Angular4 JSONP + JAVA代码

一、在app.module.ts模块中，注入JsonpModule模块

import {JsonpModule} from "@angular/http";

@NgModule({

    imports: [

        JsonpModule    //注入JSonpModule模块

    ]

})

二、创建服务httpService，并注入jsonp和map（分装好的服务 可以直接调用）

import {Injectable} from '@angular/core';

import {Jsonp, URLSearchParams} from "@angular/http";

@Injectable()

export class HttpService {

    private jsonpTimes = 0;   // 用于记录jsonp请求的次数

    constructor(private jsonp: Jsonp) {

    }

    jsonpGet(apiURL, req){

        let params = new URLSearchParams();

        //设置参数

        for (let key in req) {

            params.set(key, req[key]);

        }

        params.set('format', 'json');

        params.set("callback", `__ng_jsonp__.__req${this.jsonpTimes}.finished`);

        this.jsonpTimes++;

        let request = this.jsonp.get(apiURL, { search: params })

            .map((res) => {

                let response = res.json();

                return response;

            });

        return request;

    }

}

三、业务组件调用httpService

let newUrl = localServer + "/search"; //查询网址 

let req = { id: 123, name: "abc" }; //查询参数

this.httpService.jsonpGet(newUrl, req).subscribe(data => {

            let result = data.data;

        });

后端JAVA代码

@RequestMapping(value = "mergeJson")

     public void exchangeJson(HttpServletRequest request,HttpServletResponse response)  throws Exception {

              String businessnum = request.getParameter("businessnum");

              String paths = request.getParameter("paths");

              List<String>  pathList =  Arrays.asList( paths.split(","));

              List<String> resultPath = mergeService.merge(businessnum, pathList);

              String return_JSONP = String.join(",", resultPath);

              String jsonCallback = request.getParameter("callback"); //jsonpCallback 客户端请求参数

              Map<String,Object> map = new HashMap<>();

              map.put("data",return_JSONP);

              JSONObject resultJSON = new JSONObject(map);//根据需要拼装json

              PrintWriter pw = response.getWriter();

              pw.write(jsonCallback+"("+resultJSON+")");

              pw.close();

              pw = null;

        }  

参考资料：https://www.cnblogs.com/minigrasshopper/p/7692368.html