利用jsonp是ajax可跨域请求数据 , 具体参考 http://www.cnblogs.com/digdeep/p/4170059.html
1、部署后端controller类到springmvc的相应文件目录中
2、将前端文件部署到tomcat中，其项目名称为examples，端口为8080
3、在浏览器中输入已下url值并回车
http://localhost:8080/examples/demo.html?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJyb2xlIjoiYWRtaW4iLCJhY2NvdW50IjoiZmVueGlqdWVjZTEyMyIsInVzZXJJZCI6ImRjZjY0YjdhMTI1ZDQwYTQ5OTEwODFjMGRjZGNkZDgyNTliZWM4OGFjMGMyNDJlZmE0ODY2YmEzOGYyMzRkZmUiLCJpc3MiOiJyZXN0YXBpdXNlciIsImF1ZCI6IjA5OGY2YmNkNDYyMWQzNzNjYWRlNGU4MzI2MjdiNGY2IiwiZXhwIjoxNDk0NTk0OTA4LCJuYmYiOjE0OTQ0MjIxMDh9.s8nbOsmxndQ20R0yRSeO4e01B2Ppw23p5BgN3XFds_c