No 'Access-Control-Allow-Origin' 解决办法
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解决方法：跨源问题，添加cors。
1.filter或者servlet里面添加response.setHeader("Access-Control-Allow-Origin", "*");
2.response.setHeader("Access-Control-Allow-Origin", "*");放到接收客户端api 的地方
3.如果是servlet的话就放到get或者post方法里面，jsp页面就扔到第一行
4.如果是filter部署就扔到dofilter()阅读全文
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