【正经贴】解决get，post请求跨域问题

get 请求解决方案:jsonp
前端请求:

function queryTrouble(typeId){
    $.ajax({
        type: "GET",
        url: "https://xxx.com/v1/trouble/getTroubles",
        data: {typeId:typeId},
        xhrFields:{widthCredentials:true},
        dataType: "jsonp",
        cache:true,
        jsonpCallback: "Troublemycallback",
        success: function (data) {
            if(data.code==200){  
               alert("success");
            }
        }
    });
}

后端接收:

    @GetMapping(value = "getTroubles")
    public String getTroubles(int typeId, HttpServletRequest req){
        String callback = req.getParameter("callback");
        List lists = null; //走缓存 删减
        try {
            if(lists == null){
                lists = repairsTroubleService.getTroubles(typeId);
            }
        } catch (Exception e) {
            e.printStackTrace();
            return ResponseUtils.responseCORS(new Rsp(ResultStatus.error_search_failed),callback);
        }
        return ResponseUtils.responseCORS(new Rsp(lists),callback);
    }

public class ResponseUtils {


    public static String responseCORS(Object obj,String callback){
        return callback+"("+JSON.toJSONString(obj)+")";
    }
}

post跨域解决方案:xhr

前端请求:

function postSubmit(){
     var submitData = 'orderPlatform=1&brandId='+$("#Jbrand .needPost").data("brandid")+'&brandName='+$("#Jbrand .needPost").data("brandname")+'&typeId='+$("#Jbrand .needPost").data("typeid")+'&typeName='+$("#Jbrand .needPost").data("typename")+'&troubleName='+$("#Jtrouble .needPost").html()+'&color='+$("#Jcolor .needPost").html()+'&orderType='+$("#JrepireMode .needPost").data("mode")+'&orderStation='+$("#JrepairBranch .info p").html().replace("
"," ")+'&customer='+$("#JuserInfo .needPost[name=cusname]").val()+'&telephone='+$("#JuserInfo .needPost[name=mobile]").val()+'&address='+$("#Jaddress .seled").html()+$("#Jaddress .needPost[name=address]").val()+'&comments='+$(".item textarea[name=memo]").val()+'&price='+$("#Jtrouble .iptSelBox .cur").data("price");
        submitData = urlParamToJson(decodeURIComponent(submitData.replace(/\+/g," "),true));
    postCORS({
            url: "https://xxx.com/v1/order/add",
            data: submitData,
            init: function (data, xhr) {
                if (xhr) {
                    xhr.withCredentials = true
                }
            },
            callback: function (data) {
                eval('var result=' + data);
                if ( result.code == 200 ) {
                    location.href = "//xxx.com/success/index.html"
                } else {
                    alert(JSON.stringify(result));
                }
                ifSubmit = false;
            }
        });
}


function urlParamToJson(data_){
    var params = data_.split('&'),
    json = new Object(),
    param;
    for(var i = 0; i < params.length; i++){
    param = params[i].split('=');
    json[param[0]] = param[1];
    }
    return json;
}
function postCORS(b) {
	var e = createCORSRequest();
	if (!e) {
		b.init && b.init(b.data, e);
		var d = new Transfer({
			url: b.url,
			data: b.data,
			callback: function(f) {
				b.callback(f, {
					isXhr: false
				})
			}
		});
		d.send()
	} else {
		e.open("POST", b.url);
		b.init && b.init(b.data, e);
		e.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		e.onreadystatechange = function() {
			var f = {
				isXhr: true
			};
			if (e.readyState == 4) {
				if (e.status == 200 || e.status == 304) {
					f.status = "success";
					b.callback(e.responseText, f)
				} else {
					f.status = "error";
					b.callback(e, f)
				}
			}
		};
		var a = [];
		for (var c in b.data) {
			if (b.data.hasOwnProperty(c)) {
				a.push(encodeURIComponent(c) + "=" + encodeURIComponent(b.data[c]))
			}
		}
		e.send(a.join("&"))
	}
}
function createCORSRequest() {
	var b;
	try {
		b = new XMLHttpRequest();
		if (! ("withCredentials" in b)) {
			b = null
		}
	} catch(a) {
		b = null
	}
	return b
}
function Transfer(a) {
	this.url = a.url;
	this.callback = a.callback;
	this.params = a.data;
	a.options = a.options || {};
	var b = {
		localProxy: "/favicon.ico",
		defaultName: "cross.default.name"
	};
	this.options = this.extend(b, a.options);
	this.init()
}
Transfer.prototype = {
	init: function() {
		function a(h, f) {
			var g = null;
			try {
				g = document.createElement("<" + h + ' name="' + f + '">')
			} catch(i) {}
			if (!g || g.nodeName != h.toUpperCase()) {
				g = document.createElement(h);
				g.name = f
			}
			return g
		}
		this.params.windowname = 1;
		this.files = this.options.files || [];
		delete this.options.files;
		var b = "transfer_" + new Date().getTime();
		this.options.defaultName = b;
		var d = a("iframe", b);
		d.name = b;
		d.style.display = "none";
		d.style.position = "fixed";
		d.style.top = d.style.left = "-10000px";
		document.body.appendChild(d);
		var c = document.createElement("form");
		c.style.display = "none";
		c.target = b;
		c.action = this.url;
		c.method = "post";
		c.encoding = c.enctype = "application/x-www-form-urlencoded";
		document.body.appendChild(c);
		this.frame = d;
		this.form = c;
		this.state = 1;
		this._setRequest()
	},
	_setRequest: function() {
		var j = this,
		c = j.frame,
		a = j.form,
		k = j.options,
		i = k.localProxy;
		if (c.onreadystatechange !== undefined) {
			c.onreadystatechange = h
		} else {
			c.onload = h
		}
		function b() {
			var l;
			try {
				l = c.contentWindow.name
			} catch(m) {
				l = k.defaultName
			}
			if (l == k.defaultName) {
				l = '{"error": 1}'
			}
			j.callback(l)
		}
		function f() {
			var m = false;
			try {
				m = c.contentWindow.location.host == location.host
			} catch(l) {}
			return m
		}
		function g() {
			clearTimeout(d);
			c.onreadystatechange = c.onload = null;
			c.parentNode.removeChild(c);
			a.parentNode.removeChild(a);
			c = null;
			a = null;
			for (var l in j) {
				if (j.hasOwnProperty(l)) {
					j[l] = null;
					delete j[l]
				}
			}
		}
		var e = false;
		var d;
		function h() {
			try {
				if (c.contentWindow.location.href == "about:blank") {
					return
				}
			} catch(l) {}
			if (j.state == 3) {
				if (!f() && !e) {
					e = true;
					c.contentWindow.location = i
				} else {
					if (c.readyState && !(/complete|loaded/i.test(c.readyState))) {
						return
					}
					b();
					g()
				}
			}
			if (j.state == 2) {
				j.state = 3;
				c.contentWindow.location = i
			}
			if (!d) {
				d = setTimeout(function() {
					b();
					g()
				},
				120000)
			}
		}
	},
	send: function() {
		var e = this.params,
		b = this.form,
		h, j;
		var c = Object.prototype.toString;
		for (h in e) {
			if (e.hasOwnProperty(h)) {
				j = e[h];
				if (c.call(j) === "[object Array]") {
					var a = h + "[]";
					for (var f = 0,
					d = j.length; f < d; f++) {
						b.appendChild(g(a, j[f]))
					}
				} else {
					b.appendChild(g(h, j))
				}
			}
		}
		this.state = 2;
		b.submit();
		function g(k, l) {
			var i = document.createElement("input");
			i.name = k;
			i.value = l;
			return i
		}
	},
	isObject: function(a) {
		return Object.prototype.toString.call(a) == "[object Object]" && !a.nodeType
	},
	isArray: function(a) {
		return Object.prototype.toString.call(a) == "[object Array]"
	},
	extend: function(c, b) {
		var d = this.clone(b);
		var a;
		for (a in d) {
			if (d.hasOwnProperty(a)) {
				c[a] = d[a]
			}
		}
		return c
	},
	clone: function(f) {
		var c = this,
		d;
		if (c.isArray(f)) {
			d = [];
			for (var e = 0,
			a = f.length; e < a; e++) {
				d.push(c.clone(f[e]))
			}
		} else {
			if (c.isObject(f)) {
				d = {};
				for (var b in f) {
					if (f.hasOwnProperty(b)) {
						d[b] = c.clone(f[b])
					}
				}
			} else {
				d = f
			}
		}
		return d
	}
};

后端接收:

    @RequestMapping(value = "add",method = RequestMethod.POST)
    public void add(RepairsOrder repairsOrder, HttpServletResponse resp,HttpServletRequest req) throws Exception {
        // 封装数据格式
        JSONObject result = new JSONObject();
        try {
            if(repairsOrder.getOrderPlatform() != null){
                repairsOrderService.add(repairsOrder);
                result.put("code", 200);
                result.put("data", "success");
            }else{
                result.put("code", 500);
                result.put("data", "failure");
            }
        } catch (Exception e) {
            e.printStackTrace();
            result.put("code", 500);
            result.put("data", "failure");
        }

        // 指定编码
        resp.setContentType("text/json");
        resp.setCharacterEncoding("UTF-8");
        // 跨域处理
        resp.setHeader("Access-Control-Allow-Credentials", "true");
        resp.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS");

        if(req.getHeader("Origin") != null){
            resp.setHeader("Access-Control-Allow-Origin", req.getHeader("Origin"));
        }else{
            resp.setHeader("Access-Control-Allow-Origin", "*");
        }
        // 写入数据
        resp.getWriter().print(result);
        resp.flushBuffer();
    }

post跨域解决方案:ajax

前端请求:

function ajaxPost(){
    /*两种param都可以*/
     var param = "orderPlatform=1&brandId=1&brandName=发&typeId=1&typeName=C199&troubleName=坏&color=灰色&orderType=1&orderStation=大厦7楼705号&customer=小&telephone=&address=409&comments=备注&price=190";
   /* var param = {
	        orderPlatform:1,
	        brandId:1,
	        brandName:'发',
	        typeId:1,
	        typeName:'C199',
	        troubleName:'坏',
	        color:'灰色',
	        orderType:1,
	        orderStation:'大厦7楼705号',
	        customer:'小',
	        telephone:'',
	        address:'409',
	        comments:'备注',
	        price:190
	    } */

    $.ajax({
	        type: "POST",
	        url: "https://xxx.com/v1/order/add",
	        data: param,
	        success: function (res) {
	            if(res.code==200){
	            	alert("成功!");
	            }
	        },
	        error:function(res){
	            alert(res);
	        }
	    });
}

后端接收代码同上。

post跨域失败案例:ajax
前端不能指定contentType类型为json，后端接收参数不能使用@RequestBody

post会请求前会发送一次OPTIONS预请求按下面的例子是不会通过的

error：

前端代码:

 $.ajax({
	        type: "POST",
	        url: "https://xxx.vom/v1/order/add",
	        data: JSON.stringify(param),
			contentType: "application/json;charset=UTF-8",
	        success: function (res) {
	            if(res.code==200){
	            	alert("成功!");
	            }
	        },
	        error:function(res){
	            alert(res);
	        }
	    });

后端代码:

    @RequestMapping(value = "add",method = RequestMethod.POST)
    public void add(@RequestBodyRepairsOrder repairsOrder, HttpServletResponse resp,HttpServletRequest req) throws Exception {
        // 封装数据格式
        JSONObject result = new JSONObject();
        try {
            if(repairsOrder.getOrderPlatform() != null){
                repairsOrderService.add(repairsOrder);
                result.put("code", 200);
                result.put("data", "success");
            }else{
                result.put("code", 500);
                result.put("data", "failure");
            }
        } catch (Exception e) {
            e.printStackTrace();
            result.put("code", 500);
            result.put("data", "failure");
        }

        // 指定编码
        resp.setContentType("text/json");
        resp.setCharacterEncoding("UTF-8");
        // 跨域处理
        resp.setHeader("Access-Control-Allow-Credentials", "true");
        resp.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS");

        if(req.getHeader("Origin") != null){
            resp.setHeader("Access-Control-Allow-Origin", req.getHeader("Origin"));
        }else{
            resp.setHeader("Access-Control-Allow-Origin", "*");
        }
        // 写入数据
        resp.getWriter().print(result);
        resp.flushBuffer();
    }