给HttpServletRequest设置Header

要给HttpServletRequest设置Header，可以通过自定义类继承HttpServletRequestWrapper并重写addHeader方法来实现。首先，我们可以创建一个名为HeaderMapRequestWrapper的类，并继承HttpServletRequestWrapper。在该类中，我们可以重写addHeader方法，在该方法中通过super.addHeader方法将新的Header添加到请求中。以下是示例代码：

public class HeaderMapRequestWrapper extends HttpServletRequestWrapper {
    private final Map<String, String> customHeaders;

    public HeaderMapRequestWrapper(HttpServletRequest request) {
        super(request);
        this.customHeaders = new HashMap<>();
    }

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

    @Override
    public String getHeader(String name) {
        String headerValue = customHeaders.get(name);
        if (headerValue != null) {
            return headerValue;
        }
        return super.getHeader(name);
    }

    @Override
    public Enumeration<String> getHeaderNames() {
        List<String> headerNames = new ArrayList<>(customHeaders.keySet());
        Enumeration<String> originalHeaderNames = super.getHeaderNames();
        while (originalHeaderNames.hasMoreElements()) {
            String headerName = originalHeaderNames.nextElement();
            if (!headerNames.contains(headerName)) {
                headerNames.add(headerName);
            }
        }
        return Collections.enumeration(headerNames);
    }
}

然后，在具体使用的地方，比如在过滤器(Filter)的doFilter方法中，可以创建一个HeaderMapRequestWrapper对象，并调用其addHeader方法来设置新的Header。以下是示例代码：

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) {
    HttpServletRequest request = (HttpServletRequest) servletRequest;
    String token = request.getHeader("token");
    // 获取其他需要的值
    // ...

    HeaderMapRequestWrapper requestWrapper = new HeaderMapRequestWrapper(request);
    requestWrapper.addHeader("headerName", "headerValue");

    try {
        filterChain.doFilter(requestWrapper, servletResponse);
    } catch (Exception e) {
        e.printStackTrace();
        log.error("处理请求头异常");
    }
}

通过自定义HttpServletRequestWrapper和添加新的Header，我们可以实现给HttpServletRequest设置Header的功能。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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