java - 使用 httpPost 从 java 发送时，node.js req.body 为空

Question

当我尝试将一些 json 发送到我的 node.js 服务器时，req.body 为空，我不知道为什么。我发送的 header 已收到。

这是java代码:

        HttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);
        StringEntity se = new StringEntity(json, "UTF8");

        httpPost.setEntity(se);
        httpPost.setHeader("Accept", "application/json");
        httpPost.setHeader("Content-type", "application/json");
        httpPost.setHeader("test", "test");

        HttpResponse httpResponse = httpClient.execute(httpPost);

这是 Node.js 代码:

exports.checkMail = function(req, res) {
    var user = req.body;
    var header = req.headers;
    var email = user.email;
    db.collection('users', function(err, collection) {
        collection.findOne({'email':email}, function(err, item) {
            if (item) {
                res.send({'error':0, 'message':'email available'});
            } else {
                res.send({'error':4, 'message':'email already taken'});
            }
        });
    });
};

你知道我可能会错过什么吗？

编辑:

抱歉忘了提及。我用的是 express 。 我发送的 json 是:

{"email":"email@email.com"}

我从 req.body 得到的只是:{}

编辑2:

app.js

    var express = require('express'),
        post = require('./routes/posts'),
        user = require('./routes/user');

    var app = express();

    app.configure(function () {
        app.use(express.logger('dev'));
        app.use(express.bodyParser());
        //app.use(express.json());
        //app.use(express.urlencoded());
    });

    app.get('/auth',            user.login); 
    app.post('/auth',           user.addUser);
    app.put('/auth/:id',        user.updateUser); 
    app.post('/checkmail',      user.checkMail);  
    app.post('/reset',          user.resetPassword); 

    app.listen(8080);
    console.log('Listening on port 8080...');

Answer 1

可能来不及回答，但如果有人遇到同样的问题，这对我有用:

//It is important that if we are sending a Content-Type application/json, the entity has to receive a json 
JSONObject js = new JSONObject();
js.put("key", value);
String url = "http://mylocalhosturl";
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
StringEntity entity = new StringEntity(js.toString(), HTTP.UTF_8);

//Setting the content type is very important
entity.setContentEncoding(HTTP.UTF_8);
entity.setContentType("application/json");
httpPost.setEntity(entity);

//Execute and get the response.
HttpResponse response = httpClient.execute(httpPost);

希望这对某人有帮助。