AngularJs跨域请求Java的实现---博客园老牛大讲堂

一、首先angularJs实现跨域请求java思路

　　首先我先介绍一下Html端（前端），然后介绍一下后端java（后端采用MVC模式）。

二、$Http跨域请求方式跨域请求

　　前端代码：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <!--博客园老牛大讲堂-->
        <script src="../js/angular.min.js"></script>
    </head>
    <body>
        
        <div ng-app="myApp" ng-controller="siteCtrl">
            
        <script>
            //博客园老牛大讲堂
            
            //总的来说下面的模块是固定的。跨域就按下面写
            var app = angular.module('myApp', []);
            app.controller('siteCtrl', function($scope, $http) {
                var k=$http({
                    method:'post',
                    url: "http://127.0.0.1:8080/A/B",
                    data:{id:"1",name:"老牛大讲堂"},
                    headers:{'Content-Type': 'application/x-www-form-urlencoded'},
                    transformRequest: function(obj) {
                        
                        console.log(obj);//输出的结果是请求的参数object
                        var str = [];
                        for(var p in obj){
                                str.push(encodeURIComponent(p) + "=" + encodeURIComponent(obj[p]));
                        }
                        return str.join("&");
                    },
                    responseType:"text"
                });
                //博客园老牛大讲堂
                k.success(function(data){
                    console.log(data);//请求后的输出数据
                    console.log(data.firstName);//根据属性得到数据的值
                    //博客园老牛大讲堂
                });
            });
        </script>
    </body>
</html>

　　后端代码,关于java的json包装

package Serlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import Tools.A;

public class B extends HttpServlet {
    
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request,response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //http://127.0.0.1:8080/A/B?id=1&name=张三      //这个是访问路径加参数
        
//博客园老牛大讲堂
　　　　　　//下面加的头部是必须的，这是要求谁可以请求，谁不能请求
        response.setHeader("Access-Control-Allow-Origin","*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE");  
        response.setHeader("Access-Control-Max-Age", "3600");  
        response.setHeader("Access-Control-Allow-Headers", "x-requested-with, Content-Type");  
        response.setHeader("Access-Control-Allow-Credentials", "true");  
    //博客园老牛大讲堂
        String id=new String(request.getParameter("id").getBytes("ISO-8859-1"),"GBK");
        String name=new String(request.getParameter("name").getBytes("ISO-8859-1"),"GBK");
        System.out.println("用户的id是："+id+"他的名字是："+name);
        //博客园老牛大讲堂
        String jsoncallback = "{"firstName":"Brett"}";//模拟一个固定的json数据，将来要用第三方jar包进行包装。
        PrintWriter out = response.getWriter();
        out.println(jsoncallback);
        out.flush();
        out.close();
        
    }
}