HttpServletRequest修改header值

最新推荐文章于 2024-09-23 10:27:35 发布

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最新推荐文章于 2024-09-23 10:27:35 发布

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本文介绍了一种自定义HttpServletRequest的方法，通过继承HttpServletRequestWrapper实现对HTTP请求头部信息的修改与扩展。此方案适用于需要动态调整请求头的应用场景。

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默认HttpServletRequest是没有修改Header值得方法, 不过我们可以自定义类继承HttpServletRequestWrapper

具体代码如下:

import lombok.extern.slf4j.Slf4j;

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


@Slf4j
public class HeaderMapRequestWrapper extends HttpServletRequestWrapper {
    /**
     * construct a wrapper for this request
     *
     * @param request
     */
    public HeaderMapRequestWrapper(HttpServletRequest request) {
        super(request);
    }

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

    /**
     * add a header with given name and value
     *
     * @param name
     * @param value
     */
    public void addHeader(String name, String value) {
        headerMap.put(name, value);
    }

    @Override
    public String getHeader(String name) {
        log.info("getHeader --->{}",name);
        String headerValue = super.getHeader(name);
        if (headerMap.containsKey(name)) {
            headerValue = headerMap.get(name);
        }
        return headerValue;
    }

    /**
     * get the Header names
     */
    @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) {
        log.info("getHeaders --->>>>>>{}",name);
        List<String> values = Collections.list(super.getHeaders(name));
        log.info("getHeaders --->>>>>>{}",values);
        if (headerMap.containsKey(name)) {
            log.info("getHeaders --->{}",headerMap.get(name));
            values = Arrays.asList(headerMap.get(name));
        }
        return Collections.enumeration(values);
    }
}

使用方式:

HeaderMapRequestWrapper requestWrapper = new HeaderMapRequestWrapper(HttpServletRequest);

//添加或修改 header值
requestWrapper.addHeader("Token", "token");