使用多个@RequestBody接收参数

﹏ヽ暗。殇╰゛Y 2022-10-12 15:52 220阅读 0赞

原因：常规情况下，因为request的body只能读取一次，@RequestBody也只能解析一次，这就导致解析第二个的@RequestBody的时候stream已经关闭了，无法再次读取。话不多说，上货：

解决办法：两个类，直接copy即可。

import javax.servlet.ReadListener;
    import javax.servlet.ServletInputStream;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletRequestWrapper;
    import java.io.*;
    
    public class BodyReaderRequestWrapper extends HttpServletRequestWrapper {
        private final String body;
    
        /**
         *
         * @param request
         */
        public BodyReaderRequestWrapper(HttpServletRequest request) throws IOException{
            super(request);
            StringBuilder sb = new StringBuilder();
            InputStream ins = request.getInputStream();
            BufferedReader isr = null;
            try{
                if(ins != null){
                    isr = new BufferedReader(new InputStreamReader(ins));
                    char[] charBuffer = new char[128];
                    int readCount = 0;
                    while((readCount = isr.read(charBuffer)) != -1){
                        sb.append(charBuffer,0,readCount);
                    }
                }else{
                    sb.append("");
                }
            }catch (IOException e){
                throw e;
            }finally {
                if(isr != null) {
                    isr.close();
                }
            }
    
            sb.toString();
            body = sb.toString();
        }
    
        @Override
        public BufferedReader getReader() throws IOException {
            return new BufferedReader(new InputStreamReader(this.getInputStream()));
        }
    
        @Override
        public ServletInputStream getInputStream() throws IOException {
            final ByteArrayInputStream byteArrayIns = new ByteArrayInputStream(body.getBytes());
            ServletInputStream servletIns = new ServletInputStream() {
                @Override
                public boolean isFinished() {
                    return false;
                }
    
                @Override
                public boolean isReady() {
                    return false;
                }
    
                @Override
                public void setReadListener(ReadListener readListener) {
    
                }
    
                @Override
                public int read() throws IOException {
                    return byteArrayIns.read();
                }
            };
            return  servletIns;
        }
    }

import org.springframework.stereotype.Component;
    
    import javax.servlet.*;
    import javax.servlet.annotation.WebFilter;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    @Component
    @WebFilter(filterName = "crownFilter", urlPatterns = "/*")
    public class BodyReaderRequestFilter implements Filter {
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
    
        }
    
        @Override
        public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) throws IOException, ServletException {
            HttpServletRequest request = (HttpServletRequest)req;
            HttpServletResponse response = (HttpServletResponse)res;
            BodyReaderRequestWrapper requestWrapper  = new BodyReaderRequestWrapper(request);
            if(requestWrapper == null){
                filterChain.doFilter(request,response);
            }else {
                filterChain.doFilter(requestWrapper,response);
            }
        }
    
        @Override
        public void destroy() {
    
        }
    }

使用：自行测试。