在Filter中加入Header

關於請求頭參考這位博主的https://blog.csdn.net/alexshi5/article/details/80379086（感謝博主）

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.util.*;

/**
 * [ Filter請求攔截中添加header屬性 ]
 *
 * @author Love丶TG
 * @version 1.0.0
 * @create 2019 年 11 月 22 日 11:44
 */
public class HeaderMapRequestWrapper extends HttpServletRequestWrapper {

    public HeaderMapRequestWrapper(HttpServletRequest request) {
        super(request);
    }

    private Map<String, String> headerMap = new HashMap<String, String>();

    public void addHeader(String name, String value) {
        headerMap.put(name, value);
    }

    @Override
    public String getHeader(String name) {
        String headerValue = super.getHeader(name);
        if (headerMap.containsKey(name)) {
            headerValue = headerMap.get(name);
        }
        return headerValue;
    }

    @Override
    public Enumeration<String> getHeaderNames() {
        List<String> names = Collections.list(super.getHeaderNames());
        for (String name : headerMap.keySet()) {
            names.add(name);
        }
        return Collections.enumeration(names);
    }

    @Override
    public Enumeration<String> getHeaders(String name) {
        List<String> values = Collections.list(super.getHeaders(name));
        if (headerMap.containsKey(name)) {
            values.add(headerMap.get(name));
        }
        return Collections.enumeration(values);
    }
}

 通過上面這個類，然後簡單在Filter中New對象使用即可。

HeaderMapRequestWrapper requestWrapper = new HeaderMapRequestWrapper(req);
requestWrapper.addHeader("token", "123456");

 到此就成功可用了。