from表单提交DELETE请求

谁践踏了优雅 2022-05-21 01:05 284阅读 0赞

## 1.在web.xml中配置过滤器 ##

<filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

## 2.在表单中发送POST请求 ##

method=”post”

添加隐藏域(name=”\_method” value=”PUT/DELETE”) //name的名字，原因看源码分析

## 3.配置支持对应请求方式 ##

@RequestMapping(method = RequestMethod.DELETE)

源码分析：

public class HiddenHttpMethodFilter extends OncePerRequestFilter {
        public static final String DEFAULT_METHOD_PARAM = "_method";
        private String methodParam = "_method";
    
        public HiddenHttpMethodFilter() {
        }
    
        public void setMethodParam(String methodParam) {
            Assert.hasText(methodParam, "'methodParam' must not be empty");
            this.methodParam = methodParam;
        }
    
        protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
            HttpServletRequest requestToUse = request;
            if ("POST".equals(request.getMethod()) && request.getAttribute("javax.servlet.error.exception") == null) {
               String paramValue = request.getParameter(this.methodParam);
                if (StringUtils.hasLength(paramValue)) {
                    requestToUse = new HiddenHttpMethodFilter.HttpMethodRequestWrapper(request, paramValue);
                }
            }
    
            filterChain.doFilter((ServletRequest)requestToUse, response);
        }
    
        private static class HttpMethodRequestWrapper extends HttpServletRequestWrapper {
            private final String method;
    
            public HttpMethodRequestWrapper(HttpServletRequest request, String method) {
                super(request);
                this.method = method.toUpperCase(Locale.ENGLISH);
            }
    
            public String getMethod() {
                return this.method;
            }
        }
    }