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EtagController.java
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57 lines (50 loc) · 1.91 KB
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package com.ziyuan.etag;
import com.alibaba.fastjson.JSON;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
/**
* EtagController
*
* @author ziyuan
* @since 2017-09-13
*/
@RestController
public class EtagController {
private static List<Demo> demos = new ArrayList<>();
static {
demos.add(new Demo("ziyuan", "123"));
}
@ResponseBody
@RequestMapping(value = "/get", method = {RequestMethod.POST, RequestMethod.GET})
public ResultUtil etag(HttpServletRequest request, HttpServletResponse response) throws IOException {
String tag = String.valueOf(demos.size());
response.setHeader("ETag", tag);
String previousTag = request.getHeader("If-None-Match");
if (previousTag != null && previousTag.equals(tag)) {
response.sendError(HttpServletResponse.SC_NOT_MODIFIED);
response.setHeader("Last-Modified", request.getHeader("If-Modified-Since"));
return new ResultUtil();
} else {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.MILLISECOND, 0);
Date lastModified = cal.getTime();
response.setDateHeader("Last-Modified", lastModified.getTime());
}
return new ResultUtil().setSuccessData(demos);
}
@ResponseBody
@RequestMapping(value = "/add", method = {RequestMethod.POST, RequestMethod.GET})
public ResultUtil etagAdd() {
demos.add(new Demo("juecai", "123"));
return new ResultUtil().setSuccessData(demos);
}
}