微信小程式開發端

<!--index.wxml-->
<view class="container">
  <button bindtap='bindtest'>test</button>
</view>
----------------------------------------------------------------------------
//index.js
//獲取應用例項
const app = getApp()
Page({
  bindtest: function () {
    wx.request({
      url: 'http://localhost:8080/ZYJ_WXTest/WXServlet'
 
,
      data: {
        username: '張育嘉',
        password: '123'
      },
      method: 'POST',
      header: {
        //'content-type': 'application/json' // 預設值
        'Content-Type': 'application/x-www-form-urlencoded'
      },
      success: function (res) {
        console.log(res.data);
      },
      fail: function
 
 (res) {
        console.log(".....fail.....");
      }
    })
  }
})

請求資訊

Java端的Servlet

@WebServlet("/WXServlet")
public class WXServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //設定請求編碼
 

        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        /* 設定響應頭允許ajax跨域訪問 */
        response.setHeader("Access-Control-Allow-Origin", "*");
        /* 星號表示所有的異域請求都可以接受， */
        response.setHeader("Access-Control-Allow-Methods", "GET,POST");

        User user = new User();
        //獲取微信小程式get的引數值並列印
        user.setUsername(request.getParameter("username"));
        user.setPassword(request.getParameter("password"));
        System.out.println("username="+user.getUsername()+" ,password="+user.getPassword());
        //轉成json資料
        Map<String, Object> result = new HashMap<String, Object>();
        result.put("data", user);
        result.put("msg", "後臺已收到");
        //使用Gson類需要匯入gson-2.8.0.jar
        String json = new Gson().toJson(result);

        //返回值給微信小程式
        Writer out = response.getWriter();
        out.write(json);
        out.flush();
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

注意：使用Gson類需要匯入gson-2.8.0.jar