在拦截器中如何将修改后的请求体放回到 HttpServletRequest 对象中
时间: 2024-02-04 22:02:17 浏览: 137
在拦截器中,修改后的请求体可以通过实现HttpServletRequestWrapper类来放回HttpServletRequest对象中。
具体实现步骤如下:
1. 创建一个类,继承HttpServletRequestWrapper类。
2. 重写该类的 getReader() 和 getInputStream() 方法,使它们返回一个新的Reader和InputStream对象,这些对象包含修改后的请求体。
3. 在拦截器中,使用该类的构造方法创建一个新的HttpServletRequestWrapper对象,将该对象传递给FilterChain对象的doFilter()方法,以便在过滤器链中的下一个过滤器或Servlet中使用。
例如:
```
public class MyHttpServletRequestWrapper extends HttpServletRequestWrapper {
private final byte[] body;
public MyHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
super(request);
body = IOUtils.toByteArray(request.getInputStream());
}
@Override
public ServletInputStream getInputStream() throws IOException {
final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body);
return new ServletInputStream() {
@Override
public int read() throws IOException {
return byteArrayInputStream.read();
}
};
}
@Override
public BufferedReader getReader() throws IOException {
return new BufferedReader(new InputStreamReader(getInputStream()));
}
}
```
在拦截器中调用该类:
```
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
MyHttpServletRequestWrapper requestWrapper = new MyHttpServletRequestWrapper(req);
chain.doFilter(requestWrapper, response);
}
```
阅读全文