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Tags : SpringMvc,form,PUT,DELETE发表时间: 2020-06-06 21:15:36
一、当前现状
浏览器使用form提交信息的时候只支持GET和POST,如果需要在浏览器上使用PUT和DELETE请求方式的话,只能使用欺骗的方式了,SpringMvc提供了HiddenHttpMethodFilter类来提供支持,请看代码:

public class HiddenHttpMethodFilter extends OncePerRequestFilter {

    /** Default method parameter: {@code _method} */
    //我们的隐藏字段name必须为_method
    public static final String DEFAULT_METHOD_PARAM = "_method";

    private String methodParam = DEFAULT_METHOD_PARAM;


    /**
     * Set the parameter name to look for HTTP methods.
     * @see #DEFAULT_METHOD_PARAM
     */
    public void setMethodParam(String methodParam) {
        Assert.hasText(methodParam, "'methodParam' must not be empty");
        this.methodParam = methodParam;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {

        HttpServletRequest requestToUse = request;

        if ("POST".equals(request.getMethod()) && request.getAttribute(WebUtils.ERROR_EXCEPTION_ATTRIBUTE) == null) {
            String paramValue = request.getParameter(this.methodParam);
            if (StringUtils.hasLength(paramValue)) {
                requestToUse = new HttpMethodRequestWrapper(request, paramValue);
            }
        }

        filterChain.doFilter(requestToUse, response);
    }


    /**
     * Simple {@link HttpServletRequest} wrapper that returns the supplied method for
     * {@link HttpServletRequest#getMethod()}.
     */
    private static class HttpMethodRequestWrapper extends HttpServletRequestWrapper {

        private final String method;

        public HttpMethodRequestWrapper(HttpServletRequest request, String method) {
            super(request);
            this.method = method.toUpperCase(Locale.ENGLISH);
        }
        //通过继承方式对getMethod方法做了下改变,就变成了PUT或者DELETE了
        @Override
        public String getMethod() {
            return this.method;
        }
    }

}

二、配置步骤
1. web.xml

    <!-- HTTP PUT Form -->
    <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. putform.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form method="POST" action="<%=request.getServletContext().getContextPath()%>/home/putformBody">
        <input type="hidden" name="_method" value="PUT">
        <p>姓名:</p><input type="text" name="name" /><br/>
        <p>性别:</p><input type="text" name="sex" /><br/>
        <p>年龄:</p><input type="text" name="age" /><br/>
        <button type="submit">提交</button>
    </form>
</body>
</html>

3. putformBody(controller方法)

@RequestMapping(path="home/putformBody", method=RequestMethod.PUT, produces = "text/plain;charset=utf-8")
    @ResponseBody
    public String putformBody(HttpServletRequest req, HttpServletResponse resp) {
        String name = req.getParameter("name");
        String sex = req.getParameter("sex");
        String age = req.getParameter("age");
        return "name:" + name + ",sex:" + sex + ",age:" + age;
    }
四、中间遇到的坑
1、拦截器的url-pattern必须配置为/*,不能配置/,否则不生效;
2、为对中文支持避免乱码配置CharacterEncodingFilter必须为放在第一个,否则即使是配置生效(断点调试能进去),但是依然中文乱码,初学的朋友参考web.xml如下:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <description>cockroach-springmvc-xml</description>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:applicationContext.xml</param-value>
    </context-param>

    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/springmvc-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!-- UTF-8 encoding -->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!-- HTTP PUT Form -->
    <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>
</web-app>

3、SpringMvc以@ResponseBody返回的时中文乱码,demo学习的话可以配置下@RequestMapping如下:

@RequestMapping(path="home/putformBody", method=RequestMethod.PUT, produces = "text/plain;charset=utf-8")


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