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SpringMVC学习(4): HiddenHttpMethodFilter

因为浏览器form表单只支持GET请求和POST请求,而不支持DELETE、PUT请求,因此在Spring3.0中添加了一个过滤器HiddenHttpMethodFilter,可以将这些请求转为标准的http方法,使得支持GET、POST、PUT和DELETE请求。这也使得其具备了REST风格。

在web.xml文件中配置HiddenHttpMethodFilter

<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>
           

在java文件中:

package springmvc;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/springmvc")
public class HelloWorld {
	
	private static final String SUCCESS = "success";
	
	@RequestMapping(value = "/testRest/{id}", method=RequestMethod.PUT)
	public String testRestPut(@PathVariable Integer id) {
		System.out.println("testRest PUT: " + id);
		return SUCCESS;
	}
	
	@RequestMapping(value = "/testRest/{id}", method=RequestMethod.DELETE)
	public String testRestDelete(@PathVariable Integer id) {
		System.out.println("testRest DELETE: " + id);
		return SUCCESS;
	}
	
	@RequestMapping(value = "/testRest", method=RequestMethod.POST)
	public String testRest() {
		System.out.println("testRest POST");
		return SUCCESS;
	}
	
	@RequestMapping(value = "/testRest/{id}", method=RequestMethod.GET)
	public String testRest(@PathVariable("id") Integer id) {
		System.out.println("testRest GET: " + id);
		return SUCCESS;
	}
}
           

然后在index.jsp文件中使用hidden域

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>SpringMVC</title>
</head>
<body>
	
	<form action="springmvc/testRest/1" method="post">
		<input type="hidden" name="_method" value="PUT">
		<input type="submit" value="TestRest PUT">
	</form>
	<br><br>

	<form action="springmvc/testRest/1" method="post">
		<input type="hidden" name="_method" value="DELETE">
		<input type="submit" value="TestRest DELETE">
	</form>
	<br><br>

	<form action="springmvc/testRest" method="post">
		<input type="submit" value="TestRest POST">
	</form>
	<br><br>

	<a href="springmvc/testRest/1" target="_blank" rel="external nofollow" >Test Rest Get</a>
	<br><br>

</body>
</html>
           

运行一下可以看到运行结果正常。

在这里需要注意的一点是:Tomcat应该使用7.0版本的,因为使用8.0以上的版本,Tomcat会处于对JSP文件的保护,使得PUT和DELETE方法被拒绝,从而返回一个405的错误。

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