通過HiddenHttpMethodFilter過濾器實作REST風格的CRUD

1、HiddenHttpMethodFilter過濾器的作用

浏覽器form表單隻支援GET與POST請求，而DELETE、PUT等method并不支援，Spring3.0添加了一個過濾器，可以将這些請求轉換為标準的http方法，使得支援GET、POST、PUT與DELETE請求。

2、REST風格示例

/order/1 HTTP GET：        得到 id=1的 order

/order/1 HTTP DELETE：  删除 id=1的 order

/order/1 HTTP PUT：        更新id=1的 order

/order    HTTP POST：       新增order

3、在web.xml檔案中添加過濾器HiddenHttpMethodFilter

<!-- 配置HiddenHttpMethodFilter過濾器可以把POST請求轉為DELETE或PUT請求  -->
<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>      

4、控制器TestRequestMappingController.java

package com.springmvc.web.controller;

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 TestRequestMappingController {

	@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 Integer id) {
		System.out.println("testRest GET: " + id);
		return "success";
	}
	
}
           

 5、通路代碼

<form action="<%=path%>/springmvc/testRest/1" method="post">
	<input type="hidden" name="_method" value="PUT"/>
	<input type="submit" value="Test Rest PUT" />
</form>

<form action="<%=path%>/springmvc/testRest/1" method="post">
	<input type="hidden" name="_method" value="DELETE"/>
	<input type="submit" value="Test Rest DELETE" />
</form>

<form action="<%=path%>/springmvc/testRest" method="post">
	<input type="submit" value="Test Rest POST" />
</form>

<a href="<%=path%>/springmvc/testRest/1" target="_blank" rel="external nofollow" >Test Rest GET</a>