callbackResult = entityString;
            }else{
                resultJSon.put("retCode",-1);
                resultJSon.put("retMsg","请求异常，请检查请求内容");
                resultJSon.put("resultCode",statusCode);
                callbackResult = resultJSon.toString();
            }
        } catch (Exception e) {
            System.err.println("客户端连接异常："+e.getMessage());
            resultJSon.put("retCode",-2);
            resultJSon.put("retMsg","连接异常，请检查客户端机服务是否正常开启");
            resultJSon.put("resultCode",500);
            callbackResult = resultJSon.toString();
            e.printStackTrace();
        }
        return callbackResult;
    }

}